TOREX XC9235, XC9236, XC9237 User Manual

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XC9235/XC9236/XC9237

Series

ETR0514-012

600mA Driver Tr. Built-In, Synchronous Step-Down DC/DC Converters

■GENERAL DESCRIPTION

The XC9235/XC9236/XC9237 series is a group of synchronous-rectification type DC/DC converters with a built-in 0.42Ω P-channel MOS driver transistor and 0.52ΩN-channel MOS switching transistor, designed to allow the use of ceramic capacitors. Operating voltage range is from 2.0V to 6.0V (A～C types), 1.8V to 6.0V (D～G types). For the D/F types which have a reference voltage of 0.8V (accuracy: ±2.0%), the output voltage can be set from 0.9V by using two external resistors. The A/B/C/E/G types have a fixed output voltage from 0.8V to 4.0V in increments of 0.05V (accuracy: ±2.0%). The device provides a high efficiency, stable power supply with an output current of 600mA to be configured using only a coil and two capacitors connected externally. With the built-in oscillator, either 1.2MHz or 3.0MHz can be selected for suiting to your particular application. As for operation mode, the XC9235 series is PWM control, the XC9236 series is automatic PWM/PFM switching control and the XC9237 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). The soft start and current control functions are internally optimized. During stand-by, all circuits are shutdown to reduce current consumption to as low as 1.0μA or less. The B/F/G types have a high speed soft-start as fast as 0.25ms in typical for quick turn-on. With the built-in UVLO (Under Voltage Lock Out) function, the internal P-channel MOS driver transistor is forced OFF when input voltage becomes 1.4V or lower. The B to G types integrate C via the internal discharge switch located between the L quickly returns to the V Three t

■APPLICATIONS

●Mobile phones, Smart phones

●Bluetooth headsets

●Mobile WiMAX PDAs, MIDs, UMPCs

●Portable game consoles

●Digital cameras, Camcorders

●MP3 Players, Portable Media Players

●Notebook computers

■

●XC9235/XC9236/XC9237

D/F types (Output Voltage Externally Set)

es of package SOT-25 (A/B/C types only), USP-6C, and 0.4mm low height USP-6EL (A/B/C types only) are available.

TYPICAL APPLICATION CIRCUIT

/B/C/E/G types (Output Voltage Fixed)

discharge function which enables the electric charge at the output capacitor CL to be discharged

L

level as a result of this function.

SS

and VSS pins. When the devices enter stand-by mode, output voltage

X

■FEATURES

Driver Transistor Built-In

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

1.8V ~ 6.0V (D/E/F/G types)

Output Voltage : 0.8V ~ 4.0V (Internally set)

High Efficiency : 92% (TYP.)

Output Current : 600mA

Oscillation Frequency : 1.2MHz, 3.0MHz (+15%)

Maximum Duty Cycle : 100%

Control Methods : PWM (XC9235)

PWM/PFM Auto (XC9236)

Function

Capacitor Operating Ambient Temperature

Packages : SOT-25 (A/B/C types only), USP-6C

USP-6EL(A/B/C types only)

Environmentally Friendl

■

TYPICAL PERFORMANCE CHARACTERISTICS

●Efficiency vs. Output Current（f

PWM/PFM Automatic Sw itching Control

100

90

80

VIN= 4.2V

70

3.6V

60

2.4V

50

40

30

Efficency:EFFI(%

Efficiency: EFFI (%)

20

10

0

0.1 1 10 100 1000

Output Current:IOUT(mA)

☆GreenOperation Compatible

: 0.42Ω P-ch driver transistor

0.52Ω N-ch switch transistor

0.9V ~ 6.0V (Externally set)

PWM/PFM Manual (XC9237) : Current Limiter Circuit Built-In

(Constant Current & Latching)

C

Discharge (B/C/D/E/F/G types)

L

High Speed Soft Start (B/F/G type)

:

Low ESR Ceramic Capacitor

:-40℃ ~ +85℃

: EU RoHS Com

=1.2MHz, VOUT=1.8V）

OSC

PWM Control VIN= 4.2V

3.6V

2.4V

liant, Pb Free

1/33

to other pins, it should be connected to the

XC9235/XC9236/XC9237

■PIN CONFIGURATION

Lx VOUT

5 4

VIN 6

VSS 5

CE/MODE 4

132

VSS CE/MODEVIN

SOT-25

(Top View)

Series

USP-6C

(BOTTOM VIEW)

* Please short the VSS pin (No. 2 and 5). * The dissipation pad for the USP-6C package should be solder-plated in recommended mount pattern and metal masking so as to enhance mounting strength and heat release. If the pad needs to be connected

1 Lx

2 VSS

3 VOUT (FB)

VIN 6

VSS 5

CE/MODE 4

V(No. 5) pin.

1 Lx

2 VSS

3 VOUT

USP-6EL

(BOTTOM VIEW)

■PIN ASSIGNMENT

PIN NUMBER

SOT-25 USP-6C/USP-6EL

1 6 VIN Power Input 2 2, 5 VSS Ground 3 4 CE / MODE High Active Enable / Mode Selection Pin

4 3

5 1 Lx Switching Output

2/33

PIN NAME FUNCTION

VOUT

FB

Fixed Output Voltage Pin (A/B/C/E/G types)

Output Voltage Sense Pin (D/F types)

XC9235/XC9236/XC9237

■PRODUCT CLASSIFICATION

●Ordering Information

XC9235①②③④⑤⑥-⑦ XC9236①②③④⑤⑥-⑦ XC9237①②③④⑤⑥-⑦

DESIGNATOR ITEM SYMBOL DESCRIPTION

Fixed Output voltage (V

①

Functional selection

Adjustable Output voltage (FB)

Functional selection

Fixed Output Voltage

②③

Adjustable Output Voltage

④

Oscillation Frequency

⑤⑥-⑦

(*1)

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

(*2)

SOT-25, USP-6EL package are available for the A/B/C series only.

(*1)

Fixed PWM control

(*1)

PWM / PFM automatic switching control

(*1)

Fixed PWM control QPWM / PFM automatic switching manual selection

A VIN≧2.0V, No CL discharge, Low speed soft-start

B VIN≧2.0V, CL discharge, High speed soft-start

)

OUT

C VIN≧2.0V, CL discharge, Low speed soft-start

E VIN≧1.8V, CL discharge, Low speed soft-start

G V

≧1.8V, CL discharge, High speed soft-start

IN

D VIN≧1.8V, CL discharge, Low speed soft-start

F VIN≧1.8V, CL discharge, High speed soft-start

Output voltage options

(V

OUT

e.g. V

)

08 ~ 40

0.05V increments: 0.05=A, 0.15=B, 0.25=C, 0.35=D, 0.45=E,

=2.8V→②=2, ③=8

OUT

V

=2.85V→②=2, ③=L

OUT

0.55=F, 0.65=H, 0.75=K, 0.85=L, 0.95=M

Reference voltage is fixed in 0.8V ②=0, ③=8

(FB)

08

C 1.2MHz

D 3.0MHz

(*2)

(3,000/Reel)

(*2)

(3,000/Reel)

Packages

(Order Unit)

MR SOT-25

MR-G SOT-25

ER USP-6C (3,000/Reel)

ER-G USP-6C (3,000/Reel)

(*2)

4R-G USP-6EL

(3,000/Reel)

Series

3/33

XC9235/XC9236/XC9237

Series

■BLOCK DIAGRAM

●XC9235 / XC9236 / XC9237

A Series

●XC9235 / XC9236 / XC9237 D/F Series

■ABSOLUTE MAXIMUM RATINGS

Power Dissipation

NOTE: The signal from CE/MODE Control Logic to PWM/PFM Selector is being fixed to "L" level inside,

and XC9235 series chooses only PWM control.

The signal from CE/MODE Control Logic to PWM/PFM Selector is being fixed to "H" level inside,

and XC9236 series chooses only PWM/PFM automatic switching control.

Diodes inside the circuit are ESD protection diodes and parasitic diodes.

PAR AMETER SYMBOL RATINGS UNIT

VIN Pin Voltage VIN - 0.3 ~ 6.5 V

Lx Pin Voltage VLx - 0.3 ~ VIN + 0.3 V

V

Pin Voltage V

OUT

FB Pin Voltage VFB - 0.3 ~ 6.5 V

CE / MODE Pin Voltage VCE - 0.3 ~ 6.5 V

Lx Pin Current ILx ±1500 mA

SOT-25 250

(*Ta=25℃)

Operating Ambient Temperature Topr - 40 ~ + 85

Storage Temperature Tstg - 55 ~ + 125

USP-6C 120

USP-6EL

- 0.3 ~ 6.5 V

OUT

Pd

●XC9235 / XC9236 / XC9237

B/C/E/G Series

120

Ta =2 5℃

mW

O

C

O

C

4/33

■ELECTRICAL CHARACTERISTICS

XC9237A18Cxx, V

OUT

=1.8V, f

=1.2MHz, Ta=25℃

OSC

XC9235/XC9236/XC9237

Series

PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNIT

Output Voltage V

OUT

When connected to external components, V

IN=VCE

=5.0V, I

=30mA

OUT

1.764 1.800 1.836 V ①

Operating Voltage Range VIN 2.0 - 6.0 V ①

V

Maximum Output Current I

UVLO Voltage V

OUTMAX

UVLO

Supply Current IDD V

Stand-by Current I

Oscillation Frequency f

PFM Switching Current I

PFM Duty Limit DTY

Maximum Duty Cycle DTY

Minimum Duty Cycle DTY

Efficiency

(*2)

EFFI

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" Leak Current

Lx SW "L" Leak Current

Current Limit

(*5)

I

(*5)

I

(*10)

I

Output Voltage

Temperature Characteristics

(V

CE "H" Voltage V

CE "L" Voltage V

VIN=5.0V, VCE=0V, V

STB

OSC

PFM

LIMIT_PFM

MAX

MIN

LxH

VIN=VCE=5.0V

LxL

VIN=VCE=3.6V

LxL

LeakH

LeakL

V

LIM

△V

OUT

・△Topr)

OUT

CEH

CEL

IN=VOUT(E)

When connected to external components

V

CE

Voltage which Lx pin holding “L” level

IN=VCE

When connected to external components, V

IN=VOUT(E)

When connected to external components, V

IN=VOUT(E)

VCE=VIN=(C-1), I

VIN=VCE=5.0V, V

When connected to external components, V

CE=VIN=VOUT(E)

VIN=VCE=5.0V, V

VIN=VCE=3.6V, V

VIN=V

IN=VCE

/

I

OUT

V

OUT

Voltage changes Lx to “H” level V

OUT

Voltage changes Lx to “L” level

When connected to external components,

PWM "H" Level Voltage V

PWMH

I

OUT

becomes 1020 kHz≦f

When connected to external components,

PWM "L" Level Voltage V

PWML

I

OUT

becomes f

CE "H" Current I

CE "L" Current I

Soft Start Time tSS

Latch Time t

Short Protection Threshold

Voltage

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)= (V *4: R&D value *5: When temperature is high, a current of approximately 10μA (maximum) may leak.

*6: The CE/MODE pin of the XC9237A 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

mode when the CE/MODE pin voltage is equal to or lower than V *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. *11: “H”=V *12: XC9235 series exclude I

*13: XC9235/9236 series exclude V

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

IN

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

-1.2V, “L”=+0.1V~-0.1V

IN~VIN

- Lx pin measurement voltage) / 100mA

IN

PFM

VIN=VCE=5.0V, V

CEH

VIN=5.0V, VCE=0V, V

CEL

When connected to external components, V

CE

V

LAT

IN=VCE

Short Lx at 1Ω resistance Sweeping V

V

SHORT

1Ω resistance, V “L” level within 1ms

OUT(E)

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

OUT

and DTY

PWMH

because those are only for the PFM control’s functions.

LIMIT_PFM

and V

because those are only for the XC9237 series’ functions.

PWML

+2.0V, VCE=1.0V,

=VIN, V

OUT

=0V,

OUT

=5.0V, V

OUT=VOUT(E)

+2.0V, VCE =1.0V, I

+2.0V, VCE =VIN, I

OUT

OUT=VOUT(E)

+1.2V, I

OUT

(*4)

- 0.45 0.65 Ω ④

(*4)

×1.1V - 15 33 μA ②

OUT=VOUT(E)

=1mA

×1.1V - 0 1.0 μA ②

=100mA

OUT

=1mA

OUT

(*12)

200 300 % ①

×0.9V 100 - - % ③ ×1.1V - - 0 % ③

=100mA

OUT

=0V, ILx=100mA

=5.0V, VCE=0V, Lx=0V - 0.01 1.0 μA ⑤

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

=5.0V, V

OUT=VOUT(E)

×0.9V

(*9)

(*1, *11)

(*12)

(*3)

- 0.35 0.55 Ω ④

(*3)

- 0.42 0.67 Ω ④

(*8)

900 1050 1350 mA ⑥

=30mA, -40℃≦Topr≦85℃ - ±100 -

=0V, Applied voltage to VCE,

=0V, Applied voltage to VCE ,

(*6)

=1mA

=0V → VIN, I

, Voltage which oscillation frequency

OSC

(*6)

, Voltage which oscillation frequency

＜1020kHz

OSC

=0V - 0.1 - 0.1 μA ⑤

OUT

=0V - 0.1 - 0.1 μA ⑤

OUT

=1mA

=5.0V, V

OUT

=0.8×V

OUT

, VIN=VCE=5.0V, Short Lx at

OUT

voltage which Lx becomes

OUT

(*11)

≦1380kHz

(*13)

,

OUT(E)

(*7)

(*13)

600 - - mA ①

1.00 1.40 1.78 V ③

1020 1200 1380 kHz ①

120 160 200 mA ①

- 92 - % ①

- 0.52 0.77 Ω -

ppm/

0.65 - 6.0 V ③

V

- 0.25 V ③

SS

- - V

–

V

IN

0.25

- 1.0 V ①

IN

- - V ①

0.5 1.0 2.5 ms ①

1.0 - 20.0 ms ⑦

0.675 0.900 1.150 V ⑦

=Nominal Voltage

minus 0.3V, and to the PWM

minus 1.0V and equal to or greater than V

IN

CEH

.

IN

℃

CIRCUIT

①

5/33

XC9235/XC9236/XC9237

Series

■ELECTRICAL CHARACTERISTICS (Continued)

XC9237A18Dxx, V

OUT

=1.8V, f

=3.0MHz, Ta=25℃

OSC

PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNIT

Output Voltage V

OUT

When connected to external components, V

IN=VCE

=5.0V, I

OUT

=30mA

1.764 1.800 1.836 V ①

Operating Voltage Range VIN 2.0 - 6.0 V ①

Maximum Output Current I

UVLO Voltage V

OUTMAX

UVLO

V When connected to external components

V Voltage which Lx pin holding “L” level

Supply Current IDD VIN=VCE=5.0V, V

Stand-by Current I

Oscillation Frequency f

PFM Switching Current I

PFM Duty Limit DTY

Maximum Duty Cycle DTY

Minimum Duty Cycle DTY

Efficiency EFFI

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" Leak Current

Lx SW "L" Leak Current

Current Limit

(*5)

I

(*5)

I

(*10)

I

Output Voltage

Temperature Characteristics

(V

CE "H" Voltage V

CE "L" Voltage V

VIN=5.0V, VCE=0V, V

STB

When connected to external components,

OSC

PFM

LIMIT_PFM

V

When connected to external components, V

VCE=VIN=(C-1), I

VIN=VCE=5.0V, V

MAX

VIN=VCE=5.0V, V

MIN

When connected to external components, V

VIN=VCE=5.0V, V

LxH

VIN=VCE=3.6V, V

LxH

VIN=VCE=5.0V

LxL

VIN=VCE=3.6V

LxL

VIN=V

LeakH

VIN=V

LeakL

VIN=VCE=5.0V, V

LIM

△V

/

・△Topr)

OUT

CEH

CEL

OUT

I

V Voltage changes Lx to “H” level V Voltage changes Lx to “L” level

When connected to external components,

PWM "H" Level Voltage V

PWMH

I becomes 2550kHz≦f

When connected to external components,

PWM "L" Level Voltage V

PWML

I

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

LAT

Short Lx at 1Ω resistance

V

Sweeping V

V

SHORT

1Ω resistance, V “L” level within 1ms

IN=VOUT(E)

CE=VIN

IN=VOUT(E)

CE=VIN＝VOUT(E)

OUT

CE

IN=VCE

+2.0V, VCE=1.0V,

, V

=0V,

OUT

OUT=VOUT(E)

+2.0V, VCE=1.0V, I

+2.0V, VCE=VIN, I

OUT

OUT=VOUT(E)

+1.2V, I

OUT

(*4)

=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

OUT=VOUT(E)

×1.1V - 21 35 μA ②

OUT=VOUT(E)

=1mA

×1.1V - 0 1.0 μA ②

=100mA

OUT

=1mA

OUT

(*12)

- 200 300 % ①

×0.9V 100 - - % ③ ×0.1V - - 0 % ③

=100mA

OUT

=0V, ILx=100mA

×0.9V

(*9)

(*1,*11)

(*12)

(*3)

- 0.35 0.55 Ω ④

(*3)

(*8)

900 1050 1350 mA ⑥

=30mA, -40℃≦Topr≦85℃ - ±100 -

=0V, Applied voltage to VCE,

(*6)

=1mA

=0V → VIN, I

, Voltage which oscillation frequency

OSC

(*6)

, Voltage which oscillation frequency

＜2550kHz

OSC

=0V - 0.1 - 0.1 μA ⑤

OUT

=0V - 0.1 - 0.1 μA ⑤

OUT

=1mA

=5.0V, V

OUT

=0.8×V

OUT

, VIN=VCE=5.0V, Short Lx at

OUT

voltage which Lx becomes

OUT

(*11)

≦3450kHz

(*13)

,

OUT(E)

(*7)

(*13)

600 - - mA ①

1.00 1.40 1.78 V ③

2550 3000 3450 kHz ①

170 220 270 mA ①

- 86 - % ①

- 0.42 0.67 Ω ④

- 0.45 0.65 Ω -

- 0.52 0.77 Ω -

ppm/

0.65 - 6.0 V ③

V

- 0.25 V ③

SS

- - V

V

–

IN

0.25

- 1.0 V ①

IN

- - V ①

0.5 0.9 2.5 ms ①

1.0 - 20 ms ⑦

0.675 0.900 1.150 V ⑦

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)= (V *4: R&D value *5: When temperature is high, a current of approximately 10μA (maximum) may leak. *6: The CE/MODE pin of the XC9237A 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 mode when the CE/MODE pin voltage is equal to or lower than V

*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. *11: “H”=V *12: XC9235 series exclude I *13: XC9235/9236 series exclude V

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

IN

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

-1.2V, “L”=+0.1V~-0.1V

IN~VIN

- Lx pin measurement voltage) / 100mA

IN

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

OUT

and DTY

PFM

LIMIT_PFM

and V

=Nominal Voltage

OUT(E)

minus 1.0V and equal to or greater than V

IN

because those are only for the PFM control’s functions.

because those are only for the XC9237 series’ functions.

CEH

minus 0.3V, and to the PWM

.

IN

6/33

℃

CIRCUIT

①

XC9235/XC9236/XC9237

■ELECTRICAL CHARACTERISTICS (Continued)

XC9237B(C)(E)(G)18Cxx, V

PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNIT

Output Voltage V

Operating Voltage Range (B/C series) Operating Voltage Range (E/G series)

Maximum Output Current I

UVLO Voltage V

Supply Current IDD V

Stand-by Current I

Oscillation Frequency f

PFM Switching Current I

PFM Duty Limit

Maximum Duty Cycle

Minimum Duty Cycle

Efficiency

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" Leak Current

Current Limit

Output Voltage

Temperature Characteristics

CE "H" Voltage V

CE "L" Voltage V

PWM "H" Level Voltage V

PWM "L" Level Voltage V

CE "H" Current I

CE "L" Current I

Soft Start Time (B/G Series) tSS

Soft Start Time (C/E Series) tSS

Latch Time t

Short Protection Threshold

Voltage (B/C Series)

Short Protection Threshold

Voltage (E/G Series)

CL Discharge R

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)= (V *4: R&D value *5: When temperature is high, a current of approximately 10μA (maximum) may leak. *6: The CE/MODE pin of the XC9237A 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

mode when the CE/MODE pin voltage is equal to or lower than V *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.

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

*12: XC9235 series exclude I

*13: XC9235/9236 series exclude V

*14: V

(*2)

EFFI

(*5)

(*10)

I

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

IN

-1.2V, “L”=+0.1V~-0.1V

IN~VIN

is applied when V

IN

=1.8V, f

OUT

VIN

OUTMAX

UVLO

STB

OSC

PFM

DTY

LIMIT_PFM

DTY

LxH

LxL

I

IN

OUT (E)

LeakH

LIM

△V

OUT

(V

・△Topr)

OUT

CEH

CEL

PWMH

PWML

CEH

CEL

LAT

V

SHORT

V

SHORT

DCHG

- Lx pin measurement voltage) / 100mA

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

OUT

and DTY

PFM

PWMH

x 0.5V becomes more than VIN.

=1.2MHz, Ta=25℃

OSC

When connected to external components, V

IN=VCE

=5.0V, I

=30mA

OUT

1.764 1.800 1.836 V ①

2.0 - 6.0

1.8 - 6.0 V

IN=VOUT(E)

When connected to external components V

CE

Voltage which Lx pin holding “L” level

IN=VCE

VIN=5.0V, VCE=0V, V

When connected to external components, V

IN=VOUT(E)

When connected to external components, V

IN=VOUT(E)

V

CE=VIN

V

MAX

MIN

IN=VCE

V

IN=VCE

When connected to external components, V

CE=VIN=VOUT(E)

VIN=VCE=5.0V, V

VIN=VCE=3.6V, V

VIN=VCE=5.0V

VIN=VCE=3.6V

VIN=V

V

IN=VCE

/

I

OUT

V

OUT

Voltage changes Lx to “H” level V

OUT

Voltage changes Lx to “L” level

When connected to external components, I

(*6)

, Voltage which oscillation frequency becomes 1020

kHz

When connected to external components, I

(*6)

, Voltage which oscillation frequency becomes f

1020kHz

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

When connected to external components, V

CE

When connected to external components, V

CE

VIN=VCE=5.0V, V Short Lx at 1 Sweeping V 1

Ω

level within 1ms

V

IN=VCE

decreasing V

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

OUT(E)

because those are only for the PFM control’s functions.

LIMIT_PFM

and V

because those are only for the XC9237 series’ functions.

PWML

+2.0V, VCE=1.0V,

=VIN, V

OUT=VOUT(E)

=5.0V, V

OUT=VOUT(E)

+2.0V, VCE =1.0V, I

+2.0V, VCE =VIN, I

=(C-1), I

=5.0V, V

=1mA

OUT

OUT=VOUT(E)

+1.2V, I

OUT (E)

(*4)

- 0.45 0.65 Ω ④

(*4)

=5.0V, VCE=0V, Lx=0V - 0.01 1.0 μA ⑤

OUT

=5.0V, V

OUT=VOUT(E)

(*14)

×0.5V

×1.1V - 15 33 μA ②

×1.1V - 0 1.0 μA ②

=100mA

OUT

=1mA

OUT

(*12)

200 300 % ①

×0.9V 100 - - % ③ ×1.1V - - 0 % ③

=100mA

OUT

×0.9V , ILx=100mA ×0.9V , ILx=100mA

×0.9V

(*9)

(*1, *11)

(*12)

(*3)

- 0.35 0.55 Ω ④

(*3)

- 0.42 0.67 Ω ④

(*8)

900 1050 1350 mA ⑥

600 - - mA ①

1.00 1.40 1.78 V ③

1020 1200 1380 kHz ①

120 160 200 mA ①

- 92 - % ①

- 0.52 0.77 Ω -

=30mA, -40℃≦Topr≦85℃ - ±100 -

=

V

×0.9V, Applied voltage to VCE,

OUT(E)

=

V

×0.9V, Applied voltage to VCE ,

OUT(E)

≦

f

≦

1380kHz

OSC

(*13)

=0V → VIN, I

resistance, V

=5.0V, The V

=Nominal Voltage, applied voltage sequence is V

(*13)

V

=

V

OUT

OUT(E)

V

=

OUT

=1mA

OUT

=1mA

OUT

=0.8×V

OUT

Ω

resistance

, VIN=VCE=5.0V, Short Lx at

OUT

voltage which Lx becomes “L”

OUT

from

V

OUT

minus 1.0V and equal to or greater than V

IN

(*11)

=1mA

OUT

=1mA

OUT

×0.9V - 0.1 - 0.1 μA ⑤

V

×0.9V - 0.1 - 0.1 μA ⑤

OUT(E)

,

OUT(E) (*7)

at Lx=”Low"

×0.4V

(E)

(*11)

while

=open 200 300 450 Ω ⑧

OUT

0.65 - 6.0 V ③

- 0.25 V ③

V

SS

- - V

–

V

IN

＜

OSC

0.25

- 0.25 0.40 ms ①

0.5 1.0 2.5 ms ①

1.0 - 20.0 ms ⑦

0.675 0.900 1.150 V ⑦

0.338 0.450 0.563 V ⑦

CEH

.

OUT→VIN→VCE

- - V ①

V ①

ppm/

- 1.0 V ①

IN

minus 0.3V, and to the PWM

IN

℃

Series

CIRCUIT

①

7/33

XC9235/XC9236/XC9237

■ELECTRICAL CHARACTERISTICS (Continued)

XC9237B(C)(E)(G)18Dxx, V

OUT

=1.8V, f

=3.0MHz, Ta=25℃

OSC

Series

PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNIT

Output Voltage V

Operating Voltage Range (B/C series)

Operating Voltage Range (E/G series)

Maximum Output Current I

UVLO Voltage V

OUT

VIN

OUTMAX

UVLO

Supply Current IDD V

Stand-by Current I

Oscillation Frequency f

PFM Switching Current I

PFM Duty Limit

Maximum Duty Cycle

Minimum Duty Cycle

DTY

STB

OSC

PFM

LIMIT_PFM

DTY

Efficiency EFFI

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" Leak Current

Current Limit

(*5)

I

(*10)

I

Output Voltage

Temperature Characteristics

CE "H" Voltage V

CE "L" Voltage V

PWM "H" Level Voltage V

PWM "L" Level Voltage V

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

(V

LeakH

LIM

△V

・△Topr)

OUT

CEH

CEL

PWMH

PWML

CEH

CEL

LxH

LxL

OUT

Soft Start Time (B/G Series) tSS

Soft Start Time (C/E Series) tSS

Latch Time t

Short Protection Threshold

Voltage (B/C Series)

Short Protection Threshold

Voltage (E/G Series)

CL Discharge R

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)= (V *4: R&D value *5: When temperature is high, a current of approximately 10μA (maximum) may leak. *6: The CE/MODE pin of the XC9237A 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

mode when the CE/MODE pin voltage is equal to or lower than V *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.

*11: “H”=V *12: XC9235 series exclude I *13: XC9235/9236 series exclude V

*14: V

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

IN

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

-1.2V, “L”=+0.1V~-0.1V

IN~VIN

is applied when V

IN

- Lx pin measurement voltage) / 100mA

IN

OUT (E)

LAT

V

SHORT

V

SHORT

DCHG

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

OUT

and DTY

PFM

PWMH

x 0.5V becomes more than VIN.

When connected to external components, V

IN=VCE

=5.0V, I

OUT

=30mA

2.0 - 6.0

1.8 - 6.0 V

IN=VOUT(E)

When connected to external components V

CE=VIN

Voltage which Lx pin holding “L” level

IN=VCE

VIN=5.0V, VCE=0V, V

When connected to external components, V

IN=VOUT(E)

When connected to external components, V

IN=VOUT(E)

V

CE=VIN

V

MAX

MIN

IN=VCE

V

IN=VCE

+2.0V, VCE=1.0V,

, V

OUT=VOUT(E)

=5.0V, V

×0.5V

OUT=VOUT(E)

+2.0V, VCE=1.0V, I

+2.0V, VCE=VIN, I

=(C-1), I

=5.0V, V

=1mA

OUT

OUT=VOUT(E)

(*9)

(*14)

,

(*1,*11)

×1.1V - 21 35 μA ②

×1.1V - 0 1.0 μA ②

=100mA

OUT

(*12)

=1mA

OUT

(*12)

- 200 300 % ①

×0.9V 100 - - % ③ ×0.1V - - 0 % ③

When connected to external components, V

CE=VIN＝VOUT(E)

VIN=VCE=5.0V, V

VIN=VCE=3.6V, V

VIN=VCE=5.0V

VIN=VCE=3.6V

VIN=V

OUT

VIN=VCE=5.0V, V

/

I

=30mA, -40℃≦Topr≦85℃ - ±100 -

OUT

V

=

V

OUT

OUT(E)

Voltage changes Lx to “H” level V

=

V

OUT

OUT(E)

Voltage changes Lx to “L” level

When connected to external components, I

=1mA

OUT

becomes 2550kHz≦f

When connected to external components, I

=1mA

OUT

becomes f

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

+1.2V, I

OUT

(*4)

=5.0V, VCE=0V, Lx=0V - 0.01 1.0 μA ⑤

OUT=VOUT(E)

×0.9V, Applied voltage to VCE,

(*6)

, Voltage which oscillation frequency

(*6)

, Voltage which oscillation frequency

＜2550kHz

OSC

V

OUT

=100mA

OUT

=

V

×0.9V, ILx=100mA

OUT(E)

=

V

×0.9V, ILx=100mA

OUT(E)

(*8)

×0.9V

≦3450kHz

OSC

(*13)

=

V

×0.9V - 0.1 - 0.1 μA ⑤

OUT(E)

V

=

V

OUT

OUT(E)

900 1050 1350 mA ⑥

(*11)

(*13)

×0.9V - 0.1 - 0.1 μA ⑤

When connected to external components, V

=0V → VIN, I

CE

OUT

=1mA

When connected to external components, V

=0V → VIN, I

CE

VIN=VCE=5.0V, V Short Lx at 1

Sweeping V 1

Ω

resistance, V

level within 1ms

V

=5.0V, The V

IN=VCE

decreasing V

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

=Nominal Voltage, applied voltage sequence is V

OUT(E)

because those are only for the PFM control’s functions.

LIMIT_PFM

and V

because those are only for the XC9237 series’ functions.

PWML

=1mA

OUT

=0.8×V

OUT

Ω

resistance

, VIN=VCE=5.0V, Short Lx at

OUT

voltage which Lx becomes “L”

OUT

from

V

OUT

minus 1.0V and equal to or greater than V

IN

OUT(E)

(*7)

at Lx=”Low"

×0.4V

OUT

(E)

,

(*11)

=open 200 300 450 Ω ⑧

OUT

while

1.764 1.800 1.836 V ①

V ①

600 - - mA ①

1.00 1.40 1.78 V ③

2550 3000 3450 kHz ①

170 220 270 mA ①

- 86 - % ①

(*3)

- 0.35 0.55 Ω ④

(*3)

- 0.42 0.67 Ω ④

- 0.45 0.65 Ω -

- 0.52 0.77 Ω -

ppm/

℃

0.65 - 6.0 V ③

- 0.25 V ③

V

SS

- - V

–

V

IN

0.25

- 1.0 V ①

IN

- - V ①

- 0.32 0.50 ms ①

0.5 0.9 2.5 ms ①

1.0 - 20 ms ⑦

0.675 0.900 1.150 V ⑦

0.338 0.450 0.563 V ⑦

CEH

minus 0.3V, and to the PWM

.

IN

OUT→VIN→VCE

CIRCUIT

①

8/33

■ELECTRICAL CHARACTERISTICS (Continued)

●XC9237D(F)08Cxx, FB Type, f

=1.2MHz, Ta=25℃

OSC

XC9235/XC9236/XC9237

Series

PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNIT

FB Voltage VFB

= VCE =5.0V, The VFB at Lx=”High"

V

IN

decreasing FB pin voltage from 0.9V.

(*11)

while

0.784 0.800 0.816 V ③

Operating Voltage Range VIN 1.8 - 6.0 V ①

=3.2V, VCE=1.0V

V

Maximum Output Current I

UVLO Voltage V

OUTMAX

UVLO

Supply Current IDD V

Stand-by Current I

Oscillation Frequency f

PFM Switching Current I

PFM Duty Limit

Maximum Duty Cycle

Minimum Duty Cycle

Efficiency

(*2)

EFFI

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" Leak Current

Current Limit

(*5)

ILeakH VIN = VFB = 5.0V, VCE = 0V, LX= 0V - 0.01 1.0 μA ⑨

(*10)

I

Output Voltage

Temperature Characteristics

CE "H" Voltage V

CE "L" Voltage V

PWM "H" Level Voltage V

PWM "L" Level Voltage V

CE "H" Current I

CE "L" Current I Soft Start Time (D series) 0.5 1.0 2.5 Soft Start Time (F series)

Latch Time t

Short Protection Threshold

Voltage

V

STB

OSC

PFM

DTY

LIMIT_PFM

DTY

MAX

DTY

MIN

LｘH

LｘL

V

LIM

△

V

OUT

(V

・△

OUT

CEH

CEL

PWMH

PWML

V

CEH

V

CEL

t

SS

LAT

V

SHORT

V

V V V

/

Topr)

IN

When connected to external components

=

VIN ,

V Voltage which Lx pin holding “L” level

VFB = 0.4V,

CE

=VCE=5.0V, VFB= 0.88V - 15 μA ②

IN

=5.0V, VCE=0V, VFB= 0.88V - 0 1.0 μA ②

IN

When connected to external components, V

= 3.2V, VCE=1.0V, I

IN

=100mA

OUT

When connected to external components, V

=3.2V, VCE = VIN , I

IN

= VIN =2.0V I

V

CE

V

= VCE =5.0V, VFB = 0.72V 100 - - % ③

IN

V

= VCE =5.0V, VFB = 0.88V - - 0 % ③

IN

OUT

=1mA

(*12)

200 300 % ①

When connected to external components, V

= VIN ＝ 2.4V, I

CE

= VCE = 5.0V, VFB = 0.72V,ILX = 100mA

IN

= VCE = 3.6V, VFB = 0.72V,ILX = 100mA

IN

= VCE = 5.0V

IN

= VCE = 3.6V

IN

= VCE= 5.0V, VFB = 0.72V

IN

I

=30mA

OUT

-40℃≦Topr≦85℃

=0.72V, Applied voltage to VCE,

V

FB

Voltage changes Lx to “H” level

=0.72V, Applied voltage to VCE,

V

FB

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

OUT

frequency becomes 1020kHz≦f

(*13)

When connected to external components, I

OUT

frequency becomes f

(*6)

=1mA

, Voltage which oscillation

(*6)

=1mA

= VCE =5.0V, VFB =0.72V - 0.1 - 0.1 μA ⑤

IN

=5.0V, VCE = 0V, VFB =0.72V - 0.1 - 0.1 μA ⑤

IN

, Voltage which oscillation

= 100mA

OUT

(*4)

- 0.45 0.65 Ω -

(*4)

- 0.52 0.77 Ω -

＜1020kHz

OSC

When connected to external components, V

= 0V → VIN , I

CE

=

VCE=5.0V,

V

IN

resistance

= VCE =5.0V, The VFB at Lx=”Low"

V

IN

decreasing FB pin voltage from 0.4V.

VFB=0.64,

(*7)

=1mA

OUT

Short Lx at 1Ω

600 - - mA ①

1.00 1.40 1.78 V ③

(*1,*11)

(*9)

1020 1200 1380 kHz ①

(*12)

120 160 200 mA ①

- 92 - % ①

(*3)

- 0.35 0.55 Ω ④

(*3)

- 0.42 0.67 Ω ④

(*8)

900 1050 1350 mA ⑥

- ±100 - ppm/ ℃ ①

(*11)

≦1380kHz

OSC

(*13)

0.65 - 6.0 V ③

V

SS

- - V

V

IN

0.25

- 0.25 0.40

- 0.25 V ③

- 1.0 V ①

IN

-

- - V ①

ms ①

1.0 - 20.0 ms ⑦

(*11)

while

0.15 0.200 0.25 V ⑦

CIRCUIT

CL Discharge R

Test conditions: V V

OUT→VIN→VCE

NOTE:

*1: Including hysteresis operating voltage range. *2: EFFI = { ( output voltage×output current ) / ( input voltage×input current) }×100 *3: ON resistance (Ω)= (V *4: R&D value

*5: When temperature is high, a current of approximately 10μA (maximum) may leak. *6: The CE/MODE pin of the XC9237A 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

mode when the CE/MODE pin voltage is equal to or lower than V *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.

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 *12: XC9235 series exclude I

*13: XC9235/9236 series exclude V

=1.2V when the external components are connected. Unless otherwise stated, VIN=5.0V, V

OUT

- Lx pin measurement voltage) / 100mA

IN

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

IN

-1.2V, “L”=+0.1V~-0.1V

IN~VIN

FB

PFM

VIN = 5.0V ,LX = 5.0V, VCE = 0V, VFB= open 200 300 450 Ω ⑧

DCHG

=Nominal Voltage, applied voltage sequence is

OUT(E)

minus 0.3V, and to the PWM

minus 1.0V and equal to or greater than V

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

and DTY

PWMH

because those are only for the PFM control’s functions.

LIMIT_PFM

and V

because those are only for the XC9237 series’ functions.

PWML

IN

CEH

.

IN

9/33

XC9235/XC9236/XC9237

Series

■ELECTRICAL CHARACTERISTICS (Continued)

●XC9237D(F)08Dxx, FB, f

PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNIT

FB Voltage

Operating Voltage Range

Maximum Output Current

UVLO Voltage

Supply Current

Stand-by Current

Oscillation Frequency

PFM Switching Current

PFM Duty Limit

Maximum Duty Cycle

Minimum Duty Cycle

Voltage

(*2)

(*10)

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" Leak Current

Current Limit

Output Voltage

Temperature Characteristics

CE "H" Voltage

CE "L" Voltage

PWM "H" Level Voltage

PWM "L" Level Voltage

CE "H" Current

CE "L" Current Soft Start Time (D series) Soft Start Time (F series)

Latch Time

Short Protection Threshold

=3.0MHz, Ta=25℃

OSC

V

FB

V

IN

I

OUTMAX

V

UVLO

I

DD

I

STB

f

OSC

I

PFM

DTY

LIMIT_PFM

DTY

EFFI

R

LｘH

R

LｘH

R

LｘL

R

(*5)

LｘL

ILeakH V

I

LIM

△

V

OUT

(V

・△

OUT

V

CEH

V

CEL

V

PWMH

V

PWML

I

CEH

I

CEL

t

SS

t

LAT

V

SHORT

V

= VCE =5.0V, The VFB at Lx=”High"

IN

decreasing FB pin voltage from 0.9V.

(*11)

while

1.8 - 6.0 V ①

V

=3.2V, VCE=1.0V

IN

When connected to external components

V

=

VIN ,

VFB = 0.4V ,

V

MAX

MIN

CE

Voltage which Lx pin holding “L” level

=VCE=5.0V, VFB= 0.88V - 21 35 μA ②

IN

=5.0V, VCE=0V, VFB= 0.88V - 0 1.0 μA ②

IN

When connected to external components,

= 3.2V, VCE=1.0V, I

V

IN

When connected to external components,

=3.2V, VCE = VIN , I

V

IN

VCE= VIN =2.2V I

OUT

=1mA

=100mA

(*12)

=1mA

(*12)

200 300 % ①

VIN = VCE =5.0V, VFB = 0.72V 100 - - % ③

VIN = VCE =5.0V, VFB = 0.88V - - 0 % ③

(*9)

(*1, *11)

When connected to external components, V

= VIN ＝ 2.4V, I V V

V V

V

/

Topr)

CE

= VCE = 5.0V, VFB = 0.72V,ILX = 100mA

IN

= VCE = 3.6V, VFB = 0.72V,ILX = 100mA

IN

= VCE = 5.0V

IN

= VCE = 3.6V

IN

= VFB = 5.0V, VCE = 0V, LX= 0V - 0.01 1.0 μA ⑨

IN

= VCE= 5.0V, VFB = 0.72V

IN

I

=30mA

OUT

-40℃≦Topr≦85℃ V

=0.72V , V

FB

Voltage changes Lx to “H” level V

=0.72V, VCE,

FB

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

= 1mA

OUT

becomes

When connected to external components, I

= 1mA

OUT

becomes V V

= VCE =5.0V, VFB =0.72V - 0.1 - 0.1 μA ⑤

IN

=5.0V, VCE = 0V, VFB =0.72V - 0.1 - 0.1 μA ⑤

IN

When connected to external components, V

= 0V → VIN , I

CE

V

= VCE

IN

Short Lx at 1

V

= VCE =5.0V, The VFB at Lx=”Low"

IN

decreasing FB pin voltage from 0.4V.

(*6)

, Voltage which oscillation frequency

2550kHz≦f

(*6)

, Voltage which oscillation frequency

f

＜2550kHz

OSC

= 5.0V,

Ω

resistance

= 100mA

OUT

(*4)

- 0.45 0.65 Ω -

(*4)

- 0.52 0.77 Ω -

(*8)

900 1050 1350 mA ⑥

CE,

OSC

=1mA

OUT

VFB = 0.64,

(*11)

≦3450kHz

(*13)

(*7)

(*13)

(*11)

(*3)

while

CIRCUIT

0.784 0.800 0.816 V ③

600 - - mA ①

1.00 1.40 1.78 V ③

2550 3000 3450 kHz ①

170 220 270 mA ①

- 86 - % ①

- 0.35 0.55 Ω ④

- 0.42 0.67 Ω ④

- ±100 - ppm/ ℃ ①

0.65 - 6.0 V ③

V

SS

- - V

V

IN

0.25

0.5 1.0 2.5

- 0.25 0.40

- 0.25 V ③

- 1.0 V ①

IN

-

- - V ①

ms ①

1.0 - 20.0 ms ⑦

0.15 0.200 0.25 V ⑦

CL Discharge

Test conditions: V V

OUT→VIN→VCE

NOTE:

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

*3: ON resistance (Ω)= (V *4: R&D value *5: When temperature is high, a current of approximately 10μA (maximum) may leak. *6: The CE/MODE pin of the XC9237A 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

mode when the CE/MODE pin voltage is equal to or lower than V *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.

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 *12: XC9235 series exclude I *13: XC9235/9236 series exclude V

=1.2V when the external components are connected. Unless otherwise stated, VIN=5.0V, V

OUT

- Lx pin measurement voltage) / 100mA

IN

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

IN

-1.2V, “L”=+0.1V~-0.1V

IN~VIN

FB

PFM

VIN = 5.0V ,LX = 5.0V ,VCE = 0V ,VFB= open 200 300 450 Ω ⑧

R

DCHG

=Nominal Voltage, applied voltage sequence is

OUT(E)

minus 0.3V, and to the PWM

minus 1.0V and equal to or greater than V

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

and DTY

PWMH

because those are only for the PFM control’s functions.

LIMIT_PFM

and V

because those are only for the XC9237 series’ functions.

PWML

IN

CEH

.

IN

10/33

TOREX XC9235, XC9236, XC9237 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual