Analog Devices Inc./Maxim Integrated MAX6432MRUS-T

Overview

MAX6432MRUS-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 1.0V to 5.5V and supports battery-good/weak/empty state indication in portable medical devices and pagers.

For engineers reviewing the MAX6432MRUS-T datasheet, MAX6432MRUS-T pinout, MAX6432MRUS-T application, or MAX6432MRUS-T equivalent, this page delivers verified electrical parameters, dual-threshold timing behavior, SOT143-4 package mapping, real-world use cases in low-power shutdown sequencing, and validated alternative parts with documented functional differences.

Technical Context

The MAX6432MRUS-T implements dual independent comparators with internal hysteresis and fixed factory-trimmed thresholds: VHTH− (e.g., 2.8V) and VLTH− (e.g., 2.3V) for LBOH/LBOL assertion, plus corresponding VHTH+ (≈1.05×VHTH−) and VLTH+ (≈1.05×VLTH−) for deassertion after 140ms timeout. Its logic is referenced to BATT, eliminating need for external components.

It uses BiCMOS process technology (905 transistors), guarantees valid LBO logic down to BATT = 1.0V, and remains immune to short battery transients. The device asserts LBOH when BATT falls below VHTH− and LBOL when BATT falls below VLTH−-enabling three-tier battery-state signaling without microcontroller intervention.

Key Specifications

Pinout & Package

SOT143-4 package: 4-pin, lead-free, surface-mount plastic package with exposed pad (not electrically connected). Dimensions: 1.3mm × 1.3mm × 0.95mm, pitch 0.65mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6432MRUS-T, MAX6431MRUS-T offers identical timing and thresholds but different output drive architecture, while TLV809E23DBZR lacks dual-level functionality entirely-making it unsuitable for systems requiring progressive battery-state management.

Availability

MAX6432MRUS-T is available at Aetrix Electronics and suitable for portable medical devices, pagers, PDAs, and electronic toys requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.

Supply support for MAX6432MRUS-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 management, sensing, and interface applications in industrial, medical, and consumer markets.

The MAX6427–MAX6438 family was engineered specifically for ultra-low-power, multi-threshold battery monitoring in space- and energy-constrained portable electronics-emphasizing factory-trimmed accuracy, minimal external components, and robust transient immunity.

FAQ

What is the exact threshold voltage configuration for MAX6432MRUS-T?

The MAX6432MRUS-T is factory-trimmed with VHTH− = 2.8V and VLTH− = 2.3V (per Standard Versions Table, marking "KAEL"). Its corresponding deassertion thresholds are VHTH+ ≈ 2.94V and VLTH+ ≈ 2.415V, providing ~5% hysteresis. These values are laser-trimmed and guaranteed across −40°C to +85°C.

Does MAX6432MRUS-T require external resistors or capacitors?

No. The MAX6432MRUS-T requires zero external components - its thresholds, hysteresis, and 140ms timeout are fully integrated. Unlike adjustable versions (e.g., MAX6436), it draws power directly from BATT and needs only decoupling capacitance if shared with noisy DC-DC converters.

Can MAX6432MRUS-T operate with a single alkaline cell?

Yes. MAX6432MRUS-T operates from 1.0V to 5.5V and maintains valid LBO logic down to BATT = 1.0V. While its standard thresholds (e.g., 2.8V/2.3V) target two- or three-cell alkaline, it remains functional throughout full discharge - though users should verify threshold alignment with their specific battery profile.

How does the 140ms timeout period affect system behavior?

The 140ms timeout in MAX6432MRUS-T enforces a minimum hold time after BATT rises above VHTH+ or VLTH+, ensuring voltage stabilization before deasserting LBOH or LBOL. This prevents oscillation during battery recovery after load removal and avoids spurious wakeups in microcontrollers tied to these outputs.

Is MAX6432MRUS-T pin-compatible with other MAX643x variants in SOT143-4?

Yes - all MAX6430/MAX6431/MAX6432 in SOT143-4 share identical pinout (BATT, LBOH, GND, LBOL). However, output logic type differs: MAX6430 = push-pull, MAX6431 = open-drain, MAX6432 = open-drain. Swapping requires verifying pull-up requirements and MCU input compatibility.