LTC1474IS8

IC CONV STEP-DWN HI-EFF 8-SOIC

DESCRIPTIONU

The LTC®1474/LTC1475 series are high efficiency step down converters with internal P-channel MOSFET power switches that draw only 10µA typical DC supply current at no load while maintaining output voltage. The LTC1474 uses logic-controlled shutdown while the LTC1475 features pushbutton on/off.

FEATURES

■ High Efficiency: Over 92% Possible

■ Very Low Standby Current: 10µA Typ

■ Available in Space Saving 8-Lead MSOP Package

■ Internal 1.4Ω Power Switch VIN = 10V

■ Wide VIN Range: 3V to 18V Operation

■ Very Low Dropout Operation: 100% Duty Cycle

■ Low-Battery Detector Functional During Shutdown

■ Programmable Current Limit with Optional

   Current Sense Resistor 10mA to 400mA Typ

■ Short-Circuit Protection

■ Few External Components Required

■ Active Low Micropower Shutdown: IQ = 6µA Typ

■ Pushbutton On/Off LTC1475 Only

■ 3.3V, 5V and Adjustable Output Versions

APPLICATIONS

■ Cellular Telephones and Wireless Modems

■ 4mA to 20mA Current Loop Step-Down Converter

■ Portable Instruments

■ Battery-Operated Digital Devices

■ Battery Chargers

■ Inverting Converters

■ Intrinsic Safety Applications