Analog Devices Inc./Maxim Integrated MAX40056FAWA+T

Overview

The MAX40056FAWA+T from Maxim Integrated is a bidirectional current-sense amplifier optimized for PWM-driven inductive loads, featuring -0.1V to +65V input common-mode range, 50V/V fixed gain, ±5µV typical input offset voltage, and 300kHz bandwidth. It enables accurate phase-current monitoring in motor control systems with integrated overcurrent detection via window comparator.

For engineers reviewing the MAX40056FAWA+T datasheet, MAX40056FAWA+T pinout, MAX40056FAWA+T application, or MAX40056FAWA+T equivalent, this device delivers fast 500ns PWM edge recovery, 60dB AC CMRR at ±500V/µs edges, rail-to-rail output, internal 1.5V reference, and AEC-Q100 qualification - critical for automotive and industrial motor-phase sensing where precision, noise immunity, and fault response are essential.

Technical Context

The MAX40056FAWA+T employs a chopper-stabilized architecture to achieve ±5µV (typ) input offset and <0.05% (typ) gain error across -40°C to +125°C, enabling high-accuracy current measurement with low-value sense resistors. Its proprietary input stage rejects fast PWM transients up to ±500V/µs while maintaining 60dB AC CMRR at 50V common-mode voltage.

It integrates a 1.5V internal reference (±1.5mV accuracy, 30ppm/°C drift) that offsets the output to indicate current direction and serves as threshold reference for the dual-threshold window comparator. The comparator features 40mV hysteresis and push-pull COP output for immediate overcurrent fault signaling without external components.

Key Specifications

Pinout & Package

MAX40056FAWA+T is housed in a 2.02mm × 1.4mm, 8-bump wafer-level package (WLP) with bottom-side solder bumps. This ultra-compact, thermally efficient package supports high-density PCB layouts in space-constrained motor control modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A1QDRQ1 and ACS724LLCTR-20AU-T, the MAX40056FAWA+T uniquely combines 50V/V gain, 500ns PWM recovery, integrated window comparator, and WLP packaging - making it optimal for space-constrained, high-dynamic-response motor phase sensing where analog fault signaling and minimal layout overhead are critical.

Availability

MAX40056FAWA+T is available at Aetrix Electronics and suitable for automotive motor control, industrial servo drives, and battery management systems requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.

Supply support for MAX40056FAWA+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 precision analog and mixed-signal ICs for demanding industrial, automotive, and communications applications.

The MAX40056 family was developed specifically for high-fidelity, high-speed current sensing in PWM-driven motor and solenoid systems - emphasizing PWM-edge rejection, wide common-mode range, and integrated fault detection to simplify safety-critical power stage design.

FAQ

What is the exact gain configuration of the MAX40056FAWA+T?

The MAX40056FAWA+T is the 'F' variant of the MAX40056 family and has a fixed gain of 50V/V, as confirmed in the Electrical Characteristics table and Ordering Information section of the datasheet. This gain is laser-trimmed at wafer test and does not require external resistors. The 'F' suffix explicitly denotes 50V/V, distinguishing it from the 'T' (20V/V) and 'U' (10V/V) variants. Gain error remains ≤0.5% over -40°C to +125°C.

Does the MAX40056FAWA+T support external reference override, and what is the threshold?

Yes, the MAX40056FAWA+T supports external reference override: when a voltage >1.65V (and

How does the integrated window comparator in the MAX40056FAWA+T function?

The MAX40056FAWA+T features an internal window comparator that monitors the OUT voltage against two thresholds: a user-defined lower threshold (VCIP, set via resistor divider from REF) and an internally generated upper threshold (VA = 2×VREF − VCIP). When OUT falls below VCIP or rises above VA, the COP pin asserts low. Hysteresis of 40mV prevents chatter near trip points, and propagation delay is 12–14µs, enabling fast fault response without external components.

What package type and dimensions does the MAX40056FAWA+T use?

The MAX40056FAWA+T uses a wafer-level package (WLP) with package code W81B2+1, measuring 2.02mm × 1.4mm with 8 solder bumps. This is distinct from the µMAX (U8+4) option used by other MAX40056 variants. The WLP offers superior thermal performance (θJA = 74.65°C/W on four-layer board) and minimal PCB footprint - critical for high-density motor driver modules where space and thermal management are constrained.

Is the MAX40056FAWA+T qualified for automotive applications?

Yes, the MAX40056FAWA+T is AEC-Q100 qualified (Grade 0, -40°C to +150°C junction temperature), as stated in the Benefits and Features section and verified in the Ordering Information table. It meets stress testing requirements for automotive environments including temperature cycling, humidity bias, and ESD. This qualification covers the full operating range (-40°C to +125°C ambient) and validates reliability for under-hood motor control and body electronics applications.