LT1308 Datasheet | Linear Technology

Final Electrical Specifications LT1308 Single Cell High Current Micropower 600k Hz Boost DC/DC Converter January 1998 Features s s s s s s s s s s s DESCRIPTION The LT ®1308 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 1m A to 1A load range. The device contains a low-battery detector with a 200m V 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 300m V. High frequency 600k Hz switching allows the use of small, surface mount ponents. The LT1308’s current mode architecture provides fast response to load and line variations. The device is available in an 8-lead SO package. , LTC and LT are registered trademarks of Linear Technology Corporation. Burst Mode is a trademark of Linear Technology Corporation. 5V at 1A from a Single Li-Ion Cell 3.3V at 300m A from a Single Ni Cd Cell Low Quiescent Current: 100µA Operates with VIN as Low as 1V Fixed Frequency Operation: 600k Hz Current Mode PWM Delivers Low Output Ripple Guaranteed Start-Up into Full Load Low Shutdown Current: 3µA Low-Battery parator Automatic Burst Mode TM Operation at Light Load Low VCESAT Switch: 300m V at 2A U APPLICATIONS s s s s s s s GSM Terminals Digital Cameras Answer-Back Pagers Cordless Telephones DECT Phones GPS Receivers Battery Backup Supplies TYPICAL APPLICATION 4.2V TO 3V Converter Efficiency SHDN LBI LT1308 Li-Ion CELL C1 10µF LBO VC RC 47k CC 22n F C1: CERAMIC C2: AVX TPS SERIES D1: INTERNATIONAL RECTIFIER 10BQ015 L1: COILTRONICS CTX5-1 COILCRAFT DO3316-472 VIN SW R1 301k FB GND R2 100k L1 4.7µH D1 5V 1A EFFICIENCY (%) 90 85 80 + C2 100µF 75 70 1308F01 Figure 1. Single Li-Ion Cell to 5V/1A...