Analog Devices Inc./Maxim Integrated MAX6411BS44-T

Overview

MAX6411BS44-T from Maxim Integrated is an ultra-low-power, open-drain, active-low voltage detector IC designed for battery and power-supply monitoring in portable electronics. It features a factory-trimmed 4.38V threshold (±2.5% over −40°C to +85°C), 500nA supply current at 3V, guaranteed valid output down to VCC = 1.0V, and integrated manual reset input with 50kΩ internal pullup. It is used in Li+-powered MP3 players to prevent system operation below safe battery voltage.

For engineers reviewing the MAX6411BS44-T datasheet, MAX6411BS44-T pinout, MAX6411BS44-T application, or MAX6411BS44-T equivalent, key selection criteria include its open-drain active-low reset output, 4.38V detection threshold with 9.5mV hysteresis, immunity to sub-100ns VCC transients, and UCSP-4 package compatibility with space-constrained handheld designs.

Technical Context

The MAX6411BS44-T implements a precision bandgap reference comparator architecture with factory-laser-trimmed threshold voltage. Its open-drain output requires an external pullup and sinks current when asserted (OUT low during undervoltage), enabling flexible logic-level interfacing up to 5.5V.

It incorporates a manual reset (MR) input with internal 50kΩ pullup and 1µs minimum pulse width requirement; MR assertion forces OUT low independently of VCC level. The device ignores fast negative-going VCC transients ≤100ns and guarantees correct output state down to VCC = 1.0V.

Key Specifications

Pinout & Package

MAX6411BS44-T is housed in a 4-bump, 2mm × 2mm UCSP (Ultra Compact Silicon Package) with bottom-side solder bumps. This chip-scale package delivers 70% area reduction versus SC70 and requires PCB assembly optimization per Maxim's UCSP reliability guidelines.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage detector applications.

Compared with MAX6411BS43-T, the MAX6411BS44-T offers an 80mV higher trip point for improved margin against false resets in noisy environments; versus TLV803EB33DBZR, it delivers 3.2× lower supply current, integrated MR, and smaller UCSP-4 footprint-critical for miniaturized portable designs.

Availability

MAX6411BS44-T is available at Aetrix Electronics and suitable for portable audio devices, wearable health monitors, medical PDAs, and industrial handheld scanners requiring stable component supply with long-term lifecycle support.

Supply support for MAX6411BS44-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 U.S.-based semiconductor company specializing in analog and mixed-signal ICs for power, sensing, and interface applications.

The MAX6406–MAX6411 family was designed specifically for ultra-low-power voltage supervision in space-constrained, battery-operated equipment-emphasizing minimal ICC, factory-trimmed accuracy, and chip-scale packaging.

FAQ

What is the exact factory-trimmed threshold voltage of the MAX6411BS44-T?

The MAX6411BS44-T has a nominal reset threshold of 4.38V, with tolerance of ±2.5% over the full operating temperature range (−40°C to +85°C). This value is laser-trimmed at wafer test and confirmed in Table 1 of the datasheet under suffix "44*". The MAX6411BS44-T is part of the MAX6409–MAX6411 subgroup, which covers thresholds from 3.30V to 4.63V.

Does the MAX6411BS44-T require external components to operate?

No, the MAX6411BS44-T requires no external components for basic voltage detection functionality. Its precision bandgap reference, comparator, and internal 50kΩ MR pullup are fully integrated. Only an external pullup resistor on the open-drain OUT pin is needed to establish a logic-high state-no resistor divider, capacitor, or trimming network is required.

Can the MAX6411BS44-T output interface directly with a 1.8V microcontroller reset input?

Yes, the MAX6411BS44-T's open-drain OUT can interface directly with a 1.8V µC reset pin. Connect the external pullup resistor to the 1.8V rail (not VCC). When asserted, OUT sinks current and pulls the node to <0.4V (guaranteed VOL), satisfying 1.8V logic-low requirements. Leakage is only 0.1µA when not asserted, ensuring clean high-level signaling.

What is the minimum VCC voltage at which the MAX6411BS44-T guarantees correct output logic state?

The MAX6411BS44-T guarantees correct output logic state (i.e., OUT reflects actual VCC vs. threshold condition) down to VCC = 1.0V. This is explicitly stated in the datasheet's Features list and Electrical Characteristics table, enabling reliable reset assertion even during deep brownout or battery exhaustion scenarios.

How does the manual reset (MR) input behave when left unconnected?

When the MR input of the MAX6411BS44-T is left unconnected, its internal 50kΩ pullup resistor biases it to VCC, rendering it inactive. The device operates solely based on VCC monitoring. To assert reset manually, pull MR to GND via a switch or logic signal; OUT will go low and remain low as long as MR is held low, independent of VCC level.