L9918 datasheet(18/109 Pages) STMICROELECTRONICS

Part #	L9918

Description	Alternator voltage regulator with LIN interface for 12 V applications

PDF	109 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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18 / 109 page

Figure 8. Low voltage function behavior

Behaviour in case of under voltage detection:

When the battery voltage is lower than POR threshold (VBPOR) and td time is elapsed, the device enters in

standby condition showing a low power consumption.

The device can sustain micro-interruption in battery line without having a logic reset.

Deep Low Voltage range:

When B+ falls in deep low voltage range (VBdeepLV) the device isn’t under reset and regulation loop computation

is functioning, with possible degradation of parameters. However EXC operation is reduced.

Figure 9. Battery voltage range

B +

Safety Overvoltage or Low Voltage function (EXC OFF)

Regular Functioning

Low Voltage without parameter degradation (EXC ON)

Deep Low Voltage: possible parameter degradation (EXC ON)

Undervoltage: device in Power On Reset condition (EXC OFF)

VBOV_safety or

VBOV

LOW

Max

VBDeepLV

VBPOR

Min

VBDeepLV

The picture reports main voltage operation ranges.

L9918

B+ characteristics

DS13000 - Rev 2

page 18/109

L9918 Datasheet(PDF) 18 Page - STMicroelectronics