Click here for production status of specific part numbers. Evaluates: MAX22505 MAX22505 Evalution Kit General Description Features The MAX22505 evaluation kit (EV kit) is a fully assembled Derives Power From a USB Host and tested circuit board that evaluates the MAX22505 Proven PCB Layout 40V USB port protector. Fully Assembled and Tested The EV kit consists of 3 independent sections: A high- power peripheral section, a low-power peripheral section, and a high-power host section. Each section demonstrates protecting a USB bus from overvoltage conditions on the Ordering Information appears at end of data sheet. USB lines. The high-power peripheral section adds external MOSFET switches to the low-power peripheral circuit, reducing losses to power delivered to the peripheral. The EV kit powers completely from the USB host, such as a laptop, and requires no other power source. For peripheral applications, an isolated supply is offered for convenience but is not necessary in customer applications. Test access points are provided to optionally power each circuit section externally. 319-100172 Rev 0 4/18Evaluates: MAX22505 MAX22505 Evalution Kit A MAX258 (U2, U102) transformer driver feeds power to Quick Start an isolation transformer (T1, T101), through to a MAX8719 Recommended Equipment (U3, U103) LDO, providing an isolated 5 volts for the MAX22505 EV kit MAX22505. Laptop with USB port An indicator (LED2, LED102, LED202) illuminates green when power is supplied to the corresponding MAX22505 Standard USB cable (A to B) EV kit section. High-speed USB peripheral, such as a thumb drive To provide external power to the high power peripheral Procedure section, move jumper JU3 to the 1-2 position, and provide The EV kit is fully assembled and tested. Follow the steps isolated 5 volts between TP6 (EXT 5V) and TP7 (GND). below to verify board operation before exercising the full To provide external power to the low power peripheral features of the device: section, move jumper JU103 to the 1-2 position, and 1) Verify that all the jumpers are in their default positions, provide isolated 5 volts between TP106 (EXT 5V) and TP107 (GND). as shown in Table 1. To provide external power to the protected host section, 2) Using a USB cable, connect a laptop USB port to P1. move jumper JU202 to the 2-3 position, and provide 5 volts 3) Connect a thumb drive to P2. between TP208 (EXT 5V) and TP203 (GND). 4) Verify that the laptop detects the thumb drive. Transfer Fault Indicator LED a file to or from the thumb drive. The FLTB open-drain output assserts active low when 5) Repeat steps 2 through 4, connecting the laptop to any overvoltage could be presented to the protected side P101 and the thumb drive to P102. (PVBUS, PDP, PDN, GND). 6) Repeat steps 2 through 4, connecting the laptop to Should this occur, a FAULT indicator illuminates red (LED3, P202 and the thumb drive to P201. LED103, LED203) until the overvoltage is removed. Detailed Description High Common Mode Indicator LED The HCMB open-drain output asserts active-low when a The MAX22505 EV kit is a fully tested circuit board high common mode voltage is present which has caused demonstrating the capabilities of the MAX22505 40V the MAX22505 to force USB traffic to full-speed mode. USB port protector. Should this occur, an HCMB indicator illuminates red On-Board Isolated Power (LED1, LED101, LED201). The supply power for the MAX22505 shares the same The MAX22505 EV kit defaults to high-speed fallback power domain as the protected side signals. For this enabled. To disable this feature, short the appropriate reason, to obtain supply power from the host side, an jumper (JU1, JU101, JU201) before power-up for the isolated supply circuit must be used in the case of the MAX22505 EV kit. In this case, the corresponding HCMB protected peripherals. LED will remain illuminated until the jumper short is removed. Maxim Integrated 2 www.maximintegrated.com