LX

PGND

BOOT

SGND

CDC

L

Current

Monitor

DC/DC

Control

PVIN

Current limit

VDRIVEL

FB

FB

LOAD

7.2.1

Output current monitor

The CDC pin provides a voltage proportional to the output current according to the following formula:

VCDC=k×ILOAD×RSENSE

(2)

where k=18

Such a feature is very useful in case the device is embedded in a system with multiple ports and power sharing,

7.3

Auto discharge

When one of the protections is triggered, the digital En bit is set or the enable pin is pulled low, the STPD01 turns

on a 60 mA current sink which discharges the LX node.

digital En bit is set, but it is always active when EN pin is pulled low.

7.4

Power-on

The power-on (Pon) is an open drain pin and provides information on the start-up of the device. After start-up, it

detects if the output voltage is within the +/-5% window of the regulation point, in this case the Pon pin goes to

high impedance.

The pin can be left floating if not used.

STPD01

Auto discharge

DS13473 - Rev 1

page 18/43