GENERAL DESCRIPTION

The ADP3000 is a versatile step-up/step-down switching regulator. It operates from an input supply voltage of 2 V to 12 V in step-up mode, and from 2 V to 30 V in step-down mode.

Operating in pulse frequency mode (PFM), the device consumes only 500 µA, making it ideal for applications requiring low quiescent current. It delivers an output current of 180 mA at 3.3 V from a 2 V input in step-up mode, and an output current of 100 mA at 3 V from a 5 V input in step-down mode.

The ADP3000 operates at 400 kHz switching frequency. This allows the use of small external components (inductors and capacitors), making it convenient for space-constrained designs.

The auxiliary gain amplifier can be used as a low battery detector, linear regulator, undervoltage lockout, or error amplifier.

FEATURES

Operates at supply voltages from 2 V to 30 V

Works in step-up or step-down mode

Very few external components required

High frequency operation up to 400 kHz

Low battery detector on-chip

User-adjustable current limit

Fixed and adjustable output voltage

8-lead PDIP, 8-lead SOIC, and 14-lead TSSOP packages

Small inductors and capacitors

APPLICATIONS

Notebook, palmtop computers

Cellular telephones

Hard disk drives

Portable instruments

Pagers