MAX20046EVKIT#

Evaluates: MAX20046 MAX20046 Evaluation Kit General Description The MAX20046 evaluation kit (EV kit) demonstrates the MAX20046 automotive Hi-Speed USB 2.0 protector switch IC, featuring overvoltage protection (OVP), electrostatic discharge (ESD) protection, and undervoltage lockout (UVLO)/overcurrent protection (OCP) for automotive USB applications. The device protects the USB BUS, D+, and D- data lines from overvoltage conditions, such as a short-to-battery and ESD events. UVLO protects the BUS against lowvoltage conditions such as a short-to-ground. The BUS OCP uses a blanking period allowing momentary BUS shorts to be ignored. All faults can be monitored using the FAULT output signal. The device can pass high-speed USB differential (D+ and D-) signals up to 480Mbps and has a low 500mΩ RON (max) for the BUS and a 3.3Ω RON (typ) for the D+ and D- lines. The EV kit is powered by the USB BUS. An on-board MAX15007A automotive regulator provides the IN reference voltage. If a 60mA/120mA current threshold is desired, the MAX20046GTC/V+ can be ordered and interchanged with U1. Quick Start Required Equipment ● MAX20046 EV kit ● 5V, 2A DC power supply (Supply A) ● 18V, 2A DC power supply (Supply B) ● Logic function generator ● Oscilloscope Procedure The EV kit is fully assembled and tested. Follow the steps below to verify board operation. Caution: Do not turn on the power supplies until all connections are completed. 1) Verify that shunts are installed as follows: • JU1: Pins 1-2 (MAX20046 BUS switch disabled) • JU2: Pins 1-2 (IN connected to on-board 3.3V reference) 2) Set the Supply A output to 5V, the Supply B output to 18V, and disable both outputs. 3) Benefits and Features Set the logic function generator as follows: 3VP-P, 1.5V DC offset square wave, 500kHz, and disable the output. 4) Connect the Supply A positive output to the red BUS test point on the EV kit and connect the supply ground to the nearby black GND test point. ● USB BUS Undervoltage Lockout 5) Connect the Supply B ground to the GND test point close to the HVBUS test point on the EV kit. Connect a voltage probe test lead to the Supply B positive output for later use. 6) Using a Type A USB receptacle inserted into J3, connect the logic function generator to D+ and GND. 7) Enable both power-supply outputs. 8) Enable the function generator output. 9) Install a shunt on jumper JU1, pins 2-3 (MAX20046 BUS switch enabled). ● Protects USB BUS, D+, and D- Signals from Overvoltages Up to 18V and ESD Events ● 23mA/45mA (typ) USB BUS Overcurrent-Protection Threshold ● 1ms Overcurrent Blanking Time ● Passes 480Mbps USB Data Signals ● Low On-Resistance • BUS: 500mΩ (max) • D+ and D-: 3.3Ω (typ) ● FAULT Output Signal ● USB Powered ● Fully Assembled and Tested 10) Use the oscilloscope to probe the HVBUS and HVD+ test points. ● Evaluates the MAX20046 IC in a 12-Pin TQFN Package 11) Verify that HVBUS is 5V and that the waveform on HVD+ is a 500kHz square wave and is approximately 3VP-P. Ordering Information appears at end of data sheet. 19-8763; Rev 0; 1/17 12) Momentarily touch the HVBUS test point on 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. Evaluates: MAX20046 MAX20046 Evaluation Kit Detailed Description of Hardware that turns off the switch between HVBUS and BUS during an overvoltage on HVBUS; however, energy stored in the wiring inductance can cause the HVBUS node voltage to quickly increase. The RC snubber network limits the positive voltage spike caused by wiring inductance. The IC protects the USB BUS, D+, and D- data lines from overvoltage conditions, such as a short-to-battery up to 18V and ESD events up to 25kV (air) and 8kV (contact). The OVP feature protects the D+ and D- lines against high-voltage conditions such as a short-to-BUS. The UVLO feature protects the BUS line against low-voltage conditions such as a short-to-ground. The BUS OCP threshold is fixed at 23mA/45mA (typ). A 1ms blanking period allows momentary BUS shorts to be ignored, such as those created by hot-swapping a capacitive load. All faults can be monitored using the FAULT PCB pad, pulled up to IN through resistor R1. Jumper Settings The MAX20046 EV kit demonstrates the MAX20046 automotive Hi-Speed USB 2.0 protector switch IC, featuring OVP, ESD protection, UVLO protection, and OCP for automotive USB applications. The device can pass high-speed USB differential (D+ and D-) signals up to 480Mbps, and has a low 500mΩ RON (max) for BUS and a 3.3Ω RON (typ) for the D+ and Ddata lines. The EV kit is powered by the USB BUS. The 3.3V automotive regulator (U2, MAX15007A) provides an on- board IN reference voltage. A user can provide a 3V to 3.6V IN reference voltage across the VIN and GND PCB pads. The MAX20046 (U1) IC’s automotive operating temperature range is from -40°C to +105°C. Long USB wire lengths contribute to increased wiring inductance, resulting in slow di/dt and dV/dt during a “short to 18V” event. The device includes internal circuitry BUS Switch Enable (JU1) Jumper JU1 on the EV kit enables the device’s BUS switch. Test points EN and GND are provided to control U1’s enable signal with an external controller. Refer to the EN Input section in the Electrical Characteristics table in the MAX20046 IC data sheet for proper EN logic levels when using an external controller. See Table 1 for proper JU1 jumper settings. IN Reference Voltage Selection (JU2) Jumper JU2 on the EV kit selects the reference voltage for the device’s IN pin. IN can either be supplied by the USB BUS through the on-board automotive 3.3V regulator (U2, MAX15007A), or by a user-supplied reference voltage. Test points VIN and GND are provided to supply the device with an external 3V to 3.6V reference voltage. See Table 2 for proper JU2 jumper settings. ISET OCP Threshold Selection (JU3) Jumper JU3 on the EV kit selects the current threshold for OCP (overcurrent protection). With pins 1-2 shorted, the current threshold is 45mA. With pins 2-3 shorted, the current threshold is 23mA. See Table 3 for proper JU3 jumper settings. Table 1. MAX20046 Enable (JU1) SHUNT POSITION EN PIN BUS SWITCH 1-2 Connected to IN Disabled 2-3 Connected to GND Enabled Not installed Connected to EN PCB pad EN externally controlled Table 2. MAX20046 IN Reference Voltage Selection (JU2) SHUNT POSITION IN PIN 1-2 Connected to on-board LDO 2-3 Connected to IN test point Not installed Unconnected www.maximintegrated.com Maxim Integrated │  2 Evaluates: MAX20046 MAX20046 Evaluation Kit Table 3. MAX20046 EV Kit ISET OCP Threshold Selection (JU3) SHUNT POSITION ISET PIN CURRENT THRESHOLD 1-2 Connected to IN 45mA 2-3 Connected to GND 23mA Not installed Internal pulldown 23mA Ordering Information PART TYPE MAX20046EVKIT# EV Kit #Denotes RoHS compliant. MAX20046 EV Bill of Materials QTY REFERENCE DESCRIPTION MANUFACTURER MFG PART NO. 1 C1 0.1uF 0603 50V X7R 10% Murata GRM188R71H104KA93D 2 C2, C6 10uF 0805 25V X5R 20% Murata GRM219R61E106KA12D 2 C3, C4 1uF 0805 16V X7R 10% Murata GRM21BR71C105KA01K 10uF 0805 6.3V X7R 20% Murata GRM21BR70J106ME76L KYCON KUSBX-SMT-AS1N-B30 1 C8 4 C14 - C17 1 J1 1 J3 4 L4 - L7 3 JU1, JU2, JU3 5 EN, FAULT, GND, VIN 3 R1, R2, R3 1 OPEN USB A receptacle USB A plug KYCON KUSBX-SMT2AP5S-B30 0Ω Resistor 0402 Any (Yageo) RC0402JR-070RL 100 mil header TE Connectivity 4-103327-0 100k 0603 0.1W 5% KOA RK73B1JTTD104J R4 1Ω 0603 0.1W 1% Yageo RC0603FR-071RL 1 U1 USB Protection IC Maxim MAX20046GTCA/V+ 1 U2 3.3V Linear Voltage Regulator Maxim MAX15007AASA+ 1 — PCB: MAX20046 EVALUATION KIT# Maxim — www.maximintegrated.com Wire Loop (18 or 20 gauge wire) Maxim Integrated │  3 5 6 G ND D+ D- VBUS USB_A_F SHIELD SHIELD J1 4 3 2 1 TP4 C2 10uF R4 1 C15 O pen O pen C14 TP3 L5 Short L4 Short 2 1 10 C6 10uF C3 1uF BUS IN C1 0.1uF 4 10uF C8 6 IN 4 3 2 1 HVD- N.C. EN U1 U2 M AX20046 3 EP D- D+ 2 G ND N.C. N.C. 5 6 7 8 1 JU1 EN ISET N.C. FAULT M AX15007A O UT N.C. IN HVD+ HVBUS BUS G ND 12 EP www.maximintegrated.com 13 IN 100k R3 11 7 5 3 8 9 C4 1uF 1 JU2 2 3 100k R2 L6 Short L7 Short BUS IN 3 2 1 JU3 C17 O pen C16 O pen 100k R1 TP1 IN TP2 G ND VIN G ND EN FAULT IN 4 3 2 1 G ND D+ D- VBUS J3 SHIELD SHIELD 5 6 MAX20046 Evaluation Kit Evaluates: MAX20046 MAX20046 EV Kit Schematics Maxim Integrated │  4 MAX20046 Evaluation Kit Evaluates: MAX20046 MAX20046 EV Kit PCB Layouts MAX20046 EV Kit Component Placement Guide—Top www.maximintegrated.com Maxim Integrated │  5 MAX20046 Evaluation Kit Evaluates: MAX20046 MAX20046 EV Kit PCB Layouts (continued) MAX20046 EV Kit PCB Layout—Layer 2 www.maximintegrated.com Maxim Integrated │  6 MAX20046 Evaluation Kit Evaluates: MAX20046 MAX20046 EV Kit PCB Layouts (continued) MAX20046 EV Kit PCB Layout—Layer 3 www.maximintegrated.com Maxim Integrated │  7 MAX20046 Evaluation Kit Evaluates: MAX20046 MAX20046 EV Kit PCB Layouts (continued) MAX20046 EV Kit PCB Layout—Bottom www.maximintegrated.com Maxim Integrated │  8 MAX20046 Evaluation Kit Evaluates: MAX20046 MAX20046 EV Kit PCB Layouts (continued) MAX20046 EV Kit Component Placement Guide—Top Silkscreen www.maximintegrated.com Maxim Integrated │  9 MAX20046 Evaluation Kit Evaluates: MAX20046 MAX20046 EV Kit PCB Layouts (continued) MAX20046 EV Kit Component Placement Guide—Bottom Silkscreen www.maximintegrated.com Maxim Integrated │  10 Evaluates: MAX20046 MAX20046 Evaluation Kit Revision History REVISION NUMBER REVISION DATE 0 1/17 DESCRIPTION Initial release PAGES CHANGED — For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com. Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc. © 2017 Maxim Integrated Products, Inc. │  11