Analog Devices Inc./Maxim Integrated MAX8875EUK25

Overview

MAX8875EUK25 from Maxim Integrated is a 2.5V fixed-output, 150mA low-dropout linear regulator with P-channel MOSFET pass element, 85µA no-load quiescent current, and active-low open-drain Power-OK (POK) output. It operates from +2.5V to +6.5V input, delivers ±1% output accuracy, and is optimized for battery-powered portable devices requiring stable low-voltage rail generation under light-to-moderate load.

For engineers reviewing the MAX8875EUK25 datasheet, MAX8875EUK25 pinout, MAX8875EUK25 application, or MAX8875EUK25 equivalent, key selection criteria include dropout voltage at 150mA (165mV), reverse-battery protection, thermal shutdown at 170°C, 1µF ceramic capacitor stability, and SOT23-5 package compatibility in space-constrained designs.

Technical Context

The MAX8875EUK25 implements a bandgap-referenced error amplifier driving an internal 1.1Ω P-channel MOSFET pass transistor, enabling load-independent quiescent current and low dropout. Its feedback network is fully internal - no external resistors required - with factory-trimmed 2.5V output set via laser trimming.

Power-OK monitoring uses a dedicated comparator comparing VOUT against a threshold derived from the 1.25V reference; POK asserts low when VOUT drops >5.3% below nominal during dropout, overcurrent, or thermal shutdown. Shutdown logic disables regulation while maintaining <1µA supply current, with SHDN pin compatible with standard CMOS logic levels.

Key Specifications

Pinout & Package

MAX8875EUK25 is housed in a 5-pin SOT23-5 surface-mount package with exposed pad not electrically connected. GND pin serves dual role as circuit ground and primary thermal path; requires soldering to ≥100mm² copper area for rated power dissipation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-dropout regulator applications.

Compared with MAX8885EUK25 and MCP1700T-2502E/MB, the MAX8875EUK25 uniquely balances ultra-low quiescent current (85µA), integrated power monitoring (POK), and minimal 1µF ceramic stability - making it optimal for compact, battery-sensitive systems requiring both efficiency and system-level fault awareness.

Availability

MAX8875EUK25 is available at Aetrix Electronics and suitable for PCS telephones, palmtop computers, electronic planners, and PCMCIA cards requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance across -40°C to +85°C.

Supply support for MAX8875EUK25 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 demanding industrial, automotive, and portable applications.

The MAX8875 product line targets battery-operated portable equipment - delivering ultra-low IQ, small-footprint LDOs with integrated protection and status signaling for space- and energy-constrained designs.

FAQ

What is the minimum input voltage required for MAX8875EUK25 to maintain 2.5V output at 150mA load?

The MAX8875EUK25 requires a minimum input voltage of 2.665V to sustain regulation at 150mA, based on its specified 165mV dropout voltage (VIN – VOUT). Below this threshold, the output collapses linearly with input. This enables extended runtime from single-cell Li-ion batteries discharging down to ~2.7V under load.

Does MAX8875EUK25 require external feedback resistors to set its 2.5V output?

No, the MAX8875EUK25 has a factory-trimmed, fixed 2.5V output with no external feedback components required. The voltage divider is fully internal and laser-trimmed to ±1% accuracy across temperature. This eliminates resistor matching errors, reduces BOM count, and ensures consistent performance without layout sensitivity.

How does the POK pin on MAX8875EUK25 function during device shutdown?

The POK output on MAX8875EUK25 is inactive during shutdown - it neither asserts nor releases when SHDN is pulled low. POK only monitors regulation status during active operation and goes low only when VOUT falls >5.3% below 2.5V due to dropout, overcurrent, or thermal shutdown. This prevents false power-fail signals during intentional system sleep.

Can MAX8875EUK25 safely operate with a 10µF tantalum capacitor instead of the recommended 1µF ceramic?

While a 10µF tantalum capacitor may stabilize MAX8875EUK25 under some conditions, it is not guaranteed: the device is characterized and specified for stability with ≤0.2Ω ESR ceramics. Tantalum caps typically exceed this ESR, risking oscillation. For higher-ESR capacitors, use the pin-compatible MAX8885EUK25 instead.

What thermal design guidance applies to MAX8875EUK25 in SOT23-5 package at full 150mA load?

At 150mA and VIN = 5.0V, MAX8875EUK25 dissipates ~375mW. To hold junction temperature ≤150°C in +70°C ambient, the PCB must provide ≤213°C/W total thermal resistance (θJA). This requires soldering the GND pin to ≥100mm² of 2oz copper, with thermal vias to inner ground planes - per Maxim's SOT23-5 layout guidelines.