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

VIN

12V TO 36V

1N4148

10k

2N3906

220Ω

+ 1000µF

63V

+

3.3µF

0.1µF

820pF

3300pF

1k

1

PGATE

CAP 16

2

VIN

SHDM2 15

3

VCC

14

RGND

4

PDRIVE

NGATE 13

5

VCC

LTC1149-5

12

PGND

6

CT

SGND 11

7

ITH

SHDN1 10

8 SENSE–

SENSE+ 9

VN2222LL

470Ω

0.1µF

2N2222

MUR110

MTP30N06EL L*

50µH

RSENSE**

0.02Ω

+

IRFZ44

MBR380

VOUT

5V/5A

220µF

10V × 2

OS-CON

0V = NORMAL

>2V = SHUTDOWN

1000pF

100Ω

100Ω

1149 F16

*COILTRONICS CTX50-5-52

**DALE LVR-3-0.02

SEE APPLICATIONS INFORMATION TO SUPPRESS

Burst ModeTM OPERATION AT LOW CURRENTS

Figure 16. 25W High Efficiency Regulator Using N-Channel MOSFET Switches

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PACKAGE DESCRIPTIO Dimensions in inches (millimeters) unless otherwise noted.

N Package

16-Lead PDIP (Narrow 0.300)

(LTC DWG # 05-08-1510)

0.300 – 0.325

(7.620 – 8.255)

0.130 ± 0.005

(3.302 ± 0.127)

0.045 – 0.065

(1.143 – 1.651)

0.009 – 0.015

(0.229 – 0.381)

0.020

(0.508)

MIN

+0.035

0.325 –0.015

( ) 8.255

+0.889

–0.381

0.125

(3.175)

MIN

0.100 ± 0.010

(2.540 ± 0.254)

*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.

MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)

0.770*

(19.558)

MAX

16 15 14 13 12 11 10 9

0.065

(1.651)

TYP

0.255 ± 0.015*

(6.477 ± 0.381)

0.018 ± 0.003

(0.457 ± 0.076)

12

3

4

5

6

78

N16 1197

Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However,

no responsibility is assumed for its use. Linear Technology Corporation makes no representation that

the interconnection of its circuits as described herein will not infringe on existing patent rights.

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