APW7236

APW7236 1.5MHz Step-Up Converter for White LEDs Features General Description Wide Input Voltage from 2.7V to 6V Fixed 1.5MHz Switching Frequency Reference Voltage : 0.2V PWM Brightness Control with Wide Frequency Range of 100Hz to 100kHz Build-In Power MOSFET : 0.2Ω Open-LED Protection Under-Voltage Lockout Protection Over-Temperature Protection <1µA Quiescent Current during Shutdown TSOT-23-6A and TDFN2x2-8 Package Halogen and Lead Free Available (RoHS Compliant) Applications The APW7236 is a current-mode and fixed frequency boost converter with an integrated N-FET to drive white LEDs. 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(1.5MHz 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 APW7236 also integrates under-voltage lockout, overtemperature protection, and current limit circuits to protect the IC in abnormal conditions. The APW7236 is available in a TSOT-23-6A and TDFN2x2-8 package. White LED Display Backlighting Cell Phone and Smart Phone PDA, PMP, MP3 Digital Camera Simplified Application Cir...