LM2788 Datasheet | National Semiconductor

Description The LM2788 switched capacitor step-down DC/DC converter efficiently produces a 120m A regulated low-voltage rail from a 2.6V to 5.5V input. Fixed output voltage options of 1.5V, 1.8V, and 2.0V are available. The LM2788 uses multiple fractional gain configurations to maximize conversion efficiency over the entire input voltage and output current ranges. Also contributing to high overall efficiency is the extremely low supply current of the LM2788: 32µA operating unloaded and 0.1µA in shutdown. The optimal external ponent requirements of the LM2788 solution minimize size and cost, making the part ideal for Li-Ion and other battery powered designs. Two 1µF flying capacitors and two 10µF bypass capacitors are all that are required, and no inductors are needed. The LM2788 also features noise-reducing soft-start circuitry, short-circuit protection and over-temperature protection. Features n Output voltage options: 2.0V ± 5%, 1.8V ± 5%, 1.5V ± 6% n 120m A output current capability n Multi-Gain and Gain Hopping for Highest Possible Efficiency - up to 90% Efficient n 2.6V to 5.5V input range n Low operating supply current: 32µA n Shutdown supply current: 0.1µA n Thermal and short circuit protection n Available in an 8-Pin MSOP Package Applications n n n n n Cellular Phones Pagers H/PC and P/PC Devices Portable Electronic Equipment Handheld Instrumentation Typical Application Circuit © 2002 National Semiconductor Corporation DS200444 .national. Connection Diagram LM2788 Mini SO-8 (MSOP-8) Package NS Package #: MUA08A .. Top View Pin Description Pin 1 2 3 4 5 6 7 8 Name VOUT C1C1+ VIN EN C2+ GND C2Regulated Output Voltage First Flying Capacitor: Negative Terminal First Flying Capicitor: Positive terminal Input voltage. Remended VIN Range: 2.6V to 5.5V Enable. Logic Input. High voltage = ON, Low voltage = SHUTDOWN Second Flying-Capacitor: Positive Terminal Ground Connection Second Flying Capacitor: Negative Terminal...