Analog Devices Inc./Maxim Integrated MAX6781LTC+T

Overview

MAX6781LTC+T from Maxim Integrated is a dual-channel, 1%-accurate battery monitor in a 6-pin µDFN (1.0mm × 1.5mm) package, designed for monitoring two independent battery voltage levels-e.g., early-warning and critical-low thresholds-in single-cell Li+ or multicell alkaline/NiMH systems. It features factory-set 10% hysteresis, 3µA supply current, push-pull LBO1 and open-drain LBO2 outputs, and guaranteed operation down to VBATT = 1V.

For engineers reviewing the MAX6781LTC+T datasheet, MAX6781LTC+T pinout, MAX6781LTC+T application, or MAX6781LTC+T equivalent, this device supports precise dual-threshold battery supervision in space-constrained portable electronics where low quiescent current, noise immunity, and output flexibility (push-pull + open-drain) are essential.

Technical Context

The MAX6781LTC+T implements fixed-hysteresis dual monitoring using an internal 1.222V reference with factory-trimmed falling thresholds (VLBIF = 1.0998V for 10% hysteresis). Its architecture separates LBI1/LBI2 inputs for independent voltage sensing and assigns dedicated LBO1 (push-pull) and LBO2 (open-drain) outputs with propagation delay <9µs and startup time <3ms.

It operates across -40°C to +85°C with input leakage <±5nA, enabling high-impedance resistive dividers, and maintains valid logic states down to 1V supply-critical for deep-discharge detection in Li+ cells. The µDFN package supports thermal performance up to 168mW at +70°C with 2.1mW/°C derating.

Key Specifications

Pinout & Package

MAX6781LTC+T uses a 6-pin µDFN package (1.0mm × 1.5mm, 0.5mm pitch), optimized for ultra-compact portable designs. Pin 1 = BATT, Pin 2 = LBO1, Pin 3 = LBO2, Pin 4 = LBI2, Pin 5 = LBI1, Pin 6 = GND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6780LTB+T, MAX6781LTC+T offers superior MCU integration via push-pull LBO1; versus TLV7032IDR, it delivers guaranteed 1% accuracy and 10% hysteresis without external components-reducing design risk and test overhead.

Availability

MAX6781LTC+T is available at Aetrix Electronics and suitable for portable medical devices, smart wearables, industrial handheld scanners, and wireless audio transmitters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6781LTC+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, sensing, and interface applications in industrial, medical, and consumer systems.

The MAX6775–MAX6781 family targets ultra-low-power battery supervision-specifically engineered to replace discrete resistor-divider/comparator solutions in space- and current-constrained portable electronics.

FAQ

What is the exact hysteresis value configured in MAX6781LTC+T?

The "C" suffix in MAX6781LTC+T denotes 10% factory-set hysteresis. This yields a falling threshold (VLBIF) of 1.0998V and rising threshold (VLBIR) of 1.222V, resulting in a 122mV hysteresis window referenced to the internal 1.222V bandgap. This value is trimmed at wafer test and guaranteed over -40°C to +85°C.

Can MAX6781LTC+T monitor two different battery chemistries simultaneously?

Yes-MAX6781LTC+T supports independent voltage monitoring via LBI1 and LBI2 inputs. Each input accepts a separate resistive divider, allowing distinct thresholds for, e.g., a Li+ cell (monitored at 2.8V–3.6V) and a backup supercapacitor (monitored at 1.8V–2.5V), provided both stay within the 1.2V–5.5V operating range.

What is the maximum sink current capability of LBO1 on MAX6781LTC+T?

LBO1 (push-pull) on MAX6781LTC+T guarantees sinking 3.2mA while maintaining VOL ≤ 0.3V when VBATT ≥ 4.5V and ambient temperature is -40°C to +85°C. At lower VBATT (e.g., 1.8V), it sinks 100µA with VOL ≤ 0.3V-sufficient to drive standard CMOS inputs directly.

Does MAX6781LTC+T require external components for basic operation?

No-MAX6781LTC+T operates with only a 0.1µF bypass capacitor on BATT-to-GND. Unlike adjustable-hysteresis variants, it needs no external resistors for threshold setting or hysteresis control. Pull-up resistors are optional (only for LBO2 if interfacing to higher-voltage logic).

How does MAX6781LTC+T ensure reliability during battery voltage transients?

MAX6781LTC+T is specified to reject short transients up to 100µs duration when overdriven by ≥100mV beyond threshold (per Typical Operating Characteristics Figure 3). Its 9µs propagation delay and internal hysteresis prevent false triggering from load-switching spikes or ESD-induced noise on the LBI inputs.