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LT1317B

Linear Technology
Part Number LT1317B
Manufacturer Linear Technology
Description Micropower/ 600kHz PWM DC/DC Converters
Published Mar 22, 2005
Detailed Description LT1317/LT1317B Micropower, 600kHz PWM DC/DC Converters FEATURES s s s s s s DESCRIPTION The LT ®1317/LT1317B are micro...
Datasheet PDF File LT1317B PDF File

LT1317B
LT1317B

Overview
LT1317/LT1317B Micropower, 600kHz PWM DC/DC Converters FEATURES s s s s s s DESCRIPTION The LT ®1317/LT1317B are micropower, fixed frequency step-up DC/DC converters that operate over a wide input voltage range of 1.
5V to 12V.
The LT1317 features automatic shifting to power saving Burst ModeTM operation at light loads.
High efficiency is maintained over a broad 300µA to 200mA load range.
Peak switch current during Burst Mode operation is kept below 250mA for most operating conditions which results in low output ripple voltage, even at high input voltages.
The LT1317B does not shift into Burst Mode operation at light loads, eliminating low frequency output ripple at the expense of light load efficiency.
The LT1317/LT1317B contain an internal low-battery detector with a 200mV reference that stays alive when the device goes into shutdown.
No-load quiescent current of the LT1317 is 100µA and shuts down to 30µA.
The internal NPN power switch handles a 500mA current with a voltage drop of just 300mV.
The LT1317/LT1317B are available in MS8 and SO-8 packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
s s s 100µA Quiescent Current Operates with VIN as Low as 1.
5V 600kHz Fixed Frequency Operation Starts into Full Load Low-Battery Detector Active in Shutdown Automatic Burst Mode Operation at Light Load (LT1317) Continuous Switching at Light Loads (LT1317B) Low VCESAT Switch: 300mV at 500mA Pin for Pin Compatible with the LT1307/LT1307B U APPLICATIONS s s s s s s s s Cellular Telephones Cordless Telephones Pagers GPS Receivers Battery Backup Portable Electronic Equipment Glucose Meters Diagnostic Medical Instrumentation TYPICAL APPLICATION L1 10µH 2-Cell to 3.
3V Converter Efficiency D1 90 2.
2VIN 3VIN + C1 47µF VIN LBI LT1317 SHDN VC RC 33k CC 3.
3nF SW FB LBO GND R1 1M 1% R2* 604k 1% 3.
3V 200mA 80 EFFICIENCY (%) 2 CELLS SHUTDOWN 70 + C2 47µF 60 50 1317 F01 D1: MBR05...


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