L99VR02XP datasheet(30/50 Pages) STMICROELECTRONICS

Part #	L99VR02XP

Description	Dual automotive linear voltage regulator with configurable output voltage (2x250 mA current capability)

PDF	50 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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30 / 50 page

4.9

Overvoltage detection by advanced thermal warning read-out

The TW_LDO1,2 pins also provide diagnostics about output overvoltage (OV_LDO1,2); to distinguish between a

thermal warning event and an output overvoltage event, two different signals are generated at the same

TW_LDO1,2 output pins. How reported in the Section 4.7: Thermal warning and thermal shutdown a thermal

warning event detection sets the TW_LDO1,2 pins LOW, instead an overvoltage event generates a square wave

at the TW_LDO1,2 pins (see the Figure 48).

Overvoltage detection has a higher priority than thermal warning detection so that concurrence of thermal warning

and over voltage events lead to a square wave like in the case of overvoltage detection (as shown in the

Figure 48).

Figure 48. Square ware on TW_LDO1,2 pins generated during an overvoltage

A typical example of over temperature and overvoltage management failures is depicted in the Figure 49.

Figure 49. Warning signal caused by overvoltage and thermal warning on TW_LDO1,2 pins

L99VR02XP

Application information

DS14686 - Rev 1

page 30/50

L99VR02XP Datasheet(PDF) 30 Page - STMicroelectronics