Community Translation: LITIX™ : 逆バッテリ保護をISOパルスの堅牢性
Please refer to the datasheet. The device can protect itself down to -18V of supply voltage (P_4.1.1). This negative supply voltage range can be applied for a short time period (a pulse) but not permanently, as the device is not designed to work in this range. What has to be ensured in the application is that Vs always remains above -18V (in order to not destroy the ESD structure), therefore the reverse protection diode is needed for protection against the ISO pulses.
For reverse protection, we recommend to use a protective circuit: a reverse protection diode in combination with a TVS suppressor diode that clamps the voltage at 36V as shown https://www.infineon.com/cms/en/about-infineon/company/contacts/support/images/ISO_pulse_protection_... here.
During reverse supply voltage we have a current consumption of around 1-2mA on the supply line. IOUTx(rev), datasheet parameter P_6.5.2, is the output current so that there is no reverse current flowing through the LEDs.
