L9779WD datasheet(41/170 Pages) STMICROELECTRONICS

Part #	L9779WD

Description	Multifunction IC for engine management system

PDF	170 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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41 / 170 page

DocID027452 Rev 5

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L9779WD

Functional description

169

Capacitor legend:

 50 V

 25 V

 16 V

X7R

 -40 to 125 °C ±15%

 -40 to 125 °C ±10%

Note:

Others N-MOSFET can be used provided that they have similar threshold voltage and input

capacitance; however regulator transient performances may have deviation to be checked.

PCB layout Note: The Cin capacitor on VB line should be put as close as possible to the

drain of external MOS. The suggestion PCB layout is as below.

Figure 17. Circuit and PCB layout suggested

V3V3

CV3V3

External V3V3

capacitor

1 µF

10 µF

C2012X7R1E105K--1 µF

C1608X7R1C105K--1 µF

C3216X7R1H105K--1 µF

C3225X7R1E106K--10 µF

C3225X7R1C106K--10 µF

External charge pump

capacitor

-20%

100nF

+20%

Table 13. Voltage regulators external components required (continued)

Symbol

Parameter

Min

Typ

Max

Suggested part number

L9779WD Datasheet(PDF) 41 Page - STMicroelectronics

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