Analog Devices Inc./Maxim Integrated MAX8875EUK50+

Overview

MAX8875EUK50+ from Maxim Integrated is a 5.0V 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 - designed for battery-powered portable electronics requiring stable voltage under light-to-moderate load and tight input voltage headroom.

For engineers reviewing the MAX8875EUK50+ datasheet, MAX8875EUK50+ pinout, MAX8875EUK50+ application, or MAX8875EUK50+ equivalent, key selection criteria include dropout performance at 100mA (110mV), ±1% output accuracy over temperature, reverse-battery protection, thermal shutdown at +170°C, and compatibility with 1µF ceramic output capacitors.

Technical Context

The MAX8875EUK50+ employs an internal 1.25V bandgap reference and error amplifier to regulate output via feedback from a factory-trimmed resistor divider. Its P-channel MOSFET pass transistor (typ. R_DS(ON) = 1.1Ω) eliminates base-drive current, enabling load-independent 85µA ground current across 0–150mA output range.

Power-OK monitoring is implemented with an open-drain comparator referenced to 95% of nominal V_OUT, asserting low when V_OUT drops below threshold due to dropout, overload, or thermal shutdown. Shutdown logic disables regulation while limiting supply current to ≤1µA, and reverse-battery protection clamps reverse current to ≤1mA at IN or SHDN pins.

Key Specifications

Pinout & Package

MAX8875EUK50+ is housed in a 5-pin SOT23-5 package (JEDEC MO-178AA), with GND pin serving dual electrical and thermal functions - requires soldering to ≥25 mm² copper pad for rated 150mA operation at +85°C ambient.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX8875EUK50+, the MAX8885EUK50+ offers identical pinout and regulation but trades slightly higher quiescent current for broader capacitor compatibility, while the MCP1700T-5002E/MB sacrifices POK functionality and package pin count to achieve sub-5µA IQ - making MAX8875EUK50+ the optimal balance of monitoring, protection, and efficiency for portable 5V systems.

Availability

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

Supply support for MAX8875EUK50+ 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 developed specifically for battery-powered portable equipment - emphasizing ultra-low quiescent current, small footprint, and integrated protection features like reverse-battery and thermal shutdown.

FAQ

What is the minimum input voltage required for MAX8875EUK50+ to maintain regulation at full 150mA load?

The MAX8875EUK50+ requires VIN ≥ 5.165V to sustain 5.0V output at 150mA, based on its maximum dropout voltage of 165mV under that condition. Below this threshold, the device enters dropout and VOUT declines linearly with VIN. This specification is verified across -40°C to +85°C and applies to the MAX8875EUK50+ variant with 5.0V preset output.

Does MAX8875EUK50+ require an external pull-up resistor on the POK pin, and what value is recommended?

Yes, MAX8875EUK50+ requires an external pull-up resistor on the POK pin because it is an open-drain output. A 100kΩ resistor connected from POK to OUT is recommended per Maxim's typical operating circuit - this provides sufficient logic-high level while minimizing current draw during normal operation. The MAX8875EUK50+ POK output sinks current only when VOUT falls below 4.75V.

Can MAX8875EUK50+ be used with a 10µF aluminum electrolytic output capacitor instead of ceramic?

No - MAX8875EUK50+ is optimized for low-ESR ceramic capacitors (≤0.2Ω) and becomes unstable with high-ESR types like standard aluminum electrolytics. Using a 10µF electrolytic may cause oscillation or poor transient response. For higher-ESR capacitors, Maxim specifies the pin-compatible MAX8885EUK50+ as the functional alternative, not the MAX8875EUK50+.

What protection features are integrated into MAX8875EUK50+ and how do they operate?

MAX8875EUK50+ integrates reverse-battery protection (limits reverse current to ≤1mA), thermal shutdown (+170°C trip with 20°C hysteresis), short-circuit protection (indefinite output short survival), and current limiting (390mA typical). These operate autonomously without external components - for example, reverse-battery protection disconnects internal circuitry when IN or SHDN goes negative relative to GND, safeguarding the MAX8875EUK50+ during incorrect battery installation.

Is MAX8875EUK50+ compatible with X7R ceramic output capacitors, and what is the minimum required value?

Yes, MAX8875EUK50+ is fully compatible with X7R dielectric ceramic capacitors, which maintain stable capacitance and low ESR across temperature. The minimum required value is 1µF (with ESR < 0.2Ω) for VOUT ≥ 2.5V - satisfying this requirement ensures stability across -40°C to +85°C. This specification is explicitly validated for the MAX8875EUK50+ in Maxim's Applications Information section.