SC2677 Ver la hoja de datos (PDF) - Semtech Corporation

Número de pieza

componentes Descripción

Fabricante

SC2677

Dual Synchronous Voltage Mode Controller with Current Sharing Circuitry

Semtech Corporation 

SC2677

POWER MANAGEMENT

Electrical Characteristics (Cont.)

Unless Specified: VCC = 4.75 to 5.25V, GND = PGND = 0V, FB = VO, TJ = 25°C, VBSTC = VBST = 12V

Parameter

Conditions

Min Typ Max Units

Oscillator Frequency

Oscillator Max Duty Cycle

Phasing of DH2 and DL1

DH Sink Current

RSET = 2.5kohm

FOSC = 500kHz

VPHASING = 0.585V

DH - PGND = 3.5V

450

500 550

kHz

86

90

%

180

°C

1.7

A

DH Sink Current

DH - PGND = 2.5V

0.85

A

DH Source Current

BSTH - DH = 3.75V

1.7

A

DH Source Current

BSTH - DH = 3V

0.85

A

DL Sink Current

DL - PGNG = 3.5V

1.7

A

DL Sink Current

DL - PGND = 2.5V

0.85

A

DL Source Current

BSTL - DL = 3.75V

1.7

A

DL Source Current

BSTL - DL = 3V

0.85

A

Dead Time

Note 5

50

85

120

ns

Soft Start Charge Current (2)

50

µA

Soft Start Enable

0% duty cycle

400

mV

Soft Start End

100% duty cycle

825

mV

Soft Start Transition Threshold(2)

Synchronous mode

1.22

V

Power Good Threshold

Power Good Pull Down

VOUT ramping up

Sink Current = 2mA

83%

88%

93%

0.4

VOUT

V

NOTES:

(1) Measured from 50% to 50% pulse amplitude.

(2) The soft start pin sources 50µA to an external capacitor. The converter operates in synchronous mode

above the soft start transition threshold and in asynchronous mode below it.

(3) Power good is an open collector output which is pulled low when the output voltage is under 75%.

(4) This device is ESD sensitive. Use of standard ESD handling precautions is required.

(5) 120ns maximum at 70°C.

Marking Information

(TSSOP-20)

TOP

yyww = Datecode (Example: 9908)

xxxx = Semtech Lot # (Example: 90101)

© 2004 Semtech Corp.

3

www.semtech.com

Share Link: