■ Operates at Supply Voltages from 2V to 30V
■ Works with Surface Mount Inductors■ 72kHz Oscillator
■ Only Three External Components Required
■ Step-Up or Step-Down Mode
■ Low-Battery Detector Comparator On-Chip
■ User Adjustable Current Limit
■ Internal 1A Power Switch
■ Fixed or Adjustable Output Voltage Versions
■ Space Saving 8-Pin MiniDIP or SO-8 Package
APPLICATIONS
■ 3V to 5V, 5V to 12V Converters
■ 9V to 5V, 12V to 5V Converters
■ Remote Controls
■ Peripherals and Add-On Cards
■ Battery Backup Supplies
■ Uninterruptible Supplies
■ Laptop and Palmtop Computers
■ Cellular Telephones
■ Portable Instruments
■ Flash Memory VPP Generators
DESCRIPTION
The LT® 1111 is a versatile micropower DC/DC converter. The device requires only three external components to deliver a fixed output of 5V or 12V. Supply voltage ranges from 2V to 12V in step-up mode and to 30V in step-down mode. The LT1111 functions equally well in step-up, stepdown, or inverting applications.
The LT1111 oscillator is set at 72kHz, optimizing the device to work with off-the-shelf surface mount inductors. The device can deliver 5V at 100mA from a 3V input in step-up mode or 5V at 200mA from a 12V input in stepdown mode.
Switch current limit can be programmed with a single resistor. An auxiliary open-collector gain block can be configured as a low-battery detector, linear post regulator, undervoltage lock-out circuit, or error amplifier.
For input sources of less than 2V use the LT1110
(Picture:Pinout / Diagram)
