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Current-sense amps monitor inductive loads

Posted: 26 Apr 2010 ?? ?Print Version ?Bookmark and Share

Keywords:current-sense amplifier? automotive? MOSFET?

MAX9918/19/20 current-sense amplifier

Maxim Integrated Products has expanded its portfolio of high-side, current-sense amplifiers with MAX9918/MAX9919/MAX9920. Designed for automotive applications, the amplifiers have a wide input common-mode range (-20V to +75V) to protect against beyond-the-rails voltages. These robust devices are well-suited for monitoring 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/MAX9919 feature a 400?V (max) input-offset voltage for precision monitoring, and the MAX9920 provides 900?V (max). The MAX9918/MAX9920 feature adjustable gain that is set by an external resistive-divider network, while the MAX9919 offers fixed gains of 45V/V or 90V/V. All three devices operate as unidirectional amplifiers when VREFIN = GND, and as bidirectional amplifiers when VREFIN = Vcc/2.

The MAX9918/MAX9919/MAX9920 are fully specified over the -40C to +125C automotive temperature range and are available in an 8-pin SO package. Prices start at $0.85 (1000-up, FOB USA).

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