Analog Devices Inc./Maxim Integrated MAX6408BS29+T

Overview

MAX6408BS29+T from Maxim Integrated is an ultra-low-power, open-drain, active-low voltage detector optimized for battery monitoring in portable systems. It features a factory-trimmed 2.93V threshold (±2.5% over -40°C to +85°C), 500nA supply current at 3V, manual reset input with internal 50kΩ pullup, and guaranteed valid output down to VCC = 1.0V. It is used in MP3 players and PDAs to trigger system reset during brownout conditions.

For engineers reviewing the MAX6408BS29+T datasheet, MAX6408BS29+T pinout, MAX6408BS29+T application, or MAX6408BS29+T equivalent, key selection criteria include its 2.93V detection threshold, open-drain output configuration, UCSP-4 package footprint, and immunity to sub-100ns VCC transients - all critical for space-constrained, battery-sensitive designs.

Technical Context

The MAX6408BS29+T implements a precision bandgap reference comparator with hysteresis of 6.3mV, enabling stable trip-point behavior despite noise on VCC. Its detection circuitry ignores fast negative-going transients below defined overdrive-duration limits, as verified by the Maximum Transient Duration vs. Threshold Overdrive curve.

It integrates a manual reset (MR) input with internal 50kΩ pullup and 1µs minimum pulse width requirement; MR assertion forces OUT low regardless of VCC level. The open-drain output supports flexible logic interfacing via external pullup to any voltage ≤5.5V, decoupling detector operation from host logic supply rails.

Key Specifications

Pinout & Package

MAX6408BS29+T is housed in a 4-bump, 2mm × 2mm UCSP (Ultra Compact Silicon Package) with bottom-side solder bumps. This chip-scale package reduces board area by 70% versus SC70 and targets ultra-portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803EB29DBZR and TPS3808G33DBVR, the MAX6408BS29+T uniquely combines 2.93V detection, open-drain output, manual reset, and 500nA quiescent current in a 2×2mm UCSP - making it optimal for ultra-compact, battery-critical applications where MR control and minimal loading are mandatory.

Availability

MAX6408BS29+T is available at Aetrix Electronics and suitable for portable audio devices, handheld computing equipment, and wearable health monitors requiring stable component supply and long-term lifecycle support.

Supply support for MAX6408BS29+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 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 portable electronics, emphasizing minimal footprint, nanoscale current draw, and factory-trimmed accuracy without external components.

FAQ

What is the exact reset threshold voltage of the MAX6408BS29+T?

The MAX6408BS29+T has a nominal reset threshold of 2.93V, with guaranteed tolerance of ±2.5% across the full operating temperature range of -40°C to +85°C. This value is factory-trimmed and specified in Table 1 of the datasheet under suffix "29". The MAX6408BS29+T does not require external calibration or resistor networks to achieve this accuracy.

Does the MAX6408BS29+T support manual reset functionality?

Yes, the MAX6408BS29+T includes a dedicated MR (manual reset) input on pin B2. It features an internal 50kΩ pullup resistor to VCC, so the pin can be left unconnected if unused. Driving MR low for ≥1µs forces the open-drain OUT pin low, independent of VCC level - enabling operator-initiated or test-system-triggered resets in the MAX6408BS29+T.

What package type and dimensions does the MAX6408BS29+T use?

The MAX6408BS29+T uses a 4-bump UCSP (Ultra Compact Silicon Package) with 2mm × 2mm body size and bottom-side solder bumps. This chip-scale package occupies 70% less board area than SC70 packages and is optimized for space-constrained portable designs. The pinout is fixed: A1=GND, A2=VCC, B1=OUT, B2=MR.

Can the MAX6408BS29+T operate with supply voltages below 2.93V?

Yes, the MAX6408BS29+T is fully functional down to VCC = 1.2V and guarantees valid output logic states (including correct OUT assertion) down to VCC = 1.0V. This allows the MAX6408BS29+T to remain active and issue a clean reset signal even as the monitored battery discharges well below its 2.93V threshold - a critical capability for graceful shutdown in portable systems.

What is the maximum transient immunity of the MAX6408BS29+T?

The MAX6408BS29+T rejects short negative-going VCC transients based on overdrive magnitude: for example, a 100mV drop below threshold (VTH − VCC = 100mV) is tolerated for up to ~200µs without triggering OUT. This immunity is characterized in the "Maximum Transient Duration vs. Threshold Overdrive" graph (Figure 4) and ensures reliable operation in noisy DC/DC converter environments for the MAX6408BS29+T.