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LTC1911-1.5 - Low Noise, High Efficiency, Inductorless Step-Down DC/DC Converter

The LTC®1911 is a switched capacitor step-down DC/DC converter that produces a 1.5V or 1.8V regulated output from a 2.7V to 5.5V input. The part uses switched capacitor fractional conversion to achieve high efficiency over the entire input range. No inductors are required. Internal circuitry controls the step-down conversion ratio to optimize efficiency as the input voltage and load conditions vary.* Typical efficiency is over 25% higher than that of a linear regulator.

A unique constant frequency architecture provides a low noise regulated output as well as lower input noise than conventional charge pump regulators. High frequency operation (fOSC = 1.5MHz) simplifies output filtering to further reduce conducted noise. To optimize efficiency, the part enters Burst Mode® operation under light load conditions.

Low operating current (180µA with no load, 10µA in shutdown) and low external parts count (two 1µF flying capacitors and two 10µF bypass capacitors) make the LTC1911 ideally suited for space constrained batterypowered applications. The part is short-circuit and overtemperature protected, and is available in an 8-pin MSOP package.

特点 Low Noise Constant Frequency Operation 2.7V to 5.5V Input Voltage Range No Inductors Typical Efficiency 25% Higher Than LDOs Shutdown Disconnects Load from VIN Output Voltage: 1.8V ±4% or 1.5V ±4% Output Current: 250mA Low Operating Current: IIN = 180µA Typ Low Shutdown Current: IIN = 10µA Typ Oscillator Frequency: 1.5MHz Soft-Start Limits Inrush Current at Turn On Short-Circuit and Overtemperature Protected Available in an 8-Pin MSOP Package 典型应用

应用 Handheld Computers Cellular Phones Smart Card Readers Portable Electronic Equipment Handheld Medical Instruments Low Power DSP Supplies 封装信息

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