Analog Devices Inc./Maxim Integrated MAX8887EZK25+

Overview

MAX8887EZK25+ from Maxim Integrated is a low-noise, 2.5V fixed-output, 300mA low-dropout linear regulator with 100mV dropout at 200mA, 55µA no-load supply current, and 42µVRMS output noise. It features an internal PMOS pass transistor, thermal shutdown, short-circuit protection, and micropower shutdown mode (0.1µA), designed for power-sensitive portable applications including cellular phones and PDAs.

For engineers reviewing the MAX8887EZK25+ datasheet, MAX8887EZK25+ pinout, MAX8887EZK25+ application, or MAX8887EZK25+ equivalent, key selection criteria include guaranteed 300mA continuous output, ultra-low quiescent current independent of load, preset 2.5V output, SOT23-5 package compatibility, and low-noise performance critical for RF and analog subsystems.

Technical Context

The MAX8887EZK25+ employs a p-channel MOSFET pass transistor with ~0.5Ω R_DS(ON), eliminating base-drive current and enabling stable 55µA ground-pin current across 0–300mA load range. Its error amplifier compares feedback from an internal 1.25V reference to regulate output precisely at 2.5V ±2% over temperature and line variations.

Noise reduction is achieved via the BP (bypass) pin, which accepts a 0.01µF ceramic capacitor to filter reference noise-enabling 42µVRMS integrated output noise (10Hz–100kHz). Unlike the MAX8888 variant, it omits the POK output, prioritizing low-noise operation over power-good monitoring.

Key Specifications

Pinout & Package

MAX8887EZK25+ is housed in a RoHS-compliant, thin-profile 5-pin SOT23 package (1mm height), optimized for space-constrained portable PCB layouts. Pin assignments are validated per Maxim's official pin configuration diagram for MAX8887.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6206P252MR and ADP160ACBZ-2.5-R7, the MAX8887EZK25+ uniquely combines 300mA drive, 100mV dropout, 42µVRMS noise (via BP), and thermal protection in a standard SOT23-5-making it the only option for noise-sensitive, high-current portable subsystems requiring robust fault handling.

Availability

MAX8887EZK25+ is available at Aetrix Electronics and suitable for cellular phones, digital cameras, wireless handsets, and PCMCIA interface designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX8887EZK25+ 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 MAX8887EZK25+ belongs to Maxim's low-dropout linear regulator product line, engineered specifically for battery-powered portable electronics demanding ultra-low noise, minimal quiescent current, and reliable thermal/overcurrent protection in miniature packages.

FAQ

What is the exact output voltage tolerance of the MAX8887EZK25+ over temperature?

The MAX8887EZK25+ delivers 2.5V output with ±2% accuracy across the full operating temperature range of -40°C to +85°C, as specified in the Electrical Characteristics table under "Output Voltage Accuracy" with I_OUT = 100µA to 300mA. This tolerance includes initial calibration, line regulation, and temperature drift-ensuring consistent rail integrity for 2.5V logic and analog interfaces without external trimming.

Does the MAX8887EZK25+ require an external capacitor on the BP pin, and why?

Yes, the MAX8887EZK25+ requires a 0.01µF low-leakage ceramic capacitor between the BP pin and GND to achieve its specified 42µVRMS output noise. This capacitor forms a low-pass filter on the internal 1.25V reference, suppressing high-frequency noise that would otherwise modulate the error amplifier. Omitting it degrades noise performance significantly-verified in the Typical Operating Characteristics (Figure toc10).

Can the MAX8887EZK25+ be used with input voltages below 2.5V?

No-the MAX8887EZK25+ has a minimum input voltage of 2.5V per Absolute Maximum Ratings and Electrical Characteristics. Input undervoltage lockout activates below ~2.4V (rising), disabling regulation. Attempting operation below 2.5V risks unregulated output, increased dropout, or failure to start; it is not rated for sub-2.5V operation even in dropout condition.

How does the MAX8887EZK25+ handle short-circuit conditions?

The MAX8887EZK25+ employs foldback current limiting: under short-circuit, output current is reduced to ~420mA (typical) when V_OUT falls below 93% of 2.5V, then further limited to 300mA continuous. Combined with thermal shutdown at +170°C (20°C hysteresis), this prevents destructive power dissipation. The device cycles on/off during sustained shorts-verified in Thermal Protection and Current Limit sections of the datasheet.

Is the MAX8887EZK25+ pin-compatible with the MAX8888 series?

No-while both share the same SOT23-5 package footprint, the MAX8887EZK25+ uses Pin 4 as BP (bypass), whereas the MAX8888 uses Pin 4 as POK (power-ok). Swapping them without PCB revision causes functional failure: connecting POK to BP misroutes the reference bypass path and disables noise reduction. They are functionally distinct variants, not pin-compatible replacements.