Analog Devices Inc./Maxim Integrated MAX8875EUK27+T

Overview

MAX8875EUK27+T from Maxim Integrated is a 2.7V 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 over temperature, and is optimized for battery-powered portable electronics requiring stable low-noise voltage rails.

For engineers reviewing the MAX8875EUK27+T datasheet, MAX8875EUK27+T pinout, MAX8875EUK27+T application, or MAX8875EUK27+T equivalent, key selection criteria include dropout performance at 110mV @100mA, reverse-battery protection, thermal shutdown at +170°C, and compatibility with 1µF ceramic output capacitors - all validated for PCS phones, modems, and palmtop computers.

Technical Context

The MAX8875EUK27+T implements a bandgap-referenced error amplifier driving a 1.1Ω typical P-channel MOSFET pass transistor, enabling load-independent quiescent current and eliminating base-drive losses inherent in PNP-based LDOs. Its internal feedback divider sets the 2.7V output without external resistors.

Power-OK monitoring uses an open-drain comparator referenced to 95% of nominal VOUT (2.565V threshold), with hysteresis and activation down to VIN ≤1V for power-on-reset functionality. Shutdown logic reduces supply current to ≤1µA, and thermal protection cycles the output during sustained overload via +170°C trip with +20°C hysteresis.

Key Specifications

Pinout & Package

MAX8875EUK27+T is housed in a 5-pin SOT23-5 package with exposed pad for thermal enhancement. The GND pin serves dual electrical and thermal functions and must be soldered to a large PCB copper area for reliable 150mA operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX8885EUK27+T and MCP1700T-2702E/TT, the MAX8875EUK27+T uniquely combines ultra-low 85µA IQ, integrated POK with POR capability, reverse-battery protection, and thermal cycling - making it the only option among the three qualified for safety-critical portable telecom subsystems demanding full fault coverage.

Availability

MAX8875EUK27+T is available at Aetrix Electronics and suitable for PCS telephones, cellular telephones, and palmtop computers requiring stable component supply, long-lifecycle support, and guaranteed parametric compliance across industrial temperature range (-40°C to +85°C).

Supply support for MAX8875EUK27+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, communications, and consumer applications.

The MAX8875 series was engineered specifically for battery-powered portable equipment - delivering ultra-low quiescent current, robust fault protection, and minimal external components to maximize runtime and reliability in space-constrained handheld devices.

FAQ

What is the minimum input voltage required for MAX8875EUK27+T to maintain regulation?

The MAX8875EUK27+T requires VIN ≥ VOUT + dropout voltage. With a typical dropout of 110mV at 100mA, the minimum functional input is 2.81V. At 150mA, dropout rises to 165mV, so VIN must be ≥2.865V. Below these thresholds, the POK output asserts low, indicating out-of-regulation operation.

Does MAX8875EUK27+T require an external pull-up resistor on the POK pin?

Yes, MAX8875EUK27+T features an open-drain POK output and requires an external pull-up resistor to generate a logic-high signal when regulation is valid. A 100kΩ resistor to OUT is recommended per the datasheet; larger values reduce current draw but may slow rise time in noisy environments.

Can MAX8875EUK27+T operate with a 10µF output capacitor instead of the specified 1µF?

Yes, MAX8875EUK27+T remains stable with 10µF ceramic or tantalum output capacitors. Larger values improve PSRR, reduce output noise (170µVRMS), and enhance load-transient response - though 1µF is the minimum required for guaranteed stability across temperature and load conditions.

What protection features are integrated into MAX8875EUK27+T?

MAX8875EUK27+T integrates four key protections: (1) thermal shutdown at +170°C with +20°C hysteresis, (2) short-circuit protection allowing indefinite ground faults, (3) reverse-battery protection limiting reverse current to ≤1mA, and (4) current limiting with 390mA typical trip level - all implemented without external components.

Is MAX8875EUK27+T compatible with ceramic capacitors having Z5U or Y5V dielectrics?

No - Z5U and Y5V ceramics exhibit large capacitance and ESR shifts at low temperatures, risking instability. The MAX8875EUK27+T datasheet specifies X7R or X5R dielectrics for the 1µF output capacitor to ensure stable operation across -40°C to +85°C; use ≥2× capacitance if Z5U/Y5V must be used.