Analog Devices Inc./Maxim Integrated MAX25301AATB/V+

Overview

MAX25301AATB/V+ from Maxim Integrated is an AEC-Q100 qualified automotive low-noise linear regulator delivering 1A output current with 7µVRMS noise (10Hz–100kHz), ±1% DC accuracy over load/line/temperature, and only 100mV dropout at full load. It features nine pin-selectable output voltages (1.2V to 5.0V), programmable soft-start, and reverse-current protection - deployed in ADAS camera modules, infotainment power rails, and high-resolution sensor biasing.

For engineers reviewing the MAX25301AATB/V+ datasheet, MAX25301AATB/V+ pinout, MAX25301AATB/V+ application, or MAX25301AATB/V+ equivalent, key selection criteria include its 1.7V–5.5V input range, 3mm × 3mm TDFN package with exposed pad, automotive-grade thermal performance (−40°C to +125°C), and pin-selectable fixed-output architecture distinct from adjustable variants like MAX25301BATB/V+.

Technical Context

The MAX25301AATB/V+ implements a pMOS pass transistor architecture with internal 0.6V reference and precision error amplifier, enabling tight regulation without external feedback components. Its SELA/SELB digital input interface samples voltage configuration only at startup, supporting static selection of one of nine discrete outputs via GND/IN/floating states.

It integrates active protection including thermal shutdown (165°C trip, 150°C recovery), output short-circuit current limiting (1.4A typ), and reverse-current blocking triggered when VIN falls 10mV below VOUT - critical for automotive load-dump and battery-reversal scenarios.

Key Specifications

Pinout & Package

MAX25301AATB/V+ is housed in a 10-pin 3mm × 3mm TDFN package with exposed thermal pad (EP). The pinout is optimized for low-noise layout: IN and OUT pins are adjacent to GND for minimal loop area; BYP and OUTS provide dedicated noise filtering and remote sensing paths.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX25301BATB/V+, the MAX25301AATB/V+ trades programmability and POK for simplified fixed-voltage implementation and reduced external component count; versus TLE42744G, it delivers 5.7× lower noise and 2.5× higher current for analog-intensive automotive subsystems.

Availability

MAX25301AATB/V+ is available at Aetrix Electronics and suitable for automotive ADAS camera modules, infotainment audio subsystems, and high-resolution sensor biasing requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.

Supply support for MAX25301AATB/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

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, integration, and power efficiency.

The MAX25301A/B family targets automotive power management with ultra-low noise, AEC-Q100 qualification, and robust protection - specifically engineered for camera, radar, and sensor modules demanding clean, stable, and fault-tolerant voltage regulation.

FAQ

What output voltage options are supported by the MAX25301AATB/V+?

The MAX25301AATB/V+ supports nine fixed output voltages: 1.2V, 1.5V, 1.8V, 2.5V, 3.0V, 3.1V, 3.3V, 4.0V, and 5.0V. These are selected using the SELA and SELB pins tied to GND, IN, or left floating - per Table 1 in the datasheet. The configuration is latched at power-up and cannot be changed dynamically during operation. Each combination maps deterministically to one output voltage, enabling precise rail assignment without external resistors.

Does the MAX25301AATB/V+ include power-good (POK) functionality?

No, the MAX25301AATB/V+ does not include a power-good (POK) output. That feature is exclusive to the MAX25301B variant (e.g., MAX25301BATB/V+). The MAX25301AATB/V+ provides EN (enable) and OUTS (remote sense) pins but lacks the open-drain POK signal used for system reset sequencing. If POK is required, MAX25301BATB/V+ is the functionally equivalent alternative with identical package, thermal specs, and noise performance.

How is remote voltage sensing implemented on the MAX25301AATB/V+?

The MAX25301AATB/V+ implements remote sensing via the OUTS pin (Pin 7), which connects directly to the load's high-side return point. This allows the error amplifier to regulate voltage at the load rather than at the IC's OUT pin, compensating for IR drop across PCB traces. For optimal accuracy, OUTS must be routed separately from the main OUT trace and connected near the load's ground reference. The feature ensures ±1% regulation is maintained at the actual load terminal even with up to 50mΩ series resistance.

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

The MAX25301AATB/V+ requires a minimum of 4µF total output capacitance at the OUT pin for guaranteed stability, including derating effects from temperature and DC bias. A 10µF X5R or X7R ceramic capacitor is recommended, placed as close as possible to the OUT and GND pins. The capacitor must have ESR ≤ 0.03Ω; higher ESR risks oscillation. Unlike some LDOs, this device does not require specific ESR zero placement - stability is ensured across the specified COUT range when using low-ESR ceramics.

Can the MAX25301AATB/V+ operate during automotive cold-crank conditions?

Yes, the MAX25301AATB/V+ supports automotive cold-crank with an input voltage range down to 1.7V. Its ability to maintain regulation with only 100mV dropout at 1A load enables operation even when battery voltage sags to ~2.5V while powering a 1.5V or 1.8V rail. Combined with −40°C to +125°C operation and AEC-Q100 qualification, this makes the MAX25301AATB/V+ suitable for engine-control, transmission, and body-control modules exposed to harsh cranking transients.