Analog Devices Inc./Maxim Integrated MAX25232ATCH/V+T

Overview

The MAX25232ATCH/V+T from Maxim Integrated is a 36V, 3A synchronous buck converter with integrated high-side and low-side MOSFETs, delivering ±2% output voltage accuracy at 4V in FPWM mode across 6V–18V input, 3.5µA quiescent current at no load, and 65ns minimum on-time for high step-down ratios-designed for automotive power rails feeding ADAS sensors and infotainment systems.

For engineers reviewing the MAX25232ATCH/V+T datasheet, MAX25232ATCH/V+T pinout, MAX25232ATCH/V+T application, or MAX25232ATCH/V+T equivalent, key selection criteria include its AEC-Q100 qualification, 40V load-dump protection, 99% dropout duty cycle, fixed 4V output, and compatibility with compact 3mm × 3mm TDFN-EP packaging requiring minimal external components.

Technical Context

This device uses current-mode control architecture with internal compensation, enabling stable regulation without external loop components. It supports dual switching frequencies-2.1MHz (typ) for small magnetics and low EMI, or 400kHz (typ) for peak efficiency-and features forced-PWM/skip-mode selection via SYNC pin logic level.

Thermal protection includes 175°C shutdown with 15°C hysteresis, while PGOOD monitoring provides open-drain reset signaling with 92–95% output voltage thresholds. The SPS pin enables ±3% spread-spectrum modulation to reduce radiated emissions without affecting SYNC-synchronized operation.

Key Specifications

Pinout & Package

The MAX25232ATCH/V+T is housed in a thermally enhanced 12-pin TDFN package (3mm × 3mm) with exposed pad, optimized for automotive PCB thermal management and high-current routing.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck converter applications.

Compared with LM61480QPWPRQ1 and TPS543B20RTWR, the MAX25232ATCH/V+T offers superior automotive robustness (40V load-dump, AEC-Q100 Grade-1), smaller footprint (3mm × 3mm vs. 4mm × 4mm), and lower quiescent current-making it optimal for space- and power-constrained automotive subsystems where qualification and transient immunity are mandatory.

Availability

MAX25232ATCH/V+T is available at Aetrix Electronics and suitable for automotive ADAS, body electronics, and infotainment systems requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.

Supply support for MAX25232ATCH/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 precision analog, mixed-signal, and power management ICs for automotive, industrial, and communications markets.

The MAX25232 product line delivers compact, high-reliability DC-DC converters targeting automotive power systems needing wide input range, ultra-low IQ, and AEC-Q100 qualification.

FAQ

What is the output voltage of the MAX25232ATCH/V+T?

The MAX25232ATCH/V+T provides a factory-trimmed fixed 4V output with ±2% accuracy in forced-PWM mode across the 6V–18V input range. This value is laser-trimmed during production and does not require external resistor dividers-unlike adjustable variants such as MAX25232ATCF. The 4V rail meets common requirements for automotive imaging sensors and low-voltage microcontrollers.

Does the MAX25232ATCH/V+T support AEC-Q100 qualification?

Yes, the MAX25232ATCH/V+T is AEC-Q100 Grade-1 qualified, meaning it has been tested and certified for operation from −40°C to +125°C junction temperature with full automotive reliability validation including HTOL, TC, and ESD. This qualification is documented in the official Maxim Integrated datasheet Rev 3 (April 2021) and applies specifically to the MAX25232ATCH/V+T variant.

What package type does the MAX25232ATCH/V+T use?

The MAX25232ATCH/V+T uses a 12-pin TDFN package with exposed pad (3mm × 3mm, outline number 21-0664). Its package code is TD1233+2C, and it features a thermally enhanced exposed pad that must be soldered to a PCB ground plane for effective heat dissipation-critical for maintaining ≤125°C junction temperature at 3A continuous load.

How does the MAX25232ATCH/V+T handle load-dump transients?

The MAX25232ATCH/V+T withstands 40V load-dump transients per ISO 7637-2 Pulse 5a without external protection components. Its absolute maximum SUP rating is +40V, and internal clamp diodes between LX and SUP/PGND provide robust fault handling. This eliminates the need for external TVS diodes in most automotive front-end designs, reducing cost and board area.

Can the MAX25232ATCH/V+T operate in dropout mode?

Yes, the MAX25232ATCH/V+T supports 99% maximum duty cycle operation, enabling true dropout functionality where output voltage closely tracks input voltage down to VIN ≈ VOUT + 0.2V. During dropout, the internal bootstrap capacitor is periodically recharged using a 200ns low-side FET pulse every 20µs-ensuring gate drive integrity without external circuitry.