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MAX9918：-20V to +75V Input Range, Precision Uni-/Bidirectional, Current-Sense Amplifiers

Current-Sense Amplifiers with Input Common Range that Extends Well Below Ground (-20V)

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 monitoring 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. The MAX9918/MAX9920 feature adjustable gain set by an external resistive-divider network. The MAX9919 features fixed gains of 45V/V (MAX9919F) and 90V/V (MAX9919N). The MAX9918/MAX9919/MAX9920 operate as unidirectional amplifiers when VREFIN = GND and as bidirectional amplifiers when VREFIN = VCC/2. The MAX9920 attenuates the input signal by a factor of 4 at the input level-shifting stage allowing the device to sense voltages up to 200mV (unidirectional operation) or ±100mV (bidirectional operation). The MAX9918/MAX9919/MAX9920 operate with a single 5V supply voltage, are fully specified over the -40°C to +125°C automotive temperature range, and are available in an 8-pin SOIC package.

Key Features Reduce Protective Clamping for High Inductive Kickback Voltage -20V to +75V Input Common-Mode Voltage Range Supports Wide Range of Precision AC and DC Current Sensing Applications Uni- or Bidirectional Current Sensing 0.6% (max) Gain Accuracy Error 400µV (max) Input Offset Voltage 120kHz, -3dB Bandwidth (MAX9919N) Reference Input for Bidirectional OUT Rail-to-Rail Output Saves Board Space 8-Pin SOIC Package Single-Supply Operation (4.5V to 5.5V)

MAX9918, MAX9919, MAX9920: Typical Operating Circuit Applications/Uses Current Monitoring of Inductive Loads H-Bridge Motor Current Sensing High- and Low-Side Precision Current Sensing Precision High-Voltage Current Monitoring Solenoid Current Sensing Super-Capacitor Charge/Discharge Monitoring

DataSheet

Parametrics

Design kits & evaluation modules

• MAX9918EVKIT

Quality and Environmental Data

• MAX9918.pdf

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Ordering Information