DESCRIPTION
The LT®1308A/LT1308B are micropower, fi xed frequency step-up DC/DC converters that operate over a 1V to 10V input voltage range. They are improved versions of the LT1308 and are recommended for use in new designs. The LT1308A features automatic shifting to power saving Burst Mode operation at light loads and consumes just 140μA at no load. The LT1308B features continuous switching at light loads and operates at a quiescent current of 2.5mA. Both devices consume less than 1μA in shutdown.

FEATURES
■ 5V at 1A from a Single Li-Ion Cell
■ 5V at 800mA in SEPIC Mode from Four NiCd Cells
■ Fixed Frequency Operation: 600kHz
■ Boost Converter Outputs up to 34V
■ Starts into Heavy Loads
■ Automatic Burst Mode™ Operation at
   Light Load (LT1308A)
■ Continuous Switching at Light Loads (LT1308B)
■ Low VCESAT Switch: 300mV at 2A
■ Pin-for-Pin Upgrade Compatible with LT1308
■ Lower Quiescent Current in Shutdown: 1μA (Max)
■ Improved Accuracy Low-Battery Detector
   Reference: 200mV ±2%
■ Available in 8-Lead SO and 14-Lead TSSOP Packages

APPLICATIONS
■ GSM/CDMA Phones
■ Digital Cameras
■ LCD Bias Supplies
■ Answer-Back Pagers
■ GPS Receivers
■ Battery Backup Supplies
■ Handheld Computers