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LTC1503-2

Linear Technology
Part Number LTC1503-2
Manufacturer Linear Technology
Description High Efficiency Inductorless Step-Down DC/DC Converters
Published Mar 27, 2005
Detailed Description LTC1503-1.8/LTC1503-2 High Efficiency Inductorless Step-Down DC/DC Converters FEATURES s s s s s s s s s s s s DESCRIPT...
Datasheet PDF File LTC1503-2 PDF File

LTC1503-2
LTC1503-2

Overview
LTC1503-1.
8/LTC1503-2 High Efficiency Inductorless Step-Down DC/DC Converters FEATURES s s s s s s s s s s s s DESCRIPTIO Input Voltage Range: 2.
4V to 6V Fixed Output Voltages: 1.
8V ± 4%, 2V ± 4% Output Current: Up to 100mA No Inductors Typical Efficiency 25% Higher than LDOs Low Operating Current: 25µA Low Shutdown Current: 5µA 600kHz Switching Frequency Shutdown Disconnects Load from VIN Soft-Start Limits Inrush Current at Turn-On Short-Circuit and Overtemperature Protected Available in 8-Pin MSOP and SO Packages The LTC®1503-1.
8/LTC1503-2 are switched capacitor step-down DC/DC converters that produce a regulated output from a 2.
4V to 6V input.
The parts use 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 25% higher than that of a low dropout (LDO) linear regulator.
Regulation is achieved by sensing the output voltage and enabling the internal switching network as needed to maintain a fixed output voltage.
This method of regulation enables the parts to achieve high efficiency at extremely light loads.
Low operating current (25µA with no load, 5µA in shutdown) and low external parts count (two 1µF flying capacitors and two 10µF bypass capacitors) make the LTC1503-1.
8/LTC1503-2 ideally suited for space constrained battery-powered applications.
The parts are fully short-circuit and overtemperature protected.
The LTC1503-1.
8/LTC1503-2 are available in 8-pin MSOP and SO packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
U APPLICATIO S s s s s s s Cellular Phones Handheld Computers Smart Card Readers Low Power DSP Supplies Portable Electronic Equipment Handheld Medical Instruments TYPICAL APPLICATIO Single Li-Ion to 2V DC/DC Converter 80 4 1-CELL Li-Ion OR 3-CELL NiMH 10µF 1µF 2 3 5 VIN C1– C1+ VOUT C2 + ...


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