MAX20044EVKIT#

Evaluates: MAX20042F/ MAX20043F/MAX20044F MAX20044F Evaluation Kit General Description The MAX20044F evaluation kit (EV kit) circuit demonstrates the MAX20044F automotive USB protector switch IC, featuring overvoltage protection (OVP), electrostatic discharge (ESD) protection, and undervoltage lockout (UVLO)/overcurrent protection (OCP) for automotive USB applications. The IC 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 low-voltage 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 IC can pass high-speed USB differential (D+ and D-) signals up to 480Mbps and has a low 90mΩ RON(MAX) for the BUS and a 4Ω RON(TYP)) for the D+ and Dlines. The EV kit is powered by the USB BUS. An onboard MAX15007A automotive regulator provides the IN reference voltage. The MAX20044F EV kit can also evaluate the MAX20042F and MAX20043F after IC replacement of U1. Quick Start Required Equipment ● MAX20044F 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) ● Set the supply A output to 5V, the supply B output to 18V, and disable both outputs. 3) 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. 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) Connect the logic function generator output to the white D+ test point and the ground to the black SHIELD test point. 7) Enable both power-supply outputs. 8) Enable the function generator output. ● USB BUS Undervoltage Lockout ● 1.3A (typ) USB BUS Overcurrent-Protection Threshold ● 1ms Overcurrent Blanking Time ● Passes 480Mbps USB Data Signals ● Low On-Resistance • BUS: 0.14mΩ (max) • D+ and D-: 4Ω (typ) ● FAULT Output Signal ● USB Powered ● Fully Assembled and Tested ● Evaluates the MAX20042F, MAX20043F, and MAX20044F ICs in a 16-Pin QSOP Package 19-7705; Rev 2; 2/17 JU2: Pins 1-2 (IN connected to on-board 3.3V reference) 2) Features ● Protects USB BUS, D+, and D- Signals from Overvoltages Up to 18V and ESD Events Verify that shunts are installed as follows: ● JU1: Pins 1-2 (MAX20044F switches disabled) Ordering Information appears at end of data sheet. Evaluates: MAX20042F/ MAX20043F/MAX20044F MAX20044F Evaluation Kit 9) Install a shunt on jumper JU1, pins 2-3 (MAX20044F switches enabled). 10) Use the oscilloscope to probe the HVBUS and HVD+ test points. 11) Verify that HVBUS is 5V and that the waveform on HVD+ is a 500kHz square wave and is approximately 3VP-P. 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. Detailed Description of Hardware The MAX20044F EV kit circuit demonstrates the MAX20044F automotive USB protector switch IC, featuring OVP, ESD protection, UVLO protection, and OCP for automotive USB applications. 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 15kV (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 1.3A (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. The IC can pass high-speed USB differential (D+ and D-) signals up to 480Mbps, and has a low 90mΩ RON(MAX) for BUS and a 4Ω RON(TYP) for the D+ and D- data lines. The EV kit is powered by the USB BUS. The 3.3V automotive regulator (U2, MAX15007A) provides an onboard IN reference voltage. A user can provide a 3V to 3.6V IN reference voltage across the VIN and GND PCB pads. The MAX20044F (U1) IC’s automotive operating temperature range is from -40°C to 105°C. Table 1. MAX20044F Enable (JU1) SHUNT POSITION EN PIN MAX20044F SWITCHES 1-2 Connected to IN Disabled 2-3 Connected to GND Enabled Not installed Connected to EN PCB pad EN externally controlled www.maximintegrated.com Long USB wire lengths contribute to increased wiring inductance, resulting in slow di/dt and dV/dt during a “short to 18V” event. The IC includes internal circuitry that switches off the switch between the HVBUS and BUS during an overvoltage on the HVBUS for these long USB wire conditions. Energy stored in the wiring inductance can cause the HVBUS node to quickly increase. Zener diode D1 clamps this flyback voltage, absorbing the energy in wiring inductance. Jumper Settings Bus and Data Switch Enable (JU1) Jumper JU1 on the EV kit enables the IC’s BUS and data switches. PCB pads EN and GND are provided to control U1’s enable signal with an external controller. Refer to the Electrical Characteristics EN Input section in the MAX20042F–MAX20044F 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 IC’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. PCB pads VIN and GND are provided to supply the IC with an external 3V to 3.6V reference voltage. See Table 2 for proper JU2 jumper settings. Evaluating the MAX20042F and MAX20043F The MAX20044F EV kit can also evaluate the MAX20042F and MAX20043F. Remove the MAX20044F (U1) and replace it with the desired device. The MAX20042F and MAX20043F are pin compatible with the MAX20044F. Refer to the MAX20042F–MAX20044F IC data sheet for additional information. Optional Common-Mode Choke PCB pads are provided on the EV kit for an optional common-mode choke (L1). Cut the traces shorting L1’s PCB pads before installing a choke. Table 2. MAX20044F IN Reference Voltage Selection (JU2) SHUNT POSITION IN PIN EV KIT FUNCTION 1-2 Connected to the on-board 3.3V regulator On-board reference provided by U2 2-3 Connected to the VIN PCB pad External 3V to 3.6V reference Maxim Integrated │  2 Evaluates: MAX20042F/ MAX20043F/MAX20044F MAX20044F Evaluation Kit Component List DESIGNATION QTY C1 1 0.1μF ±10%, 25V X7R ceramic capacitor (0603) Murata GRM188R71E104K C2 0 Not installed, ceramic capacitor C3, C4 2 3.3μF ±10%, 16V X7R ceramic capacitors (0805) Murata GRM21BR71C335K 2 0.1μF ±10%, 16V X7R ceramic capacitors (0603) Murata GRM188R71C104K C5, C7 C6 C8 C9 C14, C15 C16, C17 1 DESCRIPTION 10μF ±20%, 25V X7R ceramic capacitor (0805) Murata GRM219R61E106KA12D 1 100μF ±20%, 6.3V X7S ceramic capacitor (1210) Murata GRM32EC80J107M 1 10μF ±20%, 25V X7R ceramic capacitor (1210) TDK C3225X7R1E106M 2 2 6pF ±0.1pF, 50V C0G NP0 ceramic capacitors (0402) Murata GRM1555C1H6R0BZ01D 2pF ±0.1pF, 50V C0G NP0 ceramic capacitors (0402) Murata GRM1555C1H2R0BZ01D DESIGNATION QTY DESCRIPTION D1 1 20V, 500mW zener diode (SOD123) Fairchild MMSZ5250B GND1, GND2 2 Black multipurpose test points Keystone 5011 HVBUS, BUS 2 Red multipurpose test points Keystone 5010 J1, J2 2 USB type-A receptacles Assmann AU-Y1006-R JU1, JU2 2 3-pin headers, 2.54mm Sullins PEC36SAAN L1 1 Optional common-mode choke L4, L5 2 12nH inductors Murata LQW15AN12NJ00D L6, L7 2 4.7nH inductors Murata LQW15AN4N7D00D R1, R2 2 100kΩ ±5% resistors (0603) U1 1 USB automotive protector (16 QSOP) Maxim MAX20044FEGEEA/V+ U2 1 3.3V automotive regulator (8 SO-EP*) Maxim MAX15007AASA+ — 2 Shunts Kycon SX1100-B — 1 PCB: MAX20044 EVALUATION KIT# /V denotes an automotive qualified part. +Denotes a lead(Pb)-free/RoHS-compliant package. *EP = Exposed pad. www.maximintegrated.com Maxim Integrated │  3 MAX20044F Evaluation Kit Evaluates: MAX20042F/ MAX20043F/MAX20044F Figure 1. MAX20044F EV Kit Schematic www.maximintegrated.com Maxim Integrated │  4 Evaluates: MAX20042F/ MAX20043F/MAX20044F MAX20044F Evaluation Kit Figure 2. MAX20044F EV Kit—Component Side Figure 3. MAX20044F EV Kit PCB Layout—Component Side Figure 4. MAX20044F EV Kit PCB Layout—Layer 2 www.maximintegrated.com Maxim Integrated │  5 MAX20044F Evaluation Kit Figure 5. MAX20044F EV Kit PCB Layout—Layer 3 Evaluates: MAX20042F/ MAX20043F/MAX20044F Figure 6. MAX20044F EV Kit PCB Layout—Solder Side Ordering Information PART TYPE MAX20044EVKIT# EV Kit #Denotes RoHS compliant. www.maximintegrated.com Maxim Integrated │  6 Evaluates: MAX20042F/ MAX20043F/MAX20044F MAX20044F Evaluation Kit Revision History REVISION NUMBER REVISION DATE PAGES CHANGED 0 7/15 Initial release 1 12/16 Changed part numbers from MAX20042, MAX20043, and MAX20044 to MAX20042F, MAX20043F, and MAX20044F 2 2/17 Changed ordering part number in Ordering Information from MAX20044FEVKIT# to MAX20044EVKIT# DESCRIPTION — 1–7 6 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. │  7