Analog Devices Inc./Maxim Integrated MAX6406BS29+T

Overview

MAX6406BS29+T from Maxim Integrated is an ultra-low-power, factory-trimmed voltage detector IC designed for battery and power-supply monitoring in portable systems. It features a 2.93V ±2.5% threshold, active-low push-pull output, 500nA supply current at +25°C, manual reset input (MR), and guaranteed valid output down to VCC = 1.0V - enabling reliable brownout detection in Li+-powered MP3 players and PDAs.

For engineers reviewing the MAX6406BS29+T datasheet, MAX6406BS29+T pinout, MAX6406BS29+T application, or MAX6406BS29+T equivalent, key selection criteria include its 2.93V trip point, UCSP-4 package footprint, immunity to sub-100ns VCC transients, and compatibility with 1.0–5.5V supply rails in space-constrained, battery-sensitive designs.

Technical Context

The MAX6406BS29+T integrates a precision bandgap reference and comparator trimmed to 2.93V nominal threshold, with ±2.5% accuracy over –40°C to +85°C. Its internal 50kΩ MR pullup enables direct switch-to-GND manual reset without external components.

It employs hysteresis of 6.3mV to prevent chatter during slow VCC decay and rejects fast negative transients via built-in glitch immunity - propagation delay is 20–42µs depending on overdrive, and startup time is 88µs from VCC=0 to threshold.

Key Specifications

Pinout & Package

MAX6406BS29+T is housed in a 4-bump, 2mm × 2mm UCSP (Ultra Compact Silicon Package) with bottom-side solder bumps - footprint is 70% smaller than SC70 and optimized for ultra-dense PCB layouts in handheld devices.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G12DBVR and ADM6315-29ARTZ-R7, the MAX6406BS29+T uniquely delivers 2.93V accuracy, 500nA ICC, MR support, and UCSP-4 size - making it the only option meeting all four requirements simultaneously for compact, long-life battery systems.

Availability

MAX6406BS29+T is available at Aetrix Electronics and suitable for portable medical monitors, wearable fitness trackers, and industrial handheld scanners requiring stable component supply, long-term lifecycle support, and tape-and-reel delivery for automated assembly.

Supply support for MAX6406BS29+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 supervision in space-constrained portable electronics - prioritizing nanoscale ICC, chip-scale packaging, and factory-trimmed thresholds to eliminate calibration overhead.

FAQ

What is the exact reset threshold voltage of the MAX6406BS29+T?

The MAX6406BS29+T has a nominal reset threshold of 2.93V, with ±2.5% tolerance over the full –40°C to +85°C operating temperature range. At +25°C, the threshold is specified as 2.886V (min) to 2.974V (max), per Table 1 in the datasheet. This value is factory-trimmed and does not require external resistor networks.

Does the MAX6406BS29+T support manual reset, and how is it implemented?

Yes, the MAX6406BS29+T includes a dedicated MR (manual reset) pin (B2) with an internal 50kΩ pullup resistor to VCC. Driving MR low for ≥1µs forces the OUT pin low regardless of VCC level. The pin accepts TTL/CMOS logic levels and can be interfaced directly with a momentary switch to GND - no external components are needed for basic manual reset functionality.

What package type and dimensions does the MAX6406BS29+T use?

The MAX6406BS29+T uses a 4-bump UCSP (Ultra Compact Silicon Package) measuring 2.0mm × 2.0mm with bottom-side solder bumps. It is not a leaded package - the bumps align to a 0.5mm pitch grid (A1/GND, A2/VCC, B1/OUT, B2/MR). This footprint is 70% smaller than SC70 and requires compatible reflow and inspection processes.

Can the MAX6406BS29+T operate below 1.8V, and what happens to the output?

Yes, the MAX6406BS29+T is fully specified down to VCC = 1.0V. Its output remains valid and functional across this entire range: OUT correctly asserts low when VCC falls below 2.93V, and de-asserts high when VCC rises above threshold + hysteresis (≈2.936V), even at VCC = 1.2V. This guarantees robust reset behavior during deep battery discharge.

How does the MAX6406BS29+T handle short voltage transients on the VCC line?

The MAX6406BS29+T is designed to ignore fast negative-going VCC transients. Its internal architecture provides 100ns glitch rejection on the MR pin and inherent immunity to transients ≤100ns duration at typical overdrive levels. The "Maximum Transient Duration vs. Threshold Overdrive" curve (Figure 4) confirms it suppresses pulses that would otherwise cause false resets in noisy power environments.