SC4620 Просмотр технического описания (PDF) - Semtech Corporation

Номер в каталоге

Компоненты Описание

производитель

SC4620

Low Input Voltage, High Effciency, 2.5A Integrated FET Synchronous Step down DC/DC Regulator

Semtech Corporation 

SC4620

POWER MANAGEMENT

OTyppeicratlioPnerformaOnvecrecuCrhreanrtapcrotteercitsiotincs (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

VVpPhHaAsSeE

1us/DIV

FigurIent9e.rSnyanl cPhMroOniSzaRtiDoSnON

Internal

130

PMOS

RDSON

@

Room

Temperature

2.5Vin

120

110

3.3Vin

100

90

80

70

60

5Vin

1

1.5

2

2.5

IOIUoT((AA))

Figure 11. High-Side P-MOSFET

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˃

5Vin

2.5Vin

3.3Vin

˃ˁˈ

˄ˁ˃

˄ˁˈ

˅ˁ˃

˅ˁˈ

Oˢüṫ̃p̈u̇ʳt˖̈C̅̅u˸ŕṙʻe˔nʼ t(A)

FiguIrnete1r0n.aEl NffiMciOenScRy(DVSINO)N

80 Internal NMOS RDSON @ Room Temperature

75

2.5Vin

70

65

3.3Vin

60

55

50

5Vin

45

1

1.5

2

2.5

IIoOU(TA()A)

Figure 12. Low-Side N-MOSFET

 2008 Semtech Corp.



www.semtech.com

Share Link: