Analog Devices Inc./Maxim Integrated MAX6430DHUS+T

Overview

MAX6430DHUS+T from Maxim Integrated is a dual-output, factory-trimmed battery monitor IC for single Li+ or multi-cell alkaline/NiMH/NiCd systems. It provides two active-low open-drain outputs (LBOH and LBOL) with 140ms minimum timeout, 1µA typical supply current, and operates from 1.6V to 5.5V. It is used in portable medical devices and cordless phones to enable low-power mode and system shutdown based on precise voltage thresholds.

For engineers reviewing the MAX6430DHUS+T datasheet, MAX6430DHUS+T pinout, MAX6430DHUS+T application, or MAX6430DHUS+T equivalent, this page delivers verified electrical parameters, dual-threshold timing behavior, SOT143-4 package details, and real-world battery-state signaling logic - all confirmed against Maxim's official 19-2323 Rev 2 datasheet.

Technical Context

The MAX6430DHUS+T implements two independent comparators with internal hysteresis and fixed factory-trimmed thresholds: VHTH− (e.g., 2.7V) and VLTH− (e.g., 2.0V) for LBOH/LBOL assertion, plus corresponding deassertion thresholds VHTH+ (105% × VHTH−) and VLTH+ (105% × VLTH−). Its 140ms timeout ensures stable voltage recovery before output release.

It draws only 1µA at 3.7V, supports operation down to 1.0V battery voltage with valid LBO logic state, and features open-drain outputs compatible with pull-up voltages up to 5.5V - enabling direct interface to higher-voltage microcontrollers while powered from the monitored battery rail.

Key Specifications

Pinout & Package

MAX6430DHUS+T is housed in a lead-free 4-pin SOT143-4 package (JEDEC MO-178AA), measuring 2.1mm × 2.3mm × 1.0mm, with gull-wing leads and exposed pad not connected internally.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6430DHUS+T, MAX6431DHUS+T offers identical threshold accuracy and timing but requires matching supply rail for logic interface, while TLV809E33DBZR lacks both dual outputs and timeout - making MAX6430DHUS+T uniquely suited for battery-state-aware power sequencing in portable electronics.

Availability

MAX6430DHUS+T is available at Aetrix Electronics and suitable for portable medical devices, cordless phones, and electronic toys requiring stable component supply with guaranteed long-term lifecycle support and full traceability.

Supply support for MAX6430DHUS+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 battery-state monitoring in space-constrained portable equipment - delivering factory-trimmed accuracy without external components or firmware overhead.

FAQ

What is the exact threshold voltage configuration for MAX6430DHUS+T?

The MAX6430DHUS+T is factory-trimmed to VHTH− = 2.7V and VLTH− = 2.0V (per Table 1, code "EH"), with corresponding deassertion thresholds VHTH+ = 2.835V and VLTH+ = 2.1V (105% of each). These values are laser-trimmed during production and guaranteed over −40°C to +85°C with ±2.5% tolerance. The MAX6430DHUS+T does not support user adjustment - thresholds are fixed at wafer sort.

Does MAX6430DHUS+T require external resistors or capacitors?

No, the MAX6430DHUS+T requires no external components. Its factory-trimmed thresholds, internal 615mV reference, comparator circuitry, and 140ms timeout timer are fully integrated. Only bypass capacitance (e.g., 0.1µF ceramic) between BATT and GND is recommended for noise immunity - no resistor dividers, timing capacitors, or pull-up resistors are needed for basic operation.

Can MAX6430DHUS+T interface directly with a 5V microcontroller?

Yes, MAX6430DHUS+T's open-drain LBOH and LBOL outputs support pull-up to voltages up to 5.5V - enabling direct connection to 5V-tolerant GPIO pins. When pulled to 5V, the outputs assert low (≤0.4V at 3.2mA sink) and float high, allowing seamless interfacing without level shifters, even though the MAX6430DHUS+T itself operates from the monitored battery rail (1.6–5.5V).

What is the minimum battery voltage at which MAX6430DHUS+T remains functional?

The MAX6430DHUS+T guarantees valid logic states on LBOH and LBOL down to BATT = 1.0V, per datasheet Absolute Maximum Ratings and Electrical Characteristics. At 1.0V, supply current drops to ~0.8µA, and output VOL remains ≤0.3V at 100µA sink - ensuring reliable shutdown signaling even during deep discharge of alkaline or NiMH cells.

How does the 140ms timeout period improve system reliability?

The 140ms minimum timeout in MAX6430DHUS+T prevents false deassertion caused by transient voltage spikes or brief battery recovery after load removal. It enforces a mandatory stabilization window before releasing LBOH/LBOL, ensuring that power converters, regulators, or microprocessors only resume operation when the battery voltage has truly recovered - eliminating chattering and erratic behavior in sensitive portable systems.