Analog Devices Inc./Maxim Integrated MAX6430EIUS+T

Overview

The MAX6430EIUS+T from Maxim Integrated is a dual-level, factory-trimmed battery monitor IC with two active-low open-drain low-battery outputs (LBOH and LBOL), 140ms minimum timeout, ±2.5% threshold accuracy over temperature, and operates from 1.6V to 5.5V supply. It monitors single Li+ or multi-cell alkaline/NiMH/NiCd batteries to signal "weak" (via LBOH) and "empty" (via LBOL) states for system power management in portable medical devices and cordless phones.

For engineers reviewing the MAX6430EIUS+T datasheet, MAX6430EIUS+T pinout, MAX6430EIUS+T application, or MAX6430EIUS+T equivalent, this device delivers precise dual-threshold detection without external components, supports lead-free SOT143-4 packaging, and enables robust battery-state signaling in ultra-low-power systems where supply stability and noise immunity are critical.

Technical Context

The MAX6430EIUS+T implements two independent comparators with internal hysteresis and fixed factory-trimmed thresholds: VHTH− (upper trip on falling voltage) and VLTH− (lower trip on falling voltage), plus corresponding deassertion thresholds VHTH+ and VLTH+. Its logic ensures LBOH/LBOL remain asserted for ≥140ms after voltage recovery, preventing false resets during battery rebound.

It draws only 1µA typical supply current, guarantees valid output logic down to BATT = 1.0V, 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

MAX6430EIUS+T is housed in a lead-free 4-pin SOT143-4 package (3.0mm × 1.7mm × 1.3mm), optimized for space-constrained portable designs. Pin 1 = BATT, Pin 2 = LBOH, Pin 3 = GND, Pin 4 = LBOL.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6431EIUS+T, MAX6430EIUS+T provides uniform open-drain outputs for maximum interface flexibility, while TLV7032IDGKR demands significant design effort to replicate basic battery-monitor functionality - making MAX6430EIUS+T the optimal choice for rapid, cost-sensitive, and high-reliability portable deployments.

Availability

MAX6430EIUS+T is available at Aetrix Electronics and suitable for portable medical devices, cordless telephones, pagers, and electronic toys requiring stable component supply, lead-free compliance, and guaranteed long-term availability.

Supply support for MAX6430EIUS+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 high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and consumer applications.

The MAX6427–MAX6438 family was designed specifically for ultra-low-power battery-state monitoring in space- and cost-constrained portable electronics, eliminating external components while delivering precision, noise immunity, and guaranteed timing behavior.

FAQ

What is the function of the LBOH and LBOL outputs on the MAX6430EIUS+T?

The MAX6430EIUS+T uses LBOH (Low-Battery Output High) to signal a "weak battery" condition when the supply voltage drops below its factory-trimmed VHTH− threshold, and LBOL (Low-Battery Output Low) to signal an "empty battery" condition when voltage falls below its VLTH− threshold. Both are active-low open-drain outputs, allowing independent pull-up to voltages up to 5.5V - enabling clean integration with diverse microcontroller I/O standards without level shifters.

Does the MAX6430EIUS+T require external resistors or capacitors to operate?

No, the MAX6430EIUS+T requires no external components. As a factory-trimmed dual-threshold monitor in the MAX6427–MAX6438 family, it integrates precision references, comparators, hysteresis, and 140ms timeout logic internally. This eliminates resistor dividers, timing capacitors, and calibration steps - reducing BOM count, PCB area, and qualification effort compared to discrete or adjustable alternatives like the MAX6436UT-T.

What is the minimum supply voltage at which the MAX6430EIUS+T guarantees valid output logic?

The MAX6430EIUS+T guarantees valid LBOH and LBOL logic states down to BATT = 1.0V, per the Absolute Maximum Ratings and Electrical Characteristics tables. This ensures reliable final-stage shutdown signaling even during deep discharge of alkaline or NiMH cells, supporting fail-safe power-down sequences in safety-critical portable equipment.

How does the 140ms timeout period improve system reliability in the MAX6430EIUS+T?

The 140ms minimum timeout period in the MAX6430EIUS+T ensures that LBOH and LBOL remain asserted for at least that duration after the supply voltage rises above their respective deassertion thresholds (VHTH+ and VLTH+). This prevents chattering caused by transient voltage rebounds during load removal or battery recovery - guaranteeing stable microcontroller wake-up or power-enable events in real-world portable use cases.

Is the MAX6430EIUS+T compatible with both lithium-ion and alkaline battery chemistries?

Yes, the MAX6430EIUS+T is explicitly qualified for monitoring single-cell Li+ (3.0–4.2V), two-cell alkaline/NiMH (2.4–3.2V), and three-cell alkaline/NiMH (3.6–4.8V) power supplies. Its factory-trimmed thresholds (e.g., EI variant: VHTH− = 3.0V, VLTH− = 2.6V) match common battery discharge profiles, and its 1.6V–5.5V operating range accommodates full voltage spans without derating.