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SI9176_04

Description
High Performance Step-Down DC-DC Converter With Adjustable Output Voltage
File Size287KB,17 Pages
ManufacturerVishay
Websitehttp://www.vishay.com
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SI9176_04 Overview

High Performance Step-Down DC-DC Converter With Adjustable Output Voltage

Si9176
Vishay Siliconix
High Performance Step-Down DC-DC Converter
With Adjustable Output Voltage
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FEATURES
2-MHz PWM Operation
Integrated MOSFET Switches
2.6-V to 6.0-V Input Voltage Range
Minimal Number of External Components
Up to 96% conversion efficiency
600-mA Load Capability
100% Duty Cycle Allows Low Dropout
Integrated Compensation Circuit
Over-Current Protection
Shutdown Current < 2
mA
Thermal Shutdown
Integrated UVLO
10-Pin MSOP and Space Saving MLP33 Packaging
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User Selectable PWM, PSM, or AUTO Mode
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PSM Frequency
w20
kHz for Inaudible
Harmonics
APPLICATIONS
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W-CDMA Cell Phone
PDAs/Palmtop PCs
LCD Modules
Portable Image Scanners
GPS Receivers
Smart Phones
MP3 Players
3G Cell Phone
Digital Cameras
DESCRIPTION
The Si9176 is a high efficiency 600-mA step down converter
with internal low on resistance power MOSFET switch and
synchronous rectifier transistors. It is designed to convert one
cell LiIon battery or three cell alkaline battery voltages to a
dynamically adjustable dc output.
The integrated high
frequency error amplifier with internal compensation
minimizes external components.
In order to insure efficient conversion throughout the entire
load range, PWM (pulse width modulation), PSM (pulse
skipping mode) or Auto mode can be selected. In PWM mode,
2-MHz switching permits use of small external inductor and
capacitor sizes allowing
one of the smallest solutions.
PSM mode provides increased efficiency at light loads. In PSM
mode the oscillator frequency is kept above 20 kHz to avoid
audio band interference. When operating in Auto mode, the
converter automatically selects operating in either PWM or
PSM mode according to load current demand.
The Si9176 is available in the10-pin MSOP and the even
smaller MLP33 package and is specified to operate over the
industrial temperature range of –40_C to 85_C. The Si9176
packaged in the MLP33 package is available in both standard
and lead (Pb)-free.
TYPICAL APPLICATIONS CIRCUIT
BATTERY
C
IN
10
mF
V
IN
V
DD
LX
2.2
mH
V
OUT
Si9176
PGND
C
OUT
4.7
mF
R
1
FB
ENABLE
PWM/PSM/AUTO
SD
MODE
REF
AGND
REF
R
2
Document Number: 71753
S-41148—Rev. C, 14-Jun-04
www.vishay.com
1

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Description High Performance Step-Down DC-DC Converter With Adjustable Output Voltage High Performance Step-Down DC-DC Converter With Adjustable Output Voltage High Performance Step-Down DC-DC Converter With Adjustable Output Voltage High Performance Step-Down DC-DC Converter With Adjustable Output Voltage High Performance Step-Down DC-DC Converter With Adjustable Output Voltage High Performance Step-Down DC-DC Converter With Adjustable Output Voltage
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