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)