DIO703

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DIO703• Rev 1.4

exceeded. The DIO703 is capable of delivering current up to the current limit threshold (ILIM) without damaging

the device. Once the threshold has been reached, the device switches into its constant current mode.

Thermal Protection

Thermal protection prevents damage to the IC when heavy overload or short circuit conditions are present for

extended periods of time. The conditions force the DIO703 into constant current mode, and under short circuit

conditions, the voltage across the switch is equal tothe input voltage. The increased dissipation causes the

junction temperature to rise to high levels. The protection circuit senses the junction temperature of the switch

and shuts it off. Hysteresis is built into the thermal sense circuit, and after the device has cooled approximately

20 degrees, the switch turns back on. The switch continuesto cycle in this way until the overload or input power is

removed.

Reverse-voltage Protection

The reverse-voltage protection feature turns off the P-channel MOSFET whenever the output voltage exceeds

the input voltage by 175mV (typ) for 4ms (typ). A reverse current of (VOUT-VIN)/RDS(on) will be present when this

occurs. This prevents damage to devices on the input side of the DIO703 by preventing significant current from

sinking into the input capacitance. The DIO703 devices allow the P-channel MOSFET to turn on once the output

voltage goes bellow the input voltage for the same 4ms deglitch time.

FLG Output

An error Flag is an open-drained output of an N-channel MOSFET. Flag output is pulled low when the below

conditions happen: input under voltage lockout, output current limit, output short circuit and over temperature

shut down. The flag response delay time is 5ms typically.