MAX25232

PRODUCTION

36V, 3A Mini Buck Converter with 3.5uA I_Q

Best-in-Class Ultra-Low I_Q Mini Buck Ideal for Automotive Applications

Data Sheet (Rev. 3) Product Selection Table

Part Models: 14
1ku List Price: Starting From $1.45

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Overview

Synchronous DC-DC Converter with Integrated FETs
- MAX25232ATCA/VY+/B = 2.5A I_OUT
- MAX25232ATCD/VY+/E = 3A I_OUT
- 3.5µA Quiescent Current when in Standby Mode
Small Solution Size Saves Space
- 65ns Minimum On-Time
- 2.1MHz or 400kHz Operating Frequency
- Fixed 5V/3.3V Output Voltages with ±2% Output Accuracy in FPWM Mode (5V/3.3V)
- Other Fixed V_OUT Options Between 3V - 5.5V (in 50mV steps) Available for Precise Output Voltage Setting
- External Resistor Divider Options to Adjust the Output Voltage Between 3V and 10V
- Fixed 3.5ms Internal Soft-Start
- Innovative Current-Mode-Control Architecture Minimizes Total Board Space and BOM Count
PGOOD Output and High-Voltage EN Input Simplify Power Sequencing
Protection Features and Operating Range Ideal for Automotive Applications
- 3.5V to 36V Operating V_IN Range
- 40V Load-Dump Protection
- 99% Duty-Cycle Operation with Low Dropout
- -40°C to +125°C Automotive Temperature Range
- AEC-Q100 Qualified

The MAX25232 is a small, synchronous buck converter with integrated high-side and low-side switches. The device is designed to deliver up to 3A with 3.5V to 36V input voltages while using only 3.5µA quiescent current at no load.

The device provides an accurate output voltage of ±2% in FPWM mode within the normal 6V to 18V operation input range. With 65ns minimum on-time capability, the converter is capable of large input-to-output conversion ratios. Voltage quality can be monitored by observing the PGOOD signal. The device can operate in dropout by running at 99% duty cycle, making it ideal for automotive and industrial applications. The device offers two fixed 5V and 3.3V output voltages. In addition, the device can be configured for 1V to 10V output voltages using an external resistor-divider. Frequency is internally fixed at 2.1MHz, which allows for small external components and reduced output ripple, and guarantees no AM interference. A 400kHz option is also offered to provide minimum switching losses and maximum efficiency. The device automatically enters skip mode at light loads with ultra-low 3.5µA quiescent current at no load. The device offers pin-enabled spread-spectrum frequency modulation designed to minimize EMI-radiated emissions due to the modulation frequency.

The MAX25232 variants are available in a small (3mm x 3mm), 12-pin, side-wettable TDFN package with an exposed pad, and require very few external components.

Applications

Automotive
High-Voltage DC-DC Converters
Industrial

Part Models: 14
1ku List Price: Starting From $1.45

Documentation

Data Sheet 1

MAX25232: 36V, 3A Mini Buck Converter with 3.5uA I_Q Data Sheet (Rev.3) 05/07/2021

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
MAX25232ATCA/V+	12-LFCSP-3X3X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX25232ATCA/V+T	12-LFCSP-3X3X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX25232ATCB/V+	12-LFCSP-3X3X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX25232ATCB/V+T	12-LFCSP-3X3X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX25232ATCD/V+	12-LFCSP-3X3X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX25232ATCD/V+T	12-LFCSP-3X3X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX25232ATCE/V+	12-LFCSP-3X3X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX25232ATCE/V+T	12-LFCSP-3X3X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX25232ATCF/V+	12-LFCSP-3X3X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX25232ATCF/V+T	12-LFCSP-3X3X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX25232ATCG/V+	12-LFCSP-3X3X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX25232ATCG/V+T	12-LFCSP-3X3X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX25232ATCH/V+	12-LFCSP-3X3X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX25232ATCH/V+T	12-LFCSP-3X3X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Apr 27, 2024 - 2400 ASSEMBLY
		pcn_2400
MAX25232ATCA/V+	PRODUCTION
MAX25232ATCA/V+T	PRODUCTION
MAX25232ATCB/V+	PRODUCTION
MAX25232ATCB/V+T	PRODUCTION
MAX25232ATCD/V+	PRODUCTION
MAX25232ATCD/V+T	PRODUCTION
MAX25232ATCE/V+	PRODUCTION
MAX25232ATCE/V+T	PRODUCTION
MAX25232ATCF/V+	PRODUCTION
MAX25232ATCF/V+T	PRODUCTION
MAX25232ATCG/V+	PRODUCTION
MAX25232ATCG/V+T	PRODUCTION
MAX25232ATCH/V+	PRODUCTION
MAX25232ATCH/V+T	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Tools & Simulations

EE-Sim Power® Tools 1

The EE-Sim DC-DC Converter Tool uses your requirements to quickly create a complete power design including a schematic, BOM with commercially available parts, and time and frequency domain simulations. Your customized schematic can be downloaded for further analysis in the standalone EE-Sim OASIS Simulator, featuring SIMPLIS and SIMetrix SPICE engines.

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Evaluation Kits

Evaluation Kit for the MAX25232

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Features and Benefits

3.5V to 36V Input Supply Range
5V or 3.3V Fixed Output Voltage, or Adjustable Between 1V and 10V
Delivers Up to 2.5A Output Current
Frequency-Synchronization Input
Enable Input
Voltage-Monitoring PGOOD Output
Proven PCB Layout
Fully Assembled and Tested

Product Details

The MAX25232 evaluation kit (EV kit) provides a proven design to evaluate the MAX25232 2.1MHz/400kHz high-voltage mini-buck converter in a 12-pin side-wettable TDFN package. All components are rated for the automotive temperature range. Various test points and jumpers are included for evaluation.

The standard EV kit comes with the MAX25232ATCA/V+ installed (5V, 2.1MHz), but it can also be used to evaluate other MAX25232 variants with minimal component changes (e.g., IC replacement of U1).