RT9227A Datasheet

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RT9227A

Typical Application Circuit

12V

15A

1uH

+

Preliminary

5V

GND

4*1000uF

10

2*1uF

1uF

1000pF

1

VCC

3.3V

12

+

1000uF

RFD3055

+

15

16

1000uF

13

V

OUT2

2.5V

11

+

270uF

6

5

4

3

2

VID0

VID1

VID2

VID3

VID4

SS

GND

14

FAULT

8

9

0.039uF

732K

VSEN1

FB1

GATE3

FB3

UGATE1

PHASE2

RT9227A

VOUT2 LGATE1

FB2

PGND

VIN2

OSET1

PGOOD

20

7

1.21K

POWERGOOD

V

OUT3

1.5V

24

23

22

21

19

18

PHB83N03LT

3.5uH

PHB95N03LT

4.99K

10K

V

OUT1

1.3V to 3.5V

7*1000uF

+

0.68uF

Function Block Diagram

VSEN1

OCSET1

VCC

FB3

GATE3

VIN2

3.3V

+

-

-

+

0.3V

110%

+

-

+

-

90%

Power-On

Reset (POR)

+

-

+

-

3.3V

PGOOD

VCC

UGATE1

Over Voltage

VOUT2

FB2

1.26V

115%

+

-

+

0.25A

-

OC2

Soft Start

& Fault Logic

OC1

+

-

Inhibit

Gate

Control

Logic

VCC

Oscillator

Lower

Drive

LGATE1

PGND

GND

PHASE1

FAULT

VCC

11uA

5V

DACOUT

+

PWM

Comparator

+

-

TTL D/A

Converter

(DAC)

-

Error

Amplifier

PWM

Compensation

www.richtek.com

2

VID0

VID1

VID2

VID3

VID4

SS

FB1

DS9227A-05 March 2007

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