SC4605 Ver la hoja de datos (PDF) - Semtech Corporation

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componentes Descripción

Lista de partido

SC4605

Low Input, High Efficiency Synchronous, Step Down Controller

Semtech Corporation 

SC4605

POWER MANAGEMENT

Applications Information (Cont.)

Design Example 4: 5V to 3.3V @ 5A application with SC4605 and its typical efficiency characteristics.

R3

2.87k

C1

220p

C14

0.1u

C2 2.2n

R1

14.3k

D2

1u

C71

R13

1

U1

1 BST

C3

4.7u

2 VCC

3 ISET

DRVH 10

PHASE 9

DRVL 8

R12 C20

100 470pF

4 COMP

5 FSET

GND 7

VSENSE 6

S C 4605

R11

100

ON/OFF

2 x S i7882

V IN = 5 V

C10

C12

22u

22u

R6

M1

1.0

ETQ P 6F2R 5

2.5u

C7

C6

R5

M2

150u 150u

1.0

GND 1

2

3

4

5

ON/OFF6

J1

V O U T = 3 .3 V /5 A

C5

C4

C9

22u

22u

10n

R7

4.7k

R8

97.6

R9

1.5k

1

2

3

4

5

J2

R10

TRIM

100

Figure 8. Schematic for 5V/3.3V@ 5A with SC4605 application

Efficiency vs Load current

0.98

0.97

0.96

0.95

0.94

0.93

0.92

0.91

0.9

Vo=3.3V

1

2

3

4

5

Load current (A)

Vin=5V

 2004 Semtech Corp.

14

www.semtech.com

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