LT1304-3.3 Datasheet | Linear Technology

LT1304/LT1304-3.3/LT1304-5 Micropower DC/DC Converters with Low-Battery Detector Active in Shutdown Features s s s s s s s s s DESCRIPTION The LT®1304 is a micropower step-up DC/DC converter ideal for use in small, low voltage, battery-operated systems. The devices operate from a wide input supply range of 1.5V to 8V. The LT1304-3.3 and LT1304-5 generate regulated outputs of 3.3V and 5V and the adjustable LT1304 can deliver output voltages up to 25V. Quiescent current, 120µA in active mode, decreases to just 10µA in shutdown with the low-battery detector still active. Peak switch current, internally set at 1A, can be reduced by adding a single resistor from the ILIM pin to ground. The high speed operation of the LT1304 allows the use of small, surface-mountable inductors and capacitors. The LT1304 is available in an 8-lead SO package. , LTC and LT are registered trademarks of Linear Technology Corporation. 5V at 200m A from Two Cells 10µA Quiescent Current in Shutdown Operates with VIN as Low as 1.5V Low-Battery Detector Active in Shutdown Low Switch VCESAT: 370m V at 1A Typical 120µA Quiescent Current in Active Mode Switching Frequency Up to 300k Hz Programmable Peak Current with One Resistor 8-Lead SO Package U APPLICATIONS s s s s s s 2-, 3-, or 4-Cell to 5V or 3.3V Step-Up Portable Instruments Bar Code Scanners Palmtop puters Diagnostic Medical Instrumentation Personal Data municators/puters TYPICAL APPLICATION 2-Cell to 5V Step-Up Converter with Low-Battery Detect 22µH- 3 1 VIN LBI 4 SW SENSE LT1304-5 6 ILIM SHDN 7 SHUTDOWN - SUMIDA CD54-220 - - 1N5817 1304 TA01 D1- - 90 499k 8 100k 2 CELLS 100µF 604k NC 100µF LBO LOW WHEN VBAT < 2.2V EFFICIENCY (%) + + 5V 200m A LBO GND 5 60 VIN = 3.3V VIN = 2.5V VIN = 1.8V 1 10 100 LOAD CURRENT (m A) 500 1304 TA02 40...