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LTC3127 - 1A Buck-Boost DC/DC Converter with Programmable Input Current Limit

The LTC3127 is a wide VIN range, highly efficient, 1.35MHz fixed frequency buck-boost DC/DC converter that operates from input voltages above, below or equal to the output voltage. The LTC3127 features programmable average input current limit, making it ideal for power-limited input sources. The input current limit is programmed with a single resistor and is accurate from 0.2A to 1A of average input current.

The topology incorporated provides a continuous transfer function through all operating modes. Other features include <1μA shutdown current, pin-selectable Burst Mode operation and thermal overload protection. The LTC3127 is housed in thermally enhanced 10-lead (3mm × 3mm × 0.75mm) DFN packages and 12-lead MSOP packages.

Features Programmable (0.2A to 1A) ±4% Accurate Average Input Current Limit Regulated Output with Input Voltages Above, Below or Equal to the Output 1.8V to 5.5V (Input) and 1.8V to 5.25V (Output) Voltage Range 0.6A Continuous Output Current: VIN > 1.8V 1A Continuous Output Current: VIN > 3V Single Inductor Synchronous Rectification: Up to 96% Efficiency Burst Mode® Operation: IQ = 35μA (Pin Selectable) Output Disconnect in Shutdown <1μA Shutdown Current Small, Thermally Enhanced 10-Lead (3mm × 3mm × 0.75mm) DFN and 12-Lead MSOP Packages Typical Application

Applications USB Powered GSM Modems Supercap Charger Handheld Test Instruments PC Card Modems Wireless Terminals Packaging

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