Analog Devices Inc./Maxim Integrated MAX6406BS26

Overview

MAX6406BS26 from Maxim Integrated is a precision ultra-low-power voltage detector IC used for monitoring battery and regulated system supply voltages in portable electronics. It features a factory-trimmed 2.63V threshold (±2.5% over -40°C to +85°C), 500nA supply current, active-low push-pull output, and manual reset input - enabling reliable power-on reset and brownout detection in space-constrained Li-ion-powered devices.

For engineers reviewing the MAX6406BS26 datasheet, MAX6406BS26 pinout, MAX6406BS26 application, or MAX6406BS26 equivalent, this device is selected for low-voltage supervision where sub-1µA quiescent current, guaranteed output validity down to VCC = 1.0V, immunity to short VCC transients, and chip-scale packaging are critical design requirements.

Technical Context

The MAX6406BS26 implements a precision bandgap reference comparator with hysteresis (6.3mV typical) to reject noise and transient-induced false triggers. Its internal 50kΩ MR pullup enables direct connection of a momentary switch to GND without external components.

It operates across VCC = 1.2V to 5.5V and guarantees correct output logic state down to 1.0V, supporting deep brownout detection. The device ignores fast negative-going VCC transients up to durations defined by the threshold overdrive - e.g., ≤140µs at 10mV overdrive - per the Maximum Transient Duration vs. Threshold Overdrive curve.

Key Specifications

Pinout & Package

MAX6406BS26 is housed in a 4-bump UCSP (Ultra Compact Silicon Package), 2mm × 2mm footprint, bottom-terminal chip-scale package. This package eliminates leads and reduces board area by 70% versus SC70.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6406BS25-T, the MAX6406BS26 offers later reset timing for extended runtime; compared with TLV803EB26DBZR, it delivers 3.6× lower supply current and integrated MR functionality - critical for compact, long-life portable systems.

Availability

MAX6406BS26 is available at Aetrix Electronics and suitable for portable/battery-powered equipment, medical wearables, and industrial handheld meters requiring stable component supply and long-term lifecycle support.

Supply support for MAX6406BS26 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 MAX6406–MAX6411 family was designed specifically for ultra-low-power voltage supervision in space-constrained portable electronics, emphasizing sub-µA quiescent current, factory-trimmed accuracy, and chip-scale packaging.

FAQ

What is the exact factory-trimmed threshold voltage of the MAX6406BS26?

The MAX6406BS26 has a nominal threshold voltage of 2.63V, 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 "26". The MAX6406BS26 maintains this accuracy without external calibration components.

Does the MAX6406BS26 require external components to operate?

No, the MAX6406BS26 requires no external components. Its precision bandgap reference, comparator, and internal 50kΩ MR pullup resistor are fully integrated. Only VCC, GND, MR (optional), and OUT connections are needed - eliminating resistors, capacitors, or trimming potentiometers typically used in discrete supervisor circuits.

Can the MAX6406BS26 output drive a microcontroller reset pin directly?

Yes, the MAX6406BS26's active-low push-pull output can drive standard µP reset pins directly. It sinks up to 1.6mA at VCC ≥ 2.1V with VOL ≤ 0.3V, meeting most microcontroller reset input low-level requirements. No external pullup resistor is needed, unlike open-drain alternatives such as the MAX6408BS26.

What is the minimum VCC voltage at which the MAX6406BS26 guarantees correct output logic state?

The MAX6406BS26 guarantees correct output logic state down to VCC = 1.0V. This ensures reliable reset assertion even during deep brownout or near-end-of-life battery conditions - a key differentiator versus many supervisors that fail or float below 1.5V.

How does the MAX6406BS26 handle fast transients on the VCC line?

The MAX6406BS26 is designed to ignore fast negative-going VCC transients. Its internal architecture rejects pulses shorter than the maximum duration defined by the threshold overdrive - e.g., ≤140µs at 10mV overdrive - as shown in Figure 4 of the datasheet. This eliminates need for external RC filters in noisy environments.