Analog Devices Inc./Maxim Integrated MAX8867EUK36+T

Overview

MAX8867EUK36+T from Maxim Integrated is a low-noise, low-dropout linear regulator with a factory-preset 3.6V output, 150mA output current capability, 30µVRMS output noise, and 165mV dropout at full load. It features an internal P-channel MOSFET pass transistor, 100µA operating supply current (independent of load or dropout), and reverse battery protection. It is designed for space-constrained, battery-powered portable electronics requiring stable, clean voltage rails.

For engineers reviewing the MAX8867EUK36+T datasheet, MAX8867EUK36+T pinout, MAX8867EUK36+T application, or MAX8867EUK36+T equivalent, key selection criteria include output voltage accuracy (±1.4%), shutdown current (10nA), thermal shutdown threshold (+155°C), BP-capacitor–dependent noise reduction, and SOT23-5 package compatibility with PCB layout constraints.

Technical Context

The MAX8867EUK36+T uses a 1.25V bandgap reference and error amplifier to regulate output via an internal P-channel MOSFET pass transistor (typical R_DS(ON) = 1.1Ω). Its feedback network is fully internal-no external resistors-enabling fixed 3.6V output with ±1.4% accuracy over temperature and load.

It integrates logic-controlled shutdown (SHDN active-low), reverse-battery protection limiting reverse current to 1mA, thermal overload protection with +155°C trip and +20°C hysteresis, and current limiting (160mA min / 390mA typ). The BP pin accepts a 0.01µF ceramic capacitor to form an 80Hz low-pass filter that reduces output noise to 30µVRMS (10Hz–100kHz).

Key Specifications

Pinout & Package

SOT23-5 regular package (JEDEC MO-178AA), 2.9mm × 1.6mm × 1.1mm body, GND pin serves as thermal pad; requires soldering to large copper area for thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS76336DBVR and MCP1700T-3602E/MB, the MAX8867EUK36+T uniquely combines ultra-low noise, reverse-battery hardening, and thermal protection in a 5-pin SOT23 - making it optimal for safety-critical, battery-connected portable designs where reliability and signal integrity are non-negotiable.

Availability

MAX8867EUK36+T is available at Aetrix Electronics and suitable for cellular telephones, PCMCIA cards, palmtop computers, and hand-held instruments requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for MAX8867EUK36+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 fabless 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 engineered specifically for battery-powered portable electronics demanding ultra-low noise, low quiescent current, and robust fault protection in minimal footprint - targeting cellular handsets, PDAs, and compact instrumentation.

FAQ

What is the exact output voltage tolerance of the MAX8867EUK36+T over temperature and load?

The MAX8867EUK36+T guarantees ±1.4% output voltage accuracy over the full operating temperature range (-40°C to +85°C) and full load range (0mA to 150mA), as specified in the Electrical Characteristics table. This tolerance is achieved via factory laser trimming of the internal feedback divider and is independent of input voltage variation within the 2.5V–6.5V range. No external components affect this specification.

Does the MAX8867EUK36+T include auto-discharge functionality during shutdown?

No, the MAX8867EUK36+T does not include auto-discharge functionality. That feature is exclusive to the MAX8868 family (e.g., MAX8868EUK36+T). The MAX8867EUK36+T enters 10nA shutdown mode when SHDN is pulled low but maintains its output voltage until external discharge paths dissipate the stored charge on C_OUT.

What capacitor values are required for stable operation of the MAX8867EUK36+T?

For stable operation, the MAX8867EUK36+T requires a minimum 1µF X7R or X5R ceramic capacitor on the OUT pin (ESR <0.2Ω), and a 1µF ceramic capacitor on the IN pin. A 0.01µF ceramic capacitor must be placed on the BP pin to achieve the specified 30µVRMS noise. Larger output capacitors (up to 10µF) improve transient response and PSRR but do not affect stability margins.

Can the MAX8867EUK36+T operate with a 2.7V input when delivering 3.6V output?

No - the MAX8867EUK36+T cannot regulate 3.6V output from a 2.7V input. Its minimum input voltage is defined by V_OUT + dropout voltage. At 150mA, dropout is 165mV, so minimum VIN = 3.765V. At lighter loads (e.g., 50mA), dropout drops to 55mV, requiring VIN ≥ 3.655V. A 2.7V input is below the absolute minimum input rating of 2.5V only in dropout - it cannot sustain regulation at 3.6V.

Is the MAX8867EUK36+T pin-compatible with other regulators in the MAX886x family?

Yes, the MAX8867EUK36+T is pin-compatible with the MAX8863, MAX8864, MAX8867, and MAX8868 families in SOT23-5 packages. However, the BP pin function differs: MAX8863/MAX8864 lack BP pin functionality entirely, while MAX8867/MAX8868 use it for noise filtering. The SHDN pin behavior is identical across MAX8867 variants, but MAX8868 adds auto-discharge - a functional difference not reflected in pinout.