Analog Devices Inc./Maxim Integrated MAX25232ATCD/V+T

Overview

The MAX25232ATCD/V+T from Maxim Integrated is a 36V, 3A synchronous buck converter with integrated high-side and low-side MOSFETs, designed for automotive and industrial DC-DC conversion. It delivers ±2% output voltage accuracy in FPWM mode (6V–18V input), features 65ns minimum on-time, 400kHz fixed switching frequency, and 3.5µA quiescent current at no load-enabling ultra-low-power operation in battery-sensitive systems such as automotive body control modules.

For engineers reviewing the MAX25232ATCD/V+T datasheet, MAX25232ATCD/V+T pinout, MAX25232ATCD/V+T application, or MAX25232ATCD/V+T equivalent, key selection considerations include its AEC-Q100 qualification, 3.5V–36V input range with 40V load-dump tolerance, 99% dropout duty cycle, thermal shutdown at 175°C, and compatibility with compact 3mm × 3mm TDFN-EP packaging requiring minimal external components.

Technical Context

The MAX25232ATCD/V+T implements current-mode control with no external compensation required, enabling stable regulation across wide input/output ratios. Its 400kHz switching frequency targets maximum efficiency-reducing switching losses versus higher-frequency variants-while maintaining compatibility with standard 10µH inductors and 44µF output capacitance.

Operation includes forced-PWM (FPWM) when SYNC is tied to BIAS, skip mode under light loads (<600mA peak), and automatic entry into 3.5µA standby mode below ~5mA load. The device integrates 40V-tolerant EN and PGOOD pins, 5V internal BIAS LDO, and spread-spectrum modulation via SPS pin to suppress EMI without interfering with SYNC-synchronized operation.

Key Specifications

Pinout & Package

The MAX25232ATCD/V+T is housed in a 3mm × 3mm, 12-pin TDFN package with exposed pad (package code TD1233+2C), optimized for thermal dissipation (θ_JA = 41°C/W) and space-constrained automotive PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM61480RQR and TPS543B20RJNR, the MAX25232ATCD/V+T uniquely combines AEC-Q100 qualification, 40V load-dump tolerance, 3.5µA quiescent current, and 400kHz efficiency optimization-making it the only drop-in solution for cost-sensitive, thermally constrained automotive 5V rails requiring long-term reliability.

Availability

The MAX25232ATCD/V+T is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC I/O power supplies, ADAS camera systems, and high-voltage sensor nodes requiring stable component supply across extended temperature and lifetime requirements.

Supply support for MAX25232ATCD/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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for automotive, industrial, and communications markets.

The MAX25232 product line was designed specifically for automotive-grade DC-DC conversion-delivering ultra-low I_Q, wide input range, and robust protection in miniature packages for space- and reliability-critical applications.

FAQ

What is the output voltage of the MAX25232ATCD/V+T?

The MAX25232ATCD/V+T is a factory-trimmed 5V fixed-output buck converter. Its output voltage is precisely set to 5.0V with ±2% accuracy in forced-PWM (FPWM) mode across the 6V–18V input range. Unlike adjustable variants (e.g., MAX25232ATCF), the MAX25232ATCD/V+T does not require external resistor dividers-the FB pin is internally connected to BIAS, and the regulation is implemented via on-die trimming. This ensures consistent performance without layout sensitivity or resistor tolerance drift.

Does the MAX25232ATCD/V+T support forced-PWM (FPWM) mode?

Yes, the MAX25232ATCD/V+T supports forced-PWM mode via the SYNC pin. When SYNC is connected to the internal BIAS voltage (5V), the device operates in constant-frequency FPWM mode-ensuring predictable EMI spectra and eliminating low-frequency beat notes common in skip mode. In FPWM, the MAX25232ATCD/V+T maintains its 400kHz switching frequency across all load conditions, delivering ±2% output accuracy and stable regulation even at light loads. This mode is essential for noise-sensitive applications like ADAS cameras or audio subsystems.

What package type and thermal characteristics does the MAX25232ATCD/V+T have?

The MAX25232ATCD/V+T uses a 3mm × 3mm, 12-pin TDFN package with exposed pad (TD1233+2C). Its thermal resistance is θ_JA = 41°C/W and θ_JC = 9°C/W on a four-layer board, enabling efficient heat transfer to the PCB ground plane. The exposed pad must be soldered to a solid copper area with multiple thermal vias to achieve rated 3A output current at +125°C ambient. This package meets automotive space constraints while supporting AEC-Q100 thermal cycling and long-term reliability requirements.

How does the MAX25232ATCD/V+T handle input voltage transients such as load dump?

The MAX25232ATCD/V+T withstands 40V load-dump transients on its SUP pin-exceeding ISO 7637-2 Pulse 5a requirements-without latch-up or damage. Its input UVLO threshold is 2.73V (typ) with 0.13V hysteresis, and internal clamping diodes protect LX from overvoltage. During a 40V transient, the device remains functional if the input capacitor sustains voltage above UVLO; otherwise, it shuts down and auto-restarts after the event. This robustness is validated per AEC-Q100 stress testing and makes the MAX25232ATCD/V+T suitable for direct battery connection in automotive ECUs.

Is the MAX25232ATCD/V+T pin-compatible with other MAX25232 variants?

No, the MAX25232ATCD/V+T is not pin-compatible with adjustable-output variants like MAX25232ATCF or MAX25232ATCG. While all MAX25232 devices share the same 12-pin TDFN package and pinout, their FB pin functionality differs: MAX25232ATCD/V+T ties FB internally to BIAS for fixed 5V operation, whereas ATCF/ATCG require external resistor dividers on FB for adjustable outputs (3V–10V). Using an ATCD/V+T in a design laid out for ATCF would result in incorrect regulation. Always verify the specific variant's FB configuration before substitution.