GM3326-4.0ST25R datasheet(1/7 Pages) GAMMA

Part #	GM3326-4.0ST25R

Description	PWM,PWM/PFM SWITCHING STEP-UP & DOWN DC/DC CONVERTER CONTROLLER ICS

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Manufacturer	GAMMA [Gamma Microelectronics Inc.]

Direct Link	http://www.gammamicro.com.tw/

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Description

GM3326 is step-up/down DC/DC converter controller ICs

with fast, and low ON resistance drivers built-in. A versatile

step-up/ down DC/DC converter can be realised by using

with large output current only 4 basic external components

- transistors, coils, diodes, and capacitors.

Output voltage is selectable in 0.1V steps within a 2.4V ~

6.0V ( ± 2.5% accuracy) range, and switching frequency is

set at or 300KHz.

GM3326 switches from PWM to PFM control during light

loads, and the series offers high efficiencies from light

loads through to large output currents.

Soft-start time is internally set to 10 msec, which offers

protection against rush currents when the power is

switched on and also against voltage overshoot.

During shutdown (CE pin = L), consumption current can be

reduced to as little as 0.5µA or less.

Application

Mobile phones

PDAs

Palmtop computers

TYPICAL APPLICATION CIRCUITS

Features

Input Voltage Range : 2.0V ~ 10V

Output Voltage Range : 2.4V ~ 6.0V ( ± 2.5%

accuracy) (selectable in 0.1V steps)

Oscillation Frequency : 300KHz ( ± 15%

accuracy)

Output Current : more than 250mA (V =2.4V,

IN

V

=3.3V)

OUT

Efficiency : 81% (typ) at 5.0V, 78% (typ) at 3.3V

Stand-By : ISTB = 0.5µA (max)

Output Voltage Internal Set-Up

SOT-25 Package

1

www.gammamicro.com

Portable audio equipment

Various power supplies

CIN

+

CL

VOUT

VIN

3L colis SMTSPR5D5047C-220

Youth coils YCDH57-220

Nch

FDN339AN

MOSFET

CE

Pch MOSFET

FDN338P

GM3326

V

OUT

Schottky

MBRS140

Schottky

MBRS140

EXT

V

DD

GND

L

68µF/ 10V

Chemi_con

PT- Series

100µF/ 10V

Chemi_con

PT- Series

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GM3326-4.0ST25R Datasheet(PDF) 1 Page - Gamma Microelectronics Inc.

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