LTC1149-5 查看數據表（PDF） - Linear Technology

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LTC1149-5

High Efficiency Synchronous Step-Down Switching Regulators

Linear Technology 

LTC1149

LTC1149-3.3/LTC1149-5

U

TYPICAL APPLICATIO S

+

1µF

1N4148

1N4148

0.047µF

390pF

0.068µF

3300pF

1k

1

PGATE

CAP 16

2

VIN

SHDN2 15

3

VCC

R-GND 14

4

P-DRIVE

13

NGATE

5

LTC1149-3.3

12

VCC

PGND

6

CT

11

SGND

7

ITH

SHDN1 10

8 SENSE–

SENSE+ 9

*COILTRONICS CTX02-11932

**DALE WSC-1/2-0.1

VIN

8V TO 20V

IRFR9024

L*

68µH

+ 100µF

35V

RSENSE**

0.1Ω

IRFR024

1N5818

VOUT

3.3V/1A

+ 220µF

6.3V

AVX

0V = NORMAL

>2V = SHUTDOWN

1000pF

1149 F10

Figure 10. High Efficiency 8V to 20V Input 3.3V/1A Output Regulator

+

3.3µF

1N4148

1N4148

0.047µF

470pF

0.068µF

3300pF

1k

1

PGATE

CAP 16

2

VIN

SHDN2 15

3

VCC

RGND 14

4

PDRIVE

13

NGATE

5

VCC

LTC1149-3.3

PGND

12

6

CT

SGND 11

7

ITH

SHDN1 10

8 SENSE–

SENSE+ 9

*COILTRONICS CTX33-4-KM

**KRL SL-1-C1-0R033J

VIN

8V TO 20V

IRF9Z34

L*

33µH

+ 220µF

35V

RSENSE**

0.033Ω

IRFZ34

1N5818

VOUT

3.3V/3A

+ 220µF

6.3V × 2

AVX

SHUTDOWN

1000pF

100Ω

100Ω

1149 F11

Figure 11. High Efficiency 8V to 20V Input 3.3V/3A Output Regulator

16

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