The LT1111 is a versatile micropower DC/DC converter.The device requires only three external components todeliver a fixed output of 5V or 12V. Supply voltage rangesfrom 2V to 12V in step-up mode and to 30V in step-downmode. The LT1111 functions equally well in step-up, step-down, or inverting applications.The LT1111 oscillator is set at 72kHz, optimizing thedevice to work with off-the-shelf surface mount inductors.The device can deliver 5V at 100mA from a 3V input instep-up mode or 5V at 200mA from a 12V input in step-down mode.Switch current limit can be programmed with a singleresistor. An auxiliary open-collector gain block can beconfigured as a low-battery detector, linear post regulator,undervoltage lock-out circuit, or error amplifier.For input sources of less than 2V use the LT111
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