Analog Devices Inc./Maxim Integrated MAX8875EUK30+

Overview

MAX8875EUK30+ from Maxim Integrated is a 3.0V 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-power voltage regulation.

For engineers reviewing the MAX8875EUK30+ datasheet, MAX8875EUK30+ pinout, MAX8875EUK30+ application, or MAX8875EUK30+ equivalent, key selection considerations include dropout voltage (110mV at 100mA), reverse-battery protection, thermal shutdown at +170°C, and compatibility with 1µF ceramic output capacitors for VOUT ≥2.5V.

Technical Context

The MAX8875EUK30+ employs an internal 1.25V bandgap reference and error amplifier driving a 1.1Ω (typ) P-channel MOSFET pass transistor - eliminating base-drive current and enabling load-independent 85µA quiescent supply current. Its POK output activates when VOUT falls >1% below nominal due to dropout, overload, or thermal shutdown.

Regulation relies on an internal resistor divider setting fixed 3.0V output; shutdown logic disables the pass transistor when SHDN is pulled low, reducing supply current to ≤1µA. Thermal protection includes 20°C hysteresis, enabling pulsed operation under sustained overload without damage.

Key Specifications

Pinout & Package

Package: 5-pin SOT23-5 (top-marked ADLB), thermally enhanced with GND pin serving as heatsink. Requires soldering to large copper area for thermal management.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX8885EUK30+, the MAX8875EUK30+ delivers 40µA lower quiescent current and tighter output accuracy but requires low-ESR ceramic capacitors; versus MCP1700T-3002E/MB, it adds critical POK monitoring and shutdown control at the cost of higher IQ and larger package.

Availability

MAX8875EUK30+ is available at Aetrix Electronics and suitable for PCS telephones, cellular handsets, and cordless telephone base stations requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance across industrial temperature ranges.

Supply support for MAX8875EUK30+ 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 product line targets battery-powered portable equipment - delivering ultra-low IQ, robust protection features, and small-footprint packaging for space-constrained handheld devices.

FAQ

What is the minimum input voltage required for MAX8875EUK30+ to maintain 3.0V regulation at 100mA load?

The MAX8875EUK30+ requires a minimum input voltage of 3.11V to maintain regulation at 100mA load, based on its typical 110mV dropout voltage (VIN – VOUT). This value is confirmed in the Electrical Characteristics table and Typical Operating Characteristics graph "Dropout Voltage vs. Output Load" for the MAX8875EUK30+ variant.

Does MAX8875EUK30+ support ceramic output capacitors, and what is the minimum recommended value?

Yes, MAX8875EUK30+ is optimized for 1µF ceramic output capacitors with ESR <0.2Ω for VOUT ≥2.5V. The datasheet explicitly states this value ensures stability across -40°C to +85°C and up to 150mA load. X7R or X5R dielectrics are recommended; Z5U/Y5V may require derating at low temperatures.

How does the POK output of MAX8875EUK30+ behave during shutdown?

The POK output of MAX8875EUK30+ is inactive during shutdown - it does not assert or monitor regulation status when SHDN is pulled low. The datasheet confirms "the POK function is not active during shutdown," meaning POK remains high-impedance (open-drain) and cannot be used for reset generation in shutdown mode.

What thermal protection behavior does MAX8875EUK30+ exhibit under continuous overload?

Under continuous thermal overload, MAX8875EUK30+ enters pulsed operation: it shuts down at +170°C junction temperature and re-enables only after cooling by 20°C (hysteresis). This cycling prevents permanent damage but is not intended for sustained operation; design must ensure average power dissipation stays within θJA-limited limits.

Can MAX8875EUK30+ be used with a 1.5V output configuration?

No, MAX8875EUK30+ is factory-set to 3.0V output only, as indicated by the "30" suffix in its part number per the Output Voltage Selector Guide. For 1.5V output, the correct variant is MAX8875EUK15-T (top-mark ADQI), which uses a different internal feedback divider and specifies 3.3µF output capacitance.