Analog Devices Inc./Maxim Integrated MAX6430PQUS-T

Overview

MAX6430PQUS-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 -40°C to +85°C industrial temperature range - used in portable medical devices and cordless phones to enable low-power mode and system shutdown.

For engineers reviewing the MAX6430PQUS-T datasheet, MAX6430PQUS-T pinout, MAX6430PQUS-T application, or MAX6430PQUS-T equivalent, key selection criteria include dual-threshold hysteresis behavior, SOT143-4 package compatibility, guaranteed LBO logic state down to 1.0V BATT, immunity to short voltage transients, and factory-set thresholds without external components.

Technical Context

The MAX6430PQUS-T implements two independent comparators with internal reference and timing logic to generate two distinct low-battery signals: LBOH asserts when battery voltage falls below factory-trimmed VHTH− (e.g., 2.9V), and LBOL asserts at VLTH− (e.g., 2.4V); both deassert only after rising above VHTH+ (≈105% × VHTH−) or VLTH+ (≈105% × VLTH−) with ≥140ms stabilization delay.

It uses BiCMOS process technology (905 transistors), draws ≤1.5µA supply current across temperature, and maintains valid output states even when BATT drops to 1.0V - enabling reliable brown-out detection in deeply discharged battery scenarios common in handheld electronics.

Key Specifications

Pinout & Package

MAX6430PQUS-T is housed in a 4-pin SOT143-4 package (3.0mm × 1.7mm × 1.3mm), lead-free, tape-and-reel compatible, with exposed pad option not present. Pin 1 = BATT, Pin 2 = LBOH, Pin 3 = GND, Pin 4 = LBOL - all pins are surface-mount, no thermal pad.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-threshold battery monitoring applications.

Compared with MAX6430PQUS-T, MAX6431PQUS-T offers mixed output drive types but less flexibility in logic interfacing, while TLV809E33DBZR lacks dual thresholds and low-voltage operation - making MAX6430PQUS-T uniquely suited for multi-level battery state management in portable Li+/alkaline systems.

Availability

MAX6430PQUS-T is available at Aetrix Electronics and suitable for portable medical devices, cordless phones, and electronic toys requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.

Supply support for MAX6430PQUS-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 designed specifically for ultra-low-power, multi-level battery state monitoring in space- and current-constrained portable electronics - emphasizing factory-trimmed accuracy, zero-external-component operation, and robust transient immunity.

FAQ

What is the function of the two outputs on the MAX6430PQUS-T?

The MAX6430PQUS-T provides two independent open-drain outputs: LBOH (pin 2) asserts when battery voltage falls below the upper factory-trimmed threshold (e.g., 2.9V), signaling "weak battery" for power-saving actions; LBOL (pin 4) asserts at the lower threshold (e.g., 2.4V), indicating "empty battery" to initiate safe shutdown. Both outputs remain asserted for ≥140ms after voltage recovery to prevent chatter.

Does the MAX6430PQUS-T require external resistors to set thresholds?

No. The MAX6430PQUS-T uses factory-trimmed internal thresholds - no external resistors, dividers, or calibration components are needed. This distinguishes it from the user-adjustable MAX6436–MAX6438 variants and simplifies PCB layout, reduces BOM count, and improves production yield.

Can the MAX6430PQUS-T operate with a 1.0V battery supply?

Yes. The MAX6430PQUS-T guarantees valid logic states on LBOH and LBOL outputs down to BATT = 1.0V, enabling reliable end-of-discharge detection for alkaline and NiMH cells - a capability not supported by most competing battery monitors that fail below 1.6V.

What package type is used for the MAX6430PQUS-T?

The MAX6430PQUS-T is supplied in a 4-pin SOT143-4 package (3.0mm × 1.7mm footprint, 1.3mm height), RoHS-compliant and tape-and-reel packaged. Pinout is BATT (1), LBOH (2), GND (3), LBOL (4) - identical across all MAX6430x variants in this package.

How does the 140ms timeout period improve system reliability?

The 140ms hardware-enforced timeout on the MAX6430PQUS-T ensures outputs remain asserted until battery voltage stabilizes after transient sags - such as those caused by motor startup or RF transmission. This eliminates false triggers and removes the need for software debounce, reducing firmware complexity and improving real-time response consistency.