Analog Devices Inc./Maxim Integrated MAX4376FAUK/V+T

Overview

MAX4376FAUK/V+T from Maxim Integrated is a single-channel, high-side current-sense amplifier with fixed +50V/V gain, 0–28V input common-mode range independent of supply voltage, ±0.5% typical full-scale accuracy at +25°C, and operation across -40°C to +125°C for automotive battery monitoring and charger control loops.

For engineers reviewing the MAX4376FAUK/V+T datasheet, MAX4376FAUK/V+T pinout, MAX4376FAUK/V+T application, or MAX4376FAUK/V+T equivalent, key selection criteria include gain-matched output scaling (50×), buffered 2mA drive capability, 2MHz bandwidth at G=50, AEC-Q100 qualification, and SOT23-5 package compatibility with space-constrained power rails.

Technical Context

The MAX4376FAUK/V+T implements a precision BiCMOS-based high-side sensing architecture with internal gain-setting resistors and a buffered voltage output stage. Its input common-mode range extends from 0V to +28V regardless of VCC, enabling accurate current measurement during deep battery discharge.

It delivers 2MHz small-signal bandwidth at G=50, 10V/µs slew rate, and <1µs saturation recovery-critical for real-time feedback in switching regulator and battery-charger control systems operating from +3V to +28V supply.

Key Specifications

Pinout & Package

The MAX4376FAUK/V+T is housed in a RoHS-compliant 5-pin SOT23 package (package code U5+2A, outline 21-0057) with exposed pad thermal enhancement and JEDEC-standard footprint (land pattern 90-0174).

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A1QDRQ1 and MAX40086AUB+T, the MAX4376FAUK/V+T provides optimal balance of fixed +50V/V scaling, AEC-Q100 qualification, 0–28V common-mode coverage, and SOT23-5 footprint-making it ideal for cost-sensitive, high-volume automotive and portable battery-monitoring designs requiring no configuration overhead.

Availability

MAX4376FAUK/V+T is available at Aetrix Electronics and suitable for automotive battery monitoring, notebook fuel gauges, and portable-device power management requiring stable component supply, AEC-Q100 compliance, and long-term lifecycle support.

Supply support for MAX4376FAUK/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) is a semiconductor company specializing in precision analog, mixed-signal, and power-management ICs for automotive, industrial, and computing applications.

The MAX4376 family was designed specifically for high-accuracy, high-common-mode, high-side current sensing in battery-powered and automotive systems where ground-path integrity and wide voltage range are critical.

FAQ

What is the gain setting of MAX4376FAUK/V+T and how is it implemented?

The MAX4376FAUK/V+T has a fixed gain of +50V/V, implemented via internal laser-trimmed resistors within its BiCMOS process. This eliminates external gain-setting components and ensures ±0.5% gain accuracy at +25°C and ±2.5% over -40°C to +125°C. The gain is hardwired and not adjustable; for other gains, use MAX4376TAUK/V+T (G=20) or MAX4376HAUK/V+T (G=100). This fixed architecture simplifies layout and improves long-term stability in the MAX4376FAUK/V+T.

Does MAX4376FAUK/V+T support bidirectional current sensing?

The MAX4376FAUK/V+T is a unidirectional high-side current-sense amplifier optimized for positive current flow from RS+ to RS−. It does not inherently support true bidirectional sensing, as its output saturates near 0V for negative differential inputs. However, with external circuitry (e.g., level-shifting op-amp or dual-supply configuration), it can be adapted for limited bidirectional use-though dedicated devices like MAX4377 are recommended for native bidirectional applications. The MAX4376FAUK/V+T's primary role remains accurate forward-current monitoring.

What is the meaning of "/V" in MAX4376FAUK/V+T?

The "/V" suffix in MAX4376FAUK/V+T denotes AEC-Q100 qualification for automotive applications, covering stress testing across temperature, humidity, vibration, and ESD per Grade 1 requirements (-40°C to +125°C). It also indicates enhanced process controls, lot traceability, and extended reliability validation beyond commercial-grade parts. This makes the MAX4376FAUK/V+T suitable for under-hood, infotainment, and body-control modules where functional safety and long-term stability are mandatory.

Can MAX4376FAUK/V+T operate with a 3.3V supply while monitoring a 24V battery rail?

Yes. The MAX4376FAUK/V+T features a common-mode input range of 0V to +28V that is fully independent of VCC. With VCC = 3.3V, it accurately amplifies the sense voltage (VRS+ − VRS−) across a 24V battery rail-outputting 50× that differential (e.g., 100mV sense → 5.0V output). Its power-supply rejection ratio (PSR) exceeds 66dB, ensuring minimal supply noise coupling. This capability is core to the MAX4376FAUK/V+T's design for low-voltage logic interfacing with high-voltage power domains.

What package type and footprint does MAX4376FAUK/V+T use?

The MAX4376FAUK/V+T uses a 5-pin SOT23 package (outline 21-0057, land pattern 90-0174) with RoHS-compliant lead finish and thermal-enhanced construction. Its compact 2.9mm × 1.6mm footprint supports high-density PCB layouts in space-constrained applications like smartphone power rails or automotive ECUs. The package code "U5+2A" confirms SOT23-5 with exposed pad; no heatsink is required for typical 1mA operation, but thermal vias are recommended for sustained high-CMR conditions. This matches the physical form factor of the MAX4376FAUK/V+T exactly.