Analog Devices Inc./Maxim Integrated MAX8875EUK50+T

Overview

MAX8875EUK50+T from Maxim Integrated is a 5.0V, 150mA low-dropout linear regulator with P-channel MOSFET pass device, 85µA no-load supply current, and active-low open-drain Power-OK (POK) output. It operates from +2.5V to +6.5V input, delivers ±1% output accuracy, and supports battery-powered portable electronics requiring stable low-quiescent-power regulation.

For engineers reviewing the MAX8875EUK50+T datasheet, MAX8875EUK50+T pinout, MAX8875EUK50+T application, or MAX8875EUK50+T equivalent, key selection criteria include dropout voltage at 100mA (110mV), shutdown current ≤1µA, reverse-battery protection, thermal shutdown at +170°C, and compatibility with 1µF ceramic output capacitors.

Technical Context

The MAX8875EUK50+T uses an internal 1.25V bandgap reference and error amplifier to regulate output via a 1.1Ω (typ) P-channel MOSFET pass transistor - eliminating base-drive current and enabling load-independent quiescent current. Its POK comparator monitors VOUT against a hysteresis-controlled threshold (±1% at VOUT ≥2.5V) and asserts low when output falls >5.3% below nominal during dropout, overload, or thermal shutdown.

Shutdown logic disables regulation while maintaining <1µA supply current; reverse-battery protection limits reverse current to 1mA if VIN or SHDN falls below GND. Thermal protection cycles the pass transistor on/off with 20°C hysteresis above +170°C junction temperature, and current limiting caps output at 160mA (min) to 600mA (max).

Key Specifications

Pinout & Package

SOT23-5 package: miniature 5-pin surface-mount outline with exposed pad for thermal conduction; GND pin serves dual role as electrical ground and heatsink - requires soldering to large copper area for rated power dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX8885EUK50+T and TPS76350DBVR, the MAX8875EUK50+T uniquely combines ultra-low 85µA quiescent current, integrated POK, reverse-battery protection, and guaranteed stability with 1µF ceramic output capacitors - making it optimal for space- and battery-life-constrained portable designs where all three features are required.

Availability

MAX8875EUK50+T is available at Aetrix Electronics and suitable for cellular telephones, PCS handsets, and modem data cards requiring stable component supply, long-term lifecycle support, and guaranteed parametric compliance across industrial temperature range.

Supply support for MAX8875EUK50+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 demanding industrial, automotive, and communications applications.

The MAX8875 series targets battery-powered portable equipment - delivering high accuracy, ultra-low quiescent current, and integrated protection features in ultra-small SOT23-5 packages for space-constrained handheld devices.

FAQ

What is the minimum input voltage required for MAX8875EUK50+T to maintain regulation?

The MAX8875EUK50+T requires VIN ≥ VOUT + dropout voltage. At 100mA load, dropout is 110mV, so minimum VIN = 5.11V. At 150mA, dropout rises to 165mV, requiring VIN ≥ 5.165V. Input must stay within +2.5V to +6.5V absolute ratings - operation below 5.0V output is not supported for this 5.0V variant.

Does MAX8875EUK50+T require an external pull-up resistor on the POK pin?

Yes, MAX8875EUK50+T POK is an open-drain N-channel MOSFET output and requires an external pull-up resistor to generate a valid logic-high level. A 100kΩ resistor to OUT is recommended per datasheet; values up to 1MΩ may be used to minimize current draw, provided rise time meets system timing requirements.

Can MAX8875EUK50+T be used with a 10µF output capacitor?

Yes, MAX8875EUK50+T remains stable with 10µF ceramic or tantalum output capacitors. While 1µF is the minimum for stability, larger values improve PSRR, reduce output noise, and enhance load-transient response - especially beneficial in noise-sensitive RF or audio subsystems powered by MAX8875EUK50+T.

What protection features are integrated into MAX8875EUK50+T?

MAX8875EUK50+T integrates four protection functions: (1) thermal shutdown at +170°C with 20°C hysteresis, (2) short-circuit protection with indefinite output short duration, (3) reverse-battery protection limiting reverse current to 1mA, and (4) current limiting with 160mA minimum trip threshold - all operating without external components.

Is MAX8875EUK50+T compatible with X7R ceramic capacitors?

Yes, MAX8875EUK50+T is fully compatible with X7R dielectric ceramic capacitors. The datasheet specifies 1µF X7R (ESR <0.2Ω) as the minimum stable output capacitor for VOUT ≥2.5V - including the 5.0V MAX8875EUK50+T - across the full -40°C to +85°C operating range.