ADPL12002/ADPL12003

20V, 2.5A/3.5A, Fully Integrated Synchronous

Buck Converter

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the converter turns on the high-side switch again. This cycle repeats until the short-circuit or overload condition is

removed.

A short-circuit is detected when the output voltage falls below 50% of the regulation voltage while in the current limit. If

this occurs, hiccup mode activates, and the output turns off for 35ms (10 x 3.5ms, 1.5MHz) or 25ms (10 x 2.5ms, 400kHz)

and then attempts to restart. This repeats indefinitely while the short-circuit condition is present. Hiccup mode is disabled

during soft-start.

Thermal Shutdown

Thermal shutdown protects the devices from excessive operating temperature. When the junction temperature exceeds

+175°C, an internal sensor shuts down the step-down converter, which allows the ICs to cool. The sensor turns the ICs

on again after the junction temperature cools by 15°C.

Overvoltage Protection

The ICs feature overvoltage protection for the output. In case of an overvoltage event in skip mode, the high-side switch

is turned OFF, and the low-side switch is turned ON until the inductor current reaches a fixed negative value. Once this

value is reached, the low-side switch is turned OFF, and turns ON again in the next cycle until the output falls below the

OV falling threshold. This way, the output is quickly discharged and brought back to regulation.