Click here for production status of specific part numbers. Evaluates: MAX25400 MAX25400 Evaluation Kit General Description Quick Start The MAX25400 evaluation kit (EV kit) demonstrates Required Equipment the MAX25400 automotive Hi-Speed USB 2.0 protector MAX25400 EV kit switch IC, featuring overvoltage protection (OVP), elec- 5V, 2A DC power supply (Supply A) trostatic discharge (ESD) protection, and undervoltage lockout (UVLO) for automotive USB applications. 18V, 2A DC power supply (Supply B) The device protects the D+ and D- data lines from over- Logic function generator voltage conditions, such as a short-to-battery and ESD Oscilloscope events. All faults can be monitored using the FAULT output signal. Procedure The device can pass high-speed USB differential (D+ and The EV kit is fully assembled and tested. Use the fol- D-) signals up to 480Mbps using low 3.3 R (typ) data ON lowing steps to verify board operation. Caution: Do not switches. The EV kit is powered by the USB BUS. An on- turn on the power supplies until all connections are board MAX15007A automotive regulator provides the IN completed. reference voltage. 1) Verify that the following shunt is installed: J1: Pins 1-2 (IN connected to on-board 3.3V Features reference) Protects D+ and D- Signals from Overvoltages Up to 2) Set the Supply A output to 5V and disable the output. 18V and ESD Events 3) Set the logic function generator as follows: 3V , P-P USB BUS Undervoltage Lockout 1.5V DC offset square wave, 500kHz, and disable the Passes 480Mbps USB Data Signals output. Low On-Resistance 4) Connect the Supply A positive output to the VBUS test D+ and D-: 3.3 (typ) point on the EV kit and connect the supply ground to the GND wire loop. FAULT Output Signal 5) Using a Type A USB receptacle inserted into J3, USB Powered connect the logic function generator to D+ and GND. Fully Assembled and Tested 6) Enable the power-supply. Evaluates the MAX25400 IC in a 12-Pin TQFN 7) Enable the function generator output. Package 8) Use the oscilloscope to probe the HVD+ test point. 9) Verify that the part is powered and that the waveform on HVD+ is a 500kHz square wave and is approxi- mately 3V . P-P 10) Momentarily touch the HVD+ or HVD- test point on Ordering Information appears at end of data sheet. the EV kit with the voltage probe from the Supply B positive output. The FAULT signal asserts a logic-low while the fault is present. 319-100557 Rev 0 6/20Evaluates: MAX25400 MAX25400 Evaluation Kit Jumper Settings Detailed Description of Hardware The MAX25400 EV kit demonstrates the MAX25400 auto- IN Reference Voltage Selection (J1) motive Hi-Speed USB 2.0 protector switch IC, featuring Jumper JU1 on the EV kit selects the reference voltage OVP, ESD protection, and UVLO protection for automo- for the devices IN pin. IN can either be supplied by the tive USB applications. USB BUS through the on-board automotive 3.3V regula- The IC protects the D+ and D- data lines from overvolt- tor (U2, MAX15007A), or by a user-supplied reference age conditions, such as a short-to-battery up to 18V and voltage. Test points EXT IN and GND are provided to ESD events up to 25kV (air) and 8kV (contact). The OVP supply the device with an external 3V to 3.6V reference feature protects the D+ and D- lines against high-voltage voltage. See Table 1 for proper J1 jumper settings. conditions such as a short-to-BUS. The UVLO feature insures the externally powered VBUS is valid before turn- Table 1. MAX25400 IN Reference Voltage ing the data switches on. All faults can be monitored using Selection (J1) the FAULT PCB pad, pulled up to IN through resistor R1. The device can pass high-speed USB differential (D+ and SHUNT POSITION IN PIN D-) signals up to 480Mbps, and a 3.3 R (typ) for the ON 1-2 Connected to on-board LDO D+ and D- data lines. The EV kit is powered by the USB 2-3 Connected to IN test point BUS. The 3.3V automotive regulator (U2, MAX15007A) provides an on-board IN reference voltage. A user can Not installed Unconnected provide a 3V to 3.6V IN reference voltage across the VIN and GND PCB pads. The MAX25400 (U1) ICs automo- Ordering Information tive operating temperature range is from -40C to +105C. PART TYPE MAX25400EVKIT EV Kit Denotes RoHS compliance. Maxim Integrated 2 www.maximintegrated.com