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LTC1475CS8-5 Datasheet(PDF) 1 Page - Linear Technology |
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LTC1475CS8-5 Datasheet(HTML) 1 Page - Linear Technology |
1 / 20 page 1 LTC1474/LTC1475 Low Quiescent Current High Efficiency Step-Down Converters LOAD CURRENT (mA) 100 90 80 70 60 50 0.03 3 300 1474/75 TA01 0.3 30 VIN = 5V VIN = 10V VIN = 15V L = 100 µH VOUT = 3.3V RSENSE = 0Ω LTC1474 Efficiency Figure 1. High Efficiency Step-Down Converter VIN GND SENSE LBI RUN VFB LBO SW LTC1474-3.3 + 6 3 8 1 2 5 7 4 100k LOW BATTERY IN RUN SHDN 0.1 µF 10 µF 25V VIN 4V TO 18V LOW BATTERY OUT 1474/75 F01 L1 100 µH D1 MBR0530 + 100 µF 6.3V VOUT 3.3V AT 250mA L1 = SUMIDA CDRH74-101 FEATURES DESCRIPTION s High Efficiency: Over 92% Possible s Very Low Standby Current: 10 µA Typ s Available in Space Saving 8-Lead MSOP Package s Internal 1.4 Ω Power Switch (VIN = 10V) s Wide VIN Range: 3V to 18V Operation s Very Low Dropout Operation: 100% Duty Cycle s Low-Battery Detector Functional During Shutdown s Programmable Current Limit with Optional Current Sense Resistor (10mA to 400mA Typ) s Short-Circuit Protection s Few External Components Required s Active Low Micropower Shutdown: IQ = 6µA Typ s Pushbutton On/Off (LTC1475 Only) s 3.3V, 5V and Adjustable Output Versions The LT C ®1474/LTC1475 series are high efficiency step- down converters with internal P-channel MOSFET power switches that draw only 10 µA typical DC supply current at no load while maintaining output voltage. The LTC1474 uses logic-controlled shutdown while the LTC1475 fea- tures pushbutton on/off. The low supply current coupled with Burst Mode TM opera- tion enables the LTC1474/LTC1475 to maintain high effi- ciency 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 start- up 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 components provide for a minimum area solution. APPLICATIONS s Cellular Telephones and Wireless Modems s 4mA to 20mA Current Loop Step-Down Converter s Portable Instruments s Battery-Operated Digital Devices s Battery Chargers s Inverting Converters s Intrinsic Safety Applications TYPICAL APPLICATION , LTC and LT are registered trademarks of Linear Technology Corporation. Burst Mode is a trademark of Linear Technology Corporation. |
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