L6919E

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PIN FUNCTION

N

Name

Description

1

LGATE1

Channel 1 LS driver output.

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

2

VCCDR

LS drivers supply: it can be varied from 5V to 12V buses.

Filter locally with at least 1

µF ceramic cap vs. PGND.

3

PHASE1

Channel 1 HS driver return path. It must be connected to the HS1 mosfet source and provides

the return path for the HS driver of channel 1.

4

UGATE1

Channel 1 HS driver output.

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

5

BOOT1

Channel 1 HS driver supply. This pin supplies the relative high side driver.

Connect through a capacitor (100nF typ.) to the PHASE1 pin and through a diode to VCC

(cathode vs. boot).

6

VCC

Device supply voltage. The operative supply voltage is 12V ±10%.

Filter with 1

µF (Typ.) capacitor vs. GND.

7

GND

All the internal references are referred to this pin. Connect it to the PCB signal ground.

8

COMP

This pin is connected to the error amplifier output and is used to compensate the control

feedback loop.

9

FB

This pin is connected to the error amplifier inverting input and is used to compensate the

voltage control feedback loop.

A current proportional to the sum of the current sensed in both channel is sourced from this pin

(50

µA at full load, 70µA at the Constant Current threshold). Connecting a resistor between this

pin and VSEN pin allows programming the droop effect.

10

VSEN

Manages Over&Under-voltage conditions and the PGOOD signal. It is internally connected with

the output of the Remote Sense Buffer for Remote Sense of the regulated voltage.

If no Remote Sense is implemented, connect it directly to the regulated voltage in order to

manage OVP, UVP and PGOOD.

Connecting 1nF capacitor max vs. SGND can help in reducing noise injection.

11

FBR

Remote sense buffer non-inverting input. It has to be connected to the positive side of the load

to perform a remote sense.

If no remote sense is implemented, connect directly to the output voltage (in this case connect

also the VSEN pin directly to the output regulated voltage).

12

FBG

Remote sense buffer inverting input. It has to be connected to the negative side of the load to

perform a remote sense.

Pull-down to ground if no remote sense is implemented.

13

ISEN1

Channel 1 current sense pin. The output current may be sensed across a sense resistor or

to the sense resistor through a resistor Rg.

The net connecting the pin to the sense point must be routed as close as possible to the

PGNDS net in order to couple in common mode any picked-up noise.

14

PGNDS1

Channel 1 Power Ground sense pin. The net connecting the pin to the sense point must be

routed as close as possible to the ISEN1 net in order to couple in common mode any picked-up

noise.

15

PGNDS2

Channel 2 Power Ground sense pin. The net connecting the pin to the sense point must be

routed as close as possible to the ISEN2 net in order to couple in common mode any picked-up

noise.

16

ISEN2

Channel 2 current sense pin. The output current may be sensed across a sense resistor or

to the sense resistor through a resistor Rg.

The net connecting the pin to the sense point must be routed as close as possible to the

PGNDS net in order to couple in common mode any picked-up noise.