Analog Devices Inc. MAX49918 Bidirectional Current-Sense Amplifiers

Analog Devices Inc. MAX49918 Bidirectional Current-Sense Amplifiers (CSAs) are high-precision CSAs with an I²C programmable gain option from 10V/V to 200V/V in eight steps. The multiple programmable gain options offer maximum flexibility for the user to change the gain on the fly. Operating over a -40°C to +125°C temperature range, the Analog Devices MAX49918 offers a supply voltage of +2.7V to +5.5V with a typical quiescent supply at 0.7mA. The ICs feature bidirectional current sensing and are available in a 3mm x 3mm, 10-pin TDFN package.

These devices feature an operating input common-mode range from -5V to +70V, with protections extending to -6V and up to +80V, providing protection against reverse battery and high-voltage spikes. The low input offset of ±1μV (typical) and low gain error of ±0.01% (typical) make this device best-suited for high-precision current measurements.

Features

Programmable gain options through I²C from 10V/V to 200V/V (8x steps)
Typical input offset voltage
- ±1μV for REF1 = REF2 = V_DD/2
- ±5μV for REF1 = V_DD and REF2 = GND at gain = 20V/V
±0.01% typical gain error

-5V to +70V input voltage range
-6V to +80V protective immunity
70kHz, -3dB bandwidth at gain = 20V/V
145dB DC CMRR
Rail-to-rail output
3mm x 3mm, TDFN-10 package
-40°C to +125°C temperature range

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

Analog Devices Inc. MAX49918 Bidirectional Current-Sense Amplifiers

Features

Applications

Simplified Block Diagram

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