LT1317IS8#PBF

The LT1317/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 Mode 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.

Applications

• Cellular Telephones
• Cordless Telephones
• Pagers
• GPS Receivers
• Battery Backup
• Portable Electronic Equipment
• Glucose Meters
• Diagnostic Medical Instrumentation

Key features

• 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