Analog Devices Inc./Maxim Integrated MAX6432EIUS-T

Overview

The MAX6432EIUS-T from Maxim Integrated is a dual-output, factory-trimmed battery monitor IC for single Li+ or multi-cell alkaline/NiMH/NiCd power supplies. It provides two active-low open-drain outputs (LBOH and LBOL) with 140ms minimum timeout, ±2.5% threshold accuracy, and 1µA typical supply current. It operates from 1.6V to 5.5V and supports battery-good/weak/empty state indication in portable medical devices and pagers.

For engineers reviewing the MAX6432EIUS-T datasheet, MAX6432EIUS-T pinout, MAX6432EIUS-T application, or MAX6432EIUS-T equivalent, this device delivers precise dual-threshold monitoring without external components - critical for low-power, space-constrained battery management in consumer and portable electronics.

Technical Context

The MAX6432EIUS-T implements two independent comparators with internal hysteresis and fixed factory-trimmed thresholds: VHTH− (e.g., 2.9V) and VLTH− (e.g., 2.4V) for LBOH/LBOL assertion, plus corresponding VHTH+ (≈1.05×VHTH−) and VLTH+ (≈1.05×VLTH−) for deassertion. Its timing logic enforces a guaranteed 140ms minimum timeout before output release after threshold crossing.

It uses BiCMOS process technology (905 transistors), draws only 1µA at 3.7V, and maintains valid LBO logic states down to BATT = 1.0V. The SOT143-4 package enables direct integration into compact battery-powered systems requiring stable, noise-immune voltage supervision.

Key Specifications

Pinout & Package

SOT143-4 surface-mount package with 0.95mm height, lead-free compliant, and tape-and-reel delivery. Pin 1 = BATT, Pin 2 = LBOH, Pin 3 = GND, Pin 4 = LBOL.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-threshold battery monitor applications.

Compared with MAX6431EIUS-T, the MAX6432EIUS-T provides higher upper/lower thresholds for later-stage battery warning; compared with TLV7032IDR, it delivers plug-and-play supervision with guaranteed timing and zero external components - reducing design cycle time by ~3 weeks and test validation scope by 70%.

Availability

MAX6432EIUS-T is available at Aetrix Electronics and suitable for portable medical devices, pagers, and electronic toys requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX6432EIUS-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 high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and consumer applications.

The MAX6427–MAX6438 family was designed specifically for ultra-low-power, component-minimized battery state monitoring in space- and energy-constrained portable electronics - delivering factory-calibrated precision without external passive components.

FAQ

What is the exact threshold voltage configuration for MAX6432EIUS-T?

The MAX6432EIUS-T features factory-trimmed dual thresholds: VHTH− = 2.90V and VLTH− = 2.40V (with corresponding VHTH+ ≈ 3.05V and VLTH+ ≈ 2.52V). These values are laser-trimmed during production and specified in the MAX6432 data sheet Table 1 (code EI). The MAX6432EIUS-T asserts LBOH below 2.90V and LBOL below 2.40V, both with ±2.5% tolerance over temperature.

Does MAX6432EIUS-T require external resistors or capacitors?

No, the MAX6432EIUS-T requires no external components. Its factory-trimmed thresholds, internal 615mV reference, comparator hysteresis, and 140ms timeout timer are fully integrated. Only external pull-up resistors (for open-drain LBOH/LBOL) and standard decoupling (optional 0.1µF) are recommended - no resistive dividers, timing caps, or calibration circuitry needed.

Can MAX6432EIUS-T operate down to 1.0V battery voltage?

Yes, the MAX6432EIUS-T guarantees valid logic states on LBOH and LBOL outputs down to BATT = 1.0V, per Absolute Maximum Ratings and Electrical Characteristics tables. This ensures reliable shutdown signaling even as the battery reaches end-of-life, preventing unsafe deep discharge of Li+ cells or leakage in alkaline systems.

What is the package type and pin compatibility of MAX6432EIUS-T?

The MAX6432EIUS-T is supplied in a 4-pin SOT143-4 package (1.3mm × 2.1mm × 0.95mm) with pinout: Pin 1 = BATT, Pin 2 = LBOH, Pin 3 = GND, Pin 4 = LBOL. It shares footprint and pinout with other MAX6430–MAX6432 variants in US-T suffix (e.g., MAX6430DHUS-T), enabling drop-in substitution within the same threshold family.

How does the 140ms timeout function in MAX6432EIUS-T?

The MAX6432EIUS-T enforces a minimum 140ms timeout period after BATT rises above VHTH+ or VLTH+ before deasserting LBOH or LBOL. This ensures the battery voltage has stabilized post-load-removal - preventing premature re-enabling of system functions due to transient recovery spikes. The timeout is internally generated and temperature-compensated (±10% variation over -40°C to +85°C).