Pins description

L5964

8/16

DB4679 Rev 1

5

SWGND1

GROUND DC/DC analog blocks ground (Switching ground).

6

SWGND2

GROUND DC/DC analog blocks ground (Switching ground).

7

FDIVISION

IN

Frequency divider setting to make DC/DC2 working at a frequency that is

1/1, 1/2, 1/4 or 1/8 of DC/DC1 one. If connected to ground, puts the

device in parallel mode (for evaluation purposes only).

8

SUB

GROUND Device substrate ground.

9

VINBUCK2

SUPPLY

DC/DC2 power supply connection.

10

VINBUCK2

SUPPLY

DC/DC2 power supply connection.

11

BS2

OUT

Boot-strap capacitor connection for DC/DC2.

12

PHASE2

OUT

DC/DC2 power stage output (for external inductor and boot-strap

capacitor connection).

13

PHASE2

OUT

DC/DC2 power stage output (for external inductor and boot-strap

capacitor connection).

14

ENBUCK1

IN

DC/DC1 enable (active high).

15

ENBUCK2

IN

DC/DC2 enable (active high).

16

PGTH1

IN

Power good threshold setting for DC/DC1. Pin floating sets the threshold

to 95% of Vout; shorted to AGND sets the threshold to 85% of Vout.

17

PGTH2

IN

Power good threshold setting for DC/DC2. Pin floating sets the threshold

to 95% of Vout; shorted to AGND sets the threshold to 85% of Vout.

18

N.C.

-

Not Connected.

19

PGND2

GROUND Power ground of DC/DC2. Connected to internal low-side source.

20

PGND2

GROUND Power ground of DC/DC2. Connected to internal low-side source.

21

RESET

OUT

Reset signal to Microprocessor in Microcontroller Mode: in Normal mode

is kept in high impedance state. Open-drain output.

22

N.C.

-

Not Connected.

23

IGN_BUF

OUT

DC/DC1 status (ON/OFF) echo to Microprocessor in Microcontroller

Mode: in Normal Mode is kept in high impedance. Open-drain output.

24

N.C.

-

Not Connected.

25

N.C.

-

Not Connected.

26

UV2

OUT

Under-voltage DC/DC2 signal. Open-drain output.

27

N.C.

-

Not Connected.

28

UV1

OUT

Under-voltage DC/DC1 signal. Open-drain output.

29

PGND1

GROUND Power ground of DC/DC1. Connected to internal low-side source.

30

PGND1

GROUND Power ground of DC/DC1. Connected to internal low-side source.

31

N.C.

-

Not Connected.

32

OCPSET2

IN

Programmable OCP setting for DC/DC2. Pin floating sets the overcurrent

threshold to 4A; shorted to AGND sets the threshold to 2 A.

Table 2. LQFP64 pin list (continued)

N#

Pin name

Pin type

Pin description