Bidirectional, On-The-Fly Programmable Gain, Current-Sense Amplifier with Wide Measurement Range

The MAX49918 is a high-precision current-sense amplifier (CSA) with an I2C programmable gain option from 10V/V to 200V/V in 8 steps. The multiple programmable gain options offer maximum flexibility for the user to change gain on-the-fly.

The IC operating input common-mode range from -5V to +70V, with protections that extend down to -6V and up to +80V, thus providing protection against reverse-battery and high-voltage spikes.

The low input offset of ±1μV (typ) and low gain error of ±0.01% (typ) make this device best-suited for high-precision current measurements.

The IC operates from a supply voltage of +2.7V to +5.5V with a typical quiescent supply at 0.7mA. The device operates over the full -40°C to +125°C temperature range. The IC features bidirectional current sensing and is offered in a 3mm x 3mm, 10-pin TDFN package.

APPLICATIONS

* Monitoring Distinct Current Levels

* Using the Same Current-Sense Resistors Across Multiple System Variants

* Requires a Non-Typical Gain Value Due to Sense Resistor Constraints

* H-Bridge Motor and Solenoid Current Sensing

* Battery Current Monitoring

* High- and Low-Side Precision Current Sensing

* Programmable Gain Options through I2C from 10V/V to 200V/V (8 steps)

* ±1μV (typ) Input Offset Voltage for REF1 = REF2 = VDD/2

* ±5μV (typ) Input Offset Voltage for REF1 = VDD and REF2 = GND at Gain = 20V/V

* ±0.01% (typ) Gain Error