CM3718 查看數據表（PDF） - Unspecified

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CM3718

1.5A LOW-NOISE PWM STEP-DOWN REGULATOR

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CM3718

1.5A LOW-NOISE PWM STEP-DOWN REGULATOR

GENERAL DESCRIPTION

FEATURES

The CM3718 is a low-noise, pulse-width-modulated (PWM),

DC-DC step-down converter. It powers logic and transmitters

in small wireless systems such as cellular phones,

communicating PDAs, and handy-terminals. The device

features an internal synchronous rectifier for high efficiency; it

requires no external Schottky diode. Excellent noise

characteristics and fixed-frequency operation provide easy

post-filtering. The CM3718 is ideally suited for Li-lon battery

applications. It is also useful for +3V or +5V fixed input

applications.

The device operates in one of four modes. Forced PWM

mode operates at a fixed frequency regardless of the load.

Shutdown mode places the device in standby, reducing

quiescent supply current to under 0.1µA.

Patent Number #6,452,366

1.2MHz switching and synchronization

Dynamic output-voltage adjustment from VREF to VIN

1.5A Guaranteed Output Current

95% Efficiency

No Schottky Diode Required

External Soft Start

8-pin PSOP power packages

The CM3718 can deliver over 1.5A. The output voltage can be

adjusted from VREF to VIN. The input range is from 2.0V to

5.0V. Other features of the CM3718 include high efficiency,

low dropout voltage. It is available in a space-saving 8-pin

SOP package.

APPLICATIONS

Cellular Phone

Cordless Phone

PDAs and Handy-Terminals

CPU I/O Supplies

Notebook Chipset Supplies

Battery Operated Devices

PIN CONFIGURATION

PSOP-8 (PT-08)

Top View

1

VIN

PVIN

8

2

GND

LX

7

3

SD

PGND

6

4

VREF

VFB

5

2005/02/02 Rev. 1.5

Champion Microelectronic Corporation

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