LTC1149 查看數據表（PDF） - Linear Technology

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LTC1149

High Efficiency Synchronous Step-Down Switching Regulators

Linear Technology 

U

TYPICAL APPLICATIO S

LTC1149

LTC1149-3.3/LTC1149-5

+

1µF

VIN

5.5V TO 25V

1N4148

1N4148

0.047µF

220pF

0.068µF

3300pF

1k

1

PGATE

CAP 16

2

VIN

SHDN2 15

3

VCC

14

RGND

4

PDRIVE

NGATE 13

5

LTC1149-5

12

VCC

PGND

6

CT

S-GND 11

7

ITH

SHDN1 10

8 SENSE–

SENSE+ 9

*COILTRONICS CTX33-4 Kool Mµ

**KRL SL-1-C1-0R050J

Si9435DY

L*

33µH

+ 220µF

35V

RSENSE**

0.05Ω

Si9410DY

1N5818

VOUT

5V/2A

+ 220µF

10V × 2

AVX

SHUTDOWN

1000pF

1149 F12

Figure 12. Ultra Wide Input Range (5.5V to 25V) High Efficiency 5V Regulator

+

1µF

VIN

8V TO 16V

1N4148

1N4148

0.047µF

180pF

0.068µF

3300pF

1k

1

PGATE

CAP 16

2

VIN

SHDN2 15

3

VCC

RGND 14

4

PDRIVE

NGATE 13

5

VCC

LTC1149-5

PGND

12

6

CT

11

SGND

7

ITH

SHDN1 10

8 SENSE–

SENSE+ 9

*DALE LPE-6562-220MB

**KRL SL-1-C1-0R050J

Si9430DY

L*

22µH

+ 100µF

25V

RSENSE**

0.05Ω

Si9410DY

1N5818

VOUT

5V/2A

+ 220µF

10V

AVX

SHUTDOWN

1000pF

1149 F13

Figure 13. 250kHz High Efficiency 12V Input 5V/2A Output Regulator

17

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