CM3708AGIT CHAMP [Champion Microelectronic Corp.], CM3708AGIT Datasheet

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CM3708AGIT

Manufacturer Part Number
CM3708AGIT
Description
3A LOW-NOISE PWM STEP-DOWN REGULATOR
Manufacturer
CHAMP [Champion Microelectronic Corp.]
Datasheet
GENERAL DESCRIPTION
The CM3708A is a low-noise, pulse-width-modulated (PWM),
DC-DC step-down converter. It powers logic and transmitters
in
communicating PDAs, and handy-terminals. The device
features an internal synchronous rectifier for high efficiency; it
requires
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.
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 5.5V. Other features of the CM3708A include high
efficiency, low dropout voltage. It is available in a
space-saving 16-pin SOP & TSSOP package.
APPLICATIONS
PIN CONFIGURATION
2007/02/13 Rev1.3
small
Cellular Phone
Cordless Phone
PDAs and Handy-Terminals
AGP Chipset Supplies
no
wireless
external
systems
Schottky diode.
such
as cellular
1
2
3
4
5
6
7
8
Champion Microelectronic Corporation
PSOP-16 (PS16) / PTSSOP-16 (PT16)
Excellent
3A L
VIN1
PVIN1
LX1
PGND1
AGND
SD
VREF
AGSEN
phones,
noise
OW
Top View
-N
FEATURES
OISE
PGND2
PVIN2
AGND
AGND
VIN2
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
CPU I/O Supplies
Notebook Chipset Supplies
Battery Operated Devices
VFB
LX2
NC
PWM S
16
15
14
13
12
11
10
9
TEP
-D
OWN
CM3708A
R
EGULATOR
Page 1

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CM3708AGIT Summary of contents

Page 1

GENERAL DESCRIPTION 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 communicating PDAs, and handy-terminals. The device features an internal synchronous rectifier for high efficiency; it requires no external ...

Page 2

PIN DESCRIPTION Pin No. Symbol 1,16 VIN1, VIN2 Voltage supply for internal circuits 2,15 PVIN1, PVIN2 Voltage supply for output power transistors 3,14 LX1, LX2 Inductor connection to the Drains of the internal power MOSFETs 4,13 PGND1, PGND2 Ground for ...

Page 3

... ORDERING INFORMATION Part Number CM3708AIT CM3708AGIT* CM3708AIS CM3708AGIS Suffix for Pb Free Product *Note: ABSOLUTE MAXIMUM RATINGS Absolute maximum ratings are those values beyond which the device could be permanently damaged. PVIN/VIN …………......................................….......-0.3V to 6.0V Voltage on Any Other Pin ………... GND – 0.3V to VIN + 0.3V Output Current, Source or Sink … ...

Page 4

FUNCTIONAL DESCRIPTION The CM3708A step-down, pulse-width-modulated (PWM), DC-DC converter has an adjustable output range from VREF to the input voltage (VIN). An internal synchronous rectifier improves efficiency and eliminates an external Schottky diode. Fixed-frequency operation enables easy post-filtering, thereby providing ...

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PACKAGE DIMENSION 2007/02/13 Rev1 PWM S OW OISE 16-PIN PTSSOP (PT16) 16-PIN PSOP (PS16) θ Champion Microelectronic Corporation CM3708A -D R TEP OWN EGULATOR Page 5 ...

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Champion Microelectronic Corporation (CMC) reserves the right to make changes to its products or to discontinue any integrated circuit product or service without notice, and advises its customers to obtain the latest version of relevant information to verify, before placing ...

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