TOREX XC6371, XC6372, XC6373 User Manual

XC6371/XC6372/XC6373

Series

ETR0402_002

PWM Controlled Step - Up DC/DC Contorollers/Convereters

■GENERAL DESCRIPTION

The XC6371/6372/6373 series are a group of PWM controlled and PWM/PFM controlled step-up DC/DC converters. The
built-in 1.4Ω switching transistor type enables a step-up circuit to be configured using only three components, a coil, a diode,
and a capacitor.
Output voltage can be selectable in the range from 2.0V to 7.0V in increments of 100mV (accuracy:±2.5%). Oscillation
frequency is also selectable from 50kHz, 100kHz, and 180kHz (accuracy:±15%) for the XC6371 and the XC6372 series.
Soft-start time is internally set and offers protection against in-rush currents when the power is switched on and prevents
voltage overshoot. 5 pin packages, which are provided with either a CE (chip enable) function that reduces power
consumption during shut-down mode, or a V
The XC6371 series is the standard PWM controlled products. The control of the XC6372 series switches from PWM to PFM
control during light loads when automatically switching is selected and the series is highly efficient from light loads to large
output currents. Since the XC6373 series is a low noise, it is suitable for a wireless circuit. Also the series is particularly
suited for use with pager applications because oscillation frequency is set at 30kHz (±20%) so as to attain the lowest
consumption current possible.

■APPLICATIONS

●Cellular phones, Pagers

●Palmtops

●Cameras, Video recorders

●Portable products

■

TYPICAL APPLICATION CIRCUIT

DD pin (separated power and voltage detect pins) are available.

■FEATURES

Operation Start Voltage Range
Output Voltage Range :
Highly Accurate : Setting voltage accuracy±2.5%
Oscillation Frequency :

selectable (XC6371/72)
30kHz (XC6373)

Maximum Output Currents (Tr. built-in)

:

Highly Efficient (Tr. built-in)

Built-in switching transistor type.
Five-lead packaged units offer either chip enable or
independent V
Phase compensation and soft start-up circuits built-in.
CMOS Low Power Consumption
Small Packages : SOT-89, SOT-89-5,USP-6B

*: Performance depends on external components and

PCB layout.

OUT pin option.

: 0.9V~10V

50kHz, 100kHz, 180kHz (±15%)

100mA(TYP.) @ VIN=3.0V, V

:

85%(TYP.) @ VIN=3.0V, V

■TYPICAL PERFORMANCE

☆GO-Compatible

2.0V~7.0V in 100mV increments

OUT

=5.0V *

OUT

=5.0V *

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XC6371/XC6372/XC6373

■PIN CONFIGURATION

Series

■PIN ASSIGNMENT

XC6371/72/73A

PIN NUMBER

SOT-89 USP-6B

PIN NAME FUNCTION

*The dissipation pad for the USP-6B
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 to other pins, it should be
connected to the pin No.1.

1 6 VSS Ground

2 1 VOUT

Output Voltage Monitor/IC Internal Power Supply

3 4 Lx Switch

－

XC6371/72/73C

SOT-89-5 USP-6B

PIN NUMBER

2, 3, 5 NC No Connection

PIN NAME FUNCTION

5 6 VSS Ground

2 1 VOUT Output Voltage Monitor/IC Internal Power Supply

4 4 Lx Switch

3 3 CE Chip Enable

1 2, 5 NC No Connection

XC6371/72/73E

PIN NUMBER

SOT-89-5 USP-6B

PIN NAME FUNCTION

5 6 VSS Ground

2 1 VDD IC Internal Power Supply

4 4 Lx Switch

3 3 VOUT Output Voltage Monitor

1 2, 5 NC No Connection

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■PRODUCT CLASSIFICATION

●Selection Guide

START

PWM

XC6371

Low Frequency PWM XC6373

PWM/PFM

Standard

Chip Enable

Separated

V

DD/VOUT

Standard

Chip Enable

Separated

V

DD/VOUT

●Ordering Information

XC6371①②③④⑤⑥ : PWM controlled
XC6372①②③④⑤⑥

XC6371 Series

DESIGNATOR DESCRIPTION SYMBOL DESCRIPTION

①

: PWM/PFM switching control

Type of

DC/DC Converter

A : 3-pin DC/DC converter with built-in switching transistor

C : Stand-by capability with built-in switching transistor
E : Separated VDD and VOUT with built-in switching transistor

XC6371/XC6372/XC6373

Series

XC6371/73A

XC6371/73C

XC6371/73E

XC6372A

XC6372C

XC6372E

② ③

④

⑤

⑥

Output Voltage Integer

Oscillation Frequency

Package

Device Orientation

XC6373①②③④⑤⑥ : PWM controlled

DESIGNATOR

①

②
③

④

⑤

⑥

DESCRIPTION

Type of

DC/DC Converter

Output Voltage Integer

Oscillation Frequency 0

Package

Device Orientation

OUT=3.5V→②=3, ③=5

: e.g. V

0 : 50kHz

1 : 100kHz
2 : 180kHz

P

: SOT-89 (XC6371/72 A type)

: SOT-89-5 (XC6371/72 C/D type)
D : USP-6B

R : Embossed tape, standard feed

L : Embossed tape, reverse feed

SYMBOL

A

: 3-pin DC/DC converter with built-in switching transistor

DESCRIPTION

C : Stand-by capability with built-in switching transistor
E : Separated V

: e.g. V

DD and VOUT with built-in switching transistor

OUT=3.5V→②=3, ③=5

: 30kHz

P

D

R

L

: SOT-89 (XC6373 A type)

: SOT-89-5 (XC6373 C/D type)

: USP-6B

: Embossed tape, standard feed

: Embossed tape, reverse feed

3/19

(p)

XC6371/XC6372/XC6373

■BLOCK DIAGRAMS

XC6371/72/73A, C

■ABSOLUTE MAXIMUM RATINGS

OUT pin serves also as VDD)

(The V

Lx

VLx limi ter

Buffer

V

SS

EXT

Note: The CE pin is only used with the XC6371C.

PWM Control

OSC 50/100/180KHz

Chip Enable

CE

XC6371/72/73E

Lx

VLx limi ter

Buffer

V

SS

EXT

Note: Built-in transistor type units use the Lx pin.

PWM Control

OSC 50/100/180KHz

PAR AMETER SYMBOL RATINGS UNITS

VOUT Input Voltage VOUT 12 V

LX pin Voltage VLX 12 V

LX pin Current ILX 400 mA

CE Input Voltage VCE 12 V

Power Dissipation

SOT-89, 89-5 500

USP-6B

VDD Input Voltage VDD 12 V

Operating Temperature Range Topr

Storage Temperature Range Tstg

Soft Start

Vref

Phase comp

+

－

Soft Start

Vref

Phase comp

+

－

Pd

Series

DD

V

V

DD

V

OUT

V

DD

V

OUT

Ta =2 5℃

100

mW

-30~＋80 ℃

-40~＋125 ℃

4/19

,

XC6371/XC6372/XC6373

Series

■ELECTRICAL CHARACTERISTICS

XC6371/72A501PR

PAR AMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNITS

Output Voltage VOUT 4.875 5.000 5.125 V
Maximum Input Voltage VIN 10 - - V
Operation Start Voltage VST1 External Components Connected, IOUT=1mA - - 0.90 V

Oscillation Start Voltage VST2

No Load Input Current IIN

Supply Current 1 IDD1

Supply Current 2 IDD2

Lx Switch-On

Resistance

Lx Leak Current ILXL No external components. VOUT=VLX=10V - - 1.0

Oscillation Frequency FOSC Same as IDD1. Measuring of Lx waveform 85 100 115 kHz

Maximum Duty Ratio MAXDTY Same as IDD1. Measuring of Lx waveform 80 87 92 %

PFM Duty Ratio (*4) PFMDTY Same as IDD1. Measuring of Lx waveform 10 17 25 %

Lx Limit Voltage VLXLMT

Efficiency EFFI - 85 - %

Slow-Start Time TSS 4.0 10.0 20.0 mS

NOTE: Unless otherwise stated, VIN=VOUT×0.6, IOUT=50mA. See Typical Application Circuits, Circuit1

*1: The Schottky diode (SD) must be type MA735, with reverse current (IR)<1.0μA at reverse voltage (VR)=10.0V.(XC6372A)
*2: "Supply Current 1" is the supply current while the oscillator is continuously oscillating. In actual operation the oscillator periodically

operates which results in less average power consumption. The current actually provided by an external V
"No Load Input Current (I

*3: When PWM operates at PWM Mode.
*4: When PFM operates at PFM Mode.(XC6372A)

OUT=5.0V

V

RSWON Same as IDD1, VLX=0.4V - 1.4 2.4

FOSC=100kHZ

No external components. Apply voltage to VOUT

Lx : 10kΩ pull-up to 5V

IN=VOUT×0.8, IOUT=0mA (*1)

V

Same as VST2,

Apply output voltage×0.95 to VOUT

Same as VST2,

Apply output voltage×1.1 to V

OUT

Ta =2 5℃

- - 0.80 V

- 12.8 25.7

- 80.2 133.8

- 8.2 16.5

μA

μA

μA

Ω

μA

Same as IDD1. Apply output voltage to Lx,

Voltage required to produce FOSC×2

IN)".

0.7 - 1.3 V

IN source is represented by

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)

XC6371/XC6372/XC6373

■ELECTRICAL CHARACTERISTICS (Continued

V

XC6371/72C501PR

OUT=5.0V, FOSC=100kHz Ta=25℃

Series

PAR AMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNITS

Output Voltage VOUT 4.875 5.000 5.125 V
Maximum Input Voltage VIN 10 - - V
Operation Start Voltage VST1 External Components Connected, IOUT=1mA - - 0.90 V

Operation Start Voltage VST2

No Load Input Current IIN

Supply Current 1 IDD1

Supply Current 2 IDD2

Lx Switch-On

Resistance

R

SWON Same as IDD1, VLx=0.4V - 1.4 2.4

Lx Leak Current ILXL No external components, VOUT =VLX=10V - - 1.0

No external components. Apply voltage to VOUT,

Lx : 10kΩ pull-up to 5V

IN=VOUT×0.8, IOUT=0mA (*1)

V

Same as VST2,

Apply output voltage×0.95 to VOUT

Same as V

Apply output voltage×1.1 to V

ST2,

OUT

- - 0.80 V

- 12.8 25.7

- 80.2 133.8

- 8.2 16.5

μA

μA

μA

Ω

μA

Oscillation Frequency FOSC Same as IDD1, Measuring of Lx waveform 85 100 115 kHZ

Maximum Duty Ratio MAXDTY Same as IDD1, Measuring of Lx waveform 80 87 92 %

PFM Duty Ratio (*4) PFMDTY Same as IDD1, Measuring of Lx waveform 10 17 25 %

Stand-by Current ISTB Same as IDD1 - - 0.5

μA

CE "High" Voltage VCEH Same as IDD1, Lx Oscillation start 0.75 - - V
CE "Low" Voltage VCEL Same as IDD1, Lx Oscillation stop - - 0.20 V
CE "High" Current ICEH

Same as I

DD1, VCE=VOUT×0.95

CE "Low" Current ICEL Same as IDD1, VCE=0V - - -0.25

Lx Limit Voltage VLxLMT

Same as IDD1, Apply output voltage to Lx,

Voltage required to produce FOSC×2

- - 0.25

μA
μA

0.7 - 1.3 V

Efficiency EFFI - 85 - %

Slow-Start Time TSS 4.0 10.0 20.0 ms

NOTE: Unless otherwise stated, connect CE to VOUT, VIN=VOUT×0.6, IOUT=50mA. See Typical Application Circuits, Circuit 2.

*1: The Schottky diode (SD) must be type MA735, with reverse current (I

*2: "Supply Current 1" is the supply current while the oscillator is continuously oscillating. In actual operation the oscillator periodically

operates which results in less average power consumption. The current actually provided by an external VIN source is represented by

"No Load Input Current (I

*3: When PWM operates at PWM Mode.

*4: When PFM operates at PFM Mode.(XC6372C)

IN)".

R)<1.0μA at reverse voltage (VR)=10.0V.(XC6372C)

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