Analog Devices Inc./Maxim Integrated MAX44286FAZS+T

Overview

MAX44286FAZS+T from Maxim Integrated is a zero-drift, high-side current-sense amplifier with 50V/V fixed gain, 30µV max input offset voltage, 0.23% max gain accuracy, and 12.5µA supply current at +25°C. It operates from 1.6V to 5.5V common-mode input range over –40°C to +125°C and is packaged in a 0.78mm × 0.78mm × 0.35mm 4-bump WLP for precision battery-current monitoring in space-constrained portable medical devices.

For engineers reviewing the MAX44286FAZS+T datasheet, MAX44286FAZS+T pinout, MAX44286FAZS+T application, or MAX44286FAZS+T equivalent, key selection criteria include ultra-low offset drift (≤300nV/°C), guaranteed CMRR ≥120dB across temperature, 200kHz gain-bandwidth product, and compatibility with 1.6V battery monitoring without auxiliary supply rails.

Technical Context

The MAX44286FAZS+T implements autozeroing architecture to achieve near-zero input offset drift over time and temperature, enabling stable nA-level current detection. Its supply voltage is shared with the RS+ pin, eliminating need for separate VCC and allowing direct integration into low-voltage battery rails down to 1.6V.

Internal resistor network (RG = 50kΩ, RA = 50kΩ, RB = 450kΩ) sets fixed 50V/V gain. Output swing is referenced to RS+, with VOH ≤ 50mV and VOL ≤ 65mV under 300µA load, supporting accurate interfacing with low-voltage ADCs.

Key Specifications

Pinout & Package

MAX44286FAZS+T uses a 4-bump wafer-level package (WLP) measuring 0.78mm × 0.78mm × 0.35mm, optimized for minimal PCB footprint in ultra-thin mobile and wearable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA219BIDR and MAX40086AUB+, the MAX44286FAZS+T delivers superior offset stability (30µV vs. 100µV) and lower quiescent current (12.5µA vs. 15–100µA), making it optimal for always-on, analog-output battery monitors where ADC headroom and runtime are constrained.

Availability

MAX44286FAZS+T is available at Aetrix Electronics and suitable for smartphone battery management, portable medical diagnostics, and notebook power rail analysis requiring stable component supply with guaranteed long-term availability.

Supply support for MAX44286FAZS+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, medical, and consumer applications.

The MAX44286 family targets ultra-low-power, high-accuracy current sensing in space-constrained battery-operated devices - emphasizing zero-drift performance, minimal supply current, and direct low-voltage battery rail compatibility.

FAQ

What is the maximum common-mode voltage the MAX44286FAZS+T can handle?

The MAX44286FAZS+T supports a common-mode input range of 1.6V to 5.5V over –40°C to +85°C, and 1.8V to 5.5V over –40°C to +125°C. Absolute maximum RS+ to RS− voltage is +6V, and RS+/RS− to GND is rated from –0.3V to +6V. This allows safe operation on single-cell Li-ion (up to 4.2V) and dual-cell configurations with appropriate derating.

Does the MAX44286FAZS+T require an external power supply pin?

No. The MAX44286FAZS+T derives its operating power directly from the RS+ pin, eliminating the need for a separate VCC connection. This shared supply architecture enables direct integration into battery rails as low as 1.6V and reduces PCB routing complexity in compact portable designs.

What is the output voltage swing limitation of the MAX44286FAZS+T?

The MAX44286FAZS+T output swing is referenced to RS+, not GND. VOH is limited to within 50mV of RS+, and VOL is typically 3–15mV above GND at zero load. Therefore, maximum usable output is V_OUT(MAX) = V_RS+(MIN) – V_SENSE(FS) – V_OH, constraining full-scale sense voltage based on minimum battery voltage.

Can the MAX44286FAZS+T be used for bidirectional current sensing?

Yes - though unidirectional by design, two MAX44286FAZS+T devices can be configured for bidirectional sensing: one with RS+ on battery anode and RS− on load, another with RS+ on charger output and RS− on battery cathode. Their outputs relative to GND provide independent charge and discharge current signals without shared reference errors.

How does the MAX44286FAZS+T achieve ultra-low input offset voltage?

The MAX44286FAZS+T employs an autozeroing technique that periodically samples and cancels input-stage offset during idle phases. This architecture achieves 7µV typical and 30µV maximum input offset voltage at +25°C, with drift limited to 300nV/°C - enabling stable nA-level current measurements across automotive and medical temperature ranges.