SC1175 查看數據表（PDF） - Semtech Corporation

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SC1175

Low Power Dual Synchronous DC/DC Controller With Current Sharing Circuitry

Semtech Corporation 

SC1175

POWER MANAGEMENT

Electrical Characteristics (Cont.)

Unless Specified: VCC = 4.75 to 5.25V, GND = PGND = 0V, FB = VO, 0mV < (CS(+) - CS(-)) < 60mV , TJ = 25°C

PARAMETER

CONDITIONS

MIN

TYP MAX UNITS

DL Sink Current

DL Sink Current

DL Source Current

DL Source Current

Dead Time

Soft Start Charge Current (2)

Soft Start Enable

Soft Start End

Soft Start Transition(2)

Power Good Window(3)

Fold Back Current

Fold Back Voltage Knee

Input Bias Current

DL - PGND = 3.5V

DL - PGND = 1.75V

BSTL - DL = 5V

BSTL - DL = 2.5V

Note 5

0% duty cycle

100% duty cycle

Synchronous mode

VOUT = 0V

I = ILIM

-IN1, +IN2, -IN2

1

.5

1

.5

50

1.25

100 150

25

1.4

2.5

3.3

+10

50%

VOUT

1

A

A

A

A

ns

µA

V

V

V

%VOUT

I LIM

V

µA

NOTES:

(1) Specification refers to application circuit.

(2) The soft start pin sources 25µA 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 pulled low when the output voltage is outside the ±10% window.

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

(5) 200ns maximum at 70°.

 2004 Semtech Corp.

4

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