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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 shutdown current of under 1 μA, internal power MOS, thermal shutdown protection and antiringing control.

FEATURES

? Voltage mode control with internal frequency compensation

? 0.65 V to 3.3 V input voltage range

? Low startup voltage: 0.65 V

? PWM control with 600 kHz fixed switching frequency

? Analog control of LED intensity

? Power supply from output voltage

? Regulated output current

? Integrated UVLO and soft-start

? Logic controlled shutdown (< 1 μA)

? High efficiency: typical 75

? Internal power MOS

? Antiringing switch to minimize EMI

? Thermal shutdown

? Minimum external components

? PowerPAK? MLP33-6 package

APPLICATIONS

? White LED backlighting

? Handheld devices

? Digital cameras

? Portable applications

? LCD bias supplies