Analog Devices Inc./Maxim Integrated MAX8867EUK27+T

Overview

MAX8867EUK27+T from Maxim Integrated is a low-noise, low-dropout linear regulator with 2.7V preset output voltage, 150mA output current capability, 30µVRMS output noise, and 165mV dropout at full load - designed for space-constrained battery-powered systems such as handheld instruments and PCMCIA cards.

For engineers reviewing the MAX8867EUK27+T datasheet, MAX8867EUK27+T pinout, MAX8867EUK27+T application, or MAX8867EUK27+T equivalent, key selection criteria include guaranteed ±1.4% output accuracy over temperature, 10nA shutdown current, reverse battery protection, and SOT23-5 package compatibility with MAX8863/MAX8864 footprints.

Technical Context

The MAX8867EUK27+T uses an internal P-channel MOSFET pass transistor (1.1Ω typical R_DS(ON)) to achieve low quiescent current (100µA across all load and dropout conditions) and eliminate base-drive losses inherent in PNP-based LDOs. Its error amplifier compares a 1.25V bandgap reference against feedback from an internal resistor divider to regulate output voltage.

Noise reduction is implemented via a dedicated BP pin connected to an external 0.01µF capacitor, forming an 80Hz low-pass filter that reduces output voltage noise to 30µVRMS (10Hz–100kHz). Thermal shutdown activates at +155°C with +15°C hysteresis, and short-circuit protection sustains indefinite ground faults without damage.

Key Specifications

Pinout & Package

SOT23-5 regular package (JEDEC MO-178AA), 2.9mm × 1.6mm × 1.1mm body, GND pin serves as thermal path - requires soldering to large copper area for rated power dissipation (571mW at +70°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX8867EUK27+T, the MAX8867EUK27-T offers identical performance in tray packaging, while the TPS76327QDBVRQ1 trades lower quiescent current for higher noise and dropout - making it unsuitable for noise-sensitive portable designs where MAX8867EUK27+T's 30µVRMS and 165mV dropout are critical.

Availability

MAX8867EUK27+T is available at Aetrix Electronics and suitable for handheld instruments, PCMCIA cards, cordless telephones, and electronic planners requiring stable component supply with guaranteed long-term sourcing.

Supply support for MAX8867EUK27+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 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 ultra-low-noise, low-quiescent-current regulation in compact battery-powered devices - prioritizing noise floor, dropout, and shutdown leakage over raw current capability.

FAQ

What is the exact output voltage tolerance of the MAX8867EUK27+T over temperature?

The MAX8867EUK27+T guarantees ±1.4% output voltage accuracy across the full operating temperature range of –40°C to +85°C. This specification is production-tested and applies to all units shipped - no binning or post-assembly calibration is required to meet this tolerance. The 2.7V nominal output remains within 2.662V to 2.738V under worst-case thermal and load conditions, ensuring reliable operation of downstream 2.7V logic and analog circuits.

Does the MAX8867EUK27+T include auto-discharge functionality during shutdown?

No, the MAX8867EUK27+T does not provide auto-discharge. That feature is exclusive to the MAX8868 family (e.g., MAX8868EUK27+T). When the MAX8867EUK27+T is placed in shutdown (SHDN = low), the output remains floating at its last regulated voltage - it does not actively pull OUT to GND. Designers requiring fast output discharge must select the MAX8868 variant or add external circuitry.

What capacitor values are required for stable operation of the MAX8867EUK27+T?

The MAX8867EUK27+T requires a minimum 1µF ceramic input capacitor (X5R/X7R dielectric) and a 1µF–10µF low-ESR output capacitor for stable operation across –40°C to +85°C and up to 150mA load. A 0.01µF ceramic capacitor on the BP pin is mandatory to achieve the specified 30µVRMS noise. Using Z5U/Y5V dielectrics may require ≥2.2µF output capacitance to maintain stability below –10°C.

Can the MAX8867EUK27+T be used with input voltages below 2.5V?

No - the absolute minimum input voltage for the MAX8867EUK27+T is 2.5V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. Operation below 2.5V risks improper regulation, increased dropout, or complete failure to maintain 2.7V output. For sub-2.5V inputs, consider alternative regulators such as the MAX1726 or TPS780xx series, which support down to 1.8V or lower.

Is the MAX8867EUK27+T pin-compatible with the MAX8863 series?

Yes, the MAX8867EUK27+T is pin-compatible with the MAX8863 and MAX8864 in SOT23-5 packages, except for the BP pin (pin 5). The MAX8863/64 lack the BP pin and corresponding noise-reduction circuitry - so while footprint and signal pin assignments (IN, GND, OUT, SHDN) match, the BP pin on MAX8867EUK27+T must remain unconnected or tied to GND if replacing a MAX8863/64 in an existing design.