MAX25239

RECOMMENDED FOR NEW DESIGNS

Automotive 2V to 36V, 6A Buck-Boost Converters

Industry's only 6A Automotive Buck-Boost with Integrated H-Bridge Switches

Data Sheet (Rev. 11) Product Selection Table

Part Models: 6
1ku List Price: Starting From $3.10

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Overview

Meets Stringent Automotive Quality and Reliability Requirements
- 2V to 36 Operating Input Voltage Range Allows Operation in Cold-Crank Conditions
- Tolerates Input Transients up to 42V
- EN Pin Compatible up to 42V
- 8.2A/10A Typical Input Current Limit
- Fixed and Adjustable Output Voltage Options
- -40°C to +125°C Grade 1 Automotive Temperature Range
AEC-Q100 Qualified High Integration and Thermally Enhanced Package Reduces BOM Cost and Board Space
- Integrated FETs H-Bridge Architecture
- 2.1MHz/400kHz/200kHz Switching Frequency Options
- Phase-Locked Loop (PLL) Frequency Synchronization
- Thermally Enhanced, 22-Pin and 18-Pin FC2QFN Packages
Low Quiescent Current Meets Stringent OEM Current Requirements
- 95μA Quiescent Current in Standby Mode
- 10μA Maximum Shutdown Current
Reduced EMI Emissions at Switching Frequency
- Spread-Spectrum Function Enabled/Disabled by SPS Pin
Protection Features Improve System Reliability
- Supply Undervoltage Lockout and Thermal Protection
- Output PGOOD Indicator, Overvoltage, and Short-Circuit Protection

The MAX25239/MAX25240 are small, synchronous, buck-boost converters with integrated H-bridge switches. These ICs provide a fixed-output regulation voltage and an externally adjustable output voltage in the 3V to 20V range with an input voltage above, below, or equal to the output regulation voltage. The ICs have typical 8.2A and 10A input current limit options and can support continuous load currents up to 6A depending on the input-to-output voltage ratio and operating frequency. It also has a wide input voltage range of 2V to 36V.

The MAX25239/MAX25240 have three switching frequency options: 2.1MHz, 400kHz, and 200kHz. The 2.1MHz high switching frequency allows small external components and reduced output ripple, and guarantees no AM band interference, while the 400kHz or 200kHz switching frequency offers better efficiency and relieves the power consumption concern. The SYNC input allows three operation modes: skip mode with ultra-low quiescent current, forced fixed-frequency PWM operation, and synchronization to an external clock. The IC also includes spread-spectrum frequency modulation to minimize EMI interference.

The MAX25239/MAX25240 feature a power-OK (POK) indicator, undervoltage lockout, overvoltage protection, cycle-by-cycle current limit, and thermal shutdown. The ICs are available in a small, 4.25mm x 4.25mm x 0.75mm, 22-pin FC2QFN and 5.00mm x 5.00mm x 0.75mm, 18-pin FCQFN packages.

Applications

ADAS ECU
Body Electronics
Infotainment Systems
Point-of-Load Power Supplies
Start-Stop Systems

Part Models: 6
1ku List Price: Starting From $3.10

Documentation

Data Sheet 1

MAX25239-MAX25240: Automotive 2V to 36V, 6A Buck-Boost Converters Data Sheet (Rev.11) 09/18/2024

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
MAX25239AFFA/VY+	22-LFCSP_SS-4.25X4.25X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX25239AFFA/VY+T	22-LFCSP_SS-4.25X4.25X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX25239AFFB/VY+	22-LFCSP_SS-4.25X4.25X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX25239AFFB/VY+T	22-LFCSP_SS-4.25X4.25X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX25239AFFD/VY+	22-LFCSP_SS-4.25X4.25X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX25239AFFD/VY+T	22-LFCSP_SS-4.25X4.25X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Jun 27, 2025 - 2426A MECHANICAL DATASHEET
		pcn_2426a
MAX25239AFFA/VY+	PRODUCTION
MAX25239AFFA/VY+T	PRODUCTION
MAX25239AFFB/VY+	PRODUCTION
MAX25239AFFB/VY+T	PRODUCTION
MAX25239AFFD/VY+	PRODUCTION
MAX25239AFFD/VY+T	PRODUCTION
Jan 10, 2023 - 2318 DESIGN
		pcn_2318
MAX25239AFFA/VY+	PRODUCTION
MAX25239AFFA/VY+T	PRODUCTION
MAX25239AFFB/VY+	PRODUCTION
MAX25239AFFB/VY+T	PRODUCTION
MAX25239AFFD/VY+	PRODUCTION

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

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Switching Regulators & Controllers 3
MAX20039	RECOMMENDED FOR NEW DESIGNS	Automotive, 2V to 36V, 2.2MHz, 0.6A/1.2A Buck-Boost Converters with Integrated H-Bridge Architecture
MAX20040	RECOMMENDED FOR NEW DESIGNS	Automotive, 2V to 36V, 2.2MHz, 0.6A/1.2A Buck-Boost Converters with Integrated H-Bridge Architecture
MAX20048	PRODUCTION	Automotive 40V, 55µA I_Q, 2.2MHz, H-Bridge Buck-Boost Controller

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 MAX25239, MAX25240

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Features and Benefits

High-Voltage Step-Down Converters with Integrated
Power FETs to Minimize Board-Area-Occupancy
Seamless Transition Across buck and Boost Operating Regions
4.5V to 40V Input Supply Range
Extended Input Range Down to 2V After Initial Startup
Provides 11.5V Output Up to 4.5A Output Current
Output Voltages Adjustable Between 3.3V and 20V Through External Resistors
±2% Output Voltage Accuracy
Skip-Mode Operation to Maximize Efficiency During Light Load Conditions
Frequency-Synchronization Input
Spread Spectrum Enable Input
Buck-Boost Enable Input
Voltage-Monitoring PGOOD Output
Jumpers and Test Points on Key Nodes for Simplified Evaluation
Proven PCB Layout
Fully Assembled and Tested

Product Details

The MAX25240 evaluation kit (EV kit) is a fully assembled and tested application circuit that simplifies the evaluation of the MAX25240 400MkHz, 36V buck-boost converter. All installed components are rated for the automotive temperature range. Various test points and jumpers are included for evaluation.

The standard EV kit comes with the MAX25240AFFF/VY+ installed (11.5V, 400kHz) and can also be used to evaluate other MAX25240 variants with minimal component changes shown in the MAX25240 EV Kit Bill of Materials.