Analog Devices Inc./Maxim Integrated MAX6437UT+T

Overview

MAX6437UT+T from Maxim Integrated is a dual-output, user-adjustable battery monitor IC for low-power portable systems. It provides two independent active-low open-drain outputs (LBOH and LBOL) with 140ms minimum timeout, operates from 1.6V to 5.5V supply, consumes only 1µA typical quiescent current, and supports hysteresis programming via external resistor dividers - enabling precise battery state detection in Li+ or multi-cell alkaline/NiMH systems.

For engineers reviewing the MAX6437UT+T datasheet, MAX6437UT+T pinout, MAX6437UT+T application, or MAX6437UT+T equivalent, key selection criteria include dual-threshold programmability, guaranteed LBO logic validity down to 1.0V battery voltage, immunity to short voltage transients, and compatibility with microprocessor NMI or DC-DC converter shutdown control in space-constrained designs.

Technical Context

The MAX6437UT+T implements two high-impedance comparator inputs (HTHIN and LTHIN), each referenced to internal 585mV/615mV precision references, enabling independent high- and low-battery threshold setting via external resistor networks. Its timing circuit enforces a 140–280ms deassertion delay after threshold crossing to prevent chatter during battery recovery.

It features dual open-drain outputs (LBOH and LBOL) with separate assertion/deassertion thresholds - LBOH triggers on HTHIN falling below VHTHIN− (~585mV) and releases when HTHIN rises above VHTHIN+ (~615mV); LBOL triggers on LTHIN falling below VLTHIN− (~585mV) and releases when LTHIN rises above VLTHIN+ (~615mV) - delivering three-state battery status signaling without external logic.

Key Specifications

Pinout & Package

MAX6437UT+T is housed in a lead-free 6-pin SOT23-6 package (2.9mm × 1.6mm × 1.1mm), optimized for high-density portable PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6436UT+T and TLV7032IDR, the MAX6437UT+T delivers production-ready dual-threshold battery management in minimal footprint and current - reducing design effort by eliminating discrete timing components, reference ICs, and validation overhead for low-voltage reliability.

Availability

MAX6437UT+T is available at Aetrix Electronics and suitable for portable medical devices, Li+ battery-powered PDAs, electronic toys with alkaline cells, and wireless remote controls requiring stable component supply and long-term lifecycle support.

Supply support for MAX6437UT+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 battery state monitoring in space- and energy-constrained portable electronics - prioritizing sub-µA operation, wide input voltage range, and robust noise immunity without external components.

FAQ

What is the function of the HTHIN and LTHIN pins on the MAX6437UT+T?

The HTHIN and LTHIN pins on the MAX6437UT+T serve as high-impedance comparator inputs for setting the upper and lower battery threshold voltages. HTHIN connects to a resistor divider to define the LBOH trip point (e.g., "battery weak"), while LTHIN defines the LBOL trip point (e.g., "battery empty"). Both reference internal 585mV/615mV references, enabling precise, user-adjustable hysteresis without trimming components. This architecture is integral to the MAX6437UT+T's ability to deliver staged battery warnings.

Can the MAX6437UT+T operate with a 1.0V battery supply?

Yes, the MAX6437UT+T guarantees valid logic states on its LBOH and LBOL outputs down to BATT = 1.0V - a key specification confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables. While VDD must be ≥1.6V for full functionality, the device maintains correct open-drain output behavior during deep discharge, ensuring fail-safe shutdown signaling in primary-cell applications. This capability is explicitly documented for the MAX6437UT+T in its datasheet.

How does the 140ms timeout period improve system reliability in the MAX6437UT+T?

The 140ms minimum timeout period in the MAX6437UT+T prevents false triggering during transient voltage sags caused by pulsed loads (e.g., GSM burst transmission or motor startup). It forces the LBOH and LBOL outputs to remain asserted for at least 140ms after crossing the release threshold - ensuring the battery voltage has stabilized before enabling power converters or waking microprocessors. This timing behavior is built into the MAX6437UT+T's internal logic and is specified across -40°C to +85°C.

What package type and dimensions does the MAX6437UT+T use?

The MAX6437UT+T uses a lead-free 6-pin SOT23-6 package measuring 2.9mm × 1.6mm × 1.1mm, with standard SOT23 footprint and pin spacing (0.95mm pitch). This compact outline is confirmed in the "Package Information" section of the MAX6437UT+T datasheet and matches the mechanical drawings for SOT23-6 (package code UT). The +T suffix explicitly denotes RoHS-compliant, lead-free termination.

Does the MAX6437UT+T require external components to function?

No, the MAX6437UT+T requires no external components for basic operation - it integrates a precision 585mV/615mV reference, dual comparators, timing circuitry, and logic in a single die. However, external resistor dividers are required on HTHIN and LTHIN to set user-defined thresholds. Unlike factory-trimmed variants (e.g., MAX6430), the MAX6437UT+T relies on these passive networks for configuration - but no capacitors, regulators, or additional ICs are needed.