Analog Devices Inc./Maxim Integrated MAX8885EUK30+T

Overview

MAX8885EUK30+T from Maxim Integrated is a 3.0V fixed-output, 150mA low-dropout linear regulator with P-channel MOSFET pass element, 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 is optimized for use with 4.7µF tantalum capacitors in portable battery-powered systems.

For engineers reviewing the MAX8885EUK30+T datasheet, MAX8885EUK30+T pinout, MAX8885EUK30+T application, or MAX8885EUK30+T equivalent, key selection criteria include dropout voltage at 100mA (110mV), thermal shutdown at +170°C, reverse-battery protection, 1µA max shutdown current, and compatibility with high-ESR output capacitors - critical for cost-sensitive PCS/cellular phone power rails.

Technical Context

The MAX8885EUK30+T implements a 1.25V bandgap reference and error amplifier driving an internal P-channel MOSFET pass transistor (R_DS(ON) ≈ 1.1Ω). Its feedback network is fully integrated, setting V_OUT = 3.0V via factory-trimmed resistors. The POK comparator monitors V_OUT against a -5.3% threshold relative to nominal output and asserts low when regulation is lost due to dropout, overcurrent, or thermal shutdown.

Shutdown logic disables the pass transistor and reduces ground current to ≤1µA; reverse-battery protection limits reverse current to 1mA when VIN or SHDN falls below GND. Thermal protection activates at +170°C with 20°C hysteresis, enabling pulsed operation under sustained overload without damage.

Key Specifications

Pinout & Package

MAX8885EUK30+T is housed in a 5-pin SOT23-5 package (JEDEC MO-178AA), with GND serving dual electrical and thermal functions. The package requires soldering to a large copper pad or ground plane for effective heat dissipation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO regulator applications.

Compared with MIC5206-3.0YM5-TR, MAX8885EUK30+T offers lower quiescent current and built-in reverse-battery protection; compared with MAX8875EUK30+T, it trades ceramic compatibility for robustness with low-cost tantalum capacitors - a decisive factor in cost-driven portable designs.

Availability

MAX8885EUK30+T is available at Aetrix Electronics and suitable for PCS phones, cellular handsets, and hand-held instruments requiring stable component supply, long-lifecycle support, and guaranteed parametric compliance over -40°C to +85°C.

Supply support for MAX8885EUK30+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 MAX8885 series was developed specifically for cost-sensitive, battery-powered portable electronics requiring ultra-low quiescent current, high-ESR capacitor compatibility, and integrated power-good monitoring - targeting PCS, cellular, and palmtop platforms.

FAQ

What is the maximum input voltage rating for the MAX8885EUK30+T?

The MAX8885EUK30+T has an absolute maximum input voltage of +7V referenced to GND, but its specified operating range is +2.5V to +6.5V. Exceeding +6.5V may cause excessive power dissipation or violate thermal limits, especially at high output currents. Always observe the recommended input range to ensure reliability and parametric compliance across temperature.

Does the MAX8885EUK30+T require an external capacitor on the POK pin?

No, the MAX8885EUK30+T does not require an external capacitor on the POK pin for basic operation. However, adding a small capacitor (e.g., 10nF) from POK to GND can generate a controlled power-on-reset (POR) delay, useful for synchronizing microcontroller startup. The POK output is open-drain and must be pulled up externally - typically with a 100kΩ resistor to OUT - to produce a valid logic-high level.

Can the MAX8885EUK30+T be used with ceramic output capacitors?

No, the MAX8885EUK30+T is explicitly designed for high-ESR tantalum capacitors (≥0.5Ω) and becomes unstable with low-ESR ceramic capacitors. Using ceramic output caps risks oscillation and loss of regulation. For ceramic-compatible operation, select the pin-compatible MAX8875EUK30+T instead - it shares the same 3.0V output and POK functionality but employs different internal compensation.

What is the dropout voltage of the MAX8885EUK30+T at 150mA load?

The MAX8885EUK30+T has a guaranteed maximum dropout voltage of 165mV at 150mA load and +25°C. This means it maintains regulation as long as VIN remains ≥ 3.165V. Dropout increases slightly at temperature extremes: typical values are 150mV at -40°C and 175mV at +85°C under identical load conditions, per characterization data in the datasheet.

How does reverse-battery protection work in the MAX8885EUK30+T?

The MAX8885EUK30+T incorporates dedicated circuitry that monitors polarity on both IN and SHDN pins. If either pin falls below GND, internal switches disconnect parasitic paths and limit reverse current to ≤1mA - preventing damage to the IC and downstream components. This feature operates independently of regulator state and remains active even during shutdown, making it ideal for user-serviceable battery compartments.