Analog Devices Inc./Maxim Integrated MAX9028EBT+T

Overview

MAX9028EBT+T from Maxim Integrated is a nanopower, open-drain comparator in a 6-bump UCSP package (1.0mm × 1.52mm), designed for ultra-low-power battery-monitoring systems. It operates from +1.8V to +5.5V, draws only 0.6µA supply current at 1.8V, features Beyond-the-Rails™ inputs extending ±0.2V beyond VEE/VCC, and delivers rail-to-rail output swing up to 5.5V above VEE - ideal for 2-cell Li-ion or alkaline battery voltage supervision.

For engineers reviewing the MAX9028EBT+T datasheet, MAX9028EBT+T pinout, MAX9028EBT+T application, or MAX9028EBT+T equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed use cases in battery management and mixed-voltage logic translation, and two rigorously cross-checked alternative parts with documented functional and application differences.

Technical Context

The MAX9028EBT+T implements a BiCMOS input stage with ±0.15nA typical input bias current and 4mV internal hysteresis, enabling stable switching against noise without external components. Its open-drain output supports pull-up to voltages up to 5.5V above VEE, making it suitable for level-shifting between disparate supply domains.

It uses a crowbar-current-free break-before-make output architecture that limits supply-current surges during transitions, reducing power-supply glitches and eliminating need for large bypass capacitors - critical for long-life coin-cell or energy-harvesting applications.

Key Specifications

Pinout & Package

MAX9028EBT+T is housed in a 6-bump wafer-level chip-scale package (UCSP™), measuring 1.0mm × 1.52mm with bumps on bottom. The package is RoHS-compliant and optimized for space-constrained portable electronics.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar nanopower open-drain comparator applications.

Compared with TLV7011DBVR and MAX40002ANSR+, the MAX9028EBT+T offers the lowest supply current among open-drain comparators with rail-exceeding inputs and 5.5V-tolerant output - making it uniquely suited for battery voltage supervision where both ultra-low power and mixed-voltage interoperability are mandatory.

Availability

MAX9028EBT+T is available at Aetrix Electronics and suitable for 2-cell battery monitoring, ultra-low-power telemetry, and mixed-voltage logic translation requiring stable component supply across industrial, medical, and portable consumer designs.

Supply support for MAX9028EBT+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 power, sensing, and timing applications in harsh, space-, and power-constrained environments.

The MAX9025–MAX9028 family was engineered specifically for nanopower battery supervision and rail-flexible signal conditioning - delivering guaranteed 1.8V operation, sub-1µA current, and Beyond-the-Rails™ input capability in chip-scale packaging.

FAQ

What is the minimum operating voltage for MAX9028EBT+T?

The MAX9028EBT+T is guaranteed to operate down to +1.8V across the full −40°C to +85°C temperature range. At 1.8V supply, its typical supply current is 0.45µA, and input common-mode range extends from VEE − 0.2V to VCC + 0.2V - enabling direct interface with aging alkaline or Li-ion cells without regulation. This specification is production-tested and documented in the Electrical Characteristics table.

Does MAX9028EBT+T include an internal voltage reference?

No, the MAX9028EBT+T does not include an internal voltage reference. It belongs to the "without reference" variant of the MAX9025–MAX9028 family, as confirmed in the Selector Guide and Features section. Only MAX9025/MAX9026 integrate a 1.236V ±1% reference. The MAX9028EBT+T relies on external threshold sources - such as resistor dividers or dedicated references - connected to its IN+ or IN− pins.

What is the maximum allowable voltage on the OUT pin of MAX9028EBT+T?

The OUT pin of MAX9028EBT+T is rated for voltages up to 5.5V above VEE, as specified in the Absolute Maximum Ratings and Output Voltage section. When VEE = 0V (ground), this permits pull-up to +5.5V - supporting robust 5V-to-3V logic translation. This rating is independent of VCC and applies under static conditions; dynamic switching must respect the 10s short-circuit duration limit.

Can MAX9028EBT+T be used for zero-crossing detection?

Yes, MAX9028EBT+T is suitable for zero-crossing detection. With IN− tied to ground and IN+ receiving an AC-coupled signal, its Beyond-the-Rails™ input range (down to VEE − 0.2V) accommodates signals centered at 0V. Internal 4mV hysteresis prevents chatter near the crossing point, and open-drain output allows flexible pull-up to match downstream logic thresholds - all while consuming only 0.6µA.

What package type and dimensions does MAX9028EBT+T use?

MAX9028EBT+T uses a 6-bump UCSP™ (Ultra Compact Silicon Package) measuring 1.0mm × 1.52mm with solder bumps on the bottom side. The top mark is "ADE", and the package is RoHS-compliant (+ suffix). Land pattern and reflow profile details are defined in Maxim Application Note 1891, and mechanical drawings are available at maximintegrated.com/packages.