Analog Devices Inc./Maxim Integrated MAX1726EUK50+T

Overview

MAX1726EUK50+T from Maxim Integrated is a fixed-output, ultra-low quiescent current (2µA), low-dropout linear regulator delivering 5.0V at up to 20mA with ±1.5% output voltage accuracy over -40°C to +85°C. It features reverse-battery protection, thermal shutdown, short-circuit foldback limiting, and operates from 2.5V to 12V input-ideal for smoke detector backup power and real-time clock supply in battery-constrained systems.

For engineers reviewing the MAX1726EUK50+T datasheet, MAX1726EUK50+T pinout, MAX1726EUK50+T application, or MAX1726EUK50+T equivalent, key selection criteria include guaranteed 20mA output under ultra-low IQ, 1µF output capacitor support, SOT23-5 package compatibility, and factory-trimmed 5.0V output without external feedback components.

Technical Context

The MAX1726EUK50+T uses an internal p-channel MOSFET pass transistor with a 1.245V reference error amplifier, enabling stable regulation without external resistors. Its architecture eliminates base-drive current loss inherent in PNP-based LDOs, sustaining 2µA supply current across full load (1mA–20mA) and dropout conditions.

Shutdown logic activates below 0.5V on SHDN, reducing supply current to 0.7µA while disconnecting OUT. Thermal protection triggers at +150°C junction temperature with 15°C hysteresis, and reverse-battery protection limits VIN < 0V leakage to <10µA when SHDN is driven via 100kΩ resistor.

Key Specifications

Pinout & Package

MAX1726EUK50+T is housed in a RoHS-compliant 5-pin SOT23 package (package code U5+1, outline 21-0057), with 1.3mm × 2.9mm footprint and 0.95mm height. Pin 4 is internally connected to GND (dual-GND configuration).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700T-5002E/TT and TCS2065-5.0, the MAX1726EUK50+T uniquely combines 2µA IQ, integrated reverse-battery protection, thermal hysteresis, and dual-GND SOT23-5 packaging-making it optimal for safety-critical, field-deployed battery systems where reliability trumps minimal pin count.

Availability

MAX1726EUK50+T is available at Aetrix Electronics and suitable for smoke detectors, remote transmitters, and real-time clock backup power systems requiring stable component supply, long-lifecycle assurance, and RoHS-compliant sourcing.

Supply support for MAX1726EUK50+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) designs precision analog, mixed-signal, and power-management ICs for industrial, medical, communications, and consumer applications.

The MAX1725/MAX1726 product line delivers ultra-low-IQ LDOs optimized for battery longevity in safety-critical, maintenance-free equipment such as fire alarms, portable instrumentation, and smart energy meters.

FAQ

What is the maximum input voltage rating for MAX1726EUK50+T?

The MAX1726EUK50+T has an absolute maximum input voltage of +14V referenced to GND. However, its operational input range is specified from +2.5V to +12V. Exceeding +12V may cause excessive power dissipation or thermal shutdown, and sustained operation above +12V is not recommended per the datasheet's Electrical Characteristics table.

Does MAX1726EUK50+T require an external feedback resistor network?

No, the MAX1726EUK50+T does not require external feedback resistors. It is a factory-preset 5.0V regulator with internal resistor divider and 1.245V reference. Unlike the adjustable MAX1725, the MAX1726EUK50+T uses dedicated internal feedback, eliminating BOM items and layout overhead while ensuring ±1.5% output accuracy across temperature.

Can MAX1726EUK50+T be used with a 1µF output capacitor?

Yes, the MAX1726EUK50+T is fully stable with a 1µF ceramic output capacitor, as confirmed in the General Description and Applications Information sections. This value ensures adequate phase margin across -40°C to +85°C and supports fast load-transient response-critical for microcontroller wake-up events and sensor sampling bursts.

What protection features are integrated into MAX1726EUK50+T?

The MAX1726EUK50+T integrates reverse-battery protection (<10µA leakage at VIN < 0V), thermal shutdown (+150°C trip with 15°C hysteresis), and foldback current limiting (~40mA short-circuit current). These protections operate autonomously without external components, making MAX1726EUK50+T suitable for unattended, safety-regulated applications like smoke detectors and industrial sensors.

Is MAX1726EUK50+T pin-compatible with other SOT23-5 LDOs?

MAX1726EUK50+T uses a standard 5-pin SOT23 footprint (outline 21-0057), but its pinout-specifically dual-GND (Pins 2 and 4) and SHDN on Pin 5-is not universally shared. While physical mounting is compatible, electrical pin mapping differs from many 3-pin or single-GND SOT23 LDOs. Always verify pin function alignment before substitution; direct replacement requires matching IN/GND/OUT/SHDN/FB or GND assignments.