TLV62065

SLVSAC4B – NOVEMBER 2010 – REVISED DECEMBER 2015

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Device Functional Modes (continued)

7.4.3 Internal Current Limit / Fold-back Current Limit for Short-Circuit Protection

During normal operation the high-side and low-side MOSFET switches are protected by its current limits ILIMF.

Once the high-side MOSFET switch reaches its current limit, it is turned off and the low-side MOSFET switch is

turned on. The high-side MOSFET switch can only turn on again, once the current in the low-side MOSFET

switch decreases below its current limit ILIMF. The device is capable to provide peak inductor currents up to its

internal current limit ILIMF.

As soon as the switch current limits are hit and the output voltage falls below 1/3 of the nominal output voltage

due to overload or short circuit condition, the foldback current limit is enabled. In this case the switch current limit

is reduced to 1/3 of the nominal value ILIMF.

Due to the short-circuit protection is enabled during start-up, the device does not deliver more than 1/3 of its

nominal current limit ILIMF until the output voltage exceeds 1/3 of the nominal output voltage. This needs to be

considered when a load is connected to the output of the converter, which acts as a current sink.

7.4.4 Output Capacitor Discharge

With EN = GND, the device enters shutdown mode and all internal circuits are disabled. The SW pin is

connected to PGND through an internal resistor to discharge the output capacitor. This feature ensures a start-up

in a discharged output capacitor once the converter is enabled again and prevents floating charge on the output

capacitor. The output voltage ramps up monotonic starting from 0 V.

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