Analog Devices Inc./Maxim Integrated MAX40056UAUA/V+T

Overview

The MAX40056UAUA/V+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, 10V/V fixed gain, ±5µV typical input offset voltage, and 300kHz bandwidth. It enables accurate phase-current monitoring in motor windings and solenoids while rejecting ±500V/µs PWM edge transients.

For engineers reviewing the MAX40056UAUA/V+T datasheet, MAX40056UAUA/V+T pinout, MAX40056UAUA/V+T application, or MAX40056UAUA/V+T equivalent, key selection criteria include its AEC-Q100 qualification, integrated 1.5V reference with rail-to-rail output, internal window comparator for overcurrent detection, and WLP-8 package compatibility with high-density motor control PCB layouts.

Technical Context

The MAX40056UAUA/V+T employs a chopper-stabilized architecture to achieve ±5µV (typ) input offset voltage and 0.05% (typ) gain error across -40°C to +125°C, enabling precision measurement with low-value sense resistors. Its proprietary input stage suppresses fast PWM edges up to ±500V/µs, delivering 60dB AC CMRR at 50V common-mode with ±500V/µs slew rate.

The device 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 fault indication without external components.

Key Specifications

Pinout & Package

MAX40056UAUA/V+T is housed in a 2.02mm × 1.4mm, 8-bump wafer-level package (WLP) with 0.4mm pitch, optimized for space-constrained motor driver modules and automotive ECUs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A1QDRQ1 and MAX40080FAUA+, the MAX40056UAUA/V+T uniquely combines AEC-Q100 qualification, integrated 1.5V reference, and window comparator in a 2.02mm × 1.4mm WLP-reducing component count and PCB area in space-constrained automotive and industrial motor controllers.

Availability

MAX40056UAUA/V+T is available at Aetrix Electronics and suitable for automotive motor control, industrial servo drives, and battery management systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX40056UAUA/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 precision analog and mixed-signal ICs for automotive, industrial, and communications applications, with emphasis on high-reliability, low-power, and high-performance signal conditioning.

The MAX40056 family targets high-dV/dt motor control systems, delivering PWM-immune current sensing with integrated protection and reference functions to simplify design of robust, compact power stages.

FAQ

What is the gain configuration of the MAX40056UAUA/V+T?

The MAX40056UAUA/V+T has a fixed gain of 10V/V, as indicated by the "U" suffix in the part number per Maxim's ordering guide. This gain setting supports ±180mV input differential range with the internal 1.5V reference and 3.3V supply, enabling use with higher-value sense resistors to reduce power loss while maintaining resolution. The MAX40056UAUA/V+T does not support gain selection via external resistors or pins.

Does the MAX40056UAUA/V+T require an external reference voltage?

No, the MAX40056UAUA/V+T includes an internal 1.5V reference (±1.5mV accuracy, 30ppm/°C drift) accessible at the REF pin, which is sufficient for most bidirectional current sensing applications. An external reference can be applied to override the internal one only if a higher full-scale output swing is needed-for example, with 5V supply and 2.5V external reference-but it is not required for standard operation of the MAX40056UAUA/V+T.

How does the MAX40056UAUA/V+T handle PWM edge transients?

The MAX40056UAUA/V+T uses a proprietary input architecture that recovers from ±500V/µs PWM edges in 500ns, maintaining output stability without saturation. Its AC CMRR is 60dB at 50V common-mode with ±500V/µs slew rate, and DC CMRR reaches 140dB. This enables accurate current sampling during PWM dead-time and prevents erroneous readings in motor phase current feedback loops.

Can the MAX40056UAUA/V+T detect overcurrent conditions without external components?

Yes, the MAX40056UAUA/V+T integrates a window comparator with user-configurable thresholds via the CIP pin. By connecting a resistor divider from REF to CIP, designers set the lower trip point (VCIP); the upper threshold (VA) is automatically generated as (2 × VREF) − VCIP. The COP pin asserts low on overcurrent, providing direct fault signaling without external comparators or logic.

What package type is used for the MAX40056UAUA/V+T?

The MAX40056UAUA/V+T uses a 2.02mm × 1.4mm, 8-bump wafer-level package (WLP) with 0.4mm pitch, identified by package code W81B2+1. This ultra-compact package supports high-density layout in motor driver modules and automotive ECUs, and its thermal resistance (θJA = 74.65°C/W on four-layer board) enables reliable operation at full rated current in confined spaces.