TOREX XCL201, XCL202 User Manual

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■



■

X

XCL201/XCL202 Series

ETR2802-003

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

■GENERAL DESCRIPTION

The XCL201/XCL201 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 400mA is configured using
only two capacitors connected externally.
Operating voltage range is from 2.0V to 6.0V. Output voltage is internally set in a range from 0.8V to 4.0V in increments of

0.05V. The device is operated by 1.2MHz, and includes 0.42ΩP-channel driver transistor and 0.52ΩN-channel switching
transistor. As for operation mode, the XCL201 series is PWM control, the XCL202 series is automatic PWM/PFM switching
control, 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. The
series provide short-time turn-on by the soft start function internally set in 0.25ms (TYP). The series integrate C
discharge function which enables the electric charge stored at the output capacitor C
auto-discharge switch located between the LX and VSS pins. When the devices enter stand-by mode, output voltage quickly
returns to the V

■APPLICATIONS

●Mobile phones, Smart phones

●Bluetooth Headsets

●WiMAX PDAs, MIDs, UMPCs

●Portable game consoles

●Digital cameras, Camcorders

●SSD(Solid State Drive)

●PND(Portable Navigation Device)

TYPICAL APPLICATION CIRCUIT

C

L

10μF

400mA

* “L1 and L

level as a result of this function.

SS

XCL201/XCL202 Series

L1

L

Vss

V

OUT

(TOP VIEW)

”, and “L2 and V

X

VIN

Vss

CE

L2

” is connected by wiring.

OUT

C

IN

4.7μF

■FEATURES

Ultra Small : 2.5mm×2.0mm, h=1.0mm

Input Voltage : 2.0V ~ 6.0V
Output Voltage : 0.8V ~ 4.0V (±2.0%)

High Efficiency : 92%(VIN=4.2V,V

Output Current : 400mA
Oscillation Frequency : 1.2MHz (±15%)

Maximum Duty Cycle : 100%

Output Capacitor : Low ESR Ceramic

Current Limiter Circuit : Constant Current & Latching

Control Methods : PWM (XCL201)

PWM/PFM Auto (XCL202)

CE Function : Soft-Start Circuit Built-In

Operating Ambient Temperature

Environmentally Friendly : EU RoHS Compliant, Pb Free

TYPICAL PERFORMANCE

CHARACTERISTICS

100

80

60

40

Efficency:EFFI(%

20



to be discharged via the internal

L

XCL201B331BR/XCL202B331BR

XCL202(PWM/PFM)

4.2V

0

0.01 0.1 1 10 100 1000

☆GreenOperation Compatible

: -40℃〜+85℃

VIN = 5.5V

5.0V

Output Curr ent:I

XCL201(PWM)

VOUT=3.3V

(mA)

OUT

auto

L

OUT

=3.3V)

1/21

XCL201/XCL202 Series

■PIN CONFIGURATION

L1

7

1

6

V

IN

5

Vss

CE

4

8

L2

(BOTTOM VIEW)

■PIN ASSIGNMENT

Lx

Vss

2

VOUT

3

* It should be connected the VSS pin (No. 2 and 5) to the GND pin.

* 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.

PIN NUMBER PIN NAME

FUNCTION

1 Lx Switching Output

2,5 VSS Ground

3 V

Output Voltage

OUT

4 CE Chip Enable
6 VIN Power Input
7 L1
8 L2

Inductor Electrodes

■PRODUCT CLASSIFICATION

●Ordering Information
XCL201①②③④⑤⑥-⑦
XCL202①②③④⑤⑥-⑦

(*1)

Fixed PWM control

(*1)

PWM / PFM automatic switching control

DESIGNATOR ITEM SYMBOL DESCRIPTION

①

②③

Functions selection B C

Output Voltage

(*2)

auto discharge, High speed soft-start

L

10 1.0V
12 1.2V
15 1.5V

18 1.8V
25 2.5V
28 2.8V
30 3.0V
33 3.3V

④

⑤⑥-⑦

(*1)

The “-G” suffix denotes 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)

Oscillation Frequency 1 1.2MHz

Package

(Order Unit)

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

2/21

■BLOCK DIAGRAM



●XCL201B / XCL202B Series

XCL201/XCL202

Series

L2 L1

VOUT

CFB

R1

FB

V

R2

VIN

SS

R3

R4

Vref with

Soft Start,

CE

UVLO

VSHORT



Phase

Compensation

Error
Amp.

PWM/PFM

Selector

UVLO Cmp

Inductor

Current Feedback

PWM

Comparator

Current Limit

Logic

Ramp Wave

Generator

OSC

CE

Control

Logic

Synch
Buffer

Drive

Lx

VSS

CE/

CE

NOTE: The XCL201 offers a fixed PWM control, a signal from CE Control Logic to PWM/PFM Selector is fixed to "L" level inside. The

XCL202 control scheme is PWM/PFM automatic switching, a signal from CE Control Logic to PWM/PFM Selector is fixed to "H" level

inside. The diodes placed inside are ESD protection diodes and parasitic diodes.

■ABSOLUTE MAXIMUM RATINGS

Ta = 2 5 ℃

PAR AMET ER SYMBOL RATINGS UNITS

VIN Pin Voltage VIN - 0.3 ~ 6.5 V

LX Pin Voltage VLX - 0.3 ~ V

V

Pin Voltage V

OUT

- 0.3 ~ 6.5 V

OUT

CE Pin Voltage VCE - 0.3 ~ 6.5 V

LX Pin Current I

±1500 mA

LX

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 12 for details.

+ 0.3≦6.5 V

IN

3/21

XCL201/XCL202 Series

■ELECTRICAL CHARACTERISTICS

XCL201B121BR/XCL202B121BR, V

OUT

=1.2V, f

=1.2MHz, Ta=25℃

OSC

PARAMETER SYMBOL CONDITIONS

Output Voltage V

Operating Voltage Range

Maximum Output Current

UVLO Voltage V

Supply Current (XCL201) - 22 50

Supply Current (XCL202)

Stand-by Current I

Oscillation Frequency

PFM Switching Current

PFM Duty Limit

(*11)

I

(*11)

DTY

OUT

V

I

OUTMAX

UVLO

I

DD

STB

f

OSC

PFM

LIMIT_PFM

IN

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

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

Soft Start Time

Latch Time

Short Protection

Threshold Voltage

CL Discharge

Inductance Value

Allowed Inductor Current I

Test conditions: Unless otherwise stated, VIN=5.0V, V
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)

Time until it short-circuits V

(*7)

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

(*8)

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.

(*9)

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

(*10)

“H”=VIN~VIN-1.2V, “L”=+0.1V~-0.1V

(*11)

I

and DTY

PFM

(*2)

EFFI

R

LｘH1

R

LｘH2

R

LｘL1

R

(*5)

(*9)

I

LｘL2

I

LeakH

LIM

△

V

OUT

(V

・△

OUT

CEH

CEL

CEH

CEL

t

SS

t

LAT

V

SHORT

R

DCHG

L Test frequency=1MHz - 4.7 - μH-

DC

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

OUT

are defined only for the XCL202 series which have PFM control function. (Not for the XCL201 series)

LIMIT_PFM

When connected to external components,
V

IN=VCE

=5.0V, I

OUT

=30mA

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

IN=VCE

VIN=5.0V, VCE=0V, V

When connected to external components,
V

IN=VOUT(T)

When connected to external components,
V

IN=VOUT(T)

VCE=VIN = 2.0V, I

+2.0V, VCE=1.0V

=0V

=5.0V, V

OUT=VOUT(T)

OUT

+2.0V, VCE=1.0V , I

+2.0V, VCE=VIN , I

=1mA - 200 300 % ①

OUT

OUT=VOUT (T)

OUT=VOUT (T)

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

V

/

Topr)

OUT

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
VIN=VCE=5.0V, V
V

=5.0V, VCE=0V, V

IN

When connected to external components,

=0V→V

V

CE

V

IN=VCE

Short Lx at 1Ω resistance

Sweeping V

1Ω resistance, V

level within 1ms

+1.2V, I

=0V,ILX=100mA

OUT

=0V,ILX=100mA

OUT

(*4)

- 0.45 0.66 Ω -

(*4)

- 0.52 0.77 Ω -

=5.0V, VCE=0V, LX=0V - 0.01 1.0 μA ⑨

=5.0V, V

=5.0V, V

OUT=VOUT (T)

=0V - 0.1 - 0.1 μA ⑤

OUT

OUT

, I

=1mA

IN

OUT

=0.8×V

OUT

, VIN=VCE=5.0V, Short Lx at

OUT

voltage which Lx becomes “L”

OUT

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

ΔT=40℃ - 600 - mA -

=Nominal Voltage

OUT(T)

(*8)

(*1, *10)

×1.1V

= V

×1.1V - 0 1.0 μA ③

OUT(T)

=100mA

OUT

=1mA

OUT

×0.9V 100 - - % ③
×1.1V - - 0 % ③

=100mA

OUT

×0.9V

(*10)

(*10)

(*3)

- 0.35 0.55 Ω ④

(*3)

- 0.42 0.67 Ω ④

(*7)

700 800 1000 mA ⑥

=0V - 0.1 - 0.1 μA ⑤

OUT(T)

(*6)

=open 200 300 450 Ω ⑧

OUT

MIN. TYP. MAX.

1.176 1.200 1.224 V ①

400 - - mA ①

1.00 1.40 1.78 V ②

- 15 33

1020 1200 1380 kHz ①

140 180 240 mA ⑩

- 86 - % ①

- ±100 - ppm/ ℃ ①

0.65 - 6.0 V ③

- 0.25 V ③

V

SS

- 0.25 0.40 ms ①

1.0 - 20 ms ⑦

0.450 0.600 0.750 V ⑦

UNITS

CIRCUIT

μA ②

4/21

■ELECTRICAL CHARACTERISTICS (Continued)

XCL201B181BR/XCL202B181BR, V

OUT

=1.8V, f

=1.2MHz, Ta=25℃

OSC

XCL201/XCL202

Series

PARAMETER SYMBOL CONDITIONS

Output Voltage V

Operating Voltage Range

Maximum Output Current

UVLO Voltage V

Supply Current (XCL201) - 22 50

Supply Current (XCL202)

Stand-by Current I

Oscillation Frequency

PFM Switching Current

PFM Duty Limit

(*11)

(*11)

DTY

I

OUT

V

I

OUTMAX

UVLO

I

DD

STB

f

OSC

PFM

LIMIT_PFM

IN

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

CE "H" Current I

CE "L" Current I

Soft Start Time

Latch Time

Short Protection

Threshold Voltage

CL Discharge

Inductance Value

Allowed Inductor Current I

Test conditions: Unless otherwise stated, VIN=5.0V, V
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)

Time until it short-circuits V

(*7)

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

(*8)

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.

(*9)

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

(*10)

“H”=VIN~VIN-1.2V, “L”=+0.1V~-0.1V

(*11)

I

and DTY

PFM

(*2)

EFFI

R

LｘH1

R

LｘH2

R

LｘL1

R

(*5)

(*9)

I

LｘL2

I

LeakH

LIM

△

V

OUT

(V

・△

OUT

CEH

CEL

CEH

CEL

t

SS

t

LAT

V

SHORT

R

DCHG

L Test frequency=1MHz - 4.7 - μH-

DC

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

OUT

are defined only for the XCL202 series which have PFM control function. (Not for the XCL201 series)

LIMIT_PFM

When connected to external components,
V

IN=VCE

=5.0V, I

OUT

=30mA

2.0 - 6.0 V ①

V

IN=VOUT(E)

When connected to external components
V

CE=VIN,VOUT

Voltage which Lx pin holding “L” level

V

IN=VCE

VIN=5.0V, VCE=0V, V

When connected to external components,
V

IN=VOUT(T)

When connected to external components,
V

IN=VOUT(T)

VCE=VIN=V

+2.0V, VCE=1.0V

=0V

=5.0V, V

OUT=VOUT(T)

OUT=VOUT(T)

+2.0V, VCE=1.0V , I

+2.0V, VCE=VIN , I

+0.5V, I

OUT(T)

OUT=VOUT (T)

OUT=VOUT (T)

(*8)

(*1, *10)

×1.1V

×1.1V - 0 1.0 μA ③

=100mA

OUT

=1mA

OUT

=1mA - 200 300 % ①

OUT

×0.9V 100 - - % ③
×1.1V - - 0 % ③

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

V

/

Topr)

V

OUT

IN=VCE

=30mA

I

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

IN=VCE

VIN=5.0V, VCE=0V, V

When connected to external components,
V

=0V→V

CE

V

IN=VCE

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

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

+1.2V, I

OUT

OUT

(*4)

- 0.45 0.66 Ω -

(*4)

- 0.52 0.77 Ω -

=5.0V, VCE=0V, L

= 5.0V, V

=5.0V, V

=5.0V, V

OUT=VOUT (T)

OUT

, I

IN

OUT

OUT

, VIN=VCE=5.0V, Short Lx at

OUT

OUT

=100mA

OUT

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

X

=0V - 0.1 - 0.1 μA ⑤

=0V - 0.1 - 0.1 μA ⑤

OUT

=1mA

=0.8×V

(*6)

voltage which Lx becomes

(*3)

- 0.35 0.55 Ω ④

(*3)

- 0.42 0.67 Ω ④

=0V - 0.01 1.0 μA ⑨

(*7)

×0.9V

OUT(T)

700 800 1000 mA ⑥

(*10)

(*10)

=open 200 300 450 Ω ⑧

OUT

ΔT=40℃ - 600 - mA -

=Nominal Voltage

OUT (T)

MIN. TYP. MAX.

1.764 1.800 1.836 V ①

400 - - mA ①

1.00 1.40 1.78 V ②

- 15 33

1020 1200 1380

120 160 200 mA ⑩

- 89 - % ①

- ±100 - ppm/ ℃ ①

0.65 - 6.0 V ③

- 0.25 V ③

V

SS

- 0.32 0.50 ms ①

1.0 - 20 ms ⑦

0.675 0.900 1.125 V ⑦

UNITS

CIRCUIT

μA ②

kHz ①

5/21

XCL201/XCL202 Series

■ELECTRICAL CHARACTERISTICS (Continued)

The value and conditions are depends on setting output voltage.

●PFM Switching Current (I

) (XCL202)

PFM

NOMINAL OUTPUT VOLTAGE MIN. TYP. MAX.

0.8V≦V

1.2V＜V

1.8V≦V

OUT(T)

OUT(T)

OUT(T)

≦1.2V
＜1.8V
≦4.0V

140mA 180mA 240mA

130mA 170mA 220mA

120mA 160mA 200mA

●PFM Duty Limit DTY

LIMIT_PFM

(XCL202)

SETTING VOLTAGE CONDITIONS

0.8V≦V

1.0V≦V

＜1.0V

OUT(T)

≦4.0V V

OUT(T)

=2.0V, I

V

CE=VIN

CE=VIN=VOUT(T)

=1mA

OUT

+0.5V, I

OUT

●Soft-Start Time t

 SERIES OUTPUT VOLTAGE MIN. TYP. MAX.

SS

=1mA

- 0.25ms 0.40ms

- 0.32ms 0.50ms

- 0.28ms 0.40ms

- 0.32ms 0.50ms

- 0.28ms 0.40ms

- 0.32ms 0.50ms

XCL201B

XCL202B

0.8V≦V

1.5V≦V

1.8V≦V

2.5V≦V

0.8V≦V

2.5V≦V

OUT(T)

OUT(T)

OUT(T)

OUT(T)

OUT(T)

OUT(T)

＜1.5V

＜1.8V

＜2.5V

≦4.0V

＜2.5V

≦4.0V

■TYPICAL APPLICATION CIRCUIT

XCL201/XCL202 Series

L1

Lx

Vss

C

L

OUT

V

●External Components

C

: 10V/4.7μF(Ceramic)

IN

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 C

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

L2

V

IN

Vss

CE

C

IN

and CL capacitors.

IN

6/21

XCL201/XCL202

Series

■OPERATIONAL DESCRIPTION

The XCL201/XCL202 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 below.) Using the error amplifier, the voltage
of the internal voltage reference source is compared with the feedback voltage from the V
compensation is performed on the resulting 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.

L2 L1

Inductor

VOUT

V

VIN

CFB

R1

FB

R2

Vref with

Soft Start,

R3

SS

R4

CE

UVLO

Phase

Compensation

Error
Amp.

VSHORT

UVLO Cmp

PWM/PFM

Selector

Current Feedback

PWM

Comparator

Current Limit

Logic

Ramp Wave

Generator

OSC

CE

Control

Logic

Synch
Buffer

Drive

Lx

VSS

CE/

CE

<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 1.2MHz. 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.

pin through split resistors, R1 and R2. Phase

OUT

7/21