Products
MAX40056F
RECOMMENDED FOR NEW DESIGNSBidirectional Current Sense Amplifier with PWM-Rejection
Enabling Dramatic Size and Performance Improvement for In-Phase Measurement in DC Servo Drives
- Part Models
- 6
- 1ku List Price
- Starting From $1.71
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Overview
- AEC-Q100
- Fast, 500ns PWM Edge recovery from 500V/µs PWM Edges
- 60dB AC CMRR Rejection at 50V, ±500V/µs PWM Edges
- 140dB DC CMRR Rejection
- -0.1V to +65V Input Voltage Range
- -5V to +70V Protective Immunity
- 300kHz, -3dB Bandwidth
- Multiple Gain Options; 10V/V, 20V/V, 50V/V
- Internal, 1% Reference for Bidirectional Offset
- 5µV (Typ) Input Offset Voltage
- Rail-to-Rail Output
- 2.02mm x 1.4mm, 8-bump WLP and 8-pin µMAX
- -40°C to +125°C Temperature Range
The MAX40056 is a bidirectional current-sense amplifier with an input common-mode range that extends from -0.1V to +65V together with protection against negative inductive kickback voltages to -5V. This CSA is well-suited for phase current monitoring of inductive loads, such as motors and solenoids, where pulse width modulation is used to control the drive voltage and current. The MAX40056 uses an improved technique to help reject common-mode input PWM edges with slew rates up to and beyond ±500V/µs. Common mode rejection ratio (CMRR) is typically 60dB (50V, ±500V/µs input) and 140dB DC, typical.
The MAX40056 has an internal +1.5V reference for use with a nominal +3.3V power supply. The reference can also be used to drive an adjoining differential ADC. The reference is used to offset the output to indicate the direction of the input sensed current. The REF pin can source current into external loads and helps to avoid the performance compromises resulting from routing reference voltages across noisy PCBs. Alternatively, for higher supply voltages and higher full-scale output swings, the internal reference can be overridden by a higher voltage, external reference.
The internal or external reference can be used to define the trip threshold for the integrated overcurrent comparator. This can provide immediate indication of an overcurrent fault condition.
The MAX40056 operates over the full -40°C to +125°C temperature range and runs from a supply voltage of +2.7V to +5.5V. It is offered in a 2.02mm x 1.4mm 8-pin wafer-level package (WLP) and 8-pin µMAX packages.
Design Solution: How Less Can Be More in Motor Control Design ›
Applications
- Automotive
- Battery Stack Monitors
- Current Monitoring of Inductive Loads
- PWM H-Bridge Motor In-line/In-phase/Winding Current Sensing
- Solenoid Current Sensing
Documentation
Data Sheet 1
Design Note 1
Technical Articles 2
Video 1
Webcast 1
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| MAX40056FAUA+ | MINI_SO | ||
| MAX40056FAUA+T | MINI_SO | ||
| MAX40056FAUA/V+ | MINI_SO | ||
| MAX40056FAUA/V+T | MINI_SO | ||
| MAX40056FAWA+ | WLCSP | ||
| MAX40056FAWA+T | WLCSP |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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Request a Driver/SoftwareHardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| Current Sense Amplifiers 1 | ||
| MAX9918 | PRODUCTION | -20V to +75V Input Range, Precision Uni-/Bidirectional, Current-Sense Amplifiers |
Tools & Simulations
SPICE Model 1
Evaluation Kits
Evaluation Kit for the MAX40056F, MAX40056T, MAX40056U