Analog Devices Inc./Maxim Integrated MAX6408BS29-T

Overview

The MAX6408BS29-T from Maxim Integrated is an ultra-low-power, open-drain, active-low voltage detector optimized for battery and power-supply monitoring in portable electronics. It features a factory-trimmed 2.93V 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 controlled shutdown before brownout.

For engineers reviewing the MAX6408BS29-T datasheet, MAX6408BS29-T pinout, MAX6408BS29-T application, or MAX6408BS29-T equivalent, key selection criteria include its open-drain active-low reset output, 2.93V detection threshold with hysteresis, UCSP-4 package compatibility with space-constrained PCB layouts, and immunity to sub-200ns VCC transients.

Technical Context

The MAX6408BS29-T implements a precision bandgap reference comparator with factory-trimmed threshold and built-in 6.3mV hysteresis to prevent chatter during slow VCC transitions. Its open-drain output requires an external pullup and supports interfacing to logic supplies up to 5.5V independent of VCC.

It integrates a manual reset input (MR) with internal 50kΩ pullup, TTL/CMOS-compatible thresholds, and guarantees correct output state down to VCC = 1.0V - enabling reliable operation during deep battery discharge. Propagation delay is 42µs (typ) for VCC falling through threshold.

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 delivers 70% smaller footprint than SC70 while maintaining standard reflow compatibility.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6406BS29-T, the MAX6408BS29-T enables shared reset buses and flexible logic-level interfacing, while TLV803EB29DBZR offers lower quiescent current but sacrifices MR functionality and package compatibility.

Availability

MAX6408BS29-T is available at Aetrix Electronics and suitable for portable medical devices, BLE beacons, Li+-powered audio players, and smart pagers requiring stable component supply across extended production lifecycles.

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 solutions for industrial, communications, and consumer applications.

The MAX6406–MAX6411 family was designed specifically for ultra-low-power voltage supervision in space-constrained, battery-operated equipment - emphasizing minimal quiescent current, factory-trimmed accuracy, and chip-scale packaging.

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% over the full temperature range (–40°C to +85°C). This value is factory-trimmed and specified in Table 1 of the datasheet under suffix "29". The MAX6408BS29-T achieves this accuracy without external components or calibration.

Does the MAX6408BS29-T require an external pullup resistor on the OUT pin?

Yes, the MAX6408BS29-T features an open-drain OUT pin and requires an external pullup resistor to establish a valid logic-high level when the output is not asserted. The resistor value must be selected to ensure VOL ≤ 0.4V at ISINK = 1.6mA while supporting all connected loads - typically 10kΩ to 100kΩ depending on bus capacitance and logic family.

Can the MAX6408BS29-T operate reliably below 1.2V?

No - the absolute minimum recommended VCC is 1.2V for guaranteed operation across temperature. Although the output remains valid down to VCC = 1.0V per specification, the device is not characterized or guaranteed for functional operation below 1.2V. The MAX6408BS29-T datasheet specifies 1.2V as the lower limit of the operating supply range.

What is the function of the MR pin on the MAX6408BS29-T?

The MR (Manual Reset) pin on the MAX6408BS29-T is an active-low input that forces the OUT pin low regardless of VCC level when asserted. It includes an internal 50kΩ pullup to VCC, so it may be left unconnected if unused. The MAX6408BS29-T uses MR to enable operator-initiated or test-system–driven resets without cycling power.

Is the MAX6408BS29-T RoHS-compliant and lead-free?

The MAX6408BS29-T is available in both leaded and lead-free versions. The standard tape-and-reel part number MAX6408BS29-T is not RoHS-compliant; the RoHS/lead-free variant is designated MAX6408BS29+T. Both share identical electrical specifications and UCSP-4 packaging, differing only in finish and compliance documentation.