APW7209

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 ...