LTC1773EMS データシートの表示（PDF） - Linear Technology

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LTC1773EMS

Synchronous Step-Down DC/DC Controller

Linear Technology 

LTC1773

TYPICAL APPLICATIONS

47pF

30k

220pF

0.1µF

100pF

80.6k

1%

LTC1773

1

10

ITH

SW

2 RUN/SS SENSE– 9

3

SYNC/FCB

4

VFB

5

GND

8

VIN

7

TG

6

BG

118k

1%

100pF

0.1µF

2.7V ≤ VIN ≤ 6V

RSENSE

0.068Ω

L1

4.2µH

D1

MMSD914T1

VOUT

2V

800mA

+

CIN

47µF

6.3V

Si9801DY

4.7µF

6.3V

D2*

+

MBR0530LT1

COUT

47µF

6.3V

CIN, COUT: SANYO POSCAP 6TPA47M

L1: SUMIDA CDRH5D28 4R2

RSENSE: IRC LR1206-01-R068-F

*NOTE: D2 NOT NECESSARY.

IF REMOVED, EFFICIENCY DROPS BY 1%

1773 TA05

Figure 13. Single Lithium-Ion to 2V/800mA Regulator with

Current Foldback

47pF

30k

220pF

0.1µF

100pF

80.6k

1%

LTC1773

1

10

ITH

SW

2 RUN/SS SENSE– 9

3

SYNC/FCB

4

VFB

5

GND

8

VIN

7

TG

6

BG

100k

0.1µF

1%

100pF

CIN: PANASONIC SPECIAL POLYMER

COUT: KEMET T510687K004AS

L1: TOKO TYPE D104C 919AS-1RON

RSENSE: IRC LR2512-01-R010-J

RSENSE

0.01Ω

L1

1µH

2.7V ≤ VIN ≤ 6V

VOUT

1.8V

7A

+ CIN

150µF

6.3V

Si7540DP

+

D2*

MBRS340T3

COUT

680µF

4V

×2

*NOTE: D2 NOT NECESSARY.

IF REMOVED, EFFICIENCY DROPS BY 1%

4.7µF

6.3V

1773 TA08

Figure 14. 3.3V to 1.8V/7A Regulator

1773fb

18

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