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.
Feature
- 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
Applications
- Handheld Devices
- Cellular Phones
- Portable Electronic Equipment
- DSP Power Supplies
(Picture: Pinout)
