The LTC3251/LTC3251-1.2/LTC3251-1.5 are 2-phase charge pump step-down DC/DC converters that produce a regulated output from a 2.7V to 5.5V input. The parts use switched capacitor fractional conversion to achieve twice the typical efficiency of a linear regulator. No inductors are required. VOUT is resistor programmable from 0.9V to 1.6V or fixed at 1.2V or 1.5V, with up to 500mA of load current available. A unique 2-phase spread spectrum architecture provides a very low noise regulated output as well as low noise at the input. The parts have four operating modes: Continuous Spread Spectrum, Spread Spectrum with Burst Mode operation, Super Burst™ mode operation and shutdown. Low operating current (35µA in Burst Mode operation, 10µA in Super Burst mode operation) and low external parts count make the LTC3251/LTC3251-1.2/LTC3251-1.5 ideally suited for space-constrained battery-powered applications. The parts are short-circuit and over-temperature protected, and are available in a thermally enhanced 10-pin MSOP package. Applications * Handheld Devices * Cellular Phones * Portable Electronic Equipment * DSP Power Supplies * Up to 500mA Output Current * No Inductors * 2.7V to 5.5V Input Voltage Range * 2x Efficiency Improvement Over LDOs * 2-Phase, Spread Spectrum Operation for Low Input and Output Noise * Shutdown Disconnects Load from VIN * Adjustable Output Voltage Range: 0.9V to 1.6V * Fixed Output Voltages: 1.2V, 1.5V * Super Burst, Burst and Burst Defeat Operating Modes * Low Operating Current: IIN = 35µA (Burst Mode® Operation) * Super Burst Operating Current: IIN = 10µA * Low Shutdown Current: IIN = 0.01µA Typ * Soft-Start Limits Inrush Current at Turn-On * Short-Circuit and Overtemperature Protected * Available in a Thermally Enhanced 10-Pin MSOP Package https://elecena.pl/product/256880/500ma-high-efficiency-low-noise-inductorless-step-down-dc-dc-converters 2007-03-03 https://elecena.pl/product/256880/500ma-high-efficiency-low-noise-inductorless-step-down-dc-dc-converters 2014-06-12 https://elecena.pl/product/256880/500ma-high-efficiency-low-noise-inductorless-step-down-dc-dc-converters 2025-01-22