LT1304

Features:

5V at 200mA from Two Cells
10A Quiescent Current in Shutdown
Operates with VIN as Low as 1.5V
Low-Battery Detector Active in Shutdown
Low Switch VCESAT: 370mV at 1A Typical
120A Quiescent Current in Active Mode
Switching Frequency Up to 300kHz
Programmable Peak Current with One Resistor
8-Lead SO Package

Application

2-, 3-, or 4-Cell to 5V or 3.3V Step-Up
Portable Instruments
Bar Code Scanners
Palmtop Computers
Diagnostic Medical Instrumentation
Personal Data Communicators/Computers


Pinout




Specifications

V_IN  Voltage ................................................................ 8V
SW Voltage............................................... 0.4V to 25V
FB Voltage (LT1304)...................................... V_IN  + 0.3V
Sense Voltage (LT1304-3.3/LT1304-5)  ..................... 8V
I_LIM Voltage ..............................................................  5V
SHDN Voltage ............................................................ 6V
LBI Voltage ............................................................... V_IN
LBO Voltage............................................................... 8V
Maximum Power Dissipation   .............................500mW
Junction Temperature.......................................... 125°C
Operating Temperature Range...................0°C to 70°C
Storage Temperature Range...............65°C to 150°C
Lead Temperature (Soldering, 10 sec)..................300°C 


Description

The LT^(R) 1304 is a micropower step-up DC/DC converter ideal for use in small, low voltage, battery-operated sys-tems. 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, 120A in active mode, decreases to just 10A 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 I  pin to ground. The LIM 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.