Evaluates: MAX15068 MAX15068 Evaluation Kit General Description Quick Start The MAX15068 evaluation kit (EV kit) provides a proven Required Equipment design to evaluate the MAX15068 dual ORing, single hot- MAX15068 EV kit swap controller. The EV kit operates from a 4.8V to 18V Two 4.8V to 18V DC power supplies (PS1, PS2) range and provides a solution for evaluating two input supply rail applications requiring the safe insertion and Voltmeter removal of circuit line cards from a live backplane. Each Procedure rail has an individual ideal diode and is connected to the The EV kit is fully assembled and tested. Follow the steps load through a single hot-swap MOSFET. The EV kit below to verify board operation. Caution: Do not turn on uses the MAX15068ATP+ in a 4mm x 5mm, 20-pin TQFN the power supply until all connections are completed. package on a proven four-layer PCB design. 1) Verify that a shunt is installed across jumper JP1. Features and Benefits 2) Verify that a shunt is installed across pins 1-2 on 4.8V to 18V Operating Voltage Range jumper JP2. Banana Jacks for Input and Output Voltage 3) Turn on power-supply PS1 and set the supply to 12V, Current Monitoring then disable the power supply. Programmable Slew-Rate Control 4) Turn on power-supply PS2 and set the supply to 12V, then disable the power supply. Selectable Circuit-Breaker Threshold 5) Connect the positive terminal of power-supply PS1 to Configurable Undervoltage Lockout the IN1 banana jack on the EV kit. Connect the negative Adjustable Current-Limit Fault Delay terminal of the power supply to the GND banana jack. FAULT and PG Outputs 6) Connect the positive terminal of power-supply PS2 to Enable Input the IN2 banana jack on the EV kit. Connect the negative terminal of the power supply to the GND banana jack. Proven PCB Layout 7) Enable the power supplies. Fully Assembled and Tested 8) Verify that the voltage between the OUT and GND banana jacks is 12V. 9) The EV kit is now ready for additional evaluation. Ordering Information appears at end of data sheet. 19-6895 Rev 1 10/19Evaluates: MAX15068 MAX15068 Evaluation Kit ON Control Input Detailed Description of Hardware Jumper JP3 controls the ON input of the device. By The MAX15068 EV kit provides a proven design to installing a shunt on JP3, the CSP node connects to the evaluate the MAX15068 dual ORing, single hot-swap ON pin through resistive divider R3/R4. A rising edge controller. The EV kit can be easily connected between above 1.235V on the ON pin turns on the external hot- two system power inputs and the load using the banana swap MOSFET and a falling edge below 1.155V turns it jacks provided for the input and output. PCB pads are off. If no shunt is installed across JP3, the ON pin is pulled provided to monitor and control the device signals. The to GND through resistor R3 and the EV kit is disabled. EV kit operates between 4.8V and 18V. See Table 3 and the Undervoltage Lockout section for Enable Input (EN) JP3 settings. The devices enable input is controlled by jumper JP1. Circuit Breaker (CB) If a shunt is installed across JP1, a 10A current source The device features a programmable current limit with pulls the EN pin up to a diode drop below V and the S a circuit-breaker function that protects the external MOSFETs are not allowed to turn on. With this setting, a MOSFETs against short circuits or excessive load current. test point (EN) is also provided to drive the EN pin. If no The voltage across external sense resistor R51 is monitored shunt is installed across jumper JP1, the EN pin is forced by an electronic circuit breaker and active current-limit to GND and hot-swap control is enabled. See Table 1 for amplifier. Jumper JP4 sets the current-limit threshold for JP1 settings. the internal circuit breaker (CB) of the device. See Table Priority Control Input (PC) 4 for JP4 settings. The device features a priority control input pin to give Timer Capacitor (CDLY) priority to IN1 when the IN1 and IN2 supplies are equal. Capacitor C4 is used to set the time-out delay for current To enable priority control for IN1, set JP2 to pins 2-3 to limit before the external hot-swap MOSFET is turned off at connect the IN1 supply to a resistive divider to the PC pin a rate of 12ms/F, with the duration of the off time set at of the device. To disable IN1 priority control and allow the 617msec/F. As configured, the EV kit has a current-limit IN2 ideal diode controller to operate normally, connect delay of 1.2ms and a turn-off time of 61.7ms. JP2 to pins 1-2 to connect the PC pin to GND. See Table 2 for JP2 settings. Table 3. JP3 Jumper Selection (ON) SHUNT Table 1. JP1 Jumper Selection (EN) ON PIN UVLO POSITION SHUNT HOT-SWAP EN PIN Connected to CSP Configured through POSITION CONTROL Installed* through resistive R3/R4 resistive Installed* Connected to GND Enabled divider R3/R4 divider Disabled unless Not Connected to GND Not installed Internal 10A pullup EV kit disabled driven low externally installed through R3 *Default position. *Default position. Table 2. JP2 Jumper Selection (PC) Table 4. JP4 Jumper Selection (CB) SHUNT CB PIN CIRCUIT BREAKER SHUNT IN1 PRIORITY ON PIN POSITION CONNECTED TO THRESHOLD (mV) POSITION CONTROL 1-2* VS 65 1-2 Connected to GND Disabled Not connected Open 50 Connected to IN1 through 2-3* Enabled resistor-divider R7/R8 2-3 GND 35 *Default position. *Default position. Maxim Integrated 2 www.maximintegrated.com