LTC1514-3.3

Features:

3.3V or 5V Output Voltages
2V to 10V Input Voltage Range
Up to 50mA Output Current
Only Three External Capacitors Required
Soft Start Limits Inrush Current at Turn-On
Low Operating Current: 60A
Low Shutdown Current: 10A
Shutdown Disconnects Load from V_IN
Short-Circuit and Overtemperature Protected
650kHz Switching Frequency
Low-Battery Comparator Active in Shutdown
Available in SO-8 Package


Application

Battery-Operated Equipment
Smart Card Readers
Local Power Supplies
Handheld Instruments
Battery Backup Supplies


Pinout




Specifications

V_IN to GND................................................ 0.3V to 12V
V_OUT to GND............................................. 0.3V to 12V
SHDN, LBI, LBO to GND ........................... 0.3V to 12V
V_OUT Short-Circuit Duration.............................Indefinite
Operating Temperature Range
        Commercial.......................................0°C to 70°C
        Industrial.....................................40°C to 85°C
Storage Temperature Range..............65°C to 150°C
Lead Temperature (Soldering, 10 sec).................300°C


Description

The LTC^(R) 1514-3.3/LTC1514-5 are micropower switched capacitor DC/DC converters that produce a regulated output voltage by either stepping up or stepping down the input voltage. Output voltage is fixed at either 3.3V(LTC1514-3.3) or 5V (LTC1514-5) by an internal resistor divider.

A unique architecture of  LTC^(R) 1514-3.3/LTC1514-5 allows the parts to accommodate a wide input voltage range (2V to 10V) while maintaining ±4% regulation. Additional circuitry prevents excessive inrush current and output voltage ripple when large V_INto V_OUT differentials are present.

An internal uncommitted comparator is kept active in shutdown. The comparator has an open-drain output for flexible interfacing.

The parts are short-circuit and overtemperature pro- tected. Battery life is maximized by very low operating currents (I_CC = 60A typ, 10A in shutdown). Both parts are available in an SO-8 package.