ADP1147AR-33 datasheet(6/12 Pages) AD

Part #	ADP1147AR-33

Description	High Efficiency Step-Down Switching Regulator Controllers

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ADP1147-3.3/ADP1147-5

–6–

REV. 0

3.3V

0V

(a) Continuous Mode Operation

3.3V

0V

(b) Power Saving Mode

Figure 19. CT Waveforms

1000pF

SHUTDOWN

P-DRIVE

SENSE(+)

SENSE(–)

ADP1147-3.3

ITH

CT

VIN

1 F

RSENSE

VOUT

1k

3300pF

CT

390pF

VIN

GROUND

CIN

D1

P-CHANNEL

L

SHUTDOWN

COUT

GROUND

PLANE

Figure 20. Circuit Diagram Indicating the Recommended

Ground Plane Scheme for PCB Layout

1

2

3

4

U1

ADP1147-5

P-DRV

SNS–

ITH

CT

VIN

GND

SHD

SNS+

R3

100

R4

100

R2

0.02

VOUT 5V/3A

C7

2.2nF

C9–C11

220 F

10V

OS-CON

+

R1

1k

C6

3.3nF

C5

470pF

L1

50 H

+

C1

1 F

D3

1N4148

R5

20k

R6

470

Q1

2N3906

Q2

2N2222

R7

220

Q4

IRF7403

Q3

VN2222LL

D2

30BQ040

+

C2-C4

220 F/16V

OS-CON

C8

1 F

D1

1N4148

VIN

6V TO 14V

8

7

6

5

Figure 21. 5 V/3 A Regulator Using N-Channel Device

IRF7204

L*

50 H

1nF

SHUTDOWN

GND

P-DRIVE

SENSE(+)

SENSE(–)

ADP1147-3.3

ITH

CT

VIN

1 F

RSENSE**

50m

VOUT

3.3V/2A

RC

1k

3300pF

CT

620pF

VIN

4V–14V

D1

30BQ040

SHUTDOWN

COUT

220 F

6.3V

X2

CIN

100 F

25V

*COILTRONICS

CTX50-4

**KRL SL-1-C1-0R050J

Figure 22. 3.3 V/2 A Regulator

LOAD CURRENT – mA

100

95

60

1

10K

10

100

1K

80

75

70

65

90

85

VIN = 6 VOLTS

VIN = 10 VOLTS

Figure 23. Efficiency vs. Load Current at VO = 3.3 V;

Figure 22 Circuit

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