Analog Devices Inc./Maxim Integrated MAX8887EZK29+T

Overview

MAX8887EZK29+T from Maxim Integrated is a low-noise, 2.9V fixed-output, 300mA low-dropout linear regulator in SOT23-5 package, featuring 100mV dropout at 200mA, 42µVRMS output noise, and 55µA no-load supply current. It powers sensitive analog and RF circuitry in portable battery-powered systems such as cellular handsets and digital cameras where low noise and high efficiency are critical.

For engineers reviewing the MAX8887EZK29+T datasheet, MAX8887EZK29+T pinout, MAX8887EZK29+T application, or MAX8887EZK29+T equivalent, key selection considerations include its 2.9V preset output, BP pin for noise filtering, absence of POK output (distinguishing it from MAX8888 variants), thermal shutdown, and compatibility with 2.2µF ceramic input/output capacitors.

Technical Context

The MAX8887EZK29+T uses an internal p-channel MOSFET pass transistor with ~0.5Ω R_DS(ON), enabling ultra-low quiescent current independent of load and eliminating base-drive losses typical of PNP-based regulators. Its feedback loop references a stable 1.25V bandgap, scaled by factory-trimmed resistors to deliver precise 2.9V ±3% output accuracy across temperature and load.

Noise performance is enhanced via the BP (bypass) pin, which accepts a 0.01µF ceramic capacitor to filter reference noise - a feature exclusive to MAX8887-series devices. The regulator operates within 2.5V–5.5V input range and maintains regulation down to 100mV headroom at 200mA, supporting extended battery life in single-cell Li-ion and multi-cell alkaline systems.

Key Specifications

Pinout & Package

MAX8887EZK29+T is housed in a RoHS-compliant, lead-free 5-pin SOT23 package (1mm height), optimized for space-constrained portable designs. Thermal pad is not present; power dissipation relies on PCB copper area and θ_JA ≈ 220°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS78229DRVR and MCP1703T-2902E/MB, MAX8887EZK29+T uniquely balances 300mA drive, 42µV_RMS noise with BP filtering, and integrated thermal protection - making it optimal for battery-powered RF and imaging systems demanding both performance and robustness.

Availability

MAX8887EZK29+T is available at Aetrix Electronics and suitable for cellular handsets, digital cameras, notebook subsystems, hand-held instruments, and PCMCIA cards requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX8887EZK29+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 MAX8887 series was designed specifically for noise-sensitive, battery-powered portable electronics - emphasizing ultra-low quiescent current, low dropout, and integrated noise reduction via the BP pin to replace discrete RC filters in space-constrained layouts.

FAQ

What is the output voltage tolerance of MAX8887EZK29+T over temperature and load?

The MAX8887EZK29+T guarantees ±3% output voltage accuracy across the full -40°C to +85°C operating temperature range and for load currents from 100µA to 300mA. At +25°C and 100mA load, typical deviation is ±1.2%, and line regulation is ±0.15%/V over input voltage changes - ensuring stable 2.9V rail delivery in varying battery and system conditions.

Does MAX8887EZK29+T include a power-OK (POK) output?

No, MAX8887EZK29+T does not include a POK output. That feature is exclusive to the MAX8888 family (e.g., MAX8888EZK29+T). The MAX8887EZK29+T omits the POK pin and instead provides the BP (bypass) pin for noise filtering - confirming its role as the low-noise variant within the family.

What capacitor values are required for stable operation of MAX8887EZK29+T?

For stable operation, MAX8887EZK29+T requires a 2.2µF ceramic capacitor (ESR < 0.1Ω) between IN and GND, and another 2.2µF ceramic capacitor between OUT and GND. Additionally, a 0.01µF ceramic capacitor must be placed between BP and GND to achieve the specified 42µV_RMS output noise - all capacitors should be placed as close as possible to their respective pins.

How does the BP pin function in MAX8887EZK29+T?

The BP (bypass) pin in MAX8887EZK29+T connects to the internal voltage reference node and accepts a 0.01µF ceramic capacitor to ground. This forms a low-pass filter that attenuates reference noise, directly enabling the device's 42µV_RMS output noise specification. The BP pin is absent in MAX8888 variants, making it a key differentiator for low-noise applications.

What thermal protection features does MAX8887EZK29+T provide?

MAX8887EZK29+T incorporates thermal shutdown that activates at +170°C junction temperature, disabling the pass transistor until the die cools by 20°C hysteresis. It also includes foldback current limiting - reducing output current to ~500mA when V_OUT drops below 93% of nominal - preventing destructive power dissipation during sustained overload or short-circuit events.