SiP12501

SiP12501 New Product Vishay Siliconix www.DataSheet4U.com Boost Converter for Single/Double AA Cell or NiMH Battery for White LED Applications FEATURES D Voltage Mode Control with Internal Frequency Compensation D 0.65-V to 3.3-V Input Voltage Range D Low Startup Voltage: 0.65 V D PWM Control with 600-kHz Fixed Switching Frequency D Analog Control of LED Intensity D Power Supply from Output Voltage D Regulated Output Current D Integrated UVLO and Soft-Start D Logic Controlled Shutdown (t1 mA) D High Efficiency: Typical 75% D D D D D Internal Power MOS Antiringing Switch to Minimize EMI Thermal Shutdown Minimum External Components PowerPAKr MLP33-6 Package APPLICATIONS D D D D D White LED Backlighting Handheld Devices Digital Cameras Portable Applications LCD Bias Supplies DESCRIPTION SiP12501 is a boost converter IC for single or double cell NiMH or Alkaline battery pack, which can drive white LEDs connected in parallel to provide backlight in hand-held devices. Designed with an internal low threshold power MOSFET, it is capable of starting up with a low battery voltage of 0.65 V. For best efficiency performance, the SiP12501 is designed to operate in PWM mode with 600-kHz switching. The voltage-mode PWM design is internally compensated, reducing the external parts count. It accepts input voltages from 0.65 V to 3.3 V, regulates output current of up to 60 mA from a 0.9-V input. The LED current can be adjusted externally for its brightness control. SiP12501 features low s...