Analog Devices Inc./Maxim Integrated MAX25301BATB/V+T

Overview

MAX25301BATB/V+T from Maxim Integrated is an automotive-grade low-noise linear regulator delivering up to 1A output current with 7µVRMS output noise (10Hz–100kHz), ±1% DC accuracy over load/line/temperature, and only 100mV dropout at full load. It operates from 1.7V to 5.5V input and supports adjustable output voltage from 0.6V to 5.3V via external resistors, targeting power-sensitive analog and digital subsystems in vehicle ECUs and ADAS sensors.

For engineers reviewing the MAX25301BATB/V+T datasheet, MAX25301BATB/V+T pinout, MAX25301BATB/V+T application, or MAX25301BATB/V+T equivalent, key selection criteria include its AEC-Q100 qualification, programmable soft-start rate, active-high POK signal for safe load startup, reverse-current protection, and stable operation with ≥4µF output capacitance - all critical for automotive power integrity validation.

Technical Context

The MAX25301BATB/V+T implements a pMOS-based LDO architecture with integrated reference filtering via the BYP pin, enabling ultra-low noise performance. Its feedback loop uses a fixed 0.6V internal reference and external resistor divider (FB pin), supporting precise output configuration across the 0.6V–5.3V range while maintaining 70dB PSRR at 10kHz.

Protection logic includes thermal shutdown (trip at 165°C, hysteresis 15°C), cycle-by-cycle current limiting (1.4A typ), and reverse-current blocking triggered when VIN falls 10mV below VOUT. The POK output asserts high after VOUT reaches 91% of regulation and deasserts during overload or shutdown - providing deterministic power sequencing control.

Key Specifications

Pinout & Package

MAX25301BATB/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. The exposed pad must be soldered to a solid ground plane with ≥4 thermal vias for θJA ≤ 41°C/W on four-layer boards.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7B8250QDGNRQ1 and NCP163AMX330TBG, the MAX25301BATB/V+T offers superior noise performance (7 vs. 12–15µVRMS), higher output current (1A vs. 250–350mA), and full 0.6V–5.3V adjustability - making it uniquely suited for multi-rail automotive domains requiring precision, flexibility, and robustness.

Availability

MAX25301BATB/V+T is available at Aetrix Electronics and suitable for automotive electronics, ADAS sensor power, infotainment audio systems, and telematics modem biasing requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX25301BATB/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 deep expertise in power management and signal conditioning.

The MAX25301A/B product line delivers ultra-low-noise, AEC-Q100-qualified LDOs specifically engineered for noise-sensitive automotive subsystems including camera modules, radar processors, and audio codecs.

FAQ

What output voltage range does the MAX25301BATB/V+T support?

The MAX25301BATB/V+T supports an adjustable output voltage range from 0.6V to 5.3V, set using an external resistor divider connected to the FB pin. This is achieved by leveraging the device's internal 0.6V feedback reference, where VOUT = 0.6V × (1 + R1/R2). The MAX25301BATB/V+T does not support pin-selectable voltages - that functionality belongs to the MAX25301A variant.

Does the MAX25301BATB/V+T include a Power-OK (POK) output?

Yes, the MAX25301BATB/V+T includes an active-high open-drain POK output (Pin 6) that asserts high when the output voltage reaches 91% of its regulated value. This signal remains high during normal operation and goes low during overload, shutdown, or output undervoltage. An external pullup resistor is required to generate a logic-compatible reset signal for downstream microcontrollers.

What is the minimum output capacitance required for stability with the MAX25301BATB/V+T?

The MAX25301BATB/V+T requires a minimum of 4µF total output capacitance (including DC bias and temperature derating) placed between OUT and GND for guaranteed stability. A 10µF X5R or X7R ceramic capacitor is recommended. The capacitor must have low ESR (<0.03Ω) and maintain rated capacitance across the full -40°C to +125°C operating range.

How does the MAX25301BATB/V+T handle reverse current protection?

The MAX25301BATB/V+T integrates reverse-current protection that blocks current flow from OUT to IN when VOUT exceeds VIN by more than 10mV. This feature activates automatically and opens the pMOS pass transistor's body diode path, preventing >400mA reverse current. It eliminates the need for an external Schottky diode in battery backup or dual-supply configurations.

What package type and thermal considerations apply to the MAX25301BATB/V+T?

The MAX25301BATB/V+T uses a 10-pin 3mm × 3mm TDFN package with exposed thermal pad (EP). For thermal reliability, the EP must be soldered to a solid GND plane with ≥4 thermal vias. On a four-layer board, this achieves θJA = 41°C/W. Without proper EP connection, junction temperature rise may exceed limits under 1A load, triggering thermal shutdown.