Analog Devices Inc./Maxim Integrated MAX8867EZK28+T

Overview

MAX8867EZK28+T from Maxim Integrated is a low-noise, low-dropout linear regulator with a factory-preset 2.8V output, 150mA output current capability, 30µVRMS output noise, and 165mV dropout at full load. It uses an internal P-channel MOSFET pass transistor and operates from 2.5V to 6.5V input, targeting battery-powered portable electronics requiring stable, quiet voltage regulation.

For engineers reviewing the MAX8867EZK28+T datasheet, MAX8867EZK28+T pinout, MAX8867EZK28+T application, or MAX8867EZK28+T equivalent, key selection criteria include guaranteed ±1.4% output accuracy over temperature, 10nA shutdown current, reverse battery protection, thermal shutdown at +155°C, and compatibility with 1µF ceramic output capacitors for stability across -40°C to +85°C.

Technical Context

The MAX8867EZK28+T implements a fixed-output LDO architecture with a 1.25V bandgap reference, error amplifier, and internal resistor divider - eliminating external feedback components. Its P-channel MOSFET pass element enables ultra-low quiescent current (100µA) independent of load or dropout condition.

It integrates BP-pin-based noise filtering (via 0.01µF capacitor), logic-controlled shutdown with auto-discharge only on MAX8868 variants (not applicable here), thermal overload protection with 20°C hysteresis, and reverse-battery protection limiting reverse current to 1mA - all in a thin SOT23-5 package optimized for space-constrained handheld devices.

Key Specifications

Pinout & Package

MAX8867EZK28+T is housed in a thin 5-pin SOT23 package (JEDEC MO-178AA), with exposed pad not electrically connected. The GND pin serves as both circuit return and thermal path - requires soldering to a PCB ground plane for optimal thermal performance and power dissipation up to 727mW at +70°C ambient.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX8867EUK28-T, the MAX8867EZK28+T offers higher thermal performance in constrained spaces; versus MCP1700T-2802E/TT, it trades ultra-low quiescent current for significantly lower noise and integrated safety features essential in battery-reversal-prone consumer devices.

Availability

MAX8867EZK28+T is available at Aetrix Electronics and suitable for cellular handsets, PCMCIA cards, palmtop computers, and electronic planners requiring stable component supply with guaranteed long-term manufacturability and consistent parametric performance.

Supply support for MAX8867EZK28+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) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and consumer applications.

The MAX8867/MAX8868 product line was designed specifically for space- and power-constrained portable electronics, delivering ultra-low noise and dropout in minimal SOT23 footprints while integrating robust protection features for unattended battery operation.

FAQ

What is the output voltage tolerance of the MAX8867EZK28+T over temperature?

The MAX8867EZK28+T guarantees ±1.4% output voltage accuracy across its full operating temperature range of -40°C to +85°C. This specification is production-tested at +25°C and correlated over temperature using Statistical Quality Control methods - ensuring predictable rail stability in handheld and portable equipment without trimming or calibration.

Does the MAX8867EZK28+T include auto-discharge functionality during shutdown?

No, the MAX8867EZK28+T does not include auto-discharge. That feature is exclusive to the MAX8868 family (e.g., MAX8868EZK28+T). The MAX8867EZK28+T enters 10nA shutdown mode upon SHDN assertion but leaves the output floating; external discharge circuitry is required if rapid VOUT decay is needed.

What output capacitor value is required for stable operation of the MAX8867EZK28+T?

A minimum 1µF X7R or X5R ceramic capacitor is required on the OUT pin for stable operation across -40°C to +85°C and up to 150mA load. Larger values (e.g., 10µF) improve PSRR and load-transient response, but 1µF is sufficient for stability - unlike Z5U/Y5V dielectrics, which may require ≥2.2µF at low temperatures.

Can the MAX8867EZK28+T operate from a 2.5V input while delivering 2.8V output?

No. The MAX8867EZK28+T cannot regulate 2.8V output from a 2.5V input because its minimum dropout voltage is 55mV at 50mA and 165mV at 150mA. To maintain regulation, VIN must be ≥2.855V (2.8V + 55mV) minimum - making it unsuitable for sub-2.85V sources despite its 2.5V absolute minimum input rating.

Is reverse battery protection active on the MAX8867EZK28+T, and how does it behave?

Yes, reverse battery protection is fully active on the MAX8867EZK28+T. When VIN or SHDN falls below GND, internal circuitry disconnects parasitic paths and limits reverse current to ≤1mA - preventing damage during incorrect battery insertion. This behavior is inherent to the MAX8867 design and requires no external components.