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L6712A L6712

(*) Pin not reported in QFN column have to be considered as Not Connected, not internally bonded.

Figure 4. Reference Schematic

20 to 22

22 to 24

VID0-2

Voltage IDentification pins. These input are internally pulled-up. They are used to

program the output voltage as specified in Table 1 and to set the PGOOD, OVP

and UVP thresholds.

Connect to GND to program a ‘0’ while leave floating to program a ‘1’.

23

25

PGOOD

This pin is an open collector output and is pulled low if the output voltage is not

within the above specified thresholds and during soft-start.

It cannot be pulled up above 5V. If not used may be left floating.

24

27

BOOT2

Channel 2 HS driver supply. This pin supplies the relative high side driver.

Connect through a capacitor (100nF typ.) to the PHASE2 pin and through a diode

to VCC (cathode vs. boot).

25

28

UGATE2

Channel 2 HS driver output.

A little series resistor helps in reducing device-dissipated power.

26

29

PHASE2

Channel 2 HS driver return path. It must be connected to the HS2 mosfet source

and provides the return path for the HS driver of channel 2.

27

30

LGATE2

Channel 2 LS driver output.

A little series resistor helps in reducing device-dissipated power.

28

31,

32

PGND

LS drivers return path.

This pin is common to both sections and it must be connected through the

closest path to the LS mosfets source pins in order to reduce the noise injection

into the device.

PAD

THERMAL

PAD

Thermal pad connects the silicon substrate and makes a good thermal contact

with the PCB to dissipate the power necessary to drive the external

mosfets.Connect to the GND plane with several vias to improve thermal

conductivity.

Table 6. Pin Function (continued)

N. (*)

Name

Description

SO

VFQFPN

PGOOD

PGND

PGNDS2

ISEN2

LGATE2

VSEN

PHASE2

UGATE2

BOOT2

VCC

SGND

OSC / INH

VID0

VID1

VID2

REF_IN/OUT

PGNDS1

ISEN1

LGATE1

PHASE1

UGATE1

BOOT1

VCCDR

FBR

FBG

Rg

Rg

LS2

HS2

L2

C

IN

C

OUT

S1

S0

S2

Rg

LS1

L1

HS1

Vin

GNDin

PGOOD

L6712

L6712A

LOAD

Rg

FB

COMP

DROOP

R

FB

R

F

C

F