GENERAL DESCRIPTION

The ADM8828/ADM8829 is a charge-pump voltage inverter which may be used to generate a negative supply from a positive input. Input voltages ranging from +1.5 V to +5.5 V can be inverted into a negative –1.5 V to –5.5 V output supply. This inverting scheme is ideal for generating a negative rail in single power-supply systems. Only two small external capacitors are needed for the charge pump. Output currents up to 25 mA with greater than 99 efficiency are achievable.

The ADM8828 also features a low power shutdown (SHDN) pin. This can be used to disable the device and reduce the quies cent current to 20 nA.

The ADM8828/ADM8829 is available in a 6-lead SOT-23 package.

FEATURES

Inverts Input Supply Voltage

99 Voltage Conversion Efficiency

25 mA Output Current

Shutdown Function

Requires Only Two Capacitors

1 mF Capacitors

18 V Output Resistance

+1.5 V to +5.5 V Input Range

600 mA Quiescent Current

20 nA Shutdown Current (ADM8828)

APPLICATIONS

Handheld Instruments

LCD Panels

Cellular Phones

PDAs

Remote Data Acquisition

Op Amp Power Supplies