The LTC1265CS-5 is a monolithic step-down current mode DC/DC converter featuring Burst Mode™ operation at low output current. The LTC1265CS-5 incorporates a 0.3Ω switch (VIN =10V) allowing up to 1.2A of output current.
Under no load condition, the converter draws only 160µA. In shutdown it typically draws a mere 5µA making this converter ideal for current sensitive applications. In dropout the internal P-channel MOSFET switch is turned on continuously maximizing the life of the battery source. The LTC1265CS-5 incorporates automatic power saving Burst Mode operation to reduce gate charge losses when the load currents drop below the level required for continuous operation.
The inductor current is user-programmable via an external current sense resistor. Operation up to 700kHz permits the use of small surface mount inductors and capacitors.
Feature
- High Efficiency: Up to 95%
- Current Mode Operation for Excellent Line and Load Transient Response
- Internal 0.3Ω Power Switch (VIN = 10V)
- Short-Circuit Protection
- Low Dropout Operation: 100% Duty Cycle
- Low-Battery Detector
- Low 160µA Standby Current at Light Loads
- Active-High Micropower Shutdown: IQ < 15µA
- Peak Inductor Current Independent of Inductor Value
- Available in 14-pin SO Package
Applications
- 5V to 3.3V Conversion
- Distributed Power Systems
- Step-Down Converters
- Inverting Converters
- Memory Backup Supply
- Portable Instruments
- Battery-Powered Equipment
- Cellular Telephones
