General Description

The MAX9918/MAX9919/MAX9920 are single-supply, high-accuracy current-sense amplifiers with a high input common-mode range that extends from -20V to +75V. These amplifiers are well suited for current moni toring of inductive loads such as motors and solenoids, where common-mode voltages can become negative due to inductive kickback, reverse-battery conditions, or transient events.

Features

♦ -20V to +75V Input Common-Mode Voltage Range

♦ 400µV (max) Input Offset Voltage

♦ 0.6% (max) Gain Accuracy Error

♦ Uni- or Bidirectional Current Sensing

♦ Reference Input for Bidirectional OUT

♦ 120kHz, -3dB Bandwidth (MAX9919N)

♦ Single-Supply Operation (4.5V to 5.5V)

♦ 1mA Supply Current

♦ 0.5µA (typ) Shutdown Current

♦ Rail-to-Rail Output

♦ -40°C to +125°C Automotive Temperature Range

Applications

  H-Bridge Motor Current Sensing

  Solenoid Current Sensing

  Current Monitoring of Inductive Loads

  High- and Low-Side Precision Current Sensing

  4x4 Transmission Control

  Electronic Throttle Control

  Super-Capacitor Charge/Discharge Monitoring in Hybrid Cars

  Precision High-Voltage Current Monitoring