ADP3412

–7–

REV. 0

ler. The peak surge current rating should be checked in-circuit,

since this is dependent on the source impedance of the 5 V sup-

Delay Capacitor Selection

when the low-side FET drive turns off and when the high-side

drive starts to turn on. The delay capacitor adds 1 ns/pF of

additional time to the 20 ns of fixed delay.

If a delay capacitor is required, look for a good quality ceramic

capacitor with an NPO or COG dielectric, or for a good quality

mica capacitor. Both types of capacitors are available in the 1 pF

to 100 pF range and have excellent temperature and leakage

characteristics.

1

2

3

4

8

7

6

5

BST

IN

DLY

VCC

DRVH

SW

PGND

DRVL

U2

ADP3412

16

15

14

13

12

11

10

9

1

2

3

4

5

6

7

8

VID4

VID3

VID2

VID1

VCC

REF

CS–

PWM1

VID0

COMP

FB

CT

PWM2

CS+

PWRGND

GND

U1

ADP3160

U3

ADP3412

1

2

3

4

8

7

6

5

BST

IN

DLY

VCC

DRVH

SW

PGND

DRVL

C15

C14

C13

C12

12V

270 F

4

OS-CON 16V

60.4k

10k

1.4nF

1.1k

C11 C16 C17 C18 C19 C20 C21 C22

1200 F

8

OS-CON 2.5V

11m

ESR (EACH)

1.1V – 1.85V

53.4A

RTN

Q3

FDB7030L

D1

MBR052LTI

Q5

2N3904

L2

600nH

L1

600nH

Q1

FDB7030L

Q2

FDB8030L

C10

1 F

D2

MBR052LTI

C7

15pF

C5

1 F

Z1

ZMM5236BCT

R5

2.4k

R8

330

C23

330pF

C22

1nF

C4

4.7 F

R6

10

C21

15nF

C26

4.7 F

C8

15pF

C6

1 F

C9

1 F

R7

20

R4

4m

C2

100pF

C1

150pF

R1

1k

Q4

FDB8030L

+

+

+

+

+

+

+

+

FROM

CPU

Figure 3. 53.4 A Intel CPU Supply Circuit

Printed Circuit Board Layout Considerations

Use the following general guidelines when designing printed

circuit boards:

1.

Trace out the high-current paths and use short, wide traces

to make these connections.

2.

Connect the PGND pin of the ADP3412 as close as pos-

sible to the source of the lower MOSFET.

3.

The VCC bypass capacitor should be located as close as

possible to VCC and PGND pins.

Typical Application Circuits

The circuit in Figure 3 shows how two drivers can be com-

bined with the ADP3160 to form a total power conversion

puter. Figure 4 gives CPU a similar application circuit for a

35 A processor.