LT1111

Supply Voltage (VIN) .............................................36V
SW1 Pin Voltage (VSW1) .......................................50V
SW2 Pin Voltage (VSW2) ...................... . 0.5V to V_IN
Feedback Pin Voltage (LT1111) ............................5.5V
Switch Current .....................................................1.5A
Maximum Power Dissipation ............................ 500mW
Operating Temperature Range
    LT1111C ............................................... 0 to 70
    LT1111I ......................................... 40 to 105
    LT1111M ....................................... 55 to 125
Storage Temperature Range ................65 to 150
Lead Temperature (Soldering, 10 sec)................. 300

The LT1111 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.