MAX25223

PRODUCTION

Automotive 36V 3.5A Buck Converter with 5μA I_Q

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

Data Sheet (Rev. 0) Product Selection Table

Part Models: 4
1ku List Price: Starting From $1.50

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Overview

Synchronous DC-DC Converter with Integrated FETs
- 3.5A Output-Current Capability
- 5μA Quiescent Current in Standby Mode
Small Solution Size Saves Space
- 65ns Minimum On-Time
- 2.1MHz or 400kHz Fixed Operating Frequency Options
- Fixed 5V / 3.3V V_OUT Options Available
- 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
- OV/UV Monitoring on PGOOD with High Accuracy
- Fully Programmable UVLO with Precise ENABLE Threshold
Protection Features and Operating Range Ideal for Automotive Applications
- 3V to 36V Operating V_IN Range
- 42V Load-Dump Protection
- Thermal Shutdown, Short Circuit Protection with Hiccup Mode and Output Overvoltage Protection
- 99% Duty-Cycle Operation with Low Dropout
- -40°C to +125°C Automotive Temperature Range
- AEC-Q100 Qualified

The MAX25223 is a small, automotive grade synchronous buck converter with integrated high-side and low-side switches. The device is designed to deliver up to 3.5A with input voltages from +3V to +36V while using only 5µA quiescent current at no load. The MAX25223 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. MAX25223 can operate in drop-out by running at 99% duty cycle, making it ideal for automotive and industrial applications. The IC offers standard parts with fixed output voltages of 3.3V and 5V. Other fixed output voltages in the range of 3V to 5.5V are also available on request. Frequency is internally fixed at 2.1MHz, which allows for small external components, reduces output ripple, and guarantees that there is no AM interference. A 400kHz option is also offered to provide minimum switching losses and maximum efficiency. MAX25223 automatically enters skip mode at light loads with ultra-low quiescent current of 5µA at no load. It offers pin-enabled spread-spectrum frequency modulation designed to minimize EMI-radiated emissions due to the modulation frequency.

The MAX25223 comes in a small 4mm x 4mm 20-pin SW-TQFN package and uses very few external components. The intelligent package layout results in an extremely low-noise solution with superior EMI performance.

Applications

Automotive
Industrial
High Voltage DC-DC Converters

Part Models: 4
1ku List Price: Starting From $1.50

Documentation

Data Sheet 1

MAX25223: Automotive 36V 3.5A Buck Converter with 5μA I_Q Data Sheet (Rev.0) 01/13/2022

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
MAX25223ATPA/VY+	20-LFCSP_SS-4X4X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX25223ATPA/VY+T	20-LFCSP_SS-4X4X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX25223ATPB/VY+	20-LFCSP_SS-4X4X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX25223ATPB/VY+T	20-LFCSP_SS-4X4X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

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 MAX25223

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Features and Benefits

3.5V to 36V Input Supply Range
5V or 3.3V Fixed Output Voltage
Delivers up to 3.5A Output Current
Frequency Synchronization Input
Enable Input
Voltage-Monitoring PGOOD Output with Overvoltage Feature
Proven PCB Layout
Fully Assembled and Tested

Product Details

The MAX25223 evaluation kit (EV kit) provides a proven design to evaluate the MAX25223 2.1MHz/400kHz highvoltage mini-buck converter in a 20-pin side-wettable TQFN (SW-TQFN) package. All components are rated for the automotive temperature range. Various test points and jumpers are included for evaluation.

The MAX25223 EV kit comes with the MAX25223ATPA/VY+ installed (5V, 2.1MHz) and can be used to evaluate any MAX25223 variant with minimal component changes.