Click here for production status of specific part numbers. Evaluates: MAX20463A MAX20463A Evaluation Kit MAX20463A is an automotive USB protector that inte- General Description grates USB shield short-to-battery protection. A short cir- The MAX20463A evaluation kit (EV kit) demonstrates the cuit from the USB shield to the car battery can occur when MAX20463A a small, integrated USB Type-C solution a customers portable device cable is connected to the for automotive radio, navigation, connectivity, and USB vehicle Type-C receptacle, and the far end of this cable head units and infotainment applications. The device falls into the 12V cigarette lighter (accessory port) con- provides a one-chip solution to convert an existing down- tacting the 12V center terminal. This situation can result stream-facing port from supporting the USB-A connector in a damaging amount of current flow through the USB to supporting the USB Type-C connector. cable, and can cause cable combustion if the cigarette- The device features an integrated USB Type-C interface lighter fuse response time is insufficient. MAX20463A to control the new configuration channel (CC) pins found is designed to sense this condition (shield shorted to in the USB Type-C connector. It supports the downstream- battery) with the SENSE pin and control an N-channel facing port (DFP) role and supports V current limits BUS MOSFET with the GDRV pin to stop the flow of current. including 1.5A and 3.0A. The MAX20463A can coexist The device and EV kit operate from a VBUS voltage of with BC1.2 and Apple charging technologies, as these are 4.75V to 7V. controlled by the host emulator in the upstream module. The EV Kit enables testing and configuration of the An integrated high-side power switch protects the device MAX20463As CC current advertisement behavior. against faults and allows most fault conditions to be The device provides a CC SEL pin for this purpose. detected and handled by the upstream 5V power sup- Connecting the CC SEL pin to BIAS or GND through ply. This avoids possible contention, in which both the jumper J6 selects between the two different current levels upstream 5V power supply and the MAX20463A detect (refer to Table 1). the same fault and simultaneously try to resolve it. The EV kit is configured for 3A output operation and the The BIAS circuitry provides a solution to the transient included three-meter USB cable allows for demonstration conditions seen in automotive USB charging applications. of use with an upstream-voltage-compensated power The device is designed to stay powered on during the CC supply such as MAX16984, MAX16987, MAX20037, or attach process even if V droops due to an overcurrent, BUS MAX20038. or other low voltage condition, for a short period of time. The period of time that the part can stay powered on can be con- Features and Benefits figured by the module design engineer to provide the time Configurable Charge Detection Modes: required for the upstream 5V power supply to detect and USB-C 3.0A, 1.5A handle the fault. The device stay-on time is determined by the amount of capacitance on BIAS, which must be at least High-Side USB Power-Protection Switch 22F, but can be increased above this value. The device Proven PCB Layout and its solution circuit are designed to conform to the USB- Fully Assembled and Tested IF specification for short-to-ground response. Ordering Information appears at end of data sheet. 319-100520 Rev 0 3/20Evaluates: MAX20463A MAX20463A Evaluation Kit 6) Connect PS1 (turned off) between the V and BAT Quick Start GND test points on MAX20037. The following procedure demonstrates the MAX20463As 7) Connect 3m USB captive cable from MAX20037 to capability and EV Kit in use with a MAX20037 EV kit. MAX20463A. Required Equipment 8) Connect DVM 1 (or oscilloscope channel 1) between MAX20463A EV Kit the USB 5V and GND test points of the MAX20037 MAX20037 or MAX20038 EV Kit EV kit (this is the output of the buck). Included 3m USB Captive Cable 9) Connect DVM 2 (or oscilloscope channel 2) to HVBUS and GND on the MAX20463A EV kit (this is 2, 20W Resistor or Electronic Load Connected to a the voltage that a portable device will see). USB Type-C Connector (Plug) 10) Power on PS1 at 12.5V with a 2A current limit. 12.5V, 4A DC Power Supply (PS1) 11) Both DVM 1 and DVM 2 should measure approxi- 3.3V/1A DC Power Supply (PS2) mately 5V. Variable 9V to 18V, 4A DC Power Supply or 2 12) Establish I C communication to the GUI. 12V Car Battery (PS3) b. Open the MAX20037 GUI look at the message 2 Digital Voltmeters (DVM) or 1 Oscilloscope bar at the bottom of the GUI to verify that both MINIQUSB and MAX20037 GUI the MINIQUSB and the EV kit are connected. 4x 0.1-Header Jumper Leads a. Click Auto Read. The output voltage and current should begin to update periodically. USB Type-A to Type-B Cable Note: In the following sections, software-related items are iden- 13) Connect the load to the USB Type-C connector on tified by bolding. Text in bold refers to items from the EV kit the MAX20463A EV kit. software. Text in bold and underlined refers to items from the If the load is connected to HVBUS/GND rather Windows operating system. than the Type-C connection, HVBUS will not be Initial Setup enabled. To enable HVBUS, set SW1 1 -or- 3 The EV kit is fully assembled and tested. Perform the to ON, and all other positions off. following steps to verify board operation: 14) With the voltage adjustment disabled in the GUI 1) Verfiy that MAX20037 GUI is installed. (Gain = 0 default setting), measure the volt- age. The voltage at the buck output should still be 2) Verify SW1 switch is set to HVEN = 1, ENBUCK = 1, approximately 5V. There will be a slight drop due SYNC = 0, CDP/DCP = 0. to the current through the SENSE resistor, output 3) Using the jumper wires, connect the MINIQUSB to filter, and PCB trace. The voltage at the SENSP pin the MAX20037 EV kit as follows: should be constant, regardless of current. V to 3V3 DD 15) Click the + button or type directly into the Gain box SCL to SCL in the GUI to set the gain to 533. SDA to SDA 16) The voltage at the buck output should increase to GND to GND 6.3V, and the voltage at the end of the USB Type-C 4) Connect the MINIQUSB+ to the computer. connector should now be about 5.2V. 5) Verify the MINIQUSB+ is recognized in the Win- dows Device Manager as USB Serial Converter. Maxim Integrated 2 www.maximintegrated.com