Analog Devices Inc./Maxim Integrated MAX6406BS25+T

Overview

MAX6406BS25+T from Maxim Integrated is an ultra-low-power voltage detector IC designed for battery and power-supply monitoring in portable systems. It features a factory-trimmed 2.50V threshold (±2.5% over –40°C to +85°C), active-low push-pull output, 500nA supply current at 3V, and guaranteed operation down to VCC = 1.0V - ideal for Li+-based MP3 players and pagers requiring reliable brownout detection.

For engineers reviewing the MAX6406BS25+T datasheet, MAX6406BS25+T pinout, MAX6406BS25+T application, or MAX6406BS25+T equivalent, key selection criteria include reset threshold accuracy, ultra-low ICC, manual reset input compatibility, open-drain vs. push-pull output logic, and UCSP-4 package integration into space-constrained PCB layouts.

Technical Context

The MAX6406BS25+T integrates a precision bandgap reference and comparator, trimmed to 2.50V nominal threshold with ±2.5% tolerance across –40°C to +85°C and 40ppm/°C tempco. Its internal 50kΩ MR pullup enables direct switch-to-GND manual reset without external components.

It asserts OUT low when VCC falls below 2.50V, with propagation delay of 20–42µs (depending on overdrive), immunity to transients ≤100ns, and valid output state guaranteed down to VCC = 1.0V - enabling robust operation during deep battery discharge or noisy supply conditions.

Key Specifications

Pinout & Package

MAX6406BS25+T is housed in a 2mm × 2mm, 4-bump UCSP (Ultra-Compact Silicon Package) with bottom-side solder bumps. The package is lead-free, RoHS-compliant, and optimized for high-density portable PCB assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803EB25DBZR and APX803S-25SA-7, the MAX6406BS25+T uniquely combines ultra-low 500nA current, integrated MR with pullup, and push-pull output in a 2×2mm UCSP - delivering higher integration, smaller footprint, and lower system-level component count for space- and battery-life-critical designs.

Availability

MAX6406BS25+T is available at Aetrix Electronics and suitable for portable medical sensors, Bluetooth headsets, and smart remote controls requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.

Supply support for MAX6406BS25+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 high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and consumer applications.

The MAX6406–MAX6411 family was designed specifically for ultra-low-power voltage monitoring in battery-operated equipment, emphasizing minimal ICC, small footprint, and factory-trimmed accuracy to replace discrete reset circuits in portable electronics.

FAQ

What is the exact reset threshold voltage of MAX6406BS25+T and its tolerance over temperature?

The MAX6406BS25+T has a nominal reset threshold of 2.50V, with ±1.5% tolerance at +25°C and ±2.5% over the full operating range of –40°C to +85°C. This is factory-trimmed and specified in Table 1 of the datasheet, with 40ppm/°C tempco ensuring stability across thermal environments. The MAX6406BS25+T maintains this accuracy without external calibration.

Does MAX6406BS25+T require external components for basic reset functionality?

No, the MAX6406BS25+T operates autonomously with no external components required. Its precision bandgap reference, comparator, and internal 50kΩ MR pullup eliminate the need for resistors, capacitors, or trimming networks. Only VCC, GND, MR (optional), and OUT connections are needed - making the MAX6406BS25+T a true single-chip solution for voltage supervision.

What is the minimum VCC voltage at which MAX6406BS25+T guarantees correct output logic state?

The MAX6406BS25+T guarantees valid output logic (OUT low when VCC < VTH) down to VCC = 1.0V, as explicitly stated in the datasheet's "Guaranteed OUT Valid to VCC = 1.0V" feature. This ensures reliable reset assertion even during deep battery discharge, a critical capability not shared by many competing detectors rated only to 1.2V or higher.

How does the manual reset (MR) input function on MAX6406BS25+T?

The MR input on MAX6406BS25+T is active-low with an internal 50kΩ pullup to VCC. Pulling MR to GND asserts OUT low immediately and holds it low as long as MR remains low. When released, MR returns high via the internal resistor, and OUT deasserts after propagation delay. No external pullup is needed - a key differentiator of the MAX6406BS25+T versus alternatives lacking integrated biasing.

Is MAX6406BS25+T compatible with standard reflow soldering processes?

Yes, the MAX6406BS25+T UCSP-4 package is qualified for standard Pb-free reflow profiles, with a maximum bump reflow temperature of +235°C. Its 2mm × 2mm footprint and bottom-solder bumps are compatible with automated SMT assembly, though users must follow Maxim's UCSP Reliability Notice regarding board material, pad design, and mechanical stress mitigation to ensure long-term solder joint integrity.