Analog Devices Inc./Maxim Integrated MAX25232ATCD/V+

Overview

The MAX25232ATCD/V+ from Maxim Integrated is a 36V, 3A synchronous buck converter with integrated high-side and low-side MOSFETs, delivering ±2% output voltage accuracy in forced-PWM mode across 6V–18V input range, 400kHz fixed switching frequency, and 3.5µA quiescent current at no load-designed for automotive power rails requiring AEC-Q100 qualification and 40V load-dump protection.

For engineers reviewing the MAX25232ATCD/V+ datasheet, MAX25232ATCD/V+ pinout, MAX25232ATCD/V+ application, or MAX25232ATCD/V+ equivalent, key selection considerations include its 99% dropout duty cycle, PGOOD monitoring capability, spread-spectrum EMI reduction via SPS pin, and compatibility with 3V–5.5V fixed-output variants in the same TDFN-EP package.

Technical Context

This device implements current-mode control with internal compensation, enabling stable regulation without external loop components. Its 65ns minimum on-time supports high step-down ratios (e.g., 24V→3.3V), while the 400kHz switching frequency optimizes efficiency over light-to-heavy loads.

Operation includes dual modes: forced-PWM (FPWM) when SYNC is tied to BIAS, ensuring constant frequency for EMI-sensitive systems; and skip mode when SYNC is grounded or floating, reducing quiescent current to 3.5µA at no load. Thermal shutdown triggers at 175°C with 15°C hysteresis, and undervoltage lockout activates at 2.73V (typ) on SUP.

Key Specifications

Pinout & Package

The MAX25232ATCD/V+ is housed in a thermally enhanced 12-pin TDFN-EP package (3mm × 3mm) with exposed pad soldered to PCB ground plane for optimal thermal dissipation (θ_JA = 41°C/W).

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 MAX25232ATCD/V+ delivers superior automotive readiness through integrated 40V load-dump protection, AEC-Q100 Grade 0 qualification, and 3.5µA no-load current-making it uniquely suited for cost-sensitive, space-constrained, and safety-critical vehicle subsystems.

Availability

The MAX25232ATCD/V+ is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and body control units requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX25232ATCD/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 precision analog, mixed-signal, and power management ICs for automotive, industrial, and communications markets.

The MAX25232 product line targets automotive power conversion with emphasis on AEC-Q100 compliance, ultra-low quiescent current, and high-voltage transient resilience-enabling compact, reliable DC-DC solutions for next-generation vehicle electronics.

FAQ

What output voltage does the MAX25232ATCD/V+ deliver?

The MAX25232ATCD/V+ delivers a factory-trimmed fixed 5V output with ±2% accuracy in forced-PWM mode across its normal 6V–18V input range. It is not user-adjustable-unlike the MAX25232ATCF/ATCG variants, which support 3V–10V via external resistor divider. The 5V rail is internally referenced and requires no external feedback components.

Does the MAX25232ATCD/V+ support automotive load-dump conditions?

Yes, the MAX25232ATCD/V+ withstands 40V load-dump transients per ISO 7637-2 Pulse 5a without external protection. Its absolute maximum SUP rating is +40V, and internal circuitry remains functional during these events. This eliminates the need for external TVS diodes in most automotive front-end power designs, simplifying layout and improving reliability.

How does the MAX25232ATCD/V+ achieve ultra-low quiescent current?

The MAX25232ATCD/V+ achieves 3.5µA quiescent current at no load by entering standby mode automatically when the high-side FET remains off for eight consecutive clock cycles. In this state, non-essential internal blocks-including the high-voltage LDO-are disabled. Standby mode is active only in skip mode and is optimized for fixed-output variants like the MAX25232ATCD/V+.

Can the MAX25232ATCD/V+ operate in dropout, and what is its minimum input voltage?

Yes, the MAX25232ATCD/V+ operates in dropout with up to 99% duty cycle, sustaining regulation down to ~5.5V input for a 5V output. Its minimum operating input voltage is 3.5V, but dropout behavior begins when VIN approaches VOUT. During dropout, the device periodically refreshes the BST capacitor using a 20µs off-time and 200ns low-side conduction to maintain gate drive integrity.

What package type and thermal performance does the MAX25232ATCD/V+ use?

The MAX25232ATCD/V+ uses a 12-pin TDFN-EP package (3mm × 3mm) with exposed pad. On a standard four-layer PCB, it achieves θ_JA = 41°C/W and θ_JC = 9°C/W. The exposed pad must be soldered to a solid ground plane with multiple thermal vias to realize full thermal performance-enabling continuous 3A output at +125°C ambient when properly implemented.