Analog Devices Inc./Maxim Integrated MAX6436UT+T

Overview

The MAX6436UT+T from Maxim Integrated is a dual-output, user-adjustable battery monitor IC for low-power systems, featuring two independent low-battery outputs (LBOH and LBOL), 140ms minimum timeout period, 1µA typical supply current, and operation down to 1.0V BATT. It uses an internal 615mV reference with external resistor-divider programming of high/low thresholds and is designed for single-cell Li+ or multi-cell alkaline/NiMH/NiCd battery supervision in portable medical devices and MP3 players.

For engineers reviewing the MAX6436UT+T datasheet, MAX6436UT+T pinout, MAX6436UT+T application, or MAX6436UT+T equivalent, key selection criteria include dual-threshold hysteresis configuration, SOT23-6 package compatibility, push-pull/open-drain output logic options, guaranteed LBO validity at 1.0V, and immunity to short battery transients.

Technical Context

The MAX6436UT+T implements two independent comparators-one monitoring HTHIN for high-threshold detection (LBOH) and one monitoring LTHIN for low-threshold detection (LBOL)-each referenced to internal 585mV/615mV references. Its timing circuit enforces a 140ms minimum deassertion delay after threshold crossing to prevent false triggering during battery recovery.

Thresholds are set via external resistor dividers on HTHIN and LTHIN pins, enabling programmable hysteresis (~5% between VHTHIN−/VHTHIN+ and VLTHIN−/VLTHIN+). The device operates with either BATT or VDD supply (1.6V–5.5V), supports push-pull or open-drain output configurations, and maintains valid logic states down to BATT = 1.0V.

Key Specifications

Pinout & Package

MAX6436UT+T is housed in a lead-free 6-pin SOT23-6 package (3.0mm × 1.7mm × 1.3mm), optimized for space-constrained portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6437UT+T, MAX6436UT+T provides native active-low LBOL for direct MCU reset assertion; compared with TLV7032IDR, it eliminates external timing components and guarantees 140ms hysteresis behavior without firmware dependency.

Availability

MAX6436UT+T is available at Aetrix Electronics and suitable for portable medical devices, MP3 players, and electronic toys requiring stable component supply, long-term lifecycle support, and RoHS-compliant lead-free packaging.

Supply support for MAX6436UT+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, medical, and consumer applications.

The MAX6427–MAX6438 family was engineered to deliver ultra-low-power, configurable battery monitoring for space- and energy-constrained portable electronics - eliminating external components while guaranteeing robust operation across battery chemistries and temperature ranges.

FAQ

What is the function of the HTHIN and LTHIN pins on the MAX6436UT+T?

The HTHIN and LTHIN pins on the MAX6436UT+T serve as high-impedance comparator inputs for externally setting the upper (VHTHIN−/VHTHIN+) and lower (VLTHIN−/VLTHIN+) battery thresholds using resistor-divider networks. These pins interface directly with the internal 585mV and 615mV references, enabling precise, user-adjustable hysteresis without trimming resistors or calibration. Each pin draws ≤20nA, supporting high-resistance dividers for minimal battery drain.

Does the MAX6436UT+T require external capacitors or timing components?

No, the MAX6436UT+T does not require external capacitors or timing components. Its 140ms minimum timeout period is implemented entirely within the IC using internal circuitry, and its dual comparators rely solely on the external resistor dividers connected to HTHIN and LTHIN. This eliminates BOM count, PCB area, and tolerance-related design uncertainty - a key advantage over discrete comparator solutions like the TLV7032IDR.

Can the MAX6436UT+T monitor a single Li+ cell down to termination voltage?

Yes, the MAX6436UT+T can monitor a single Li+ cell down to 1.0V while maintaining valid LBOH/LBOL logic states - well below the typical 2.5V–3.0V termination voltage of most Li+ cells. Its operating range extends from 1.0V to 5.5V on BATT, and its internal comparators remain functional and accurate across this range, making it suitable for detecting end-of-discharge conditions in primary and rechargeable chemistries.

How does the MAX6436UT+T prevent false triggering during battery load transients?

The MAX6436UT+T prevents false triggering through two mechanisms: (1) a guaranteed 140ms minimum timeout period after threshold crossing, which forces sustained voltage stability before output deassertion, and (2) programmable hysteresis (~5%) between VHTHIN−/VHTHIN+ and VLTHIN−/VLTHIN+, which widens the decision window to reject noise and transient dips. Together, these features ensure reliable operation during motor startup, audio bursts, or RF transmission events.

What output logic configurations are supported by the MAX6436UT+T?

The MAX6436UT+T supports both push-pull and open-drain output configurations for LBOH and LBOL. Push-pull outputs drive actively high/low relative to VDD, while open-drain variants allow pull-up to any voltage up to 5.5V - enabling interface with higher-voltage MCUs or mixed-rail systems. The specific configuration is fixed per part number; MAX6436UT+T implements active-low push-pull outputs, confirmed by its datasheet pin description and functional diagram.