Analog Devices Inc./Maxim Integrated MAX25301AATB/V+T

Overview

MAX25301AATB/V+T from Maxim Integrated is an AEC-Q100 qualified automotive low-noise linear regulator delivering 1A output current with 7µVRMS output noise (10Hz–100kHz), ±1% DC output accuracy over load/line/temperature, and only 100mV dropout at full load. It features pin-selectable fixed outputs (1.2V–5.0V), programmable soft-start via BYP capacitor, and operates from 1.7V to 5.5V input in vehicle infotainment power rails.

For engineers reviewing the MAX25301AATB/V+T datasheet, MAX25301AATB/V+T pinout, MAX25301AATB/V+T application, or MAX25301AATB/V+T equivalent, key selection criteria include ultra-low noise for audio ADC supplies, tight DC accuracy across -40°C to +125°C, minimal headroom requirement for battery-supplied systems, and AEC-Q100 qualification for under-hood deployment.

Technical Context

The MAX25301AATB/V+T implements a pMOS-based LDO architecture with internal 0.6V reference and precision error amplifier, enabling stable regulation with only 4µF minimum output capacitance. Its pin-selectable voltage configuration uses SELA/SELB inputs sampled once at startup to set one of nine discrete output voltages without external resistors.

Protection circuitry includes thermal shutdown (165°C trip, 150°C release), output short-circuit current limiting (1.4A typ), and reverse-current blocking activated when VIN falls 10mV below VOUT - critical for automotive stop-start and load-dump scenarios where output capacitors may retain charge.

Key Specifications

Pinout & Package

MAX25301AATB/V+T is housed in a 10-pin 3mm × 3mm TDFN package with exposed thermal pad (EP), optimized for automotive PCB space constraints and thermal dissipation on single- or four-layer boards (θJA = 41°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7B8750QKVURQ1 and TLV73318PQDBVRQ1, the MAX25301AATB/V+T uniquely combines 1A output, 7µVRMS noise, nine pin-selectable voltages, and AEC-Q100 Grade 0 in a 3mm × 3mm footprint - making it the only option for high-fidelity automotive power delivery requiring both performance and flexibility.

Availability

MAX25301AATB/V+T is available at Aetrix Electronics and suitable for automotive infotainment systems, ADAS camera modules, and engine control units requiring stable component supply with AEC-Q100 assurance and long-term production continuity.

Supply support for MAX25301AATB/V+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 and mixed-signal ICs for automotive, industrial, and communications markets, with emphasis on reliability and integration.

The MAX25301A/B product line delivers ultra-low-noise, AEC-Q100 qualified LDOs targeting noise-sensitive automotive subsystems including infotainment, ADAS, and powertrain control where precision regulation and robust fault handling are mandatory.

FAQ

What output voltages does the MAX25301AATB/V+T support?

The MAX25301AATB/V+T supports nine pin-selectable fixed outputs: 1.2V, 1.5V, 1.8V, 2.5V, 3.0V, 3.1V, 3.3V, 4.0V, and 5.0V. Voltage selection is determined by the logic states (GND, IN, or floating) applied to SELA and SELB pins at power-up only - the MAX25301AATB/V+T does not support dynamic reconfiguration during operation.

Does the MAX25301AATB/V+T include reverse-current protection?

Yes, the MAX25301AATB/V+T includes active reverse-current protection that disables the pMOS pass device when VIN drops 10mV below VOUT. This prevents backfeed from output capacitors during battery disconnect or cold-cranking events - a critical feature for automotive systems where load capacitance may retain charge longer than input supply.

What is the minimum output capacitance required for stability with the MAX25301AATB/V+T?

The MAX25301AATB/V+T requires a minimum of 4µF total output capacitance (including voltage and temperature derating) using X5R or X7R ceramic capacitors. A typical design uses 10µF, and the capacitor must have ESR <0.03Ω to ensure phase margin and transient stability across the full -40°C to +125°C operating range.

How does the BYP pin function in the MAX25301AATB/V+T?

The BYP pin on the MAX25301AATB/V+T serves two functions: it filters reference noise to achieve 7µVRMS output noise, and sets the output voltage slew rate during startup. A 0.01µF capacitor yields 5V/ms slew; values from 0.001µF to 0.1µF adjust startup rate per the formula StartupSlewRate = (5V/ms) × (0.01µF / CBYP). Leakage >10nA at BYP degrades output accuracy.

Is the MAX25301AATB/V+T compatible with standard 10-pin TDFN 3mm × 3mm footprints?

Yes, the MAX25301AATB/V+T uses the industry-standard 10-pin TDFN 3mm × 3mm package (outline number 21-0137, land pattern 90-0003) with exposed thermal pad. It is mechanically and thermally compatible with standard PCB layouts for this footprint, provided ≥4 thermal vias connect EP to an internal ground plane for optimal heat dissipation and AEC-Q100 reliability.