MAX25460

NOT RECOMMENDED FOR NEW DESIGNS

Automotive 1.5A Step-Down Converter with USB Protection/Host Charger Adapter Emulator

Data Sheet (Rev. 0) Product Selection Table

Part Models: 2
1ku List Price: Starting From $0.84

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Overview

One-Chip Type-A Solution Directly from Car Battery to Portable Device
- 1GHz Bandwidth USB 2.0 Data Switches
- 4.5V to 28V (40V Load Dump) Operating Voltage
- 5V to 6V, 1.5A Output Capability
Optimal USB Charging and Communication for Portable Devices
- User-Programmable Voltage Gain Adjusts Output for Up to 474mΩ Cable Resistance
- User-Programmable USB Current Limit
- Supports USB BC1.2 CDP and SDP Modes
- Compatible with USB On-the-Go Specification and Apple CarPlay^®
Low-Noise Features Prevent Interference with AM Band and Portable Devices
- Fixed-Frequency 2.2MHz Operation
- Fixed-Pulse-Width Modulation (PWM) Option at No Load
- Spread Spectrum for Electromagnetic Interference (EMI) Reduction
- SYNC Input/Output for Frequency Parking

Robust Design Keeps Vehicle System and Portable Device Safe in an Automotive Environment
- Short-to-Battery Protection on V_BUS, HVD± Pins
- Advanced Diagnostics through I²C Bus
- ±15kV Air/±8kV Contact ISO 10605 (330pF, 2kΩ)*
- ±15kV Air/±8kV Contact IEC
- 61000-4-2 (150pF, 330Ω)*
- Overtemperature Protection and Warning
- -40°C to +125°C Operating Temperature Range

The MAX25460 combines a 1.5A high-efficiency, automotive-grade, step-down converter, a USB BC1.2 host charger emulator, and high-bandwidth USB protection switches for automotive USB 2.0 host applications. The device also includes a USB load current-sense amplifier and a configurable feedback adjustment circuit that provides automatic USB voltage compensation for voltage drops in captive cables often found in automotive applications. The device limits the USB load current using both a fixed internal peak-current threshold and a user-configurable external current-sense USB load threshold.

The MAX25460 is optimized for 2.2MHz operation allowing optimization of efficiency, noise, and board space based on the application requirements. The DC-DC converter integrates a high-side MOSFET and uses a low forward-drop freewheeling Schottky diode for rectification. There is a small low-side n-channel switch to maintain fixed frequency under light loads. The IC includes an external SYNC input/output, and can be configured for spread-spectrum operation. The MAX25460 allows flexible configuration and advanced diagnostic options for both standalone and supervised applications. The device can be programmed using either external programming resistors and/or internal I²C registers through the I²C bus.

The MAX25460 is available in a small 4mm x 5mm 24-pin TQFN package and is designed to minimize required external components and layout area.

APPLICATIONS

Automotive Radio and Navigation
USB Port for Host and Hub Applications
Automotive Connectivity/Telematics

Part Models: 2
1ku List Price: Starting From $0.84

Documentation

Data Sheet 1

MAX25460: Automotive 1.5A Step-Down Converter with USB Protection/Host Charger Adapter Emulator Data Sheet (Rev.0) 06/30/2023

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
MAX25460ATGA/V+	24-LFCSP-4X5X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX25460ATGA/V+T	24-LFCSP-4X5X0.75	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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Evaluation Kits

Evaluation Kit for MAX25460

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Features and Benefits

Configurable Charge Detection Modes
- USB-IF BC1.2 SDP, CDP
Automatic USB Voltage Adjustment by Integrated DC-DC Converter
Proven PCB Layout
Fully Assembled and Tested

Product Details

This evaluation kit (EV kit) demonstrates the MAX25460 automotive USB Type-A controller with 1GHz BW USB 2.0 D+/D- protection switches. The MAX25460 features a high-current, high-efficiency, host-charger with portdetection circuitry adhering to the USB 2.0 and the USBIF BC1.2 battery charging specifications. The step-down DC-DC converter operates from up to 28V continuous and protects against load dump transients up to 40V. The converter switches at 2.2MHz and can deliver 1.5A continuously and 2.4A for up to 1.1ms. The MAX25460 integrates high-side current sensing and circuitry to automatically adjust the USB voltage to compensate for voltage drops in long automotive cables.

The EV kit is populated with a MAX25460ATGA/V+ product variant for 2.2MHz operation. The high-speed data switches of the MAX25460 generally do not require far-end eye tuning, so the EV kit is populated with 0Ω resistors in place of the LC turning circuits.

The EV kit allows evaluation of the following MAX25460 capabilities:

Adjustable buck converter precision current limit for better system performance.
Adjustable current limit debounce timer for overcurrent testing and system flexibility.
Adjustable gain settings for cable compensation for low-cost captive cables up to 474mΩ.
Electromagnetic interference (EMI) mitigation using spread spectrum switching.
Detailed interrupt and fault status providing multilayer protection and recovery to improve system decisions during faults.

Resources

MAX25460EVKIT ODB Files
6/30/2023

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