IR3551 datasheet(3/22 Pages) IRF

Part #	IR3551

Description	The IR3551 integrated PowIRstage짰 is a synchronous buck gate driver co-packed with a control MOSFET and a synchronous MOSFET with integrated Schottky diode.

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Manufacturer	IRF [International Rectifier]

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September 10, 2012 | FINAL DATASHEET

3

IR3551

50A Integrated PowIRstage®

TYPICAL APPLICATION DIAGRAM (CONTINUED)

SW

PWM

VIN

PGND

Gate

Drivers

and

Current

Sense

Amplifier

IOUT

VCC

PHSFLT#

VCC

BOOST

VIN

PWM

REFIN

PHSFLT#

BBRK#

CS+

LGND

CSIN-

CSIN+

IR3551

4.5V to 7V

4.5V to 15V

C2

10uF x 2

C5

0.22uF

C3

0.1uF

R1

10k

C4

0.22uF

R2

2.49k

L1

150nH

3

16-19

20

21

22

23

24

26

25

1

2

14, 15

6-13

C1

0.1uF

PGND 4

27

TGND

No Connect

CS-

VOUT

C7

470uF

C6

22uF

Figure 5: Application Circuit without Current Sense Amplifier

FUNCTIONAL BLOCK DIAGRAM

PHSFLT#

PWM

6

7

8

9

10

11

12

13

16

17

18

19

VIN

SW

1

27

14

15

CSIN-

PGND

TGND

20

BOOST

Power-on

Reset

(POR),

3.3V

Reference,

and

Dead-time

Control

22

IOUT

26

VCC

3

BBRK#

23

5

28

GATEL

Driver

21

2

CSIN+

24

LGND

25

REFIN

Current Sense

Amplifier

MOSFET

& Thermal

Detection

S

Q

R

POR

3.3V

VCC

-

+

3.3V

4

PGND

200k

18k

-

+

Diode

Emulation

Comparator

IR3551

Offset -+

VCC

Figure 6: IR3551 Functional Block Diagram

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