LTC1149 查看數據表（PDF） - Linear Technology

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LTC1149

High Efficiency Synchronous Step-Down Switching Regulators

Linear Technology 

LTC1149

LTC1149-3.3/LTC1149-5

U

TYPICAL APPLICATIO S

VIN

48V

1N4148

1N4148

+

3.3µF

0.047µF

620pF

0.068µF

3300pF

1k

1

PGATE

16

CAP

2

VIN

SHDN2 15

3

VCC

RGND 14

4

PDRIVE

NGATE 13

5

VCC

LTC1149-5

PGND

12

6

CT

SGND 11

7

ITH

SHDN1 10

8 SENSE–

SENSE+ 9

*HURRICANE LAB HL-KI168M

**IRC LR2512-01-R040-G

MTD2955

L*

68µH

+ 100µF

100V

RSENSE**

0.04Ω

IRFZ34

MBR380

0.1µF

VOUT

5V/2.5A

+ 220µF

10V

OS-CON

SHUTDOWN

1000pF

100Ω

100Ω

1149 F14

Figure 14. High Efficiency 48V Input 5V/2.5A Output Regulator

VIN

8V TO 20V

+

1µF

1N4148

0.047µF

390pF

1N4148

RFD15P05SM

+ 100µF

35V

0.068µF

3300pF

1k

1

PGATE

16

CAP

L*

50µH

2

VIN

SHDN2 15 SHUTDOWN

3

VCC

14

RGND

4

PDRIVE

13

NGATE

5

VCC

LTC1149

12

PGND

RFD14N05SM

6

CT

7

ITH

11

SGND

10

VFB

100pF

R1A

33k

1%

8 SENSE–

SENSE+ 9

1000pF

1N5818

R1B

43k

1%

RSENSE**

0.05Ω

R2

56k

1%

*COILTRONICS CTX50-2-MP

**IRC LR2010-01-R050-G

VOUT

3.3V/2A

OR 5V/2A

+ 220µF

10V × 2

AVX

VN2222LL

0V: VOUT = 3.3V

5V: VOUT = 5V

1149 F15

Figure 15. Logic Selectable 5V/2A or 3.3V/2A High Efficiency Regulator

18

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