SC2604 Datasheet, PDF (1/14 Pages) Semtech Corporation – Simple PWM Boost Controller with Input Disconnect FET Drive

POWER MANAGEMENT
Features
 Input Voltage Range: 4.5V to 13.5V
 1% Voltage Reference Accuracy
 Up to 95% Efficiency
 Input Disconnect FET Drive
 In-rush Current Control
 Internal Compensation
 Programmable Current Limit
 Programmable Soft Start
 800mA Typical PWM Gate Drive
 400kHz Switching Frequency
 Under Voltage Lockout
 <200uA Shutdown Current
 -40^oC to +85^oC Temperature Range
 MSOP-8 Package, Fully WEEE and RoHS Compliant
Applications
 Portable Devices
 Flat Panel TV
 TV Set Top Box
 Auxiliary Supplies
 Peripheral Card Supplies
 Industrial Power Supply
 High Density DC/DC Conversion
Typical Application Circuit
SC2604
Simple PWM Boost Controller
with Input Disconnect FET Drive
Description
The SC2604 is a versatile, low-cost, voltage-mode PWM
controller designed for boost DC/DC power supply
applications. It features input disconnect FET driver
allowing power source and load separation at shutdown
mode, which eliminates possible leakage current from
source to load. Also, it prevents catastrophic failure when
output is shorted during operation.
The SC2604 also includes temperature compensated
voltage reference, internal ramp, current limit comparator,
internally compensated error amplifier, and floating driver
with charge pump. Programmable soft start controls
in-rush current and reduces output voltage overshoot.
Hiccup mode over-current protection allows system auto-
retry and ease of trouble shooting.
Internally compensated feedback loop makes power
supply design simple, and eliminates the need for external
compensation network.
The SC2604 is available in MSOP-8 package with rated
temperature range of -40^oC to +85^oC.
January 4, 2008
Figure 1. 12V to 25V/1A Boost Converter with Over Current Protection
www.semtech.com