L6738

Pin description and connection diagrams

Doc ID 18133 Rev 1

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2

Pin description and connection diagrams

2.1

Pin descriptions

Figure 4.

Pin connection (top view)

1

2

3

VSEN

FBG

VCCDR

12

6

10

11

L6738

LGATE

PHASE

CSN

7

5

16 15 14

BOOT

4

8

FB

9

13

Table 2.

Pin description

Pin#

Name

Function

1

VCCDR

Low side driver section power supply.

Operative voltage is 5 V to 12 V bus. Filter with 1

µF MLCC to GND.

2LGATE

Low-side driver output.

Connect directly to the low-side MOSFET gate. A small series resistor can be useful to

reduce dissipated power especially in high frequency applications.

3

PHASE

High-side driver return path.

Connect to the high-side MOSFET source. This pin is also monitored for the adaptive

dead-time management.

4BOOT

High-side driver supply.

PHASE pin. The pin is internally connected through a boot diode to the VCCDR pin. A

2.2Ohm series resistor is also provided. See

Section 8 f or guidance in designing the

capacitor value.

5UGATE

High-side driver output.

Connect to high-side MOSFET gate. A small series resistor may help in reducing the

PHASE pin negative spike as well as cooling the device.

6

PGOOD

Power Good.

It is an open-drain output set free after SS (with 3x clock cycle delay) as long as the out-

put voltage monitored through VSEN is within specifications. Pull-up to 3.3 V (typ) or

lower, if not used it can be left floating.