Analog Devices Inc./Maxim Integrated MAX6432DHUS

Overview

MAX6432DHUS 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 MAX6432DHUS datasheet, MAX6432DHUS pinout, MAX6432DHUS application, or MAX6432DHUS equivalent, this device delivers precise dual-threshold monitoring without external components - critical for low-power system wake-up control, DC-DC converter enable/disable sequencing, and battery state-aware firmware transitions.

Technical Context

The MAX6432DHUS implements two 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. Its logic is referenced to BATT, not VDD, enabling direct battery-supplied operation.

It features guaranteed valid output states down to BATT = 1.0V, immunity to short voltage transients (<100µs), and push-pull/open-drain output options - here configured as open-drain LBOH/LBOL with 0.4V VOL at 3.2mA sink, supporting level-shifted interfacing to higher-voltage microcontrollers.

Key Specifications

Pinout & Package

MAX6432DHUS is housed in a 4-pin SOT143-4 package (2.9mm × 1.6mm × 1.1mm), lead-free, RoHS-compliant, and tape-and-reel packaged.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6432DHUS, MAX6431DHUS offers mixed output types but lacks identical dual open-drain flexibility, while TLV809E33DBZR omits hysteresis timing and dual thresholds entirely - making MAX6432DHUS uniquely suited for battery-state-aware power management requiring both warning and shutdown signals.

Availability

MAX6432DHUS is available at Aetrix Electronics and suitable for portable medical devices, pagers, legacy cell phones, and electronic toys requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for MAX6432DHUS 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, with deep expertise in ultra-low-power monitoring solutions.

The MAX6427–MAX6438 family was engineered specifically for battery-powered systems needing accurate, low-quiescent-current voltage supervision - targeting portable instrumentation, wearables, and energy-constrained edge devices.

FAQ

What is the function of the two outputs on the MAX6432DHUS?

The MAX6432DHUS provides two independent active-low open-drain outputs: LBOH signals "battery weak" (e.g., BATT < 2.8V), and LBOL signals "battery empty" (e.g., BATT < 2.3V). Each has a 140ms minimum timeout to prevent chatter during voltage recovery. Both outputs remain valid down to BATT = 1.0V, ensuring reliable shutdown sequencing in the MAX6432DHUS.

Does the MAX6432DHUS require external resistors to set thresholds?

No. The MAX6432DHUS uses factory-trimmed internal thresholds - no external resistors or voltage dividers are needed. Its VHTH−, VHTH+, VLTH−, and VLTH+ trip points are laser-trimmed during production and specified in the ordering guide (e.g., DH = 2.8V/2.3V). This eliminates calibration effort and board space, distinguishing the MAX6432DHUS from user-adjustable variants like MAX6436UT-T.

What package type and pin count does the MAX6432DHUS use?

The MAX6432DHUS is supplied in a 4-pin SOT143-4 package (2.9mm × 1.6mm footprint), with pins assigned as BATT (1), LBOH (2), GND (3), and LBOL (4). This compact, surface-mount package supports high-density layouts and automated assembly - a key mechanical identity of the MAX6432DHUS confirmed in Maxim's official package drawings and ordering information.

Can the MAX6432DHUS operate from a single 1.5V alkaline cell?

Yes. The MAX6432DHUS operates over 1.0V to 5.5V and guarantees valid LBO logic states down to BATT = 1.0V. While its factory-trimmed thresholds (e.g., 2.3V/2.8V) are optimized for 2–3-cell alkaline or single Li+, it remains functional - though not optimally indicative - at 1.5V. For true single-cell alkaline monitoring, MAX6433UK-T with user-adjustable thresholds is recommended instead of MAX6432DHUS.

How does the 140ms timeout in the MAX6432DHUS improve system reliability?

The 140ms minimum timeout ensures the MAX6432DHUS holds LBOH or LBOL asserted until the battery voltage stabilizes above the respective high threshold (VHTH+ or VLTH+), preventing premature deassertion during transient recovery after load removal. This eliminates false wake-ups or erratic behavior in microcontrollers and DC-DC converters - a core timing reliability feature built into the MAX6432DHUS architecture.