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The SiP12401 boost controller IC uses double-cell NiMH or alkaline and Li-ion batteries to drive white LEDs connected in series for uniformly bright backlighting without the need for ballast resistors. It supports an input voltage range of 1.8-5.0 volts. Designed to drive white LEDs connected in parallel, the SiP12501 is a boost converter IC for single- or double-cell NiMH or alkaline battery packs. An internal low-threshold power MOSFET allows the device to start up with a low battery voltage of 0.65 V. The SiP12501 accepts input voltages from 0.65-3.3 V and regulates an output current up to 60 milliamps from a 0.9 V input. Both devices feature a voltage-mode PWM design with internal frequency compensation to help reduce overall component count and enable design of smaller, lighter-end products. They are suitable for white LED backlighting for LCDs in portable electronics such as cell phones and digital cameras. VISHAY INTERTECHNOLOGY INC. Malvern, PA. www.vishay.com