Analog Devices Inc./Maxim Integrated MAX44268EWL+T

Overview

MAX44268EWL+T from Maxim Integrated is an ultra-low-power dual comparator with integrated 1.236V ±1% reference, housed in a 1.3mm × 1.3mm, 9-bump WLP package. It operates from 1.8V to 5.5V supply, draws only 0.7µA per comparator at +25°C, features rail-to-rail inputs extending 200mV beyond rails, and delivers open-drain outputs for mixed-voltage interfacing - ideal for power- and space-constrained battery-powered systems like smartphone power-good monitoring.

For engineers reviewing the MAX44268EWL+T datasheet, MAX44268EWL+T pinout, MAX44268EWL+T application, or MAX44268EWL+T equivalent, key selection considerations include its guaranteed sub-2V operation, internal hysteresis (4–6mV), RF-immune design, crowbar-current-free switching, and 6V-tolerant inputs independent of supply voltage.

Technical Context

The MAX44268EWL+T integrates two independent comparators sharing a single precision reference output on REF/INA−. Its input stage supports common-mode voltages from (GND − 0.2V) to (VCC + 0.2V), enabling robust sensing across supply rails. Each comparator exhibits <0.2nA input bias current and 0.15–10mV input offset voltage over temperature.

Its open-drain outputs support flexible pull-up configurations up to 6V, while internal filtering ensures high RF immunity - critical for mobile wireless environments. Propagation delay ranges from 6µs (tPHL, 5V, 100mV overdrive) to 39µs (tPLH, 5V, 20mV overdrive), with crowbar-current-free switching minimizing dynamic supply surges.

Key Specifications

Pinout & Package

MAX44268EWL+T uses a 1.3mm × 1.3mm, 9-bump Wafer-Level Package (WLP) with bottom-side solder bumps. Bypassing requires 1.0µF capacitor from VCC to GND and 1nF from REF/INA− to GND, placed as close as possible to respective pins.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual comparator with reference applications.

Compared with TLV3691IDCKR and MAX9062ASA+, the MAX44268EWL+T uniquely combines dual comparators, integrated ±1% reference, and 0.7µA/channel operation in a 1.3mm² WLP - delivering lowest total solution size and power for battery-critical window-detection tasks.

Availability

MAX44268EWL+T is available at Aetrix Electronics and suitable for smartphone power sequencing, portable medical sensor wake-up, and wireless earbud accessory detection requiring stable component supply and long-term lifecycle support.

Supply support for MAX44268EWL+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 interface applications in demanding environments.

The MAX44268EWL+T belongs to Maxim's ultra-low-power comparator family, engineered specifically for space- and energy-constrained portable electronics where minimizing footprint and extending battery life are primary design goals.

FAQ

What is the operating temperature range for the MAX44268EWL+T?

The MAX44268EWL+T is specified to operate from −40°C to +85°C. This industrial-grade temperature range ensures reliable performance in smartphones, notebooks, and portable medical devices exposed to ambient environmental variations. All electrical characteristics - including reference voltage accuracy (±1%), input offset voltage (≤10mV), and supply current (≤1.4µA per comparator) - are guaranteed across this full range.

Does the MAX44268EWL+T require external components for basic operation?

The MAX44268EWL+T requires only two external bypass capacitors for stable operation: a 1.0µF capacitor from VCC to GND and a 1nF capacitor from REF/INA− to GND. No external reference, pull-up resistors, or hysteresis components are needed for fundamental window-detection use - the internal 1.236V reference, open-drain outputs, and 4mV hysteresis enable immediate functionality with minimal support circuitry.

Can the MAX44268EWL+T be used for power-on-reset (POR) generation?

Yes, the MAX44268EWL+T is explicitly supported for power-on-reset circuits. Using Comparator A with its internal reference on REF/INA− and Comparator B with an RC timing network on INB+, designers can generate a clean, delay-adjustable reset pulse. The MAX44268EWL+T datasheet provides a validated schematic (Figure 5) and design equations for setting precise reset delay and release thresholds without additional ICs.

How does the MAX44268EWL+T handle input overvoltage conditions?

The MAX44268EWL+T features 6V-tolerant inputs independent of VCC, meaning INA+, REF/INA−, INB+, and INB− withstand −0.3V to +6V regardless of whether the device is powered. This enables safe jack-detection, hot-plug sensing, and battery monitoring in systems where input signals may exceed the supply rail - eliminating the need for external clamping diodes or level translators.

Is the MAX44268EWL+T pin-compatible with other Maxim comparators?

No, the MAX44268EWL+T uses a proprietary 9-bump WLP (1.3mm × 1.3mm) with unique bump assignment (e.g., REF/INA− on A1, N.C. on B2). It is not pin-compatible with larger packages like SOT23-8 or SC70-6 variants of other Maxim comparators. Migration requires PCB redesign and layout validation due to its ultra-compact footprint and bottom-terminal construction.