GENERAL DESCRIPTION

The SGM3207 generates an unregulated negative output

voltage from an input voltage ranging from 1.4V to 5.5V.

The device is typically supplied by a pre-regulated supply

rail of 5V or 3.3V. Due to its wide input voltage range, two

or three NiCd, NiMH, or alkaline battery cells, as well as

one Li-ion cell can also power them.

Only three external capacitors are required to build a

complete DC/DC charge pump inverter. Assembled in a

small package, the complete converter can be built on a

50mm2

board area. Additional board area and component

count reduction is achieved by replacing the Schottky

diode that is typically needed for start-up into load by

integrated circuitry.

The SGM3207 can deliver a maximum output current of

60mA with a typical conversion efficiency of greater than

85% over a wide output current range. The fixed

switching frequency is 19kHz.

The SGM3207 is available in SOT-23-5 package. It

operates over an ambient temperature range of -40℃ to

+85℃.

FEATURES

? Inverts Input Supply Voltage

? Up to 60mA Output Current

? Input Voltage Range from 1.4V to 5.5V

? Quiescent Current: 72μA (TYP)

? Integrated Active Schottky Diode for Start-Up into

Load

? -40℃ to +85℃ Operating Temperature Range

? Available in Green SOT-23-5 Package

APPLICATIONS

LCD Bias

GaAs Bias for RF Power Amps

Sensor Supply in Portable Instruments

Bipolar Amplifier Supply