Analog Devices Inc./Maxim Integrated MAX6408BS26

Overview

MAX6408BS26 from Maxim Integrated is an ultra-low-power, open-drain, active-low voltage detector designed for battery and power-supply monitoring in portable electronics. It features a factory-trimmed 2.63V 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 trigger microcontroller reset during brownout.

For engineers reviewing the MAX6408BS26 datasheet, MAX6408BS26 pinout, MAX6408BS26 application, or MAX6408BS26 equivalent, key selection criteria include its open-drain output configuration, 2.63V detection threshold with hysteresis, immunity to sub-100ns VCC transients, and UCSP-4 package compatibility with space-constrained PCB layouts.

Technical Context

The MAX6408BS26 employs a precision bandgap reference comparator architecture with factory-laser trimming for threshold accuracy. Its open-drain output requires an external pullup resistor and supports interfacing to logic supplies up to 5.5V independent of VCC.

It incorporates glitch rejection circuitry that ignores negative-going VCC transients ≤100ns and guarantees correct output state down to 1.0V supply-enabling reliable operation during deep battery discharge or low-voltage startup sequences.

Key Specifications

Pinout & Package

MAX6408BS26 is housed in a 4-bump, 2mm × 2mm UCSP (Ultra Compact Silicon Package) with bottom-side solder bumps. The package is RoHS-compliant and qualified for surface-mount assembly per JEDEC J-STD-020 reflow profiles.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6406BS26 and TLV803EB26DBZR, the MAX6408BS26 uniquely combines open-drain flexibility, integrated MR, and ultra-low ICC-making it optimal for systems needing both programmable reset initiation and multi-rail compatibility without added components.

Availability

MAX6408BS26 is available at Aetrix Electronics and suitable for portable audio devices, wearable health sensors, and industrial handheld terminals requiring stable component supply and long-term manufacturability.

Supply support for MAX6408BS26 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) designs precision analog, mixed-signal, and power management ICs for demanding industrial, medical, and communications applications.

The MAX6406–MAX6411 family was engineered specifically for ultra-low-power voltage supervision in battery-critical portable equipment, emphasizing nanoscale current consumption and minimal board footprint.

FAQ

What is the exact factory-trimmed threshold voltage of MAX6408BS26?

The MAX6408BS26 has a nominal reset threshold of 2.63V, with a guaranteed 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 MAX6408BS26 maintains this accuracy without external calibration components.

Does MAX6408BS26 require an external pullup resistor on the OUT pin?

Yes, the MAX6408BS26 features an open-drain output and requires an external pullup resistor connected between OUT and the target logic rail (up to 5.5V). The resistor value must be selected to ensure VOL ≤ 0.4V at ISINK = 1.6mA while providing sufficient rise time for the driven load. Typical values range from 10kΩ to 100kΩ depending on bus capacitance.

Can MAX6408BS26 operate reliably below 1.8V supply?

Yes, the MAX6408BS26 is fully specified down to VCC = 1.0V and guarantees correct output logic state across that entire range. Its internal bandgap reference and comparator remain functional at 1.0V, enabling use in ultra-low-voltage applications such as deeply discharged Li+ cells or energy-harvesting systems with buck-boost regulators.

How does the manual reset (MR) input behave on MAX6408BS26?

The MR input on MAX6408BS26 is active-low with an internal 50kΩ pullup to VCC. When pulled low (≤0.8V), it forces OUT to assert (low) regardless of VCC level. MR remains effective down to VCC = 1.0V, and its 1µs minimum pulse width requirement ensures noise immunity. Leaving MR unconnected defaults to inactive (high) due to the internal pullup.

Is MAX6408BS26 compatible with lead-free reflow processes?

Yes, MAX6408BS26 is available in RoHS-compliant, lead-free versions (e.g., MAX6408BS26+T) qualified for standard Pb-free reflow profiles with peak temperatures up to +260°C. The UCSP-4 package meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1) and supports both vapor phase and convection reflow.