L6788A

Pins description and connection diagram

Doc ID 15341 Rev 2

5/18

2

Pins description and connection diagram

Figure 3.

Pin connection (top view)

2.1

Pin description

31

32

33

34

35

36

37

38

39

40

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10

30

29

28

27

26

25

24

23

22

21

20

19

18

17

16

15

14

13

12

11

PHASE3

LGATE3

VCC2_DR

UGATE2

BOOT2

PHASE2

LGATE2

VCC1_IC

LGATE1

PHASE1

FB

FBRTN

CS3+

CS3-

CS2+

CS2-

CS1+

CS1-

R1

R2

PGND

Table 2.

Pin description

Pin n°

Name

Description

1BOOT1

Channel 1 HS driver supply. Connect through a capacitor (100 nF typ.) to

PHASE1

Needed external bootstrap diode.

The device implements Vin detections through this pin. See “vin detection”

section for details. A small resistor in series to the boot diode helps in reducing

Boot capacitor overcharge (see reference schematic).

2UGATE1

Channel 1 HS driver output. It must be connected to the HS1 MOSFET gate.

A small series resistors helps in reducing device-dissipated power.

3POK

Power OK

Open drain output sets free after soft start has finished and pulled low when

triggering any latched protection (OVP, UVP, OCP average).

Pull up to a voltage lower than 3.3 V (typ), if not used it can be left floating.

4

SCL

Serial BUS clock input.

5

SDA

Serial BUS data input.