Analog Devices Inc./Maxim Integrated MAX6785TCC+

Overview

MAX6785TCC+ from Maxim Integrated is a low-power, triple-level battery monitor IC with 1% threshold accuracy over -40°C to +85°C, open-drain outputs, and factory-set 10% hysteresis (C version), designed for precise voltage monitoring in single-cell Li+ or multicell alkaline/NiMH/NiCd systems. It features three independent low-battery detection channels, reference output (0.6085 V), and operates down to VBATT = 1.2 V.

For engineers reviewing the MAX6785TCC+ datasheet, MAX6785TCC+ pinout, MAX6785TCC+ application, or MAX6785TCC+ equivalent, key selection considerations include its 12-pin TQFN-EP package, 5.7 µA supply current at 1.8 V, 0.5477 V falling threshold (10% hysteresis), open-drain LBO outputs requiring external pullups, and compatibility with battery-powered portable medical devices, MP3 players, and pagers.

Technical Context

The MAX6785TCC+ implements three independent comparator sections, each comparing an external resistive-divider-scaled battery voltage against a precision internal 0.6085 V reference. Hysteresis is factory-trimmed to 10% (VINF = 0.5477 V, VINR = 0.6085 V) and fixed via HADJx pins tied to GND. Each channel drives a dedicated active-low open-drain LBO output.

It uses a bandgap-derived reference with 15 ppm/°C temperature coefficient and supports operation from 1.2 V to 5.5 V supply. Input leakage is ≤5 nA per INx pin, enabling high-impedance divider designs, and the REF output sources up to 1 mA without external capacitance (capacitive load <50 pF).

Key Specifications

Pinout & Package

MAX6785TCC+ is housed in a 12-pin, 3 mm × 3 mm, 0.8 mm height TQFN-EP package with exposed pad (EP) for thermal enhancement and grounding. Pin 1 is marked by a dot or beveled corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6784TCC+, MAX6785TCC+ offers open-drain flexibility for voltage translation and bus sharing but requires external pullups; versus TLV70333DBVR, it delivers true triple-level intelligence with programmable thresholds and hysteresis-enabling graduated system responses impossible with single-supervisor ICs.

Availability

MAX6785TCC+ is available at Aetrix Electronics and suitable for portable medical devices, MP3 players, and electronic toys requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX6785TCC+ 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 MAX6782–MAX6790 family was designed specifically for ultra-low-power, high-accuracy battery voltage supervision in space-constrained portable electronics, emphasizing 1% threshold stability, minimal quiescent current, and flexible hysteresis architecture.

FAQ

What is the guaranteed operating voltage range for MAX6785TCC+?

The MAX6785TCC+ is fully specified from VBATT = 1.2 V to 5.5 V across -40°C to +85°C. Below 1.2 V, the low-battery output logic state is not guaranteed, though the device remains functional down to 1.05 V. This range supports deep discharge detection in single-cell Li+ and multicell alkaline systems.

How does the 10% hysteresis in MAX6785TCC+ affect threshold design?

In MAX6785TCC+, the 10% hysteresis means the falling threshold is 0.5477 V and rising threshold is 0.6085 V - a fixed 60.8 mV gap. When designing external resistor dividers, this ensures the output remains asserted until battery voltage recovers by at least 60.8 mV, preventing chatter during transient load release.

Can MAX6785TCC+ monitor voltages above 5.5 V?

Yes - the MAX6785TCC+ itself operates only up to 5.5 V on BATT, but its IN1–IN3 inputs tolerate voltages up to Min(VBATT + 0.3 V, +6 V). To monitor higher battery stacks, power the device from a regulated 3.3 V or 5 V rail and feed scaled-down divider voltages (≤0.6085 V) into INx pins.

What is the purpose of the REF pin on MAX6785TCC+?

The REF pin on MAX6785TCC+ provides a stable 0.6085 V reference output usable for calibrating external resistor dividers or biasing other circuitry. It sources up to 1 mA and remains accurate within ±0.0061 V over temperature - eliminating need for external references in precision battery-monitoring designs.

Does MAX6785TCC+ require external capacitors for stability?

No - the MAX6785TCC+ REF output is stable without external capacitance and tolerates up to 50 pF. However, a 0.1 µF ceramic capacitor from BATT to GND is mandatory for noise immunity. No bypass cap is needed on INx or HADJx pins due to high-impedance inputs.