Analog Devices Inc./Maxim Integrated MAX40056FAUA/V+T

Overview

The MAX40056FAUA/V+T from Maxim Integrated is a bidirectional current-sense amplifier (CSA) designed for high-accuracy in-phase motor winding current monitoring under PWM control, featuring -0.1V to +65V input common-mode range, 50V/V fixed gain, ±5µV typical input offset voltage, and 300kHz -3dB bandwidth. It enables precise bidirectional current measurement in H-bridge motor drives and solenoid controls with integrated overcurrent detection.

For engineers reviewing the MAX40056FAUA/V+T datasheet, MAX40056FAUA/V+T pinout, MAX40056FAUA/V+T application, or MAX40056FAUA/V+T equivalent, key selection criteria include PWM edge rejection up to ±500V/µs, internal 1.5V reference with 1% accuracy, rail-to-rail output swing, AEC-Q100 qualification, and compatibility with Kelvin-sensed shunt resistors in automotive and industrial motor control systems.

Technical Context

The MAX40056FAUA/V+T employs a chopper-stabilized architecture to achieve ±5µV typical input offset voltage and <0.05% typical gain error across -40°C to +125°C, enabling accurate low-value shunt measurements. Its proprietary input stage rejects fast PWM edges with ±500V/µs slew rates, recovering in 500ns while maintaining 60dB AC CMRR at 50V common-mode voltage.

It integrates a window comparator with user-configurable thresholds via the CIP pin and a push-pull COP output for immediate fault indication. The internal 1.5V reference offsets the OUT pin to indicate current direction, and can be overridden by an external reference up to 1.75V to extend full-scale output swing under higher VDD conditions.

Key Specifications

Pinout & Package

MAX40056FAUA/V+T is housed in an 8-pin µMAX package (2.02mm × 1.4mm footprint, U8+4 code), optimized for space-constrained motor control PCBs with thermal resistance θ_JA = 206°C/W on multilayer boards.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bidirectional current-sense amplifier applications.

Compared with INA240A1QDRQ1 and MAX40057FAUA+, the MAX40056FAUA/V+T delivers highest gain (50V/V) and integrated fault signaling in the smallest µMAX package-making it optimal for space-constrained, high-bandwidth automotive motor controllers needing immediate overcurrent response without external components.

Availability

MAX40056FAUA/V+T is available at Aetrix Electronics and suitable for automotive electric power steering (EPS), industrial servo drives, and 48V battery management systems requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.

Supply support for MAX40056FAUA/V+T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated, now part of Analog Devices, designs high-performance analog and mixed-signal ICs for automotive, industrial, and communications markets, emphasizing signal integrity, power efficiency, and reliability.

The MAX40056FAUA/V+T belongs to Maxim's precision current-sense amplifier product line, engineered specifically for robust operation in noisy PWM-driven motor control environments with integrated diagnostics and AEC-Q100 qualification.

FAQ

What is the exact gain setting of the MAX40056FAUA/V+T?

The MAX40056FAUA/V+T has a fixed gain of 50V/V, as indicated by the "F" suffix in the part number per Maxim's ordering guide. This gain enables ±30mV full-scale differential input range when used with the internal 1.5V reference and 3.3V supply, supporting low-resistance shunt designs with minimal power loss. The gain is laser-trimmed and guaranteed to have ≤0.5% error over -40°C to +125°C.

Does the MAX40056FAUA/V+T require external components for basic operation?

Yes-the MAX40056FAUA/V+T requires a minimum of two external capacitors: a 10nF COG/NPO and a 1µF X5R capacitor from VDD to GND for supply decoupling. Additionally, the REF pin must be bypassed with the same capacitor pair. For overcurrent detection, an external resistor divider from REF to CIP sets the lower threshold; no external op-amps or comparators are needed due to the integrated window comparator.

Can the internal 1.5V reference of the MAX40056FAUA/V+T be disabled or overridden?

Yes-the MAX40056FAUA/V+T's internal 1.5V reference is automatically overridden when an external voltage ≥1.65V is applied to the REF pin. This allows users to extend the output common-mode voltage and full-scale range-for example, using a 2.5V reference with 5V supply increases the differential input range to ±50mV. The internal reference remains active only when REF is left unconnected or driven below 1.65V.

How does the MAX40056FAUA/V+T handle PWM noise during motor commutation?

The MAX40056FAUA/V+T uses a proprietary input stage that recovers from ±500V/µs PWM edges in 500ns while maintaining 60dB AC CMRR at 50V common-mode voltage. Its chopper-stabilized architecture suppresses switching-induced offset shifts, and the internal ESD clamping structure protects against -5V to +70V transients-ensuring clean current waveforms even during hard-switching in 48V H-bridge inverters.

Is the MAX40056FAUA/V+T pin-compatible with other variants in the MAX40056 family?

Yes-MAX40056FAUA/V+T shares identical 8-pin µMAX pinout and footprint with MAX40056TAUA+ (20V/V) and MAX40056UAAU+ (10V/V), enabling drop-in replacement across gain options without PCB redesign. All variants use the same U8+4 land pattern, thermal pad configuration, and pin functions-including RS+, RS-, REF, OUT, COP, CIP, VDD, and GND-facilitating design flexibility and gain optimization during prototyping.