GM7109-3.3PS8R GAMMA [Gamma Microelectronics Inc.], GM7109-3.3PS8R Datasheet

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GM7109-3.3PS8R

Manufacturer Part Number

GM7109-3.3PS8R

Description

150KHz, 2A STEP DOWN VOLTAGE SWITCHING REGULATORS

Manufacturer

GAMMA [Gamma Microelectronics Inc.]

Datasheet

1.GM7109-3.3PS8R.pdf (9 pages)

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Application

Description

Pre-regulator for linear regulators

High-efficiency step-down buck regulator

Typical Application Circuits

GM7109 series is designed to provide all the

active function for a

regulator, and drives a maximum load current as

high as 2A

available in fixed output voltages of 3.3V, 5V,

and a versatile Adjustable output version.

These regulators are simple to use and require

minimum number of external components. The

features include internal frequency compensation

and a fixed-frequency oscillator.

The GM7109 is high-efficiency replacements for

popular

requiring a smaller heat sink or even no need

heat sink.

GM7109 performs well with standard inductors

from most

design of

shutdown is included with 80 µA (typical) standby

current. The output switch has cycle-by-cycle

current limiting as well as thermal shutdown for

full protection under fault conditions.

GM7109 operates at a switching frequency of

150 kHz which

components than what would be needed with

lower frequency switching regulators.

GM7109 series are available in a standard 8-lead

SO package or 8 lead SO package with heat

sink.

three-terminal linear regulators, and is

switch-mode power supplies.

of manufacturers, and simplifying the

line and load regulations. GM7109 is

allowing smaller size filter

1

Unregulated

DC Input

step-down (buck) switching

680µF

C

IN

1

GM7109-5.0

V

IN

SD

External

4

GND

Output

On-card/board switching regulators

Positive to negative converter (buck-boost)

LCD Monitors

5, 6, 7, 8

FB

Features

3

2

Standard SOP8 & PSOP8 package

3.3V, 5V, and Adjustable output versions

Adjustable version output voltage range

1.23V to 37V

V

input voltage the output load conditions

Input voltage range up to 40V

Requires only 4 external components with

High efficiency

TTL shutdown capability, low power

standby mode

Built-in thermal shutdown, current limit

protection

Uses standard inductors

150 kHz fixed frequency internal oscillator

150KHz, 2A STEP DOWN VOLTAGE

OUT

D1

1N5824

accuracy is to

68µH

L1

SWITCHING REGULATORS

C

220µF

5V

regulated

outpu

OUT

www.gammamicro.com.tw

±

t,

2% under specified

GM7109

1

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