Analog Devices Inc./Maxim Integrated MAX6430EGUS+T

Overview

MAX6430EGUS+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 PDAs.

For engineers reviewing the MAX6430EGUS+T datasheet, MAX6430EGUS+T pinout, MAX6430EGUS+T application, or MAX6430EGUS+T equivalent, this page delivers verified electrical specs, dual-threshold timing behavior, SOT143-4 package details, and validated alternative options for low-power battery-state monitoring designs.

Technical Context

The MAX6430EGUS+T implements two independent comparators with internal hysteresis and a 140ms timeout timer to prevent false triggering during battery voltage recovery. Its factory-trimmed thresholds-VHTH− (e.g., 2.7V), VHTH+ (1.05×VHTH−), VLTH− (e.g., 1.8V), and VLTH+ (1.05×VLTH−)-enable precise three-state battery status detection without external components.

It uses BATT as both input voltage source and power supply, eliminating need for separate VDD. The open-drain LBOH/LBOL outputs are compatible with logic levels up to 5.5V, enabling direct interface with higher-voltage microcontrollers while operating from the monitored battery rail.

Key Specifications

Pinout & Package

SOT143-4 package: 1.3mm × 1.3mm body, 0.95mm max height, lead-free (RoHS-compliant), tape-and-reel delivery.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6430EGUS+T, MAX6431EGUS+T offers push-pull drive but sacrifices level-shifting flexibility, while TLV7032IDGKR delivers configurability at the cost of design complexity, higher current draw, and reduced long-term reliability due to external component dependencies.

Availability

MAX6430EGUS+T is available at Aetrix Electronics and suitable for portable medical devices, PDAs, electronic toys, and two-way radios requiring stable component supply and long-term lifecycle support.

Supply support for MAX6430EGUS+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 industrial, medical, and consumer markets.

The MAX6427–MAX6438 family was engineered specifically for ultra-low-power, multi-threshold battery state monitoring in space- and energy-constrained portable electronics - prioritizing integration, accuracy, and zero-external-component operation.

FAQ

What is the function of LBOH and LBOL in MAX6430EGUS+T?

LBOH and LBOL are active-low open-drain outputs in the MAX6430EGUS+T. LBOH asserts when battery voltage falls below the factory-trimmed VHTH− threshold (e.g., 2.7V), signaling "weak battery" to trigger low-power mode. LBOL asserts at a lower VLTH− threshold (e.g., 1.8V), signaling "empty battery" to initiate controlled shutdown. Both remain asserted for ≥140ms after voltage recovery to ensure stability.

Does MAX6430EGUS+T require external resistors or capacitors?

No. MAX6430EGUS+T is a factory-trimmed dual-threshold monitor with internal reference and timing circuitry. It operates with zero external components - only BATT, GND, and pull-up resistors on LBOH/LBOL outputs are required for system interfacing. This eliminates calibration, reduces BOM count, and improves long-term reliability.

What is the minimum battery voltage at which MAX6430EGUS+T remains functional?

MAX6430EGUS+T guarantees valid LBO logic states down to BATT = 1.0V. Its internal circuitry continues accurate comparison and timeout control across the full 1.6V to 5.5V operating range, enabling reliable end-of-discharge signaling even in deeply depleted alkaline or NiMH cells.

Can MAX6430EGUS+T be used with a 5V microcontroller I/O pin?

Yes. The open-drain LBOH and LBOL outputs of MAX6430EGUS+T support pull-up voltages up to 5.5V. When pulled to 5V, they safely interface with 5V-tolerant microcontroller inputs - enabling direct connection without level shifters, even when BATT is only 2.8V (e.g., partially discharged Li+ cell).

How does the 140ms timeout period improve system reliability?

The 140ms minimum timeout in MAX6430EGUS+T prevents output chatter during transient voltage dips caused by load switching or battery recovery. It ensures LBOH/LBOL remain asserted until the supply stabilizes, avoiding premature reactivation of power converters or processors - critical for preventing brownout-induced firmware corruption in embedded systems.