4.5V to 28V Input, Synchronous PWM Buck Controllers

for DDR Termination and Point-of-Load Applications

14

______________________________________________________________________________________

Typical Application Circuits

C4

0.47

µF

10V

Q1

IRF7832

Q2

2xIRF7832

L1

1.0

µH

30A

R6

1

Ω

C8

4700pF

OPTIONAL

R2

19.1k

Ω

R3

6.04k

Ω

C6

3x470

µF

4V

C5

10

µF

6.3V

VOUT

PGND

C3

4.7

µF

6.3V

D1

CMPSH-3

2.5V AT

20A

12V

VIN

C2

2x470

µF

16V

C1

10

µF

16V

MAX8554

VL

POK

R1

20k

Ω

ON

OFF

C7

0.22

µF

10V

R4

25.5k

Ω

R5

110k

Ω

POK

V+

EN

HSD

REF

ILIM

GND

FSEL

VL

BST

DH

LX

DL

PGND

OUT

FB

C4

0.47

µF

6.3V

Q1

IRF7821

Q2

IRF7821

L1

0.68

µH

9A

C5

10

µF

6.3V

C6

4x470

µF

2V

VOUT

PGND

C3

4.7

µF

6.3V

D1

CMPSH-3

1.25V AT

8A

2.5V

VIN

C2

2x330

µF

6V

C1

10

µF

6.3V

MAX8553

POK

R3

20k

Ω

C8

0.22

µF

10V

6V TO 28V

R1

143k

Ω

R6

54.9k

Ω

POK

V+

REFIN

EN/HSD

REF

ILIM

GND

FSEL

VL

BST

DH

LX

DL

PGND

VTT

VTTR

VTTR

C7

1

µF

6.3V

VL

V+

REFIN

C9

0.47

µF

25V

SDN

R5

100k

Ω

Q3

2N7002K

R2

5.1k

Ω

R4

0.002

Ω

C10

2200

µF

R7

3

Ω

R8

20

Ω

C11

1

µF