The ADP1108 is a highly versatile micropower switch- mode dc- dc converter that operates from an input voltage supply as low as 2.0 V and typically starts up from 1.8 V.
The ADP1108 can be programmed into a step- up or step- down dc- to- dc converter with only three external components. The fixed outputs are 3.3 V, 5 V and 12 V. An adjustable version is also available. In step- up mode, supply voltage range is 2.0 V to 12 V, and 30 V in step- down mode. The ADP1108 can deliver 150 mA at 5 V from a 2 AA cell input and 300 mA at 5 V from a 9 V input in step- down mode. Switch current limit can be programmed with a single resistor.
For battery operated and power conscious applications, the ADP1108 offers a very low power consumption of less than 110 µA.
The auxiliary gain block available in ADP1108 can be used as a low battery detector, linear post regulator, under voltage lockout circuit or error amplifier.