GENERAL DESCRIPTION

The SA58780 is a single amplifier that allows current sensing independent of the supply voltage. The input offset voltage is typically ±500 µV with typical offset drift of ±6 µV/°C. The SA58780 supply current is typically 150 µA and it operates from 3.0 V to 24 V single supply. The input common mode range is selectable for high and low ranges. The amplifIer gain is user selected for a “High” of 100 V/V or a “Low” of 50 V/V.

The SA58780 is ideal for battery charger applications in notebook computers and PDAs.

FEATURES

• Supply voltage range: 3 V to 24 V

• Low supply current: 150 µA (typical)

• Low input offset voltage: ±500 µV (typical)

• Low input offset drift: ±6 µV/°C (typical)

• Power supply rejection ratio (1 kHz): 80 dB (typical)

• Common mode rejection ratio (1 kHz): 100 dB (typical)

• Common mode input range selection:

1.8 V to 24 V (ISEL HIGH);

–0.3 V to VCC – 2.4 V (ISEL LOW)

• Amplifier gain selection:

GSEL HIGH: GV = 100 V/V;

GSEL LOW: GV = 50 V/V

APPLICATIONS

• Notebook computers

• Personal digital assistants (PDA)