Datasheet XCL205, XCL206, XCL207 Datasheet (TOREX)

)

(

)

)

V

XCL205/XCL206/XCL207

Series

ETR2801-010

Inductor Built-in Step-Down “micro DC/DC” Converters

☆GreenOperation Compatible

■GENERAL DESCRIPTION

The XCL205/XCL206/XCL207 series is a synchronous step-down micro DC/DC converter which integrates an inductor and a
control IC in one tiny package (2.5mm×2.0mm, H=1.0mm). A stable power supply with an output current of 600mA is
configured using only two capacitors connected externally.
Operating voltage range is from 2.0V to 6.0V

4.0V in increments of 0.05V. The device is operated by 3.0MHz, and includes 0.42ΩP-channel driver transistor and 0.52Ω
N-channel switching transistor. As for operation mode, the XCL205 series is PWM control, the XCL206 series is automatic
PWM/PFM switching control and the XCL207 series can be manually switched between the PWM control mode and the
automatic PWM/PFM switching control mode, allowing fast response, low ripple and high efficiency over the full range of loads
(from light load to heavy load). During stand-by, the device is shutdown to reduce current consumption to as low as 1.0μA or
less. With the built-in UVLO (Under Voltage Lock Out) function, the internal driver transistor is forced OFF when input voltage
becomes 1.4V or lower. XCL205B(G)/XCL206B(G)/XCL207B(G) series provide short-time turn-on by the soft start function
internally set in 0.25 ms (TYP). XCL205B(C,G) /XCL206 B(C,G) / XCL207B(C,G) integrate C
enables the electric charge stored at the output capacitor CL to be discharged via the internal auto-discharge switch located
between the L
of this function.

■APPLICATIONS

●Mobile phones, Smart phones

●Bluetooth Headsets

●WiMAX PDAs, MIDs, UMPCs

●Portable game consoles

●Digital cameras, Camcorders

●Electronic dictionaries

■TYPICAL APPLICATION CIRCUIT

and VSS pins. When the devices enter stand-by mode, output voltage quickly returns to the VSS level as a result

X

XCL205/206/207 Series

L1

(XCL20xG:1.8V～6.0V). Output voltage is internally set in a range from 0.8V to

auto discharge function which

L

■FEATURES

Ultra Small : 2.5mm×2.0mm, H=1.0mm

Input Voltage : 2.0V ~ 6.0V(A/B/C Type)

1.8V ~ 6.0V(G Type)

Output Voltage : 0.8V ~ 4.0V (+2.0%)

High Efficiency : 90% (VIN=4.2V, V

OUT

=3.3V)

Output Current : 600mA

Oscillation Frequency : 3.0MHz (+15%)

Maximum Duty Cycle
Capacitor
CE Function

Protection Circuits

: 100%
: Low ESR Ceramic
: Active High
Soft-Start Circuit Built-In

C

High Speed Auto Discharge

L

:Current Limiter Circuit Built-In

(Constant Current & Latching)

Control Methods : PWM (XCL205)

PWM/PFM Auto (XCL206)

PWM/PFM Manual (XCL207)

Operating Ambient Temperature
Environmentally Friendly

: -40℃～+85℃
: EU RoHS Compliant, Pb Free

■TYPICAL PERFORMANCE

CHARACTERISTICS

XCL205A333xx/XCL206A333xx/XCL207A333xx

100

XCL206/XCL207(PWM /PF M

L

X

CL

10μF

600mA

* “L1 and L

”, and “L2 and V

X

ss

V

OUT

(TOP VIEW)

VIN

Vss

CE/MODE

L2

” is connected by wiring.

OUT

CIN

4.7μF

80

60

VIN= 5.5V

5.0V

40

4.2V

Efficency:EFF I( %

20

0

0.1 1 10 100 1000

Output Current:I

XCL205/XCL207

PWM

(mA)

OUT

VOUT=3.3V

1/25

XCL205/XCL206/XCL207

Series

■PIN CONFIGURATION

L1

7

1

6

V

IN

5

V

ss

CE/MODE

4

8

L2

(BOTTOM VIEW)

Lx

2 V ss

3 V

OUT

* It should be connected the V

* If the dissipation pad needs to be connected to other pins, it should be

connected to the GND pin.

* Please refer to pattern layout page for the connecting to PCB.

SS pin (No. 2 and 5) to the GND pin.

■PIN ASSIGNMENT

PIN NUMBER PIN NAME

1 Lx Switching Output

2,5 VSS Ground

3 V

Output Voltage

OUT

4 CE / MODE Chip Enable & Mode Switch
6 VIN Power Input
7 L1
8 L2

FUNCTION

Inductor Electrodes

■PRODUCT CLASSIFICATION

●Ordering Information

XCL205①②③④⑤⑥-⑦
XCL206①②③④⑤⑥-⑦
XCL207①②③④⑤⑥-⑦

DESIGNATOR ITEM SYMBOL DESCRIPTION

①

②③

④ Oscillation Frequency

(*1)

⑤⑥-⑦

(*1)

The “-G” suffix indicates that the products are Halogen and Antimony free as well as being fully RoHS compliant.

(*2)

When other output voltages are needed, please contact your local Torex sales office for more information.

Output voltage range is 0.8~4.0V.

(*1)

Fixed PWM control

(*1)

PWM / PFM automatic switching control

(*1)

Manual Mode Selection Pin (Semi-custom)

Functions selection
(All CE active high)

A
B
C
G

VIN≧2.0V, No C

VIN≧2.0V, C

VIN≧2.0V, C

VIN≧1.8V, C

10 1.0V
12 1.2V
14 1.4V
15 1.5V

1K 1.75V

Output Voltage

(*2)

18 1.8V
19 1.9V
25 2.5V
28 2.8V
2L 2.85V
30 3.0V
33 3.3V

3 3.0MHz

Package

(Order Unit)

AR-G CL-2025 (3,000/Reel)

auto discharge, Standard soft-start

L

auto discharge, High speed soft-start

L

auto discharge, Standard soft-start

L

auto discharge, High speed soft-start

L

2/25

XCL205/XCL206/XCL207

■BLOCK DIAGRAM

●XCL205 / XCL206 / XCL207 series A Type

L2 L1

VOUT

VIN

CFB

R2

Error Amp.

FB

R1

VSHORT

Vref with
Soft Start,
CE

V

SS

UVLO

R3

R4

NOTE: The XCL205 offers a fixed PWM control, a signal from CE/MODE Control Logic to PWM/PFM Selector is fixed to "L" level inside.

The XCL206 control scheme is PWM/PFM automatic switching, a signal from CE/MODE Control Logic to PWM/PFM Selector is fixed to

"H" level inside. The diodes placed inside are ESD protection diodes and parasitic diodes.

●XCL205 / XCL206 / XCL207 / XCL205 / XCL206 / XCL207 series B/C/G Type

L2 L1

VOUT

VIN

CFB

R2

Error Amp.

FB

R1

Vref with
Soft Start,
CE

V

SS

UVLO

R3

R4

NOTE: The XCL205 offers a fixed PWM control, a signal from CE/MODE Control Logic to PWM/PFM Selector is fixed to "L" level inside.

The XCL206 control scheme is PWM/PFM automatic switching, a signal from CE/MODE Control Logic to PWM/PFM Selector is fixed to

"H" level inside. The diodes placed inside are ESD protection diodes and parasitic diodes.

Phase
Compensation

VSHORT

PWM/PFM
Selector

UVLO Cmp

Phase
Compensation

PWM/PFM
Selector

UVLO Cmp

Inductor

PWM
Comparator

Inductor

PWM
Comparator

Current Feedback
Current Limit

Logic

Synch
Buffer
Drive

Ramp Wave
Generator
OSC

CE/MODE
Control
Logic

Current Feedback
Current Limit

Logic

Synch
Buffer
Drive

Ramp Wave
Generator
OSC

CE/MODE
Control
Logic

Lx

VSS

CE/MODE

Lx

VSS

CE/

CE/MODE

Series

■ABSOLUTE MAXIMUM RATINGS

PAR AMETER SYMBOL RATINGS UNITS

VIN Pin Voltage VIN V

LX Pin Voltage VLX V

V

Pin Voltage V

OUT

V

OUT

CE/MODE Pin Voltage VCE V

LX Pin Current ILX ±1500 mA

Power Dissipation Pd 1000*1 mW

Operating Ambient Temperature Topr - 40 ~ + 85 ℃

Storage Temperature Tstg - 40 ~ + 105 ℃

*1: The power dissipation figure shown is PCB mounted (40mm×40mm, t=1.6mm, Glass Epoxy FR-4).

Please refer to page 16 for details.

- 0.3 ~VSS +6.5 V

SS

- 0.3 ~ VIN + 0.3≦VSS+6.5 V

SS

- 0.3 ~VSS +6.5 V

SS

- 0.3 ~VSS +6.5 V

SS

Ta = 2 5℃

3/25

XCL205/XCL206/XCL207

Series

■ELECTRICAL CHARACTERISTICS

●XCL205Axx3AR/XCL206Axx3AR/XCL207Axx3AR, f

PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNITS

Output Voltage V

OUT

When connected to external components,
V

=5.0V, I

IN=VCE

Operating Voltage Range VIN 2.0 - 6.0 V ①

V

Maximum Output Current I

UVLO Voltage V

Supply Current (XCL205) - 46 65

Supply Current (XCL206, XCL207)

Stand-by Current I

Oscillation Frequency f

(*12)

(*12)

PFM Switching Current

PFM Duty Limit

Maximum Duty Cycle

Minimum Duty Cycle

Efficiency

(*2)

Lx SW "H" ON Resistance 1 R
Lx SW "H" ON Resistance 2 R

Lx SW "L" ON Resistance 1 R
Lx SW "L" ON Resistance 2 R

Lx SW "H" Leakage Current

Lx SW "L" Leakage Current

Current Limit

(*10)

I

Output Voltage

Temperature Characteristics

CE "H" Voltage V

CE "L" Voltage V

PWM "H" Level Voltage

(*13)

OUTMAX

UVLO

IDD V

STB

OSC

I

PFM

DTY

LIMIT_PFM

D

MAX

D

MIN

EFFI

LｘH

LｘH

LｘL

(*5)

(*5)

V

LｘL

I

LEAKH

I

LEAKL

LIM

△

V

OUT

(V

・△

OUT

CEH

CEL

PWMH

VIN=VCE=5.0V, V

VIN=5.0V, VCE=0V, V

To pr )

IN=VOUT(T)

When connected to external components

V

CE=VIN,VOUT

Voltage which Lx pin holding “L” level

=5.0V, V

IN=VCE

When connected to external components,
V

IN=VOUT(T)

When connected to external components,
V

IN=VOUT(T)

= VIN= V

V

CE

=5.0V, V

V

IN=VCE

V

IN=VCE

=5.0V, V

When connected to external components,
V

CE=VIN＝VOUT (T)

VIN=VCE=5.0V, V
VIN=VCE=3.6V, V
VIN=VCE=5.0V
VIN=VCE=3.6V,

VIN=V
VIN=V

I

/

-40℃≦Topr≦85℃
V
Voltage changes Lx to “H” level
V
Voltage changes Lx to “L” level

=5.0V, VCE=0V, LX=0V - 0.01 1.0 μA ⑤

OUT

=5.0V, VCE=0V, LX= 5.0V - 0.01 1.0 μA ⑤

OUT

=30mA

OUT

=0V, Applied voltage to VCE,

OUT

=0V, Applied voltage to VCE,

OUT

When connected to external components,
I

=1mA

OUT

frequency becomes 2550kHz≦f

PWM "L" Level Voltage

(*13)

V

PWML

When connected to external components,
I

=1mA

OUT

frequency becomes f
CE "H" Current I
CE "L" Current I

Soft Start Time tSS

Latch Time t

Short Protection

Threshold Voltage

VIN=VCE=5.0V, V

CEH

VIN=5.0V, VCE=0V, V

CEL

When connected to external components,

V

=0V→VIN , I

CE

V

=

VCE=5.0V,

LAT

IN

Short Lx at 1Ω resistance

Sweeping V

V

SHORT

1Ω resistance, V

level within 1ms

Inductance Value L Test frequency=1MHz - 1.5 - μH

Allowed Inductor Current IDC ΔT=40℃ - 1000 - mA

Test conditions: Unless otherwise stated, VIN=5.0V, VOUT(T)=Nominal Voltage
NOTE:

*1: Including hysteresis operating voltage range.
*2: EFFI = { ( output voltage×output current ) / ( input voltage×input current) }×100

*3: ON resistance (Ω)= (V
*4: Design value
*5: When temperature is high, a current of approximately 10μA (maximum) may leak.

*6: The CE/MODE pin of the XCL207 series works also as an external switching pin of PWM control and PWM/PFM control. When the IC is in the

operation, control is switched to the automatic PWM/PFM switching mode when the CE/MODE pin voltage is equal to or greater than VIN minus

0.3V, and to the PWM mode when the CE/MODE pin voltage is equal to or lower than VIN minus 1.0V and equal to or greater than VCEH.

*7: Time until it short-circuits VOUT with GND via 1Ωof resistor from an operational state and is set to Lx=0V from current limit pulse generating.
*8: When VIN is less than 2.4V, limit current may not be reached because voltage falls caused by ON resistance.
*9: When the difference between the input and the output is small, some cycles may be skipped completely before current maximizes.

If current is further pulled from this state, output voltage will decrease because of P-ch driver ON resistance.
*10: Current limit denotes the level of detection at peak of coil current.
*11: “H”=V

IN~VIN-1.2V, “L”=+0.1V~-0.1V

*12: IPFM and DTY
*13: VPWMH and VPWML are defined only for the XCL207 series. (They are not used in the XCL205/and XCL206 series)

IN - Lx pin measurement voltage) / 100mA

are defined only for the XCL206 and XCL207 series which have PFM control function. (Not for the XCL 205 series)

LIMIT_PFM

4/25

=3.0MHz, Ta=25℃

OSC

=30mA

OUT

+2.0V, VCE=1.0V

=0V,

OUT=VOUT(T)

OUT=VOUT(T)

+2.0V,VCE=1.0V, I

+2.0V, VCE=VIN , I

+1.0V, I

OUT(T)

(*4)

(*4)

OUT

OUT=VOUT (T)

OUT=VOUT (T)

+1.2V, I

OUT

=0V, ILX=100mA

OUT

=0V, ILX=100mA

OUT

- 0.45 0.66 Ω -

- 0.52 0.77 Ω -

OUT=VOUT(T)

(*9)

(*1, *11)

×1.1V

×1.1V - 0 1.0 μA ②

=100mA

OUT

=1mA

OUT

=1mA - 200 300 % ①

×0.9V 100 - - % ③

×1.1V - - 0 % ③

= 100mA

×0.9V

(*3)

- 0.35 0.55 Ω ④

(*3)

- 0.42 0.67 Ω ④

(*8)

900 1050 1350 mA ⑥

<E-1> <E-2> <E-3> V ①

600 - - mA ①

1.00 1.40 1.78 V ③

- 21 35

μA ②

2550 3000 3450 kHz ①

<E-4> <E-5> <E-6> mA ⑩

- <E-7> - % ①

- ±100 - ppm/ ℃ ①

(*11)

(*11)

(*6),

Voltage which oscillation

OSC

(*6)

, Voltage which oscillation

OUT

V

OUT

, VIN=VCE=5.0V, Short Lx at

OUT

＜2550kHz

OSC

=0V - 0.1 - 0.1 μA ⑤

OUT

=0V - 0.1 - 0.1 μA ⑤

OUT

=1mA

=0.8×V

voltage which Lx becomes “L”

OUT

OUT

(*7)

(T)

≦3450kHz

(*13)

0.65 - V

V

- 0.25 V ③

SS

(*13)

- - VIN - 1.0 V ①

V

-

IN

0.25

- - V ①

0.5 0.9 2.5 ms ①

1.0 - 20 ms ⑦

<E-8> <E-9> <E-10> V ⑦

V ③

IN

CIRCUIT

■ELECTRICAL CHARACTERISTICS (Continued)

●XCL205Bxx3AR/XCL206Bxx3AR/XCL207Bxx3AR, f

=3.0MHz, Ta=25℃

OSC

XCL205/XCL206/XCL207

Series

PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNITS

Output Voltage

Operating Voltage Range

Maximum Output Current

UVLO Voltage

Supply Current (XCL205) - 46 65

Supply Current (XCL206, XCL207)

Stand-by Current

Oscillation Frequency

(*12)

(*12)

PFM Switching Current

PFM Duty Limit

Maximum Duty Cycle D

Minimum Duty Cycle D

Efficiency

(*2)

Lx SW "H" ON Resistance 1
Lx SW "H" ON Resistance 2

Lx SW "L" ON Resistance 1
Lx SW "L" ON Resistance 2

Lx SW "H" Leakage Current

Current Limit

(*10)

Output Voltage

Temperature Characteristics

CE "H" Voltage

CE "L" Voltage

PWM "H" Level Voltage

PWM "L" Level Voltage

(*13)

(*13)

CE "H" Current
CE "L" Current

Soft Start Time

Latch Time

Short Protection

Threshold Voltage

CL Discharge

Inductance Value

V

OUT

V

IN

I

OUTMAX

V

UVLO

I

DD

I

STB

f

OSC

I

PFM

DTY

LIMIT_PFM

MAX

MIN

EFFI

R

LｘH

R

LｘH

R

LｘL

R

(*5)

LｘL

I

LEAKH

I

LIM

△

V

OUT

(V

・△

OUT

V

CEH

V

CEL

V

PWMH

V

PWML

I

CEH

I

CEL

t

SS

t

LAT

V

SHORT

R

DCHG

L

Allowed Inductor Current IDC

Test conditions: Unless otherwise stated, VIN=5.0V, VOUT (T) =Nominal Voltage
NOTE:

*1: Including hysteresis operating voltage range.
*2: EFFI = { ( output voltage×output current ) / ( input voltage×input current) }×100

*3: ON resistance (Ω)= (VIN - Lx pin measurement voltage) / 100mA
*4: Design value
*5: When temperature is high, a current of approximately 10μA (maximum) may leak.

*6: The CE/MODE pin of the XCL207 series works also as an external switching pin of PWM control and PWM/PFM control. When the IC is in the

operation, control is switched to the automatic PWM/PFM switching mode when the CE/MODE pin voltage is equal to or greater than VIN minus

0.3V, and to the PWM mode when the CE/MODE pin voltage is equal to or lower than VIN minus 1.0V and equal to or greater than VCEH.

*7: Time until it short-circuits VOUT with GND via 1Ωof resistor from an operational state and is set to Lx=0V from current limit pulse generating.
*8: When VIN is less than 2.4V, limit current may not be reached because voltage falls caused by ON resistance.
*9: When the difference between the input and the output is small, some cycles may be skipped completely before current maximizes.

If current is further pulled from this state, output voltage will decrease because of P-ch driver ON resistance.
*10: Current limit denotes the level of detection at peak of coil current.
*11: “H”=VIN~VIN-1.2V, “L”=+0.1V~-0.1V

*12: IPFM and DTY
*13: VPWMH and VPWML are defined only for the XCL207 series. (They are not used in the XCL205/and XCL206 series)

are defined only for the XCL206 and XCL207 series which have PFM control function. (Not for the XCL 205 series)

LIMIT_PFM

When connected to external components,
V

=5.0V, I

IN=VCE

V

IN=VOUT(T)

When connected to external components
V

CE=VIN,VOUT

Voltage which Lx pin holding “L” level

V

=5.0V, V

IN=VCE

V

=5.0V, VCE=0V, V

IN

When connected to external components,
V

=V

IN

OUT(T)

When connected to external components,
V

=V

IN

OUT(T)

V

= V

CE=VIN

V

=5.0V, V

IN=VCE

V

=5.0V, V

IN=VCE

=30mA

OUT

+2.0V, VCE=1.0V

=0V,

OUT=VOUT(T)

OUT=VOUT(T)

+2.0V,VCE=1.0V, I

+2.0V, VCE = VIN , I

+1.0V, I

OUT(T)

OUT

OUT=VOUT (T)

OUT=VOUT (T)

When connected to external components,
V

CE=VIN＝VOUT (T)

V

/

To p r)

=5.0V, V

IN=VCE

V

=3.6V, V

IN=VCE

V

=5.0V

IN=VCE

V

= 3.6V

IN=VCE

V

IN=VOUT

V

=5.0V, V

IN=VCE

I

=30mA

OUT

-40℃≦Topr≦85℃
V

=0V, Applied voltage to VCE,

OUT

Voltage changes Lx to “H” level
V

=0V, Applied voltage to VCE,

OUT

Voltage changes Lx to “L” level
When connected to external components,
I

=1mA

OUT

frequency becomes 2550kHz≦f
When connected to external components,
I

=1mA

OUT

frequency becomes f
V

=5.0V, V

IN=VCE

V

=5.0V, VCE=0V, V

IN

When connected to external components,
V

=0V→VIN , I

CE

V

=5.0V, V

IN=VCE

Short Lx at 1Ω resistance
Sweeping V
1Ω resistance, V
level within 1ms

V

=5.0V, LX=5.0V, VCE=0V, V

IN

+1.2V, I

OUT

=0V, ILX=100mA

OUT

=0V, ILX=100mA

OUT

(*4)

(*4)

=5.0V, VCE =0V, LX=0V

OUT=VOUT (T)

(*6),

Voltage which oscillation

(*6)

, Voltage which oscillation

OUT

, VIN=VCE=5.0V, Short Lx at

OUT

＜2550kHz

OSC

=0V

OUT

=0V

OUT

=1mA

=0.8×V

OUT

voltage which Lx becomes “L”

OUT

Test frequency =1MHz

ΔT=40℃

×1.1V

×1.1V

=100mA

OUT

=1mA

OUT

=1mA

×0.9V
×1.1V

=100mA

×0.9V

(*11)

(*11)

OSC

OUT(T)

(*7)

=Open

OUT

(*9)

(*1, *11)

(*3)

(*3)

(*8)

≦3450kHz

(*13)

<E-1> <E-2> <E-3> V ①

2.0 - 6.0 V ①

600 - - mA ①

1.00 1.40 1.78 V ③

- 21 35

μA ②

- 0 1.0 μA ②

2550 3000 3450 kHz ①

<E-4> <E-5> <E-6> mA ⑩

- 200 300 % ①

100 - - % ③

- - 0 % ③

- <E-7> - % ①

- 0.35 0.55 Ω ④

- 0.42 0.67 Ω ④

- 0.45 0.66 Ω -

- 0.52 0.77 Ω -

- 0.01 1.0 μA ⑨

900 1050 1350 mA ⑥

- ±100 - ppm/ ℃ ①

0.65 - V

V

SS

(*13)

- - VIN - 1.0 V ①

V

IN

0.25

- 0.25 V ③

-

- - V ①

V ③

IN

- 0.1 - 0.1 μA ⑤

- 0.1 - 0.1 μA ⑤

- <E-11> <E-12> ms ①

1.0 - 20 ms ⑦

<E-8> <E-9> <E-10> V ⑦

200 300 450 Ω ⑧

- 1.5 - μH

- 1000 - mA

CIRCUIT

5/25

XCL205/XCL206/XCL207

Series

■ELECTRICAL CHARACTERISTICS (Continued)

●XCL205Cxx3AR/XCL206Cxx3AR/XCL207Cxx3AR, f

PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNITS

Output Voltage V

Operating Voltage Range

Maximum Output Current

UVLO Voltage V

Supply Current (XCL205) - 46 65

Supply Current (XCL206, XCL207)

Stand-by Current I

Oscillation Frequency

PFM Switching Current

PFM Duty Limit

(*12)

(*12)

DTY

OUT

V

IN

I

OUTMAX

UVLO

I

DD

STB

f

OSC

I

PFM

LIMIT_PFM

Maximum Duty Cycle MAXDTY VIN = VCE =5.0V, V

Minimum Duty Cycle MINDTY VIN = VCE =5.0V, V

Efficiency

Lx SW "H" ON Resistance 1
Lx SW "H" ON Resistance 2
Lx SW "L" ON Resistance 1
Lx SW "L" ON Resistance 2

Lx SW "H" Leakage Current

Current Limit

Output Voltage

Temperature Characteristics

CE "H" Voltage V

CE "L" Voltage V

PWM "H" Level Voltage

PWM "H" Level Voltage

CE "H" Current I

CE "L" Current I

Soft Start Time

Latch Time

Short Protection

Threshold Voltage

CL Discharge

Inductance Value

(*2)

EFFI

R

LｘH

R

LｘH

R

LｘL

R

I

LEAKH

△

(V

・△

OUT

V

V

V

R

LｘL

LIM

V

OUT

CEH

CEL

PWMH

PWML

CEH

CEL

t

SS

t

LAT

SHORT

DCHG

(*5)

(*10)

I

(*13)

(*13)

L Test frequency=1MHz - 1.5 - μH-

Allowed Inductor Current IDC

Test conditions: Unless otherwise stated, VIN=5.0V, VOUT (T) = Nominal Voltage
NOTE:

*1: Including hysteresis operating voltage range.
*2: EFFI = { ( output voltage×output current ) / ( input voltage×input current) }×100

*3: ON resistance (Ω)= (VIN - Lx pin measurement voltage) / 100mA
*4: Design value
*5: When temperature is high, a current of approximately 10μA (maximum) may leak.

*6: The CE/MODE pin of the XCL207 series works also as an external switching pin of PWM control and PWM/PFM control. When the IC is in the

operation, control is switched to the automatic PWM/PFM switching mode when the CE/MODE pin voltage is equal to or greater than VIN minus

0.3V, and to the PWM mode when the CE/MODE pin voltage is equal to or lower than VIN minus 1.0V and equal to or greater than VCEH.
*7: Time until it short-circuits V
*8: When V
*9: When the difference between the input and the output is small, some cycles may be skipped completely before current maximizes.

*10: Current limit denotes the level of detection at peak of coil current.

IN is less than 2.4V, limit current may not be reached because voltage falls caused by ON resistance.

If current is further pulled from this state, output voltage will decrease because of P-ch driver ON resistance.

OUT with GND via 1Ωof resistor from an operational state and is set to Lx=0V from current limit pulse generating.

*11: “H”=VIN~VIN-1.2V, “L”=+0.1V~-0.1V
*12: IPFM and DTY

*13: VPWMH and VPWML are defined only for the XCL207 series. (They are not used in the XCL205/and XCL206 series)

are defined only for the XCL206 and XCL207 series which have PFM control function. (Not for the XCL 205 series)

LIMIT_PFM

When connected to external components,
V

= VCE =5.0V, I

IN

2.0 - 6.0 V ①

V

IN=VOUT(T)

When connected to external components
V

CE=VIN,VOUT

Voltage which Lx pin holding “L” level

V

V

IN

IN

When connected to external components,
V

IN

When connected to external components,
V

IN

+2.0V, VCE=1.0V

=VCE=5.0V, V

=5.0V, VCE=0V, V

=V

+2.0V,VCE=1.0V, I

OUT(T)

=V

+2.0V, VCE = VIN , I

OUT(T)

VCE= VIN = V

When connected to external components,
V

= VIN ＝ V

CE

VIN = VCE = 5.0V, V
VIN = VCE = 3.6V, V
VIN = VCE = 5.0V
VIN = VCE = 3.6V

VIN= V

V

I

/

OUT

Topr)

-40℃≦Topr≦85℃
V
Voltage changes Lx to “H” level
V
Voltage changes Lx to “L” level
When connected to external components,
I

OUT

=5.0V, VCE =0V, LX=0V - 0.01 1.0 μA ⑨

OUT

= VCE= 5.0V, V

IN

=30mA

=0V, Applied voltage to VCE,

OUT

=0V, Applied voltage to VCE,

OUT

(*6),

=1mA

frequency becomes 2550kHz≦f
When connected to external components,
I

OUT

=1mA

(*6)

frequency becomes f
VIN = VCE =5.0V, V
V

=5.0V, VCE = 0V, V

IN

When connected to external components,

V

=0V→VIN , I

CE

V

=5.0V, V

IN=VCE

Short Lx at 1Ω resistance

Sweeping V

1Ω resistance, V

level within 1ms

VIN = 5.0V LX = 5.0V VCE = 0V V

Δ

T=40℃

=3.0MHz, Ta=25℃

OSC

=30mA

OUT

=0V,

= V

OUT

OUT(T)

= V

OUT

+1.0V, I

OUT(T)

OUT (T)

OUT

= V

OUT

OUT (T)

= V

OUT

OUT (T)

+1.2V, I

= 0V,ILX = 100mA

OUT

= 0V,ILX = 100mA

OUT

(*4)

- 0.45 0.66 Ω -

(*4)

- 0.52 0.77 Ω -

= V

OUT

OUT (T)

(*9)

(*1, *11)

×1.1V

×1.1V - 0 1.0 μA ②

OUT(T)

=100mA

OUT

=1mA

OUT

=1mA - 200 300 % ①

×0.9V 100 - - % ③
×1.1V - - 0 % ③

= 100mA

OUT

×0.9V

(*3)

- 0.35 0.55 Ω ④

(*3)

- 0.42 0.67 Ω ④

(*8)

900 1050 1350 mA ⑥

<E-1> <E-2> <E-3> V ①

600 - - mA ①

1.00 1.40 1.78 V ③

21 35

μA ②

2550 3000 3450 kHz ①

<E-4> <E-5> <E-6> mA ⑩

- <E-7> - % ①

- ±100 - ppm/ ℃ ①

(*11)

(*11)

Voltage which oscillation

≦3450kHz

OSC

, Voltage which oscillation

＜2550kHz

OSC

= 0V - 0.1 - 0.1 μA ⑤

OUT

= 0V - 0.1 - 0.1 μA ⑤

OUT

=1mA

OUT

=0.8×V

OUT

, VIN=VCE=5.0V, Short Lx at

OUT

OUT

(*7)

voltage which Lx becomes “L”

(*13)

OUT(T)

0.65 - 6.0 V ③

- 0.25 V ③

V

SS

(*13)

- - VIN - 1.0 V ①

V

-

IN

0.25

- - V ①

0.5 0.9 2.5 ms ①

1.0 - 20 ms ⑦

<E-8> <E-9> <E-10> V ⑦

= open 200 300 450 Ω ⑧

OUT

- 1000 - mA -

CIRCUIT

6/25

XCL205/XCL206/XCL207

■ELECTRICAL CHARACTERISTICS (Continued)

●XCL205Gxx3AR/XCL206Gxx3AR/XCL207Gxx3AR, f

PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNITS

Output Voltage V

Operating Voltage Range

Maximum Output Current

UVLO Voltage V

Supply Current (XCL205) - 46 65

Supply Current (XCL206, XCL207)

Stand-by Current I

Oscillation Frequency

PFM Switching Current

PFM Duty Limit

(*12)

(*12)

DTY

OUT

V

IN

I

OUTMAX

UVLO

I

DD

STB

f

OSC

I

PFM

LIMIT_PFM

Maximum Duty Cycle MAXDTY VIN = VCE =5.0V, V

Minimum Duty Cycle MINDTY VIN = VCE =5.0V, V

Efficiency

Lx SW "H" ON Resistance 1
Lx SW "H" ON Resistance 2

Lx SW "L" ON Resistance 1
Lx SW "L" ON Resistance 2

Lx SW "H" Leakage Current

Current Limit

Output Voltage

Temperature Characteristics

CE "H" Voltage V

CE "L" Voltage V

PWM "H" Level Voltage

PWM "H" Level Voltage

CE "H" Current I
CE "L" Current I

Soft Start Time

Latch Time

Short Protection

Threshold Voltage

CL Discharge

Inductance Value

(*2)

EFFI

R

LｘH

R

LｘH

R

LｘL

R

I

△

(V

OUT

V

V

V

R

LｘL

LEAKH

LIM

V

OUT

・△

CEH

CEL

PWMH

PWML

CEH

CEL

t

SS

t

LAT

SHORT

DCHG

(*5)

(*10)

I

(*13)

(*13)

L Test frequency=1MHz - 1.5 - μH-

Allowed Inductor Current IDC

Test conditions: Unless otherwise stated, VIN=5.0V, VOUT (T) = Nominal Voltage
NOTE:

*1: Including hysteresis operating voltage range.
*2: EFFI = { ( output voltage×output current ) / ( input voltage×input current) }×100

*3: ON resistance (Ω)= (VIN - Lx pin measurement voltage) / 100mA
*4: Design value
*5: When temperature is high, a current of approximately 10μA (maximum) may leak.

*6: The CE/MODE pin of the XCL207 series works also as an external switching pin of PWM control and PWM/PFM control. When the IC is in the

operation, control is switched to the automatic PWM/PFM switching mode when the CE/MODE pin voltage is equal to or greater than V

0.3V, and to the PWM mode when the CE/MODE pin voltage is equal to or lower than V

*7: Time until it short-circuits VOUT with GND via 1Ωof resistor from an operational state and is set to Lx=0V from current limit pulse generating.
*8: When V
*9: When the difference between the input and the output is small, some cycles may be skipped completely before current maximizes.

*10: Current limit denotes the level of detection at peak of coil current.
*11: “H”=V

*12: IPFM and DTY
*13: VPWMH and VPWML are defined only for the XCL207 series. (They are not used in the XCL205/and XCL206 series)
*14: VIN is applied when VOUT (T) x 0.5V becomes more than VIN.

IN is less than 2.4V, limit current may not be reached because voltage falls caused by ON resistance.

If current is further pulled from this state, output voltage will decrease because of P-ch driver ON resistance.

IN~VIN-1.2V, “L”=+0.1V~-0.1V

are defined only for the XCL206 and XCL207 series which have PFM control function. (Not for the XCL 205 series)

LIMIT_PFM

When connected to external components,

V

= VCE =5.0V, I

IN

1.8 - 6.0 V ①

V

IN=VOUT(T)

When connected to external components

V

CE=VIN,VOUT(T)

Voltage which Lx pin holding “L” level

V

IN

+2.0V, VCE=1.0V

=VCE=5.0V, V

VIN =5.0V, VCE=0V, V

When connected to external components,

=V

V

IN

+2.0V,VCE=1.0V, I

OUT(T)

When connected to external components,

=V

V

IN

+2.0V, VCE = VIN , I

OUT(T)

VCE= VIN = V

When connected to external components,

V

= VIN ＝ V

CE

VIN = VCE = 5.0V, V
VIN = VCE = 3.6V, V
VIN = VCE = 5.0V
VIN = VCE = 3.6V

VIN= V

V

I

/

OUT

Topr)

-40℃≦Topr≦85℃

V

Voltage changes Lx to “H” level

V

Voltage changes Lx to “L” level

When connected to external components,

I

OUT

=5.0V, VCE =0V, LX=0V - 0.01 1.0 μA ⑨

OUT

= VCE= 5.0V, V

IN

=30mA

=0V, Applied voltage to VCE,

OUT

=0V, Applied voltage to VCE,

OUT

(*6),

=1mA

frequency becomes 2550kHz≦f

When connected to external components,

I

OUT

=1mA

(*6)

frequency becomes f
VIN = VCE =5.0V, V

VIN =5.0V, VCE = 0V, V

When connected to external components,

V

=0V→VIN , I

CE

V

=5.0V, V

IN=VCE

Short Lx at 1Ω resistance

Sweeping V

1Ω resistance, V

level within 1ms

VIN = 5.0V LX = 5.0V VCE = 0V V

Δ

T=40℃

=3.0MHz, Ta=25℃

OSC

=30mA

OUT

(*9)

(*14)

×0.5V

OUT(T)

OUT (T)

,

= V

OUT

+1.0V, I

OUT

OUT

OUT

OUT

(*4)

- 0.45 0.66 Ω -

(*4)

- 0.52 0.77 Ω -

OUT

×1.1V

OUT(T)

= V

OUT

= V

= V

+1.2V, I

×1.1V - 0 1.0 μA ②

OUT(T)

=100mA

OUT

=1mA

OUT

=1mA - 200 300 % ①

OUT

×0.9V 100 - - % ③

OUT (T)

×1.1V - - 0 % ③

OUT (T)

= 100mA

OUT

= 0V,ILX = 100mA
= 0V,ILX = 100mA

= V

OUT (T)

×0.9V

(*1, *11)

(*3)

- 0.35 0.55 Ω ④

(*3)

- 0.42 0.67 Ω ④

(*8)

900 1050 1350 mA ⑥

<E-1> <E-2> <E-3> V ①

600 - - mA ①

1.00 1.40 1.78 V ③

- 21 35

μA ②

2550 3000 3450 kHz ①

<E-4> <E-5> <E-6> mA ⑩

- <E-7> - % ①

- ±100 - ppm/ ℃ ①

(*11)

(*11)

Voltage which oscillation

≦3450kHz

OSC

, Voltage which oscillation

＜2550kHz

OSC

= 0V - 0.1 - 0.1 μA ⑤

OUT

= 0V - 0.1 - 0.1 μA ⑤

OUT

=1mA

OUT

=0.8×V

OUT

, VIN=VCE=5.0V, Short Lx at

OUT

OUT

(*7)

voltage which Lx becomes “L”

(*13)

OUT(T)

0.65 - 6.0 V ③

- 0.25 V ③

V

SS

(*13)

- - VIN - 1.0 V ①

V

-

IN

0.25

- - V ①

- <E-11> <E-12> ms ①

1.0 - 20 ms ⑦

<E-8> <E-9> <E-10> V ⑦

= open 200 300 450 Ω ⑧

OUT

- 1000 - mA -

IN minus 1.0V and equal to or greater than VCEH.

Series

CIRCUIT

IN minus

7/25

XCL205/XCL206/XCL207

Series

■ELECTRICAL CHARACTERISTICS (Continued)

●Output Voltage

NOMINAL

OUTPUT

VOLTAGE

V

MIN TYP MAX

OUT(T)

1.00 0.980 1.000 1.020

1.20 1.176 1.200 1.224

1.40 1.372 1.400 1.428

1.50 1.470 1.500 1.530

1.75 1.715 1.750 1.785

1.80 1.764 1.800 1.836

1.90 1.862 1.900 1.938

2.50 2.450 2.500 2.550

2.80 2.744 2.800 2.856

2.85 2.793 2.850 2.907

3.00 2.940 3.000 3.060

3.30 3.234 3.300 3.366

<E-1> <E-2> <E-3>

V

(V)

OUT

●PFM Switching Current

NOMINAL OUTPUT

1.2V＜V

VOLTAGE

V

≦1.2Ｖ

OUT(T)

OUT(T)

1.8V≦V

≦1.75Ｖ

OUT(T)

I

(mA)

PFM

<E-4> <E-5> <E-6>

MIN TYP MAX

190 260 350

180 240 300

170 220 270

●Efficiency ●Short Protection Threshold Voltage

NOMINAL

OUTPUT

VOLTAGE

V

OUT(T)

1.00 79

1.20 82

1.40 83

1.50 84

1.75

1.80

1.90

2.50

2.80

2.85

3.00

3.30

●Soft Start Time (XCL20xB, XCL20xG)

NOMINAL OUTPUT

0.8V≦V

1.8V≦V

Efficiency(%)

XCL205/206/207

<E-7>

3.0MHz

85

86

VOLTAGE

≦1.75Ｖ

OUT(T)

≦4.0Ｖ

OUT(T)

NOMINAL

OUTPUT

VOLTAGE

V

MIN TYP MAX MIN TYP MAX

OUT(T)

1.00 0.375 0.500 0.625 0.188 0.250 0.313

1.20 0.450 0.600 0.750 0.225 0.300 0.375

1.40 0.525 0.700 0.875 0.263 0.350 0.438

1.50 0.563 0.750 0.938 0.282 0.375 0.469

1.75 0.656 0.875 1.094 0.328 0.438 0.547

1.80 0.675 0.900 1.125 0.338 0.450 0.563

1.90 0.713 0.950 1.188 0.357 0.475 0.594

2.50 0.938 1.250 1.563 0.469 0.625 0.782

2.80 1.050 1.400 1.750 0.525 0.700 0.875

2.85 1.069 1.425 1.781 0.535 0.713 0.891

3.00 1.125 1.500 1.875 0.563 0.750 0.938

3.30 1.238 1.650 2.063 0.619 0.825 1.032

tSS(ms)

<E-11> <E-12>

TYP MAX

0.25 0.4

0.32 0.5

<E-8> <E-9> <E-10> <E-8> <E-9> <E-10>

XCL205/206/207A,B,C XCL205/206/207G

V

SHORT

(V)

8/25

ss

C

C

■TYPICAL APPLICATION CIRCUIT

●XCL205/XCL206/XCL207 Series

L1

XCL205/XCL206/XCL207

Series

Lx

L

V

V

OUT

CE/MODE

L2

V

IN

Vss

IN

●External Components

IN : 10V/4.7μF (Ceramic)

C

C

: 6.3V/10μF (Ceramic)

L

NOTE

The Inductor can be used only for this DC/DC converter.

Please do not use this inductor for the other reasons.

Please use B, X5R, and X7R grades in temperature characteristics for CIN and CL capacitors.

These grade ceramic capacitors minimize capacitance-loss as a function of voltage stress.

9/25

estart

XCL205/XCL206/XCL207

Series

■OPERATIONAL DESCRIPTION

The XCL205/XCL/206/XCL207 series consists of a reference voltage source, ramp wave circuit, error amplifier, PWM
comparator, phase compensation circuit, output voltage adjustment resistors, P-channel MOSFET driver transistor, N-channel
MOSFET switching transistor for the synchronous switch, current limiter circuit, UVLO circuit with control IC, and an inductor.
(See the block diagram above.) Using the error amplifier, the voltage of the internal voltage reference source is compared with
the feedback voltage from the V
error amplifier output, to input a signal to the PWM comparator to determine the turn-on time during PWM operation. The PWM
comparator compares, in terms of voltage level, the signal from the error amplifier with the ramp wave from the ramp wave circuit,
and delivers the resulting output to the buffer driver circuit to cause the Lx pin to output a switching duty cycle. This process is
continuously performed to ensure stable output voltage. The current feedback circuit monitors the P-channel MOS driver
transistor current for each switching operation, and modulates the error amplifier output signal to provide multiple feedback
signals. This enables a stable feedback loop even when a low ESR capacitor such as a ceramic capacitor is used ensuring
stable output voltage.

<Reference Voltage Source>
The reference voltage source provides the reference voltage to ensure stable output voltage of the DC/DC converter.

<Ramp Wave Circuit>
The ramp wave circuit determines switching frequency. The frequency is fixed internally 3.0MHz. Clock pulses generated in
this circuit are used to produce ramp waveforms needed for PWM operation, and to synchronize all the internal circuits.

<Error Amplifier>
The error amplifier is designed to monitor output voltage. The amplifier compares the reference voltage with the feedback
voltage divided by the internal split resistors, R1 and R2. When a feed back voltage is lower than the reference voltage, the
output voltage of the error amplifier is increased. The gain and frequency characteristics of the error amplifier output are fixed
internally to deliver an optimized signal to the mixer.

<Current Limit>
The current limiter circuit of the XCL205/XCL206/XCL207 series monitors the current flowing through the P-channel MOS driver
transistor connected to the Lx pin, and features a combination of the current limit mode and the operation suspension mode.

① When the driver current is greater than a specific level, the current limit function operates to turn off the pulses from the Lx pin

at any given timing.

② When the driver transistor is turned off, the limiter circuit is then released from the current limit detection state.
③ At the next pulse, the driver transistor is turned on. However, the transistor is immediately turned off in the case of an over

current state.

④ When the over current state is eliminated, the IC resumes its normal operation.
The IC waits for the over current state to end by repeating the steps ① through ③. If an over current state continues for a few
milliseconds and the above three steps are repeatedly performed, the IC performs the function of latching the OFF state of the
driver transistor, and goes into operation suspension state. Once the IC is in suspension state, operations can be resumed by
either turning the IC off via the CE/MODE pin, or by restoring power to the V
complete shutdown, but a state in which pulse output is suspended; therefore, the internal circuitry remains in operation. The
current limit of the XCL205/XCL206/XCL207 series can be set at 1050mA at typical. Depending on the state of the PC Board,
latch time may become longer and latch operation may not work. In order to avoid the effect of noise, an input capacitor is
placed as close to the IC as possible.

pin through split resistors, R1 and R2. Phase compensation is performed on the resulting

OUT

Limit < # ms

Limit > # ms

pin. The suspension state does not mean a

IN

I

Lx

V

OUT

Lx

V

CE

IN

V

10/25

Current Limit LEVEL

0mA

Vss

R

XCL205/XCL206/XCL207

Series

■OPERATIONAL DESCRIPTION (Continued)

<Short-Circuit Protection>
The short-circuit protection circuit monitors the internal R1 and R2 divider voltage from the V
block diagram shown in the previous page). In case where output is accidentally shorted to the Ground and when the FB
point voltage decreases less than half of the reference voltage (Vref) and a current more than the I
transistor, the short-circuit protection quickly operates to turn off and to latch the driver transistor. In the latch state, the
operation can be resumed by either turning the IC off and on via the CE/MODE pin, or by restoring power supply to the VIN
pin.
When sharp load transient happens, a voltage drop at the V
circuit protection may operate in the voltage higher than 1/2 V

is propagated to the FB point through CFB, as a result, short

OUT

voltage.

OUT

<UVLO Circuit>
When the V
output caused by unstable operation of the internal circuitry. When the V

IN pin voltage becomes 1.4V or lower, the P-channel output driver transistor is forced OFF to prevent false pulse

pin voltage becomes 1.8V or higher, switching

IN

operation takes place. By releasing the UVLO function, the IC performs the soft start function to initiate output startup operation.
The soft start function operates even when the V

IN pin voltage falls momentarily below the UVLO operating voltage. The UVLO

circuit does not cause a complete shutdown of the IC, but causes pulse output to be suspended; therefore, the internal circuitry
remains in operation.

<PFM Switch Current>
In PFM control operation, until coil current reaches to a specified level (I
on-time (t

t

= L×IPFM / (VIN－VOUT) →IPFM①

ON

) that the P-ch MOSFET is kept on can be given by the following formula.

ON

PFM), the IC keeps the P-ch MOSFET on. In this case,

<PFM Duty Limit>
In the PFM control operation, the PFM Duty Limit (DTY

LIMIT_PFM

) is set to 200% (TYP.). Therefore, under the condition that the

duty increases (e.g. the condition that the step-down ratio is small), it’s possible for P-ch MOSFET to be turned off even when coil
current doesn’t reach to IPFM. →IPFM②

Maximum IPFM Limit

tON

pin (refer to FB point in the

OUT

flows to the driver

LIM

Lx

Lx

f

OSC

IPFM

ILx

I

①

PFM

0mA

ILx

I

PFM

②

PFM

I

0mA

11/25

XCL205/XCL206/XCL207

Series

■OPERATIONAL DESCRIPTION (Continued)

＜CL High Speed Discharge＞

The XCL205B(C,G)/ XCL206B(C,G)/ XCL207B(C,G) series can quickly discharge the electric charge at the output capacitor (C
when a low signal to the CE pin which enables a whole IC circuit put into OFF state, is inputted via the N-channel transistor
located between the L

pin and the VSS pin. When the IC is disabled, electric charge at the output capacitor (CL) is quickly

X

discharged so that it may avoid application malfunction. Discharge time of the output capacitor (CL) is set by the CL
auto-discharge resistance (R) and the output capacitor (C

). By setting time constant of a CL auto-discharge resistance value [R]

L

and an output capacitor value (CL) as τ(τ=C x R), discharge time of the output voltage after discharge via the N channel
transistor is calculated by the following formula.

V = V

OUT(T)

x e

–t/

τ

or t=τln (V

OUT(T)

/ V)
V : Output voltage after discharge
V

: Output voltage

OUT(T)

t: Discharge time,
τ: C x R

C= Capacitance of Output capacitor (CL)
R= C

auto-discharge resistance

L

Output Voltage Discharge Characteristics

100

80

R

=300Ω(TYP.)

DCHG

CL=10uF
CL=20uF
CL=50uF

)

L

60

40

20

100 = Setting Voltage Value

Output Voltage (Relative Value)

0

0 20406080100

Discharge Time ｔ(ms)

12/25

p

XCL205/XCL206/XCL207

Series

■OPERATIONAL DESCRIPTION (Continued)

<CE/MODE Pin Function>
The operation of the XCL205/XCL206/ XCL207 series will enter into the shut down mode when a low level signal is input to the

CE/MODE pin. During the shutdown mode, the current consumption of the IC becomes 0μA (TYP.), with a state of high
impedance at the Lx pin and V
input to the CE/MODE pin is a CMOS input and the sink current is 0μA (TYP.).

●XCL205/XCL206 series - Examples of how to use CE/MODE pin

OUT pin. The IC starts its operation by inputting a high level signal to the CE/MODE pin. The

V

V

DD

SW_CE

IN

R1

CE/MODE

< IC inside >

V

DD

SW_CE

R2

V

IN

CE/MODE

< IC inside >

（A） （B）

●XCL207 series - Exam

V

DD

SW_PWM/PFM

RM1

RM2

SW_CE

les of how to use CE/MODE pin

V

IN

CE/MODE

< IC inside >

V

DD

RM1

RM2

SW_PWM/PFM

SW_CE

V

IN

CE/MODE

< IC inside >

（A） （B）

Intermediate voltage can be generated by RM1 and RM2. Please set the value
of each R1, R2, RM1, RM2 from
few hundreds kΩ to few hundreds MΩ. For switches, CPU open-drain I/O
port and transistor can be used.

(A)

SW_CE

SELECTED

STATUS

ON Stand-by

OFF Operation

(B)

SW_CE

SELECTED

STATUS

ON Operation

OFF Stand-by

(A)

SW_CE SW_PWM/PFM

SELECTED

STATUS

PWM/PFM

ON *

Automatic

Switching Control

OFF ON PWM Control

OFF OFF Stand-by

(B)

SW_CE SW_PWM/PFM

SELECTED

STATUS

ON * Stand-by

OFF ON PWM Control

PWM/PFM

OFF OFF

Automatic

Switching Control

13/25

XCL205/XCL206/XCL207

Series

■OPERATIONAL DESCRIPTION (Continued)

<Soft Start>

The XCL205/XCL206/XCL207 series (A, C type) provide 0.9ms (TYP). The XCL205/XCL206/XCL207 series (B, G type)
provide 0.32ms (TYP) however, when V
reach 90% of the output nominal voltage when the CE pin is turned on.

V

CEH

0V

V

OUT

is less than 1.8V, provide 0.25ms (TYP.). Soft start time is defined as the time to

OUT

tSS

90% of setting voltage

0V

■FUNCTION CHART

CE/MODE

VOLTAGE

LEVEL

(*1)

H Level

M Level

L Level

Note on CE/MODE pin voltage level range

(*1) H level: 0.65V <

H level: V

(*2) M level: 0.65V <

(*3) L level: 0V <

(*2)

(*2)

Stand-by Stand-by Stand-by

IN

XCL205 XCL206 XCL207

Synchronous

PWM Fixed

Control

━ ━

H level < 6V (for XCL205/XCL206)

– 0.25V < H level < V

M level < VIN - 1.0V (for XCL207)

L level < 0.25V

OPERATIONAL STATES

Synchronous

PWM/PFM

Automatic Switching

(for XCL207)

IN

Synchronous

PWM/PFM

Automatic Switching

Synchronous

PWM Fixed Control

14/25

XCL205/XCL206/XCL207

Series

■NOTE ON USE

1. The XCL205/XCL206/XCL207 series is designed for use with ceramic output capacitors. If, however, the potential
difference is too large between the input voltage and the output voltage, a ceramic capacitor may fail to absorb the resulting
high switching energy and oscillation could occur on the output. If the input-output potential difference is large, connect an
electrolytic capacitor in parallel to compensate for insufficient capacitance.

2. Spike noise and ripple voltage arise in a switching regulator as with a DC/DC converter. These are greatly influenced by
external component selection, such as the coil inductance, capacitance values, and board layout of external components.
Once the design has been completed, verification with actual components should be done.

3. Depending on the input-output voltage differential, or load current, some pulses may be skipped, and the ripple voltage may
increase.

4. When the difference between V
possibility that some cycles may be skipped completely.

5. When the difference between VIN and VOUT is small, and the load current is heavy, very wide pulses will be outputted and
there is the possibility that some cycles may be skipped completely.

6. With the IC, the peak current of the coil is controlled by the current limit circuit. Since the peak current increases when
dropout voltage or load current is high, current limit starts operation, and this can lead to instability. When peak current
becomes high, please adjust the coil inductance value and fully check the circuit operation. In addition, please calculate
the peak current according to the following formula:

Ipk = (V
L: Coil Inductance Value
f

7. When the peak current which exceeds limit current flows within the specified time, the built-in P-ch driver transistor turns off.
During the time until it detects limit current and before the built-in transistor can be turned off, the current for limit current
flows; therefore, care must be taken when selecting the rating for the external components such as a coil.

8. When V

9. Depending on the state of the PC Board, latch time may become longer and latch operation may not work. In order to avoid
the effect of noise, the board should be laid out so that input capacitors are placed as close to the IC as possible.

10. Use of the IC at voltages below the recommended voltage range may lead to instability.

11. This IC should be used within the stated absolute maximum ratings in order to prevent damage to the device.

12. When the IC is used in high temperature, output voltage may increase up to input voltage level at no load because of the

leak current of the driver transistor.

13. The current limit is set to 1350mA (MAX.)

①Current flows into P-ch MOSFET to reach the current limit (I

②The current of I

③Because of no potential difference at both ends of the coil, the time rate of coil current becomes quite small.
④Lx oscillates very narrow pulses by the current limit for several ms.
⑤The circuit is latched, stopping its operation.

IN - VOUT) x OnDuty / (2 x L x f

: Oscillation Frequency

OSC

IN is less than 2.4V, limit current may not be reached because voltage falls caused by ON resistance.

current limit functions while the VOUT pin is shorted to the GND pin, when P-ch MOSFET is ON, the potential difference for
input voltage will occur at both ends of a coil. For this, the time rate of coil current becomes large. By contrast, when
N-ch MOSFET is ON, there is almost no potential difference at both ends of the coil since the V
GND pin. Consequently, the time rate of coil current becomes quite small. According to the repetition of this operation,
and the delay time of the circuit, coil current will be converged on a certain current value, exceeding the amount of current,
which is supposed to be limited originally. Even in this case, however, after the over current state continues for several
ms, the circuit will be latched. A coil should be used within the stated absolute maximum rating in order to prevent
damage to the device.

LIM or more flows since the delay time of the circuit occurs during from the detection of the current limit to

OFF of P-ch MOSFET.

IN and VOUT is large in PWM control, very narrow pulses will be outputted, and there is the

) + IOUT

OSC

at typical. However, the current of 1350mA or more may flow. In case that the

OUT pin is shorted to the

LIM).

①

②

③

Duty

④

Limit > # ms

⑤

Lx

I

LIM

ILx

15/25

XCL205/XCL206/XCL207

Series

■NOTE ON USE (Continued)

14. In order to stabilize VIN voltage level and oscillation frequency, we recommend that a by-pass capacitor (CIN) be
connected as close as possible to the VIN & VSS pins.

15. High step-down ratio and very light load may lead an intermittent oscillation when PWM mode.

16. Please use within the power dissipation range below. Please also note that the power dissipation may changed by test
conditions, the power dissipation figure shown is PCB mounted.

1.2

1.0

0.8

0.6

0.4

0.2

Maximum Power Disspation Pd (W)

0.0
0 25 50 75 100

Operating Temperature　Ta (℃)

the power loss of micro DC/DC according to the following formula:

power loss = V

V

：Output Voltage (V)

OUT

I

：Output Current (A)

OUT

OUT×IOUT

×((100/EFFI) – 1) (W)

EFFI：Conversion Efficiency (%)

Measurement Condition (Reference data)

Condition: Mount on a board

Ambient:

Natural convection

Soldering: Lead (Pb) free

2

Board: Dimensions 40 x 40 mm (1600 mm

in one side)

Copper (Cu) traces occupy 50% of the board area
In top and back faces
Package heat-sink is tied to the copper traces

Material: Glass Epoxy (FR-4)

Thickness: 1.6mm

Through-hole: 4 x 0.8 Diameter

40.0

28.9

28.9

.

2.54

Evaluation Board (Unit: mm)

1.4

40.0

.

2.5

16/25

XCL205/XCL206/XCL207

Series

■NOTE ON USE (Continued)

●Instructions of pattern layouts

1. In order to stabilize VIN voltage level, we recommend that a by-pass capacitor (CIN) be connected as close as possible to the

IN (No.6) & VSS (No.5) pins.

V

2. Please mount each external component as close to the IC as possible.

3. Wire external components as close to the IC as possible and use thick, short connecting traces to reduce the circuit
impedance.

4. Make sure that the PCB GND traces are as thick as possible, as variations in ground potential caused by high ground currents

at the time of switching may result in instability of the IC.

5. This series’ internal driver transistors bring on heat because of the output current and ON resistance of driver transistors.

6. Please connect Lx (No.1) pin and L1 (No.7) pin by wiring on the PCB.

7. Please connect V

(No.3) pin and L2 (No.8) pin by wiring on the PCB.

OUT

CE

IC

CL

CIN

FRONT

GNDVOUT

LX

VINGND

GNDVOUT

VOUT

CE

GND

BACK (Flip Horizontal)

GND

LX

VIN

CL

CE

IC

CIN

FRONT (PCB mounted)

LX

VINGND

17/25

XCL205/XCL206/XCL207

Series

■TEST CIRCUITS

< Circuit No.1 > < Circuit No.2 >

VSS

L1

VOUT

L2

A

CIN

※　External Compone nts

CIN : 4.7μF(ceramic)

CL : 10μF(ceramic)

VIN Lx

CE/
MODE

< Circuit No.3 > < Circuit No.4 >

L1 L1

VOUT

VSS

L2 L2

1μF

VIN Lx

CE/
MODE

Wave Form Measure Point

V

CL

Wave Form Measure Point

Rpulldown
200Ω

A

1μF

1μF

VSS

VSS

L1

VOUT

L2

VOUT

VIN Lx

CE/
MODE

VIN Lx

CE/
MODE

V

ON resistance = (VIN-VLx)/100mA

100mA

< Circuit No.5 >

1μF

ICEH

A

ICEL

< Circuit No.7 >

1μF

< Circuit No.9 >

A

CIN

L1 L1

VIN Lx

CE/
MODE

VIN Lx

CE/
MODE

VIN Lx

CE/
MODE

VOUT

L2

VSS

VOUT

L2 L2

VSS

L1

VOUT

L2

VSS

ILeakH

A

ILeakL

Wave Form Measure Point

Ilat

Rpulldown
1Ω

<CircuitNo.6>

1μF

<CircuitNo.8>

1uF

< Circuit No.10 >

A

CIN

VIN Lx

CE/
MODE

VIN Lx

CE/
MODE

VIN Lx

CE/
MODE

VSS

VSS

VSS

VOUT

L2

L1L1

VOUT

L1

VOUT

L2

Wave Form Measure Point

V

ILx

A

Wave Form Measure Point

L

CL

ILIM

V

18/25

*External Components

※　External Compone nts
L : 1.5uH(選別品)

L : 1.5μH

CIN : 4.7μF(ceramic)

CIN : 4.7μF (ceramic)

CL : 10μF(ceramic)

CL : 10μF(ceramic)

)

(

)

N

(

)

(

)

N

N

XCL205/XCL206/XCL207

■TYPICAL PERFORMANCE CHARACTERISTICS

(1) Efficiency vs. Output Current (2) Output Voltage vs. Output Current

Efficency:EFFI(%

XCL205A183AR/XCL206A183AR/XCL207A183AR

100

XCL206/XCL207(PWM/PFM)

80

60

2.4V

40

20

3.6V

VIN= 4.2V

XCL205/XCL207

PW M

2.1

2.0

(V)

1.9

OUT

1.8

1.7

Output Voltage:V

1.6

XCL205A183AR/XCL206A183AR/XCL207A183AR

XCL/206/XCL207

PW M/PF M

4.2V,3.6V ,2.4V

VI

＝

XCL205/XCL207

PW M

Series

0

0.1 1 10 100 1000

Output Cur rent:I

(3) Ripple Voltage vs. Output Current

OUT

(4) Oscillation Frequency vs. Ambient Temperature

100

80

60

XCL205/XCL207

40

Ripple Voltage:Vr(mV)

20

0

0.1 1 10 100 1000

(5) Supply Current vs. Ambient Temperature

40

35

30

(μA)

DD

25

20

(PWM)

4.2V,3.6V ,2.4V

VI

＝

Output Cur rent:I

XCL206A183AR/XCL207A183AR

XCL206/XCL207

4.0V

1.5

0.1 1 10 100 1000

(mA)

(PWM/PFM)

4.2V

VI

＝

3.6V

(mA)

OUT

2.4V

Output Cur rent:I

XCL205A183AR/XCL206A183AR/XCL207A183ARXCL205A183AR/XCL206A183AR/XCL207A183AR

3.5

3.4

3.3

3.2

3.1

3.0

2.9

2.8

2.7

2.6

Oscillation Frequency : fosc(MHz)

2.5

-50 -25 0 25 50 75 100

VIN=3.6V

Ambient Temperature: Ta (℃)

OUT

(6) Output Voltage vs. Ambient Temperature

XCL205A183AR/XCL206A183AR/XCL207A183AR

2.1

VIN=6.0V

2.0

(V)

1.9

OUT

1.8

VIN=3.6V

(mA)

15

10

Supply Current : I

5

0

-50 -25 0 25 50 75 100

2.0V

Ambient Temperature: Ta (℃)

1.7

Output Voltage : V

1.6

1.5

-50 -25 0 25 50 75 100

Ambient Temperature: Ta (℃)

19/25

)

XCL205/XCL206/XCL207

Series

■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)

(7) UVLO Voltage vs. Ambient Temperature (8) CE "H" Voltage vs. Ambient Temperature

(9) CE "L" Voltage vs. Ambient Temperature

(11) "Pch / Nch" Driver on Resistance vs. Input Voltage

Lx SW ON Resistance:RLxH,RLxL (Ω)

XCL205A183AR/XCL206A183AR/XCL207A183AR

1.8

CE=V IN

1.5

1.2

0.9

0.6

0.3

UVLO Voltage : UVLO (V)

0.0

-50 -25 0 25 50 75 100

Ambient Temperature: Ta (℃)

(10) Soft Start Time vs. Ambient Temperature

XCL205A183AR/XCL206A183AR/XCL207A183AR

1.0

0.9

0.8

(V)

0.7

CEL

0.6

0.5

0.4

0.3

CE "L" Voltage : V

0.2

0.1

0.0

-50 -25 0 25 50 75 100

XCL205A183AR/XCL206A183AR/XCL207A183AR

1.0

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

0.0
0123456

VIN=5.0V

3.6V

Ambient Temperature: Ta (℃)

Nch on Resistanc e

Pc h on Resistanc e

Input Voltage : V IN (V)

2.4V

(12) Rise Wave Form

XCL205A183AR/XCL206A183AR/XCL207A183AR

1.0

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

CE "H" Voltage : VCEH (V

0.1

0.0

-50 -25 0 25 50 75 100

XCL205A183AR/XCL206A183AR/XCL207A183AR

5.0

4.0

3.0

2.0

VIN=3.6V

Soft Start Time : tss (ms)

1.0

0.0

-50 -25 0 25 50 75 100

XCL205B333AR/XCL206B333AR/XCL207B333AR

XCL206B333
VIN=5.0V
IOUT=1.0mA

2ch

VOUT

1ch

CE:0.0V⇒1.0V

1ch:1V/div 2ch:1V/div

VIN=5.0V

3.6V

2.4V

Ambient Temperature: Ta (℃)

Ambient Temperature: Ta (℃)

Time: 100μs /div

Time:100μs/div

20/25

XCL205/XCL206/XCL207

■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)

(13) Soft-Start Time vs. Ambient Temperature (14) CL Discharge Resistance vs. Ambient Temperature

XCL205B333AR/XCL206B333AR/XCL207B333AR

500

XCL205B333AR/XCL206B333AR/XCL207B333AR

600

XCL207B333

Series

400

300

200

100

Soft Start Time : tss (μs)

0

-50 -25 0 25 50 75 100

Ambient Temperature: Ta (℃)

(15) Load Transient Response

MODE：PWM/PFM Automatic Switching Control

1ch

XCL206A183AR/XCL207A183AR

VIN=3.6V,VOUT=1.8V

IOUT=1mA ⇒ 100mA

VIN=5.0V
IOUT=1 .0 mA

500

2.0V

VIN=6.0V

400

300

200

4.0V

CL Discharge Resistance: (Ω)

100

-50 -25 0 25 50 75 100

Ambient Temperature: Ta (℃)

XCL206A183AR/XCL207A183AR

VIN=3.6V,VOUT=1.8V

IOUT=1mA ⇒ 300mA

1ch

2ch

1ch:100mA/div 2ch:50mV/div

VOUT

Time:100μs/div

Time: 100μs /div Time: 100μs /div

2ch

1ch:100mA/div 2ch:50mV/div

VOUT

Time:100μs/div

1ch

2ch

XCL206A183AR/XCL207A183AR

VIN=3.6V,VOUT=1.8V

IOUT=100mA ⇒ 1mA

1ch

2ch

VOUT

1ch:100mA/div 2ch:50mV/div

XCL206A183AR/XCL207A183AR

VIN=3.6V,VOUT=1.8V

IOUT=300mA ⇒ 1mA

VOUT

1ch:100mA/div 2ch:50mV/div

Time:100μs/div

Time: 100μs /div Time: 100μs /div

Time:100μs/div

21/25

XCL205/XCL206/XCL207

Series

■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)

(15) Load Transient Response (Continued)

MODE：PWM Control

1ch

2ch

XCL205A183AR/XCL207A183AR

VIN=3.6V,VOUT=1.8V

IOUT=1mA ⇒ 100mA

1ch:100mA/div 2ch:50mV/div

Time:100μs/div

Time: 100μs /div Time: 100μs /div

VIN=3.6V,VOUT=1.8V

1ch

2ch

1ch:100mA/div 2ch:50mV/div

XCL205A183AR/XCL207A183AR

IOUT=1mA ⇒ 300mA

Time:100μs/div

1ch

2ch

XCL205A183AR/XCL207A183AR

VIN=3.6V,VOUT=1.8V

IOUT=100mA ⇒ 1mA

1ch:100mA/div 2ch:50mV/div

Time:100μs/div

Time: 100μs /div Time: 100μs /div

XCL205A183AR/XCL207A183AR

VIN=3.6V,VOUT=1.8V

1ch

IOUT=300mA ⇒ 1mA

2ch

1ch:100mA/div 2ch:50mV/div

Time:100μs/div

22/25

XCL205/XCL206/XCL207

■PACKAGING INFORMATION

●CL-2025

●Reference Pattern Layout ●Reference Metal Mask Design

■External Lead

Series

23/25

XCL205/XCL206/XCL207

Series

■MARKING RULE

●CL-2025

1

① ②

2

⑤④

3

(G, I, J, O, Q, W excluded)
Note: No character inversion used.

③

6

5

4

24/25

① represents products series

MARK PRODUCT SERIES

4 XCL205A*****-G

C

K XCL205C*****-G
5 XCL206A*****-G

D

L XCL206C*****-G
6 XCL207A*****-G

E

M XCL207C*****-G

② represents type of DC/DC converters

③ represents the decimal part of output voltage

OUTPUT VOLTAGE (V) MARK PRODUCT SERIES

④,⑤ represents production lot number
01～09、0A～0Z、11～9Z、A1～A9、AA～Z9、ZA～ZZ in order.

XCL205B*****-G
XCL205G*****-G

XCL205B*****-G
XCL206G*****-G

XCL205B*****-G
XCL207G*****-G

(V)

0.x F U

1.x H V

2.x K X

3.x L Y

4.x M Z

X.0 0 XCL20***0***-G

X.05 A XCL20***A***-G

X.1 1 XCL20***1***-G

X.15 B XCL20***B***-G

X.2 2 XCL20***2***-G

X.25 C XCL20***C***-G

X.3 3 XCL20***3***-G

X.35 D XCL20***D***-G

X.4 4 XCL20***4***-G

X.45 E XCL20***E***-G

X.5 5 XCL20***5***-G

X.55 F XCL20***F***-G

X.6 6 XCL20***6***-G

X.65 H XCL20***H***-G

X.7 7 XCL20***7***-G

X.75 K XCL20***K***-G

X.8 8 XCL20***8***-G

X.85 L XCL20***L***-G

X.9 9 XCL20***9***-G

X.95 M XCL20***M***-G

XCL20*A/B/C***** XCL20*G*****

MARK OUTPUT VOLTAGE

XCL205/XCL206/XCL207

Series

1. The products and product specifications contained herein are subject to change without

notice to improve performance characteristics. Consult us, or our representatives

before use, to confirm that the information in this datasheet is up to date.

2. We assume no responsibility for any infringement of patents, patent rights, or other

rights arising from the use of any information and circuitry in this datasheet.

3. Please ensure suitable shipping controls (including fail-safe designs and aging

protection) are in force for equipment employing products listed in this datasheet.

4. The products in this datasheet are not developed, designed, or approved for use with

such equipment whose failure of malfunction can be reasonably expected to directly

endanger the life of, or cause significant injury to, the user.

(e.g. Atomic energy; aerospace; transport; combustion and associated safety

equipment thereof.)

5. Please use the products listed in this datasheet within the specified ranges.

Should you wish to use the products under conditions exceeding the specifications,

please consult us or our representatives.

6. We assume no responsibility for damage or loss due to abnormal use.

7. All rights reserved. No part of this datasheet may be copied or reproduced without the

prior permission of TOREX SEMICONDUCTOR LTD.

25/25