Analog Devices Inc. MAX49921 Current-Sense Amplifier (CSA)
Analog Devices MAX49921 Current-Sense Amplifier (CSA) is optimized for current monitoring of inductive loads, such as DC motors and solenoids, where common-mode voltages can become negative due to inductive kickback, reverse-battery conditions, or transient events. The MAX49921 features an operating input common-mode range from 0V to +70V, and the device is protected against input common-mode voltages down to -42V and up to +80V. This design protects against reverse- battery and high-voltage spikes.
The low input offset of ±0.5μV (typical) and low gain error of ±0.05% (typical) make the unidirectional MAX49921 CSA ideal for high-precision current measurements.
The Analog Devices MAX49921 operates from a supply voltage of +2.7V to +5.5V with a typical quiescent supply at 0.7mA. This device is specified over the -40°C to +125°C automotive temperature range and is AEC-Q100 qualified. The Analog Devices MAX49921 CSA is offered in a 2mm x 3mm, side-wettable TDFN8 package with gain options of 20V/V and 50V/V.
Features
- AEC-Q100 qualified for automotive applications
- 7V to 5.5V supply voltage
- 7mA (typical) supply current
- ±0.5μV (typical) input offset voltage
- ±0.05% (typical) gain error
- 0 to +70V input voltage range
- -42V to +80V protective immunity
- 65kHz, -3dB bandwidth
- 140dB DC CMRR
- 20V/V and 50V/V gain options
- Rail-to-rail output
- -40°C to +125°C automotive temperature range
- 2mm x 3mm TDFN8 package
- RoHS compliant
Applications
- Solenoid current sensing
- Battery current monitoring
- Current monitoring of inductive loads
- High- and low-side precision current sensing
- Super-capacitor charge/discharge monitoring
- Precision high-voltage current monitoring
- Automotive current sensing
Videos
Block Diagram
Typical Application Circuits
Development Tool
Analog Devices Inc. MAX49921 Evaluation Kit (MAX49921EVKIT)
Demonstration reference design based on the MAX49921 Current-Sense Amplifier.
Published: 2020-12-07
| Updated: 2024-07-31