Analog Devices Inc./Maxim Integrated MAX4376HAUK+T

Overview

MAX4376HAUK+T from Maxim Integrated is a single-channel, high-side current-sense amplifier with fixed +100V/V gain, 0–28V input common-mode range independent of supply voltage, ±0.5% typical full-scale accuracy at +25°C, and 1.2MHz bandwidth. It operates from +3V to +28V, draws 1mA supply current, and targets battery-charger feedback loops and fuel-gauge circuits in automotive and portable systems.

For engineers reviewing the MAX4376HAUK+T datasheet, MAX4376HAUK+T pinout, MAX4376HAUK+T application, or MAX4376HAUK+T equivalent, key selection criteria include its 100× fixed gain, SOT23-5 package footprint, buffered 2mA-output voltage interface, -40°C to +125°C automotive temperature rating, and high-accuracy operation down to 0V common-mode voltage.

Technical Context

The MAX4376HAUK+T implements a precision high-side sensing architecture using an internal current-mirror-based amplifier with fixed +100V/V gain, enabling direct conversion of sense-resistor voltage drop (V_RS+ – V_RS−) into a ground-referenced output voltage without external gain-setting resistors. Its input common-mode range remains functional from 0V to +28V regardless of V_CC, supporting deep-discharge battery monitoring.

It features a buffered rail-to-rail-capable output stage delivering up to 2mA into a ground-referenced load, with 1µs saturation recovery time and 400ns/800ns setting time for 6.25mV–100mV step transitions. Power-supply rejection exceeds 66dB across +3V to +28V supply variation.

Key Specifications

Pinout & Package

MAX4376HAUK+T is housed in a RoHS-compliant 5-pin SOT23 package (outline 21-0057, land pattern 90-0174), with thermal resistance θ_JA = 255.9°C/W on multi-layer board.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA219AIDR and MAX4080TASA+, the MAX4376HAUK+T uniquely delivers +100V/V analog gain in SOT23-5 with 1.2MHz bandwidth and 0–28V common-mode support-enabling high-resolution, high-speed, high-voltage analog current feedback without digital overhead or supply limitation.

Availability

MAX4376HAUK+T is available at Aetrix Electronics and suitable for automotive load monitoring, battery fuel gauging, and portable-system power management requiring stable component supply across extended temperature and voltage ranges.

Supply support for MAX4376HAUK+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, mixed-signal, and power-management ICs for demanding industrial, automotive, and computing applications.

The MAX4376 family delivers high-side current sensing with internal gain for battery-powered and automotive systems where ground-path integrity, wide common-mode range, and analog loop compatibility are essential.

FAQ

What is the gain configuration of MAX4376HAUK+T and how is it implemented?

The MAX4376HAUK+T has a fixed +100V/V gain implemented via internal laser-trimmed resistors and current-mirror topology-no external components required. This gain is factory-set and unchangeable; the 'H' suffix in the part number explicitly denotes the 100× version. The device outputs V_OUT = 100 × (V_RS+ – V_RS−), enabling direct interface with 0–3.3V or 0–5V ADCs when paired with appropriate sense resistors. MAX4376HAUK+T maintains this gain accuracy across its full operating temperature and supply range.

Does MAX4376HAUK+T support bidirectional current sensing?

MAX4376HAUK+T is inherently unidirectional-it outputs a positive voltage proportional to (V_RS+ – V_RS−) only and does not resolve polarity reversal. However, bidirectional operation can be achieved externally using dual MAX4376HAUK+T devices or by adding a level-shifting circuit to detect negative differential inputs. The datasheet confirms RS− can tolerate reverse bias (V_RS− > V_RS+), but the output saturates near ground and provides no signed indication. For native bidirectional sensing, Maxim recommends the MAX4377 dual variant instead of MAX4376HAUK+T.

What is the maximum allowable sense resistor voltage (V_SENSE) for MAX4376HAUK+T?

The absolute maximum differential input voltage for MAX4376HAUK+T is ±8V, but the specified full-scale sense voltage is 150mV-beyond which output linearity degrades and total error increases significantly. Operating at V_SENSE > 150mV risks clipping and invalidates the ±0.5% accuracy specification. For optimal performance, V_SENSE should remain ≤100mV (the nominal full-scale point), yielding a maximum output of 10V with MAX4376HAUK+T's +100V/V gain. Exceeding 100mV requires derating accuracy per the "Total Output Error vs. Full-Scale Sense Voltage" curve (Figure toc08).

Can MAX4376HAUK+T operate with a supply voltage lower than its common-mode input range?

Yes-MAX4376HAUK+T's 0–28V input common-mode range is fully independent of V_CC. It functions correctly even when V_CC = +3V while sensing a +24V rail (e.g., automotive battery), or when V_CC = +5V while monitoring a +28V DC-DC output. This decoupling is enabled by its proprietary BiCMOS input stage and is validated across the full -40°C to +125°C range. The device remains operational down to V_CC = +3V, making MAX4376HAUK+T suitable for low-power systems where supply rails are constrained but sensing voltages are not.

Is MAX4376HAUK+T qualified for automotive applications?

Yes-MAX4376HAUK+T is AEC-Q100 qualified (Grade 1: -40°C to +125°C ambient) and listed in Maxim's official ordering information as an automotive-grade part. It undergoes stress testing including HTOL, temperature cycling, and ESD per AEC-Q100 Rev H, and carries the '/V' designation in alternate variants (e.g., MAX4376HAUK/V+T). The MAX4376HAUK+T shares identical die and qualification data with its automotive-labeled siblings, and its SOT23-5 package meets mechanical and thermal requirements for under-hood deployment. All electrical specs in the datasheet are guaranteed across the full automotive temperature range.