Analog Devices Inc./Maxim Integrated MAX25308AATEA/V+

Overview

MAX25308AATEA/V+ from Analog Devices is a three-output automotive-grade LDO linear regulator delivering 600mA on OUT1 and 300mA each on OUT2/OUT3, with 37µVRMS output noise (10Hz–100kHz), ±1.25% DC accuracy over load/line/temperature, and factory-programmed 1.2V/1.8V/3.3V outputs - deployed in ADAS domain controllers requiring ultra-low-noise, high-accuracy power for image signal processors and radar SoCs.

For engineers reviewing the MAX25308AATEA/V+ datasheet, MAX25308AATEA/V+ pinout, MAX25308AATEA/V+ application, or MAX25308AATEA/V+ equivalent, key selection criteria include its Grade 1 automotive temperature range (−40°C to +125°C), independent EN/RESET per channel, 155mV max dropout at full load, and 3mm × 3mm TQFN-16 package with exposed pad for thermal management.

Technical Context

The MAX25308AATEA/V+ integrates three independent PMOS-based LDO regulators sharing a common bandgap reference and UVLO circuitry powered via IN1. Each channel features dedicated bypass (BYP) pins enabling programmable soft-start slew rate and noise filtering via external 10nF capacitors.

It implements overcurrent protection with 650–930mA current limit on OUT1 and 390–590mA on OUT2/OUT3, thermal shutdown at 170°C with 15°C hysteresis, and reverse-current protection triggered when IN drops 10mV below VOUT - critical for safe power sequencing in multi-rail automotive systems.

Key Specifications

Pinout & Package

MAX25308AATEA/V+ is housed in a 3mm × 3mm, 16-pin TQFN package with exposed thermal pad (EP), rated for −40°C to +125°C ambient operation and optimized for PCB heat dissipation via EP-to-ground vias.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar triple-output LDO applications.

Compared with TPS7H3301-SP and NCP114AMX330T2G, the MAX25308AATEA/V+ uniquely combines AEC-Q100 Grade 1 qualification, factory-programmed triple outputs, per-channel RESET, and 37µVRMS noise - making it the only drop-in solution for production ADAS ECUs requiring zero design-in risk.

Availability

MAX25308AATEA/V+ is available at Aetrix Electronics and suitable for ADAS domain controllers, radar sensor modules, automotive infotainment head units, and camera processing nodes requiring stable component supply across extended automotive temperature ranges and long product lifecycles.

Supply support for MAX25308AATEA/V+ 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

Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, communications, and healthcare markets with precision power, sensing, and signal chain solutions.

The MAX25308AATEA/V+ belongs to Analog Devices' automotive power management portfolio, designed specifically to meet stringent noise, accuracy, and reliability requirements of ASIL-B/C ADAS and infotainment systems.

FAQ

What is the factory-programmed output voltage configuration of the MAX25308AATEA/V+?

The MAX25308AATEA/V+ is factory-programmed to deliver 1.2V/600mA on OUT1, 1.8V/300mA on OUT2, and 3.3V/300mA on OUT3. These values are fixed and cannot be adjusted externally - confirmed in the Ordering Information table of the official datasheet. No resistor networks or configuration pins are required to set these outputs, simplifying layout and reducing BOM count. The MAX25308AATEA/V+ achieves this using internal laser-trimmed feedback networks.

Does the MAX25308AATEA/V+ support independent power sequencing between its three outputs?

Yes, the MAX25308AATEA/V+ supports fully independent power sequencing via separate EN1, EN2, and EN3 inputs, each with individual logic thresholds (1.2V rising, 0.4V falling) and hysteresis. This allows staggered turn-on/turn-off of OUT1, OUT2, and OUT3 - essential for avoiding bus contention or inrush current spikes in complex SoC systems. The device does not impose inter-channel timing dependencies beyond the requirement that IN1 be powered before enabling OUT2/OUT3.

How is reverse current protection implemented in the MAX25308AATEA/V+?

The MAX25308AATEA/V+ implements reverse current protection by monitoring the voltage difference between each INx and its corresponding OUTx. When INx drops 10mV below OUTx, an internal detector disables the PMOS pass transistor and opens the body diode path, blocking reverse current flow. This prevents backfeeding from higher-voltage rails during partial power-down - a critical feature in automotive systems with multiple independent power domains. The protection activates independently per channel.

What is the thermal performance of the MAX25308AATEA/V+ in a standard four-layer PCB layout?

In a standard four-layer PCB layout with the exposed pad (EP) connected to a solid ground plane using ≥4 thermal vias (0.3mm diameter), the MAX25308AATEA/V+ achieves a junction-to-ambient thermal resistance (θJA) of 46.47°C/W. At maximum continuous power dissipation (1721.69mW), this yields a worst-case junction temperature rise of ~80°C above ambient - well within the +150°C absolute maximum rating. Derating begins above +70°C ambient at 21.52mW/°C.

Can the RESET outputs of the MAX25308AATEA/V+ be used without external pull-up resistors?

No, the RESET outputs (RESET1, RESET2, RESET3) of the MAX25308AATEA/V+ are open-drain and require external pull-up resistors to a valid logic supply (e.g., 3.3V or 5V) to generate a defined high-level signal. Without a pull-up, the RESET pin remains floating when not asserted, making it unusable for reliable system monitoring. The datasheet recommends a 10kΩ pull-up for typical applications, ensuring fast rise time and compatibility with standard logic families.