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APW7209

ANPEC
Part Number APW7209
Manufacturer ANPEC
Description Step-Up Converter
Published Mar 7, 2014
Detailed Description APW7209 1MHz, High-Efficiency, Step-Up Converter for 2 to 10 White LEDs Features • • • • • • • • • • • Wide Input Volta...
Datasheet PDF File APW7209 PDF File

APW7209
APW7209

Overview
APW7209 1MHz, High-Efficiency, Step-Up Converter for 2 to 10 White LEDs Features • • • • • • • • • • • Wide Input Voltage from 2.
5V to 6V 0.
3V Reference Voltage Fixed 1MHz Switching Frequency High Efficiency up to 88% 100Hz to 200kHz PWM Brightness Control Frequency Open-LED Protection Under-Voltage Lockout Protection Over-Temperature Protection <1µA Quiescent Current during Shutdown SOT-23-6 and TSOT-23-6A Package Lead Free and Green Devices Available (RoHS Compliant) General Description The APW7209 is a current-mode and fixed frequency boost converter with an integrated N-FET to drive up to 10 white LEDs in series.
The series connection allows the LED current to be identical for uniform brightness.
Its low on-resistance of NFET and low feedback voltage reduce power loss and achieve high efficiency.
Fast switching frequency(1MHz typical) allows using small-size inductor and both of input and output capacitors.
An over-voltage protection function, which monitors the output voltage via OVP pin, stops switching of the IC if the OVP voltage exceeds the over voltage threshold.
An internal soft-start circuit eliminates the inrush current during start-up.
The APW7209 also integrates under-voltage lockout, overtemperature protection, and current limit circuits to protect the IC in abnormal conditions.
The APW7209 is available in a SOT-23-6 and TSOT-23-6 package.
Applications • • • • White LED Display Backlighting Cell Phone and Smart Phone PDA, PMP, MP3 Digital Camera Simplified Application Circuit VIN L1 22µH C1 4.
7µF 6 VIN 2 4 GND EN LX 1 OVP 5 FB 3 R1 15Ω C2 1µF Up to 10 WLEDs VOUT Pin Configuration OFF ON LX 1 GND 2 FB 3 6 VIN 5 OVP 4 EN APW7209 SOT-23-6/TSOT-23-6 (Top View) ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and advise customers to obtain the latest version of relevant information to verify before placing orders.
Copyright © ANPEC Electronics Corp.
Rev.
A.
8 - Sep.
, 2013 1 www.
anpec.
com.
tw Free D...


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