LT1946A Ver la hoja de datos (PDF) - Linear Technology

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LT1946A

2.7MHz Boost DC/DC Converter with 1.5A Switch and Soft-Start

Linear Technology 

TYPICAL APPLICATIO S

LT1946A

Triple Output TFT Supply Uses SEPIC Topology for Output Disconnect

D2

D3

VIN

12V ± 10%

+

L1

10µH

OFF ON

C1

2.2µF

6

5

C3

3 VIN

SHDN

SW 1µF

8

2

SS LT1946A FB

1

VC

COMP

GND*

CSS

100nF

7

4

D1

L2

10µH

C4

0.22µF

C5

0.22µF

R1

84.5k

R2

9.76k

VON

23V

10mA

VOFF

–12V

10mA

AVDD

12V

250mA

C2

20µF

C1–C5: X5R or X7R

C1: 2.2µF, 6.3V

C2: 2× 10µF, 16V

C3: 1µF, 25V

C4: 0.22µF, 25V

C5: 0.22µF, 16V

D1: MICROSEMI UPS120 OR EQUIVALENT

D2–D3: CENTRAL SEMI CMDSH-3

L1–L2: TDK RLF5018-100MR94

* EXPOSED PAD MUST ALSO BE GROUNDED

1946A TA09

2.794 ± 0.102

(.110 ± .004)

0.889 ± 0.127

(.035 ± .005)

MS8E Package

8-Lead Plastic MSOP

(Reference LTC DWG # 05-08-1662)

3.00 ± 0.102

(.118 ± .004)

(NOTE 3)

8 7 65

5.23

(.206)

MIN

2.083 ± 0.102 3.2 – 3.45

(.082 ± .004) (.126 – .136)

0.254

(.010)

DETAIL “A”

0° – 6° TYP

4.88 ± 0.1

(.192 ± .004)

0.42 ± 0.04

(.0165 ± .0015)

TYP

0.65

(.0256)

BSC

RECOMMENDED SOLDER PAD LAYOUT

GAUGE PLANE

0.53 ± 0.015

(.021 ± .006)

DETAIL “A”

1 234

1.10

(.043)

MAX

0.18

(.077)

NOTE:

1. DIMENSIONS IN MILLIMETER/(INCH)

2. DRAWING NOT TO SCALE

3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS.

MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE

4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.

INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE

5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX

SEATING

PLANE

0.22 – 0.38

(.009 – .015)

0.65

(.0256)

BCS

0.52

(.206)

REF

BOTTOM VIEW OF

EXPOSED PAD OPTION

2.06 ± 0.102

1

(.080 ± .004)

1.83 ± 0.102

(.072 ± .004)

3.00 ± 0.102

(.118 ± .004)

NOTE 4

8

0.86

(.34)

REF

0.13 ± 0.05

(.005 ± .002)

MSOP (MS8E) 1001

sn1946a 1946afs

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 represen-

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

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