Analog Devices Inc./Maxim Integrated MAX6427DHUR+

Overview

MAX6427DHUR+ from Maxim Integrated is a single-output, factory-trimmed, low-power battery monitor IC for Li+ and multi-cell alkaline/NiMH/NiCd systems. It features a fixed low-battery threshold (2.0V), 140ms minimum timeout period, push-pull LBO output, and operates from 1.0V to 5.5V supply with only 1µA typical quiescent current. It is used in portable medical devices and MP3 players to trigger system shutdown when battery voltage falls below safe operating level.

For engineers reviewing the MAX6427DHUR+ datasheet, MAX6427DHUR+ pinout, MAX6427DHUR+ application, or MAX6427DHUR+ equivalent, this page delivers verified electrical parameters, SOT23-3 package details, hysteresis behavior, low-battery timing characteristics, and real-world selection guidance for battery-powered embedded designs.

Technical Context

The MAX6427DHUR+ implements a precision comparator-based monitoring architecture with internal 615mV reference and hysteresis logic. It asserts its active-low push-pull LBO output when BATT drops below VLTH = 2.0V (±2.5%), and deasserts only after BATT rises above VHTH = 2.1V (±2.5%) and remains stable for ≥140ms - preventing false triggers during transient load recovery.

This device draws just 1µA at 3.7V and guarantees valid LBO logic state down to BATT = 1.0V. Its SOT23-3 footprint integrates power supply, ground, and LBO functions without external components, making it suitable for space-constrained, ultra-low-power applications requiring deterministic battery-state signaling.

Key Specifications

Pinout & Package

MAX6427DHUR+ is housed in a lead-free, RoHS-compliant 3-pin SOT23-3 package (JEDEC MO-178AA). The package has a 0.95mm maximum height and 0.95mm pitch, optimized for compact portable electronics.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6428DHUR+, MAX6427DHUR+ triggers 100mV earlier, better matching alkaline discharge curves; versus TLV7031DBVR, it delivers plug-and-play reliability with zero external parts and guaranteed 140ms timeout - critical for certified medical and industrial products.

Availability

MAX6427DHUR+ is available at Aetrix Electronics and suitable for portable medical devices, MP3 players, and pagers requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for MAX6427DHUR+ 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 battery-state monitoring in space-constrained portable electronics, emphasizing factory-trimmed accuracy, sub-µA operation, and robust hysteresis timing.

FAQ

What is the exact low-battery threshold voltage for MAX6427DHUR+?

The MAX6427DHUR+ has a factory-trimmed low-battery threshold (VLTH) of 2.0V ±2.5%, specified over -40°C to +85°C. This value is laser-trimmed during production and does not require external calibration. The corresponding high-threshold (VHTH) is 2.1V ±2.5%, establishing a 100mV hysteresis band to prevent output oscillation during battery recovery. These values are documented in Maxim's MAX6427–MAX6438 datasheet Rev 2, Table 2.

Does MAX6427DHUR+ require external resistors or capacitors to operate?

No, MAX6427DHUR+ requires no external components. It integrates a precision 615mV reference, comparator, hysteresis logic, and 140ms timeout timer in a single SOT23-3 package. Unlike adjustable-threshold variants (e.g., MAX6433), the MAX6427DHUR+ uses factory-trimmed thresholds and operates immediately upon connection to BATT, GND, and load - simplifying design and reducing BOM cost.

What is the function and drive capability of the LBO pin on MAX6427DHUR+?

The LBO pin on MAX6427DHUR+ is an active-low push-pull output referenced to BATT. It sinks up to 3.2mA at 4.5V (VOL ≤ 0.4V) and sources up to 800µA (VOH ≥ 0.8×BATT). This allows direct interfacing with MCU reset/NMI inputs without pull-up resistors. The output remains asserted for ≥140ms after BATT exceeds 2.1V, ensuring stable system reactivation.

Can MAX6427DHUR+ operate down to 1.0V battery voltage?

Yes, MAX6427DHUR+ guarantees valid LBO logic state operation down to BATT = 1.0V, as confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables. At 1.0V, the device continues to monitor and assert LBO correctly - a key feature for maximizing usable capacity in alkaline and NiMH cells, and essential for fail-safe shutdown in portable medical equipment.

Is MAX6427DHUR+ pin-compatible with other devices in the MAX6427–MAX6438 family?

MAX6427DHUR+ shares the SOT23-3 package and pinout (BATT–LBO–GND) with MAX6428DHUR+ and MAX6429DHUR+, but not with dual-output or adjustable-threshold variants (e.g., MAX6430/MAX6433), which use 4-, 5-, or 6-pin packages. Within the SOT23-3 group, all share identical footprint and connectivity - enabling drop-in replacement for different threshold options without PCB revision.