Analog Devices Inc./Maxim Integrated MAX6429PTUR+T

Overview

MAX6429PTUR+T from Maxim Integrated is a factory-trimmed, single-output, low-power battery monitor IC for Li+ and multi-cell alkaline/NiMH/NiCd systems. It features a fixed low-battery threshold (VLTH = 2.0V), high-threshold (VHTH = 2.7V), 140ms minimum LBO timeout, push-pull active-low 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 low-power mode when battery voltage drops below 2.0V.

For engineers reviewing the MAX6429PTUR+T datasheet, MAX6429PTUR+T pinout, MAX6429PTUR+T application, or MAX6429PTUR+T equivalent, key selection factors include its factory-set 2.0V/2.7V thresholds, SOT23-3 package compatibility, guaranteed LBO logic state down to BATT = 1.0V, immunity to short voltage transients, and absence of external components required for operation.

Technical Context

The MAX6429PTUR+T implements a dual-comparator architecture with internal 615mV reference, hysteresis control via factory-trimmed thresholds, and integrated 140ms timeout timer to prevent false triggering during battery recovery. Its push-pull LBO output is referenced directly to BATT, enabling direct interface with system power rails without level-shifting.

It functions as a dedicated single-level battery status detector - asserting LBO when BATT falls below 2.0V (±2.5%) and deasserting only after BATT rises above 2.7V (±2.5%) and remains stable for ≥140ms. No external resistors or capacitors are needed, and it guarantees valid output logic down to 1.0V BATT.

Key Specifications

Pinout & Package

MAX6429PTUR+T is housed in a lead-free 3-pin SOT23-3 package (JEDEC MO-178AA), with 1.3mm × 0.8mm footprint and 1.45mm height. Pin 1 = BATT, Pin 2 = LBO, Pin 3 = GND - no VDD or adjustment pins required.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6428PTUR+T, MAX6429PTUR+T provides higher hysteresis (700mV vs. 700mV nominal but tighter tolerance), while TLV7031DBVR demands 4 additional passives and lacks guaranteed 1.0V operation - making MAX6429PTUR+T optimal for cost-sensitive, space-constrained, single-chemistry designs.

Availability

MAX6429PTUR+T is available at Aetrix Electronics and suitable for portable medical devices, MP3 players, and electronic toys requiring stable component supply with long-term lifecycle assurance and RoHS-compliant lead-free packaging.

Supply support for MAX6429PTUR+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 status monitoring in space-constrained portable electronics - delivering factory-trimmed precision and zero-component simplicity for rapid time-to-market.

FAQ

What is the exact low-battery threshold voltage for MAX6429PTUR+T?

The MAX6429PTUR+T has a factory-trimmed low-threshold voltage (VLTH) of 2.0V ±2.5%, meaning it asserts the LBO output when the BATT voltage falls below 1.95V minimum and 2.05V maximum across temperature and process variation. This value is laser-trimmed during production and does not require external calibration.

Does MAX6429PTUR+T require any external components to operate?

No, MAX6429PTUR+T requires no external components - it integrates the reference, comparators, hysteresis control, and 140ms timeout timer. Only three connections are needed: BATT (Pin 1), LBO (Pin 2), and GND (Pin 3). This eliminates resistor dividers, capacitors, or pull-ups required by general-purpose comparators.

Can MAX6429PTUR+T operate reliably at 1.0V battery voltage?

Yes, MAX6429PTUR+T guarantees valid LBO logic state (high or low) down to BATT = 1.0V, per its Absolute Maximum Ratings and Electrical Characteristics table. This ensures deterministic behavior during deep discharge - critical for preventing undefined resets in coin-cell–powered devices.

What is the function of the LBO pin on MAX6429PTUR+T?

The LBO pin on MAX6429PTUR+T is an active-low push-pull output that asserts (drives low) when BATT falls below 2.0V and remains asserted for ≥140ms after BATT rises above 2.7V. It can directly drive microprocessor NMI, reset, or enable inputs without external pull-up resistors.

Is MAX6429PTUR+T pin-compatible with other parts in the MAX6427–MAX6438 family?

MAX6429PTUR+T shares the same SOT23-3 package and pinout (BATT–LBO–GND) with MAX6427PTUR+T and MAX6428PTUR+T. However, it is not pin-compatible with dual-output or adjustable-threshold variants (e.g., MAX6430/MAX6433), which use 4-, 5-, or 6-pin packages and different pin assignments.