RT9218B Ver la hoja de datos (PDF) - Richtek Technology

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RT9218B

12V Synchronous Buck PWM DC-DC and Linear Power Controller

Richtek Technology 

RT9218B

Typical Application Circuit

VIN

5 to 12V

VCC

12V D1

RBOOT

1N4148

2.2

C8

SVOUT

C1 to C2

1000uF x 2

L1

C3 to C4

1uF x 2

Q1

MU

C7

RUGATE

1uF

2.2

C5 to C6

1000uF x 2

2.2uH

R Q2

ML

C

PHASE

Q3

0.1uF

RT9218B

1 BOOT PHASE 14

2 UGATE

3 GND

OPS 13

FB 12

4 LGATE

VCC 11

5 DRV

6 NC

PGOOD 10

9

FBL

7 NC

NC 8

VCC

12V

PHASE

R3

10R

ROCSET

Q4

Disable

C10

3904

1uF

R1

LVOUT

4k

R2

C9

8k

470uF

R4

C11

1k/NC 0.1uF/NC R6

R5

32R

68R

SVOUT

=

VREF

× (1+

R5

R6

)

LVOUT

=

VREF × (1+

R1)

R2

VREF : Internal reference voltage

(0.8V ± 1%)

www.richtek.com

2

DS9218B-09 March 2007

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