MAX25231

PRODUCTION

36V, 1.2A Mini Buck Converter with 3.5µA I_Q

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

Data Sheet (Rev. 2)

Product Selection Table

Part Models: 6
1ku List Price: Starting From $1.31

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Overview

Synchronous DC-DC Converter with Integrated FETs
3.5μA Quiescent Current when in Standby Mode
Small Solution Size Saves Space
- 2.1MHz Frequency
- Fixed 5V/3.3V Output Voltage Options Available
- Fixed 2.5ms Internal Soft-Start
- Fixed Output Voltage with ±2% Output Accuracy
- Adjustable Voltage Output 3V to 10V Available (MAX25231ATCD)
- 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 MAX25231 is a small, synchronous automotive buck converter with integrated high-side and low-side switches. The MAX25231 is designed to deliver up to 1.2A, 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% within the normal operation input range of 6V to 18V. 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 output voltages of 5V and 3.3V. Frequency is internally fixed at 2.1MHz, which allows for small external components and reduced output ripple, and guarantees no AM interference. The device automatically enters skip mode at light loads with ultra-low quiescent current of 3.5μA at no load. The device offers pin-enabled spread-spectrum frequency modulation designed to minimize EMI-radiated emissions due to the modulation frequency.

The MAX25231 is available in a small (3mm x 3mm) 12-pin TDFN package with an exposed pad, and uses very few external components.

Applications

Always-On, Low-Quiescent-Current Systems
Automotive
High-Voltage DC-DC Converters
Industrial

Part Models: 6
1ku List Price: Starting From $1.31

Documentation

Data Sheet 1

MAX25231: 36V, 1.2A Mini Buck Converter with 3.5µA I_Q Data Sheet (Rev.2) 05/11/2021
- Open Interactive Page

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
MAX25231ATCA/V+	12-LFCSP-3X3X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX25231ATCA/V+T	12-LFCSP-3X3X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX25231ATCB/V+	12-LFCSP-3X3X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX25231ATCB/V+T	12-LFCSP-3X3X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX25231ATCD/V+	12-LFCSP-3X3X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX25231ATCD/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
MAX25231ATCA/V+	PRODUCTION
MAX25231ATCA/V+T	PRODUCTION
MAX25231ATCB/V+	PRODUCTION
MAX25231ATCB/V+T	PRODUCTION
MAX25231ATCD/V+	PRODUCTION
MAX25231ATCD/V+T	PRODUCTION
Nov 8, 2021 - 2126A WAFER FAB
		pcn_2126a
MAX25231ATCA/V+	PRODUCTION
MAX25231ATCA/V+T	PRODUCTION
MAX25231ATCB/V+	PRODUCTION
MAX25231ATCB/V+T	PRODUCTION
MAX25231ATCD/V+	PRODUCTION
MAX25231ATCD/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 MAX25231

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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 1.2A Output Current
Frequency-Synchronization Input
Enable Input
Voltage-Monitoring PGOOD Output
Proven PCB Layout
Fully Assembled and Tested

Product Details

The MAX25231 evaluation kit (EV kit) provides a proven design to evaluate the MAX25231 2.1MHz high-voltage mini-buck converters in a 12-pin TDFN package. All components are rated for the automotive temperature range. Various test points and jumpers are included for evaluation.

The EV kit comes with a MAX25231ATCA/V+ installed, but can also be used to evaluate all other MAX25231 variants with minimal U1 component changes.