Analog Devices Inc./Maxim Integrated MAX6430MRUS+T

Overview

The MAX6430MRUS+T from Maxim Integrated is a dual-output, factory-trimmed battery monitor IC for single Li+ or multi-cell alkaline/NiMH/NiCd power supplies, featuring two independent low-battery outputs (LBOH and LBOL), 140ms minimum timeout period, ±2.5% threshold accuracy over -40°C to +85°C, and 1µA typical supply current - used to enable low-power mode and system shutdown in portable medical devices and cordless phones.

For engineers reviewing the MAX6430MRUS+T datasheet, MAX6430MRUS+T pinout, MAX6430MRUS+T application, or MAX6430MRUS+T equivalent, key selection criteria include dual-threshold hysteresis behavior, SOT143-4 package compatibility, guaranteed LBO logic state down to 1.0V BATT, and immunity to short battery voltage transients.

Technical Context

The MAX6430MRUS+T implements two independent comparators with internal hysteresis and fixed factory-trimmed thresholds: VHTH−/VHTH+ for LBOH assertion/deassertion and VLTH−/VLTH+ for LBOL assertion/deassertion. It operates directly from the monitored battery (BATT) without external reference or divider components.

Each output includes a 140ms minimum timeout circuit to prevent chatter during battery recovery, and both LBOH and LBOL are open-drain, active-low outputs compatible with pull-up voltages up to 5.5V - enabling interface with higher-voltage microcontrollers while monitoring low-voltage battery rails.

Key Specifications

Pinout & Package

MAX6430MRUS+T is housed in a lead-free, RoHS-compliant 4-pin SOT143-4 package (1.3mm × 2.1mm, 0.95mm height), 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-output battery monitor applications.

Compared with MAX6430MRUS+T, MAX6431MRUS+T offers push-pull drive for lower EMI in noise-sensitive systems, while TLV809E26DBZR sacrifices dual-level intelligence for ultra-low cost and smaller footprint - making MAX6430MRUS+T the optimal balance of precision staging, interface flexibility, and integration.

Availability

MAX6430MRUS+T is available at Aetrix Electronics and suitable for portable medical devices, cordless phones, electronic toys, and PDAs requiring stable component supply with long-term lifecycle support and consistent parametric performance.

Supply support for MAX6430MRUS+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 management, sensing, and interface applications in industrial, medical, and consumer markets.

The MAX6427–MAX6438 family was engineered specifically for ultra-low-power, dual-threshold battery state monitoring in space- and energy-constrained portable electronics - eliminating external components while guaranteeing operation down to 1.0V.

FAQ

What is the function of the two outputs (LBOH and LBOL) on the MAX6430MRUS+T?

The MAX6430MRUS+T uses LBOH to indicate a "weak battery" condition (e.g., triggering low-power mode), and LBOL to signal "battery empty" (e.g., initiating system shutdown). LBOH asserts when BATT falls below its factory-trimmed VHTH− threshold and deasserts only after BATT rises above VHTH+, with ≥140ms timeout. LBOL behaves similarly but with separate VLTH−/VLTH+ thresholds - enabling precise, staged battery management without firmware intervention. This dual-output architecture is intrinsic to the MAX6430MRUS+T design.

Does the MAX6430MRUS+T require external resistors to set its thresholds?

No, the MAX6430MRUS+T does not require external resistors. It belongs to the factory-trimmed subgroup (MAX6430/MAX6431/MAX6432) within the MAX6427–MAX6438 family, meaning both VHTH−/VHTH+ and VLTH−/VLTH+ thresholds are laser-trimmed during production. This eliminates external components, reduces PCB area, and improves production yield - a core design advantage of the MAX6430MRUS+T over user-adjustable variants like MAX6436.

What is the minimum battery voltage at which the MAX6430MRUS+T remains functional?

The MAX6430MRUS+T guarantees valid LBO logic states down to BATT = 1.0V, as specified in the Electrical Characteristics table. Its operating voltage range extends from 1.0V to 5.5V, and it maintains accurate threshold detection and timeout timing even at this minimum rail - enabling reliable end-of-discharge detection in primary alkaline and NiMH cells. This 1.0V operational floor is a defined specification of the MAX6430MRUS+T.

Can the MAX6430MRUS+T outputs interface directly with a 3.3V microcontroller?

Yes, the MAX6430MRUS+T's LBOH and LBOL outputs are open-drain and rated for pull-up voltages up to 5.5V. When pulled to 3.3V, they assert low (≤0.4V at 3.2mA sink) and deassert high-impedance - allowing direct, level-shift-free connection to 3.3V GPIO pins. This interface flexibility is built into the MAX6430MRUS+T's output architecture and requires no additional circuitry.

How does the 140ms timeout period improve system reliability in the MAX6430MRUS+T?

The 140ms minimum timeout period in the MAX6430MRUS+T prevents output chatter during battery voltage recovery after load removal or transient dips. It ensures the LBOH and LBOL signals remain asserted until BATT stabilizes above the respective high thresholds for ≥140ms - avoiding premature re-enabling of power converters or processors. This timing behavior is hard-coded in the MAX6430MRUS+T's internal logic and is validated across -40°C to +85°C.