Analog Devices Inc./Maxim Integrated MAX6432DHUS-T

Overview

MAX6432DHUS-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 (high-threshold alert) and LBOL (low-threshold shutdown) - 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 cordless phones.

For engineers reviewing the MAX6432DHUS-T datasheet, MAX6432DHUS-T pinout, MAX6432DHUS-T application, or MAX6432DHUS-T equivalent, this device delivers precise dual-level battery monitoring without external components, enabling low-power system state management in space-constrained, battery-operated designs.

Technical Context

The MAX6432DHUS-T implements two independent comparators with internal hysteresis and fixed factory-trimmed thresholds: VHTH− (e.g., 2.8V) and VLTH− (e.g., 2.3V) for assertion, plus VHTH+ (≈1.05×VHTH−) and VLTH+ (≈1.05×VLTH−) for deassertion. Its logic is fully specified from −40°C to +85°C and guarantees valid output down to BATT = 1.0V.

It uses BiCMOS process technology (905 transistors), features push-pull or open-drain output options, and is immune to short battery voltage transients. The 4-pin SOT143-4 package integrates all timing and reference circuitry - no external capacitors or resistors required.

Key Specifications

Pinout & Package

MAX6432DHUS-T is housed in a 4-pin SOT143-4 package (JEDEC MO-178AA), with gull-wing leads, lead-free finish, 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-level battery monitor applications.

Compared with MAX6431DHUS-T, MAX6432DHUS-T offers superior interface flexibility via dual open-drain outputs; compared with TLV809E28DBZR, it delivers essential dual-threshold functionality for staged power management - neither alternative replicates its complete feature set.

Availability

MAX6432DHUS-T is available at Aetrix Electronics and suitable for portable medical devices, cordless phones, legacy cell phones, and electronic toys requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.

Supply support for MAX6432DHUS-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 precision analog, mixed-signal, and power management ICs for industrial, automotive, and consumer applications.

The MAX6427–MAX6438 family was designed specifically for ultra-low-power, high-accuracy battery state monitoring in space- and energy-constrained portable electronics - eliminating external components while delivering robust hysteresis and temperature-stable thresholds.

FAQ

What is the function of the LBOH and LBOL outputs on the MAX6432DHUS-T?

The MAX6432DHUS-T features two independent active-low open-drain outputs: LBOH asserts when battery voltage falls below the factory-trimmed high-threshold (e.g., 2.8V), signaling "battery weak"; LBOL asserts at the lower factory-trimmed threshold (e.g., 2.3V), signaling "battery empty". Both remain asserted for ≥140ms after voltage recovery to prevent chatter. Each output requires an external pull-up resistor to its target logic rail.

Does the MAX6432DHUS-T require external resistors or capacitors to operate?

No. The MAX6432DHUS-T is a fully self-contained dual-threshold battery monitor. Its factory-trimmed thresholds, internal 615mV reference, comparator circuitry, and 140ms timeout timer are integrated - no external resistors, capacitors, or calibration components are needed. This reduces BOM count and PCB area versus adjustable-threshold alternatives like MAX6436.

What is the minimum battery voltage at which the MAX6432DHUS-T guarantees valid output logic?

The MAX6432DHUS-T guarantees valid LBOH and LBOL logic states down to BATT = 1.0V. This ensures reliable shutdown signaling even during deep discharge of alkaline or NiMH cells, preventing system hang-ups or corrupted memory writes that could occur with higher minimum-voltage monitors.

Can the MAX6432DHUS-T monitor a single lithium-ion cell?

Yes. The MAX6432DHUS-T is explicitly qualified for single Li+ cell monitoring (nominal 3.7V, range 3.0–4.2V). Its factory-trimmed thresholds (e.g., 2.8V/2.3V) align with standard Li+ discharge curves, enabling early warning before capacity drops below 10% and safe cutoff before copper shunting occurs near 2.5V.

How does the 140ms timeout period improve system reliability?

The 140ms minimum timeout ensures the MAX6432DHUS-T holds LBOH or LBOL asserted until battery voltage remains stably above the deassertion threshold (VHTH+ or VLTH+) for that duration. This prevents false deassertion during transient recoveries caused by load removal - critical for avoiding premature re-enabling of power converters or microprocessors during unstable supply conditions.