Analog Devices Inc./Maxim Integrated MAX1726EUK25+T

Overview

MAX1726EUK25+T from Maxim Integrated is a fixed-output, ultra-low quiescent current (2µA), low-dropout linear regulator delivering 2.5V at up to 20mA with ±1.5% output voltage accuracy over -40°C to +85°C. It features reverse-battery protection, thermal shutdown, and short-circuit foldback limiting, and is designed for microcontroller power, real-time clock backup, and smoke detector systems powered by two Li+ cells or 9V batteries.

For engineers reviewing the MAX1726EUK25+T datasheet, MAX1726EUK25+T pinout, MAX1726EUK25+T application, or MAX1726EUK25+T equivalent, key selection criteria include guaranteed 20mA output under 2.5V fixed regulation, 1µF minimum output capacitance requirement, 2.5V to 12V input range compatibility, and SOT23-5 package constraints for space-constrained battery-powered designs.

Technical Context

The MAX1726EUK25+T integrates a p-channel MOSFET pass transistor controlled by a 1.245V internal error amplifier, enabling ultra-low IQ operation across full load and dropout conditions without base-drive current penalties. Its feedback network is internal-no external resistors required-unlike the adjustable MAX1725 variant.

Shutdown is active-low via SHDN pin (VIH = 0.5V threshold), reducing supply current to 0.7µA; thermal protection activates at +150°C with 15°C hysteresis, and foldback current limiting caps short-circuit output current at ~40mA (typ) to prevent damage during indefinite ground faults.

Key Specifications

Pinout & Package

MAX1726EUK25+T is housed in a RoHS-compliant, lead(Pb)-free 5-pin SOT23 package (outline 21-0057, land pattern 90-0174), measuring 2.9mm × 1.6mm × 1.1mm, optimized for high-density PCB layouts in portable equipment.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-quiescent-current LDO regulator applications.

Compared with TPS78225DRVR and MCP1700-2502E/TO, the MAX1726EUK25+T uniquely balances ultra-low 2µA IQ, built-in reverse-battery protection, and 1µF capacitor compatibility-making it optimal for safety-critical, space-constrained, long-life battery systems where reliability trumps raw current capability.

Availability

MAX1726EUK25+T is available at Aetrix Electronics and suitable for smoke detectors, remote transmitters, and smart battery packs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX1726EUK25+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, automotive, and computing applications.

The MAX1725/MAX1726 product line was engineered specifically for ultra-low-power, battery-operated systems demanding extended operational life, robust fault protection, and minimal external components-targeting safety, sensing, and portable instrumentation markets.

FAQ

What is the maximum output current supported by the MAX1726EUK25+T?

The MAX1726EUK25+T guarantees 20mA output current across its full operating temperature range (-40°C to +85°C) and input voltage range (2.5V to 12V). While absolute maximum ratings allow 200mA continuous and indefinite short-circuit current (foldback-limited to ~40mA), sustained operation above 20mA may exceed thermal limits in the SOT23 package without adequate PCB copper area. Always verify junction temperature using θJA = 140°C/W.

Does the MAX1726EUK25+T require an external feedback resistor network?

No, the MAX1726EUK25+T does not require external feedback resistors. It uses an internal resistor divider to set the fixed 2.5V output, unlike the adjustable MAX1725 which requires external R1/R2 on the FB pin. This simplifies design, reduces component count, and improves accuracy by eliminating resistor tolerance and temperature drift effects inherent in external networks.

What protection features are integrated into the MAX1726EUK25+T?

The MAX1726EUK25+T integrates three key protections: reverse-battery protection (limits reverse input current to <10µA when VIN < 0V), thermal shutdown (trips at +150°C with 15°C hysteresis), and foldback short-circuit limiting (caps output current at ~40mA during ground faults). These features eliminate the need for external diodes, fuses, or thermal sensors in most battery-powered applications.

Can the MAX1726EUK25+T operate from a single lithium-ion cell?

No, the MAX1726EUK25+T cannot reliably operate from a single Li+ cell. Its minimum input voltage is +2.5V, while a discharged single Li+ cell falls to ~2.7V nominal and can drop below 2.5V under load. The device is specified for two Li+ cells (3.0V–8.4V) or 9V batteries. For single-cell applications, consider regulators with lower VIN(min), such as the MAX1722 (0.7V start-up) or TPS78225 (2.2V min).

What is the recommended output capacitor for the MAX1726EUK25+T?

The MAX1726EUK25+T is stable with a minimum 1µF ceramic capacitor (X5R or X7R dielectric) placed directly between OUT and GND. Larger values (e.g., 2.2µF–10µF) improve load-transient response and PSRR at high frequencies but are not required for stability. Avoid electrolytic or tantalum capacitors due to higher ESR, which may degrade transient performance and cause instability.