Analog Devices Inc./Maxim Integrated MAX8867EUK30+T

Overview

MAX8867EUK30+T from Maxim Integrated is a low-noise, low-dropout linear regulator with a factory-preset 3.0V output, 150mA output current capability, 30µVRMS output noise, and 165mV dropout at full load - designed for battery-powered portable electronics requiring stable, clean power under light-to-moderate loads.

For engineers reviewing the MAX8867EUK30+T datasheet, MAX8867EUK30+T pinout, MAX8867EUK30+T application, or MAX8867EUK30+T equivalent, key selection criteria include output voltage accuracy (±1.4%), shutdown current (10nA), thermal/short-circuit protection, reverse battery tolerance, and SOT23-5 package compatibility with space-constrained handheld designs.

Technical Context

The MAX8867EUK30+T uses an internal P-channel MOSFET pass transistor (1.1Ω typical R_DS(ON)) to achieve ultra-low quiescent current (100µA across all load and dropout conditions) and eliminate base-drive losses inherent in PNP-based LDOs. Its feedback loop integrates a 1.25V bandgap reference and error amplifier with fixed internal resistor divider to maintain precise 3.0V output regulation.

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 noise to 30µVRMS (10Hz–100kHz). The device includes reverse-battery protection limiting reverse current to 1mA, thermal shutdown at +155°C with 15°C hysteresis, and current limiting set to 160–390mA.

Key Specifications

Pinout & Package

SOT23-5 regular package (5-pin, 1.6mm × 2.9mm × 1.1mm body height), thermally enhanced with GND pin serving as heatsink - requires soldering to large PCB copper area for optimal thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX8863EUK30+T, the MAX8867EUK30+T provides 40% lower output noise and dedicated BP filtering; versus MCP1700T-3002E/MB, it offers logic-controlled shutdown, reverse-battery protection, and tighter output accuracy - at the cost of larger SOT23-5 footprint and higher minimum IQ.

Availability

MAX8867EUK30+T is available at Aetrix Electronics and suitable for cellular handsets, PCMCIA cards, palmtop computers, and electronic planners requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for MAX8867EUK30+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) designs high-performance analog, mixed-signal, and power-management ICs for demanding industrial, communications, and consumer applications.

The MAX8867/MAX8868 product line targets battery-powered portable electronics, delivering ultra-low noise, low IQ, and robust protection features in miniature SOT23 packages - optimized for space- and power-constrained handheld systems.

FAQ

What is the output voltage tolerance of the MAX8867EUK30+T over temperature and load?

The MAX8867EUK30+T guarantees ±1.4% output voltage accuracy over the full -40°C to +85°C operating temperature range and 0mA to 150mA load current. This specification includes initial trim error, line regulation (±0.15%/V), and load regulation (±0.04%/mA), ensuring stable 3.0V operation across battery discharge and ambient conditions without external calibration. The MAX8867EUK30+T achieves this using a laser-trimmed internal resistor divider referenced to a 1.25V bandgap.

Does the MAX8867EUK30+T include reverse battery protection, and how does it function?

Yes, the MAX8867EUK30+T includes integrated reverse battery protection that limits reverse current to ≤1mA when either the IN or SHDN pin falls below ground potential. This is achieved by monitoring polarity at both pins and disconnecting internal circuitry and parasitic paths before damaging reverse conduction occurs. The MAX8867EUK30+T remains undamaged and resumes normal operation once correct polarity is restored - a critical safeguard for handheld devices with user-replaceable batteries.

What capacitor values are required for stable operation of the MAX8867EUK30+T?

For stable operation, the MAX8867EUK30+T requires a minimum 1µF ceramic input capacitor (CIN) and a 1µF to 10µF ceramic output capacitor (COUT) with ESR < 0.2Ω. A 0.01µF ceramic capacitor must be placed on the BP pin to achieve 30µVRMS noise performance. X7R or X5R dielectrics are recommended for COUT to ensure stable capacitance across temperature; Z5U/Y5V types may require ≥2.2µF for low-temperature stability. The MAX8867EUK30+T's stability region is validated up to 150mA load with these values.

How does the shutdown functionality of the MAX8867EUK30+T differ from the MAX8868EUK30+T?

The MAX8867EUK30+T features a logic-controlled shutdown pin (SHDN) that reduces supply current to 10nA when pulled low, but does not discharge the output capacitor. In contrast, the MAX8868EUK30+T adds auto-discharge functionality: when SHDN is low, an internal switch actively pulls the OUT pin to GND, discharging external capacitance. Since the MAX8867EUK30+T lacks this circuit, external discharge components are needed if rapid output decay is required - a key distinction affecting system power sequencing design.

What thermal considerations apply to the MAX8867EUK30+T in SOT23-5 package?

The MAX8867EUK30+T in SOT23-5 regular package has a junction-to-board thermal resistance (θ_JB) of 140°C/W. To avoid thermal shutdown at +155°C, the PCB must provide adequate copper area connected to the GND pin - acting as both electrical return and heatsink. At 150mA load with 3.5V input (1.0W dissipation), ambient temperature must remain below +55°C with standard 1oz copper unless additional thermal vias or copper pours are used. Derating begins above +70°C at 7.1mW/°C.