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PT8120 Series

30-A 12-V Input Programmable

Integrated Switching Regulator

PT8124 Standard Application

= Required 1500µF electrolytic

1,200µF aluminum electrolytic

= Optional 1µH input choke

PT8124

(Only)

4321

31

23–30

617–22

12–16

L

O

A

D

C

OUT

+

C

IN

+

PROGRAMMING PINS

V

IN

V

OUT

GND

REMOTE SENSE

STBY*

VID 25mV

VID 0

VID 1

VID 2

L

in

1µH

GND

VID 3

5

VID

Common

11

VID 3

VID 2 VID 1 VID 0

11

11

11

10

11

01

11

00

10

11

10

10

10

01

10

00

01

11

01

10

01

01

01

00

00

11

00

10

00

01

00

00

*For STBY pin:

Open

=Output Enabled

Ground

=Output Disabled

Pin Function

1

VID 25mV

2

VID 0

3

VID 1

4

VID 2

5

VID 3

6

STBY

7

Do Not Connect

8

Do Not Connect

9

Do Not Connect

10

Do Not Connect

11

VID Common

12

13

14

15

16

Notes:

i) Logic 0 = Connect to VID Common

ii) Logic 1 = Open circuit (no pull-up resistors)

iii) VID2 and VID3 may not be changed while the unit is operating.

Pin Function

17

GND

18

GND

19

GND

20

GND

21

GND

22

GND

23

24

25

26

27

28

29

30

31

Remote Sense

PT8124 Pin-Out Information

(VRM 8.5)

VID 25mV=0

VID 25mV=1

Vout

Vout

1.300V

1.325V

1.350V

1.375V

1.400V

1.425V

1.450V

1.475V

1.500V

1.525V

1.550V

1.575V

1.600V

1.625V

1.650V

1.675V

1.700V

1.725V

1.750V

1.775V

1.800V

1.825V

1.050V

1.075V

1.100V

1.125V

1.150V

1.175V

1.200V

1.225V

1.250V

1.275V

PT8124 Voltage Programming Information