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