MAX42405

RECOMMENDED FOR NEW DESIGNS

36V, 5A/6A Fully Integrated Synchronous Buck Converters

Data Sheet (Rev. 2) Product Selection Table

Part Models: 4
1ku List Price: Starting From $1.29

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Overview

Multiple Functions for Small Size
- Operating V_IN Range of 4.5V to 36V
- 20μA Quiescent Current in Skip Mode
- Synchronous DC-DC Converter with Integrated Field-Effect Transistors (FETs)
- 400kHz and 1.5MHz Fixed-Frequency Options
- Internal Soft-Start
  - 2.5ms for 400kHz
  - 3.5ms for 1.5MHz
- Programmable Output Voltage
  - 0.8V to 12V for 400kHz
  - 0.8V to 10V for 1.5MHz
- 3.5mm x 3.75mm, 17-Pin FC2QFN
- Symmetrical Package Offers Superior Electromagnetic interference (EMI) Performance

Dual Phase Capability
- Can Be Used in Dual-Phase Configuration for High-Power Design
- Dynamic Current Sharing through Shared VEA Pin
- Low-I_Q Operation Capability in Dual Phase
Precise Output Voltage Monitoring with PGOOD
Forced–Pulse-Width Modulation (PWM) and Skip-Mode Operation
Low Dropout Operation
Overtemperature and Short-Circuit Protection
-40°C to +125°C Operating Temperature Range

The MAX42405/MAX42406 ICs are tiny synchronous buck converters with integrated high-side and low-side switches. The ICs are designed to deliver up to 6A with wide input voltages ranging from 4.5V to 36V. Voltage quality can be monitored by observing the PGOOD signal. The ICs can operate in dropout by running at a very high duty cycle, making it ideal for industrial applications.

The MAX42405/MAX42406 ICs offer programmable output voltage. Frequency is internally fixed at 400kHz and 1.5MHz, which allows for small external components and reduced output ripple. The ICs automatically enter skip mode at light loads with ultra-low quiescent current of 20μA at no load. This family of products (including the MAX42408/MAX42410) offers a pin-to-pin compatible offering from 5A to 10A in a single-phase configuration, and up to 20A in a dual-phase configuration. These devices are also optimized for dual-phase operation with very high current-sharing accuracy.

The MAX42405/MAX42406 ICs are available in a small 3.5mm x 3.75mm, 17-pin flip-chip quad flat no lead (FC2QFN) package and use very few external components.

APPLICATIONS

Industrial Automation
Point-of-Load
Distributed DC Power Systems

Part Models: 4
1ku List Price: Starting From $1.29

Documentation

Data Sheet 1

MAX42405-MAX42406: 36V, 5A/6A Fully Integrated Synchronous Buck Converters Data Sheet (Rev.2) 01/12/2024

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
MAX42405AFOA+	17 LD, FC2QFN 3.5X3.75X	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX42405AFOA+T	17 LD, FC2QFN 3.5X3.75X	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX42405AFOB+	17 LD, FC2QFN 3.5X3.75X	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX42405AFOB+T	17 LD, FC2QFN 3.5X3.75X	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 MAX42405/MAX42406

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Features and Benefits

Input Supply Range from 4.5V to 36V
Adjustable from 0.8 to 10V
Delivers up to 6A
Frequency - Synchronization Input
Enable Input
Voltage Monitoring PGOOD Output Available
Proven PCB Layout
Fully Assembled and Tested

Product Details

The MAX42406 evaluation kit (EV kit) provides a proven design to evaluate the MAX42406 1.5MHz synchronous buck converter with 10μA quiescent current. The standard EV kit Printed Circuit Board (PCB) comes with a MAX42406AFOB+ (1.5MHz, adjustable output) installed, as well as various test points and jumpers for evaluation. The EV kit output voltage is fixed and easily configured with minimum component changes. The default EV kit is designed to deliver up to 6A with an input voltage of 4.5V to 36V. Output voltage quality can be monitored by observing the PGOOD signal. The MAX42406 EV kit can also be used to evaluate all variants of the MAX42405 and MAX42406.

Resources

MAX42406EVKIT: Evaluation Kit for MAX42405/MAX42406 User Guide (Rev.0)
11/20/2023

MAX42406EVKIT Gerber Files
11/20/2023

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