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10

9

DROOP

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).

Short to FB to implement the Droop effect: the resistor connected between FB

and VSEN (or the regulated output) allows programming the droop effect.

Otherwise, connect to GND directly or through a resistor (43k

Ω max) and filter

with 1nF capacitor. In this last case, current information can be used for other

purposes.

11

11

REF_IN /

OUT

Reference input/output. Filter vs. GND with 1nF ceramic capacitor (a total of

100nF capacitor is allowed).

It reproduces the reference used for the regulation following VID code: when

VID=111, the reference for the regulation must be connected on this pin.

References ranging from 0.800V up to 3.300V can be accepted.

12

12

VSEN

Connected to the output voltage it is able to manage Over & Under-voltage

conditions and the PGOOD signal. It is internally connected with the output of the

Remote Sense Amplifier for Remote Sense of the regulated voltage.

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

this pin.

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

order to manage OVP, UVP and PGOOD.

13

13

ISEN1

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

low-side mosfet drain 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

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

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

16

ISEN2

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

low-side mosfet drain 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.

17

18

OSC/INH

FAULT

Oscillator pin.

It allows programming the switching frequency of each channel: the equivalent

switching frequency at the load side results in being doubled.

Internally fixed at 1.24V, the frequency is varied proportionally to the current sunk

(forced) from (into) the pin with an internal gain of 6kHz/

µA (See relevant section

for details). If the pin is not connected, the switching frequency is 150kHz for

each channel (300kHz on the load).

The pin is forced high (5V Typ.) when an Over Voltage is detected; to recover

from this condition, cycle VCC.

Forcing the pin to a voltage lower than 0.6V, the device stops operation and

enters the inhibit state.

18

20

FBG

Remote sense amplifier inverting input. It has to be connected to the negative

side of the load to perform programmable remote sensing through apposite

resistors (see relative section).

19

21

FBR

Remote sense amplifier non-inverting input. It has to be connected to the positive

side of the load to perform programmable remote sensing through apposite

resistors (see relative section).

Table 6. Pin Function (continued)

N. (*)

Name

Description

SO

VFQFPN