MAX20463AEVKIT

Product Details

The MAX20463A evaluation kit (EV kit) demonstrates the MAX20463A; a small, integrated USB Type-C™ solution for automotive radio, navigation, connectivity, and USB head units and infotainment applications. The device provides a one-chip solution to convert an existing downstream- facing port from supporting the USB-A connector to supporting the USB Type-C connector.

The device features an integrated USB Type-C interface to control the new configuration channel (CC) pins found in the USB Type-C connector. It supports the downstreamfacing port (DFP) role and supports V_BUS current limits including 1.5A and 3.0A. The MAX20463A can coexist with BC1.2 and Apple charging technologies, as these are controlled by the host emulator in the upstream module.

An integrated high-side power switch protects the device against faults and allows most fault conditions to be detected and handled by the upstream 5V power supply. This avoids possible contention, in which both the upstream 5V power supply and the MAX20463A detect the same fault and simultaneously try to resolve it.

The BIAS circuitry provides a solution to the transient conditions seen in automotive USB charging applications. The device is designed to stay powered on during the CC attach process even if V_BUS droops due to an overcurrent, or other low voltage condition, for a short period of time. The period of time that the part can stay powered on can be configured by the module design engineer to provide the time required for the upstream 5V power supply to detect and handle the fault. The device stay-on time is determined by the amount of capacitance on BIAS, which must be at least 22μF, but can be increased above this value. The device and its solution circuit are designed to conform to the USBIF specification for short-to-ground response.

MAX20463A is an automotive USB protector that integrates USB shield short-to-battery protection. A short circuit from the USB shield to the car battery can occur when a customer’s portable device cable is connected to the vehicle Type-C receptacle, and the far end of this cable falls into the 12V cigarette lighter (accessory port) contacting the 12V center terminal. This situation can result in a damaging amount of current flow through the USB cable, and can cause cable combustion if the cigarettelighter fuse response time is insufficient. MAX20463A is designed to sense this condition (shield shorted to battery) with the SENSE pin and control an N-channel MOSFET with the GDRV pin to stop the flow of current.

The device and EV kit operate from a VBUS voltage of 4.75V to 7V.

The EV Kit enables testing and configuration of the MAX20463A’s CC current advertisement behavior. The device provides a CC_SEL pin for this purpose. Connecting the CC_SEL pin to BIAS or GND through jumper J6 selects between the two different current levels (refer to Table 1)

The EV kit is configured for 3A output operation and the included three-meter USB cable allows for demonstration of use with an upstream-voltage-compensated power supply such as MAX16984, MAX16987, MAX20037, or MAX20038.

Applications

• Automotive Downstream USB Modules
• Automotive USB Captive-Cable Housing