Analog Devices Inc./Maxim Integrated MAX6442KAEISD3-T

Overview

The MAX6442KAEISD3-T from Maxim Integrated is a dual-output, ultra-low-power battery monitor with integrated microprocessor supervisor and push-pull RESET output. It monitors single-cell Li+ or multicell alkaline/NiMH batteries using factory-trimmed hysteresis thresholds (LTH- = 1.950 V, HTH+ = 2.050 V), delivers 2.5 µA typical supply current at 3.6 V, and provides 150 ms minimum LBO timeout and VCC reset timeout. It is used in portable medical devices to manage power sequencing during battery depletion.

For engineers reviewing the MAX6442KAEISD3-T datasheet, MAX6442KAEISD3-T pinout, MAX6442KAEISD3-T application, or MAX6442KAEISD3-T equivalent, key selection criteria include its dual open-drain low-battery outputs (LBOL/LBOH), push-pull active-low RESET, factory-set 2.00 V VCC reset threshold, and SOT23-8 package compatibility with space-constrained handheld systems.

Technical Context

The MAX6442KAEISD3-T implements two independent voltage comparators with hysteresis for battery monitoring: LBOL triggers at LTH− (1.950 V) and releases at LTH+ (2.000 V); LBOH triggers at HTH− (1.950 V) and releases at HTH+ (2.050 V). Its internal 1.23 V reference enables precise threshold detection across −40°C to +85°C.

It integrates a dedicated µP supervisor with push-pull RESET output referenced to VCC, a manual reset (MR) input with 1.5 kΩ internal pullup and 150 ms debounce, and operates from either VBATT or VCC-whichever is higher-eliminating external power management circuitry.

Key Specifications

Pinout & Package

The MAX6442KAEISD3-T is housed in an 8-pin SOT23 package (JEDEC MO-178 compliant) with 0.65 mm pitch, 1.30 mm max height, and coplanarity ≤ 0.1 mm. Pin 1 is marked with a dot; leads are lead-free (RoHS-compliant).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6442KAEISD3-T, MAX6441KAEISD3-T requires external biasing for RESET but shares identical battery monitoring behavior, while TPS3808G12DBVR lacks battery sensing entirely-making it unsuitable as a functional replacement without redesigning the power-management architecture.

Availability

The MAX6442KAEISD3-T is available at Aetrix Electronics and suitable for portable medical devices, Li+-powered PDAs, wireless electronic toys, and compact MP3 players requiring stable component supply and long-term lifecycle support.

Supply support for MAX6442KAEISD3-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, mixed-signal, and power management ICs for demanding industrial, medical, and consumer applications.

The MAX6442KAEISD3-T belongs to the MAX6439–MAX6442 family of ultra-low-power battery monitors with integrated µP supervisors-engineered specifically for space- and energy-constrained portable electronics requiring deterministic power-state management.

FAQ

What is the exact LTH− and HTH+ threshold voltage for MAX6442KAEISD3-T?

The MAX6442KAEISD3-T has factory-trimmed LTH− = 1.950 V and HTH+ = 2.050 V, as specified in Table 2 of the datasheet for two-cell alkaline/NiMH applications with suffix 'K' and 'E'. These values are guaranteed over −40°C to +85°C and enable precise dual-level battery state detection without external components. The MAX6442KAEISD3-T uses these thresholds to assert LBOL at 1.950 V and deassert LBOH at 2.050 V after 150 ms.

Does MAX6442KAEISD3-T support both VBATT and VCC as power sources?

Yes, the MAX6442KAEISD3-T automatically selects the higher of VBATT or VCC as its internal power supply-enabling operation even if one rail collapses. This dual-supply architecture ensures continuous battery monitoring during VCC brownouts and reliable RESET assertion when VCC falls below 2.000 V. The MAX6442KAEISD3-T draws current from whichever supply is greater, eliminating the need for external OR-ing diodes or power-path controllers.

What is the function of the LBOLH pin on MAX6442KAEISD3-T?

The LBOLH pin on MAX6442KAEISD3-T is an open-drain, active-low output that asserts when VBATT drops below LTH− (1.950 V) and deasserts only after VBATT rises above HTH+ (2.050 V) for ≥150 ms. It combines the trip points of LBOL and LBOH into a single signal-ideal for systems needing a "battery critically low" flag that ignores brief recoveries. Unlike LBOL or LBOH alone, LBOLH provides extended hysteresis to prevent chattering during marginal battery conditions.

Can MAX6442KAEISD3-T drive a 10 kΩ pullup resistor on its RESET output?

Yes-the MAX6442KAEISD3-T features a push-pull RESET output capable of sourcing ≥100 µA at 0.8 × VCC and sinking ≥1.2 mA at 0.3 V, fully compatible with standard 10 kΩ pullup configurations. This eliminates reliance on external components and ensures robust noise immunity in noisy environments. The MAX6442KAEISD3-T's push-pull design guarantees fast, rail-to-rail RESET transitions without rise-time degradation caused by RC time constants.

How does the MR input debounce work on MAX6442KAEISD3-T?

The MR input on MAX6442KAEISD3-T includes hardware debounce with a fixed 150 ms rising-edge timeout (tDEB), ignoring any subsequent low pulses within that window after a valid assertion. This prevents false resets from mechanical switch bounce or EMI. The internal 1.5 kΩ pullup to VCC simplifies interface design-only a momentary switch to GND is required. The MAX6442KAEISD3-T guarantees MR reset pulse width of 150 ms (tMRP), synchronized to the internal timer.