Evaluates: MAX20042F/
MAX20043F/MAX20044F
MAX20044F Evaluation Kit
General Description
Quick Start
The MAX20044F evaluation kit (EV kit) circuit demon-
strates 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.
Required Equipment
●
●
●
●
●
MAX20044F EV kit
5V, 2A DC power supply (supply A)
18V, 2A DC power supply (supply B)
Logic function generator
Oscilloscope
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.
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.
The IC can pass high-speed USB differential (D+ and D-)
1) Verify that shunts are installed as follows:
signals up to 480Mbps and has a low 90mΩ R
ON(MAX)
●
●
JU1: Pins 1-2 (MAX20044F switches disabled)
for the BUS and a 4Ω R
) for the D+ and D-
ON(TYP)
JU2: Pins 1-2 (IN connected to on-board 3.3V
reference)
lines. The EV kit is powered by the USB BUS. An on-
board MAX15007A automotive regulator provides the IN
reference voltage. The MAX20044F EV kit can also evalu-
ate the MAX20042F and MAX20043F after IC replace-
ment of U1.
2) 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: 3V
,
P-P
1.5V DC offset square wave, 500kHz, and disable the
output.
Features
● Protects USB BUS, D+, and D- Signals from
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.
Overvoltages Up to 18V and ESD Events
● USB BUS Undervoltage Lockout
● 1.3A (typ) USB BUS Overcurrent-Protection
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 out-
put for later use.
Threshold
● 1ms Overcurrent Blanking Time
● Passes 480Mbps USB Data Signals
6) Connect the logic function generator output to the
white D+ test point and the ground to the black
SHIELD test point.
● Low On-Resistance
• BUS: 0.14mΩ (max)
• D+ and D-: 4Ω (typ)
7) Enable both power-supply outputs.
8) Enable the function generator output.
● FAULT Output Signal
● USB Powered
● Fully Assembled and Tested
Ordering Information appears at end of data sheet.
● Evaluates the MAX20042F, MAX20043F, and
MAX20044F ICs in a 16-Pin QSOP Package
19-7705; Rev 2; 2/17