Analog Devices Inc./Maxim Integrated MAX6406BS26-T

Overview

The MAX6406BS26-T from Maxim Integrated is a precision ultra-low-power voltage detector IC designed for battery and power-supply monitoring in portable systems. It features a factory-trimmed 2.63V detection threshold (±2.5% over –40°C to +85°C), active-low push-pull output, 500nA supply current, manual reset input (MR), and guaranteed valid output down to VCC = 1.0V. It is used in Li+-powered MP3 players to prevent system corruption during brownout conditions.

For engineers reviewing the MAX6406BS26-T datasheet, MAX6406BS26-T pinout, MAX6406BS26-T application, or MAX6406BS26-T equivalent, key selection criteria include reset threshold accuracy, ultra-low quiescent current, UCSP-4 package footprint constraints, and compatibility with 1.0V–5.5V supply rails in space-constrained battery-powered designs.

Technical Context

This device implements a precision bandgap reference comparator with internal trimming to achieve ±2.5% threshold accuracy across –40°C to +85°C. Its propagation delay is 42µs (typical) for VCC falling below threshold, and it includes built-in immunity to fast VCC transients (e.g., <100ns glitches).

The MR input has an internal 50kΩ pullup and accepts TTL/CMOS logic levels; asserting MR forces OUT low regardless of VCC level. The push-pull output drives high (VOH ≥ 0.8×VCC) when not asserted and low (VOL ≤ 0.4V) when asserted, eliminating need for external pullups.

Key Specifications

Pinout & Package

MAX6406BS26-T is housed in a 4-bump UCSP (Ultra Compact Silicon Package), measuring 2mm × 2mm with 0.5mm bump pitch. This chip-scale package requires specialized PCB assembly but reduces board area by 70% versus SC70.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6406BS27-T, the MAX6406BS26-T offers tighter alignment with 2.6V Li+ cutoff profiles; versus TPS3123QDBVRQ1, it delivers 3.6× lower supply current and 45% smaller footprint but lacks automotive qualification.

Availability

MAX6406BS26-T is available at Aetrix Electronics and suitable for portable electronics, battery management systems, and microcontroller supervision requiring stable component supply with long-term lifecycle support.

Supply support for MAX6406BS26-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 analog and mixed-signal ICs for power, sensing, and interface applications.

The MAX6406–MAX6411 family was designed specifically for ultra-low-power voltage monitoring in space-constrained portable equipment, emphasizing sub-1µA operation, chip-scale packaging, and factory-trimmed accuracy.

FAQ

What is the exact detection threshold voltage of the MAX6406BS26-T?

The MAX6406BS26-T has a nominal detection threshold of 2.63V, with guaranteed tolerance of ±2.5% over the full operating temperature range (–40°C to +85°C). This value is factory-trimmed and documented in Table 1 of the datasheet under suffix "26".

Does the MAX6406BS26-T require external components to operate?

No, the MAX6406BS26-T requires no external components. It integrates a precision bandgap reference, comparator, and push-pull output driver. The MR input includes an internal 50kΩ pullup resistor, and the output drives rail-to-rail without needing external pullups or capacitors.

Can the MAX6406BS26-T function when VCC drops below 2.0V?

Yes, the MAX6406BS26-T guarantees valid output logic states down to VCC = 1.0V. Its internal circuitry remains functional and the OUT pin correctly asserts low when VCC falls below 2.63V, even at 1.0V supply - a key feature for deep brownout protection.

What package type does the MAX6406BS26-T use, and what are its dimensions?

The MAX6406BS26-T uses a 4-bump UCSP (Ultra Compact Silicon Package) with 2mm × 2mm body size and 0.5mm bump pitch. This chip-scale package is 70% smaller than SC70 and requires compliant PCB assembly processes per Maxim's UCSP reliability guidelines.

How does the manual reset (MR) input behave on the MAX6406BS26-T?

The MR input on the MAX6406BS26-T is active-low with an internal 50kΩ pullup to VCC. Pulling MR to GND asserts OUT low immediately and holds it low as long as MR remains low. If unused, MR may be left floating or tied to VCC; no external pullup is needed.