SC4624 데이터 시트보기 (PDF) - Semtech Corporation

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SC4624

Low Input Voltage, High Efficiency, 4A Integrated FET Synchronous Step down DC/DC Regulator

Semtech Corporation 

SC4624

POWER MANAGEMENT

OTyppeicratlioPnerformaOnvecrecuCrhreanrtapcrotetercitsiotincs (Cont.)

Circuit condition: ApTpeslticcoandtiitioonn: 5Vcinir, c1Vuouitt#1, 5VIN, 1VOUT

0.6V/DIV

5.0V/DIV

VVoOuUt T

SSSS

Thermal protection

Test condition: 5Vin, 1Vout

0.6V/DIV

5.0V/DIV

VVOUoTut

SSSS

3.0V/DIV

100ms/DIV

Figure 7. Over Load Hiccup

SYNC

External clock singal=650kHz, duty=50%

VVphase

PHASE

Sync

Signal

2.0V/DIV

SYNC

2.0V/DIV

1us/DIV

Figure 9. Synchronization

VVpPhHaAsSeE

3V/DIV

VVPpHAhSaE se

1s/DIV

Figure 8. Thermal Shutdown Protection@0A

Efficiency

˄˃˃

ˌˈ

ˌ˃

ˋˈ

ˋ˃

ˊˈ

ˊ˃

ˉˈ

ˉ˃

ˈˈ

ˈ˃

ˇˈ

ˇ˃

˃ˁ˃

2.5Vin

5Vin

3.3Vin

˃ˁˈ ˄ˁ˃ ˄ˁˈ ˅ˁ˃ ˅ˁˈ ˆˁ˃ ˆˁˈ ˇˁ˃

Oˢü̇t̃p̈u̇ʳ˖t ̈C̅̅u˸ŕṙʻe˔nʼt(A)

Figure 10. Efficiency(VIN)

130 Internal PMOS RDSON @ Room Temperature

120

110

2.5VIN

100

90

3.3VIN

80

5VIN

70

1

2

3

4

IOUT (A)

Figure 11. High-Side P-MOSFET

 2008 Semtech Corp.



80 Internal NMOS RDSON @ Room Temperature

75

2.5VIN

70

65

3.3VIN

60

55

5VIN

50

1

2

IOUT (A)

3

4

Figure 12. Low-Side N-MOSFET

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