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CM3708A Datasheet PDF : 6 Pages
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CM3708A
3A LOW-NOISE PWM STEP-DOWN REGULATOR
GENERAL DESCRIPTION
FEATURES
The CM3708A 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 CM3708A 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 Filed #6,452,366
600KHz switching and synchronization
Dynamic output-voltage adjustment from VREF to VIN
3A Guaranteed Output Current
95% Efficiency
No Schottky Diode Required
16-pin PSOP/PTSSOP power packages
6A Low Noise Current Limit Protection
External Soft Start
Rail to Rail output Buck Converter
The CM3708A can deliver over 3.0A. The output voltage can
be adjusted from VREF to VIN. The input range is from 2.0V
to 5.0V. Other features of the CM3708A include high
efficiency, low dropout voltage. It is available in a
space-saving 16-pin SOP & TSSOP package.
APPLICATIONS
Cellular Phone
Cordless Phone
PDAs and Handy-Terminals
AGP Chipset Supplies
PIN CONFIGURATION
CPU I/O Supplies
Notebook Chipset Supplies
Battery Operated Devices
PSOP-16 (PS16) / PTSSOP-16 (PT16)
Top View
1
VIN1
VIN2
16
2
PVIN1
PVIN2
15
3
LX1
LX2
14
4
PGND1
PGND2
13
5
AGND
AGND
12
6
SD
VFB
11
7
VREF
NC
10
8
AGSEN
AGND
9
2004/12/13
Champion Microelectronic Corporation
Page 1
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