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LTC1474CMS8#PBF
LTC1474/LTC1475 Low Quiescent Current High Efficiency Step-Down Converters DESCRIPTION U FEATURES s s s s s s s s s s s s s 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. 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 The low supply current coupled with Burst ModeTM 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 300mA) battery-powered applications. The peak switch current is user-programmable with an optional sense resistor (defaults to 325mA 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 . U APPLICATIONS s s s s s s s 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 The LTC1474/LTC1475 series availability in 8-lead MSOP and SO packages and need for few additional components 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. U TYPICAL APPLICATION LTC1474 Efficiency 100 VIN 4V TO 18V LOW BATTERY OUT VIN = 5V 90 10µF 25V 0.1µF VIN = 10V 7 VIN 1 SENSE VFB LTC1474-3.3 3 2 LBO LBI 6 LOW BATTERY IN RUN SHDN 100k 8 RUN GND 4 SW VOUT 3.3V AT 250mA L1 100µH + 100µF 6.3V 5 D1 MBR0530 EFFICIENCY (%) + 80 VIN = 15V 70 60 L = 100µH VOUT = 3.3V RSENSE = 0Ω 1474/75 F01 L1 = SUMIDA CDRH74-101 50 Figure 1. High Efficiency Step-Down Converter 0.03 3 0.3 30 LOAD CURRENT (mA) 300 1474/75 TA01 1
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