LTC1474 Datasheet | Linear Technology

LTC1474/LTC1475 Low Quiescent Current High Efficiency Step-Down Converters DESCRIPTION The LT C®1474/LTC1475 series are high efficiency stepdown 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. The low supply current coupled with Burst Mode TM operation enables the LTC1474/LTC1475 to maintain high efficiency over a wide range of loads. These Features , along with their capability of 100% duty cycle for low dropout and wide input supply range, make the LTC1474/LTC1475 ideal for moderate current (up to 300m A) battery-powered applications. The peak switch current is user-programmable with an optional sense resistor (defaults to 325m A minimum if not used) providing a simple means for optimizing the design for lower current applications. The peak current control also provides short-circuit protection and excellent startup behavior. A low-battery detector that remains functional in shutdown is provided . The LTC1474/LTC1475 series availability in 8-lead MSOP and SO packages and need for few additional ponents provide for a minimum area solution. , LTC and LT are registered trademarks of Linear Technology Corporation. Burst Mode is a trademark of Linear Technology Corporation. Features s s s s s s s s s s s s s 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 (10m A to 400m A Typ) Short-Circuit Protection Few External ponents Required Active Low Micropower Shutdown: IQ = 6µA Typ Pushbutton On/Off (LTC1475 Only) 3.3V, 5V and Adjustable Output Versions U APPLICATIONS s s s s s s s Cellular...