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Evaluates: MAX25410

MAX25410 Evaluation Kit

A) CC Short-to-VBUS Protection

The following procedure demonstrates MAX25410’s

response to a CC short-to-VBUS event through the

USB-C connector.

Required Equipment

● MAX25410 EV kit

● 14V/1A DC power supply or car battery (VBAT)

● 24V/1A DC power supply

● USB-C breakout board plug

(USB3.1-CM-BO-V2A or equivalent)

● Oscilloscope with four analog channels, one digital

channel, and a current probe

Step-by-step

1) Verify that both VCONN selection jumpers are set to

‘H’ (no VCONN is being sourced).

2) Set the VBAT power supply to 14V output, 1A current

limit. Turn the output off. Connect the negative lead to

the GND test loop on the EV kit. Connect the positive

lead to the VBAT test point on the EV kit.

3) Turn the VBAT power-supply output on. The green

PGOOD LED should turn on.

4) Plug the USB-C breakout board plug into the EV kit

receptacle.

5) Connect the oscilloscope probes as shown in Figure

6) Verify that VCC is at 5.0V and FAULT is logic-high.

7) Set the VBUS power supply to 24V output, 1A current

limit. Turn the output off. Connect the negative lead to

the GND test loop on the EV kit. Connect the positive

lead to the VBUS test point on the EV kit.

8) Turn the VBUS power-supply output on.

9) Use a wire to short VBUS to CC1 on the breakout

board. Do not short VBUS directly to the HVCC1 test

point.

10) Observe that MAX25410 protects the low-voltage

CC1 node to a safe amplitude and duration (6V and

less than 50ns) thanks to its fast response to over-

voltage events. Note that FAULT is being asserted to

signal the USB-PD controller. Once the overvoltage

condition is removed, MAX25410 will recover auto-

matically and release FAULT after 16ms.

Figure 2. CC Short-to-VBUS Setup

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