LT1303-5 Datasheet | Linear Technology

LT1303/LT1303-5 Micropower High Efficiency DC/DC Converters with Low-Battery Detector Adjustable and Fixed 5V Features s s s s s s s s DESCRIPTION The LT®1303/LT1303-5 are micropower step-up high efficiency DC/DC converters using Burst Mode TM operation. They are ideal for use in small, low-voltage batteryoperated systems. The LT1303-5 accepts an input voltage between 1.8V and 5V and converts it to a regulated 5V. The LT1303 is an adjustable version that can supply an output voltage up to 25V. Quiescent current is only 120µA from the battery and the shutdown pin further reduces current to 10µA. The low-battery detector provides an opencollector output that goes low when the input voltage drops below a preset level. The on-chip NPN power switch has a low 170m V saturation voltage at a switch current of 1A. The LT1303/LT1303-5 are available in 8-lead PDIP or SO packages, easing board space requirements. For higher output current, please see the LT1305 or LT1302. , LTC and LT are registered trademarks of Linear Technology Corporation. Burst Mode is a trademark of Linear Technology Corporation. 5V at 200m A from a 2V Input Supply Voltage As Low As 1.8V Up to 88% Efficiency 120µA Quiescent Current Low-Battery Detector Low VCESAT Switch: 170m V at 1A Typ Uses Inexpensive Surface Mount Inductors 8-Lead PDIP or SO Package U APPLICATIONS s s s s s s s EL Panel Drivers 2-Cell and 3-Cell to 5V Conversion Palmtop puters Portable Instruments Bar-Code Scanners PDAs Wireless Systems TYPICAL APPLICATION L1 22µH 316k 1% 1N5817 90 80 VIN LBI SW SENSE LT1303-5 100k LBO PGND 100µF EFFICIENCY (%) + 2 CELLS VOUT, 5V 200m A LOW BATTERY GOES LOW AT VBAT = 2.2V 100µF 412k 1% SHUTDOWN SHDN GND 70 60 50 40 + L1 = SUMDIA CD54-220 LT1303 TA02 Figure 1. 2-Cell to 5V DC/DC Converter with Low-Battery Detect 5V Output Efficiency VIN = 4V VIN = 2V VIN = 2.5V VIN = 3V LT1303 TA01 LOAD CURRENT (m A) LT1303/LT1303-5...