Micropower, Step-Up/Step-Down SW Regulator; Adjustable and Fixed 3.3 V, 5 V, 12 V

The ADP1111 is part of a family of step-up/step-down switching regulators that operates from an input voltage supply of 2 V to 12 V in step-up mode and up to 30 V in step-down mode. The ADP1111 can be programmed to operate in step-up/stepdown or inverting applications with only 3 external components.

The fixed outputs are 3.3 V, 5 V and 12 V; and an adjustable version is also available. The ADP1111 can deliver 100 mA at 5 V from a 3 V input in step-up mode, or it can deliver 200 mA at 5 V from a 12 V input in step-down mode.

Maximum switch current can be programmed with a single resistor, and an open collector gain block can be arranged in multiple configuration for low battery detection, as a post linear regulator, undervoltage lockout, or as an error amplifier.

APPLICATIONS

* 3 V to 5 V, 5 V to 12 V Step-Up Converters

* 9 V to 5 V, 12 V to 5 V Step-Down Converters

* Laptop and Palmtop Computers

* Cellular Telephones

* Flash Memory VPP Generators

* Remote Controls

* Peripherals and Add-On Cards

* Battery Backup Supplies

* Uninterruptible Supplies

* Portable Instruments

* Operates from 2 V to 30 V Input Voltage Range

* 72 kHz Frequency Operation

* Utilizes Surface Mount Inductors

* Very Few External Components Required

* Operates in Step-Up/Step-Down or Inverting Mode