Single Cell High Current Micropower 600kHz Boost DC/DC Converter

The LT1308 is a micropower, fixed frequency boost DC/DC converter that operates from an input voltage as low as 1V. Capable of delivering 5V at load current of 1A from a single Li-Ion cell, the LT1308 also features power saving Burst Mode operation at light loads. High efficiency is maintained over a broad 1mA to 1A load range.

The device contains a low-battery detector with a 200mV reference and shuts down to less than 5µA quiescent current. No-load quiescent current is 100µA and the internal NPN power switch handles a 2A current with a voltage drop of just 300mV.

High frequency 600kHz switching allows the use of small, surface mount components. The LT1308's current mode architecture provides fast response to load and line variations. The device is available in an 8-lead SO package.

Features

LT1308

Not Recommended For New Designs

LT1308A

Improved Transient Response, Burst Mode

LT1308B

Improved Transient Response, Burst Mode Disabled

Applications

* GSM Terminals

* Digital Cameras

* Answer-Back Pagers

* Cordless Telephones

* DECT Phones

* GPS Receivers

* Battery Backup Supplies

* 5V at 1A from a Single Li-Ion Cell

* 3.3V at 300mA from a Single NiCd Cell

* Low Quiescent Current: 100µA

* Operates with VIN as Low as 1V

* Fixed Frequency Operation: 600kHz

* Current Mode PWM Delivers Low Output Ripple

* Guaranteed Start-Up into Full Load

* Low Shutdown Current: 3µA

* Low-Battery Comparator

* Automatic Burst Mode™ Operation at Light Load

* Low VCESAT Switch: 300mV at 2A