SC2447 Просмотр технического описания (PDF) - Semtech Corporation

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SC2447

Dual-Phase, Single or Dual Output Synchronous Step-Down Controller

Semtech Corporation 

SC2447

POWER MANAGEMENT

Electrical Characteristics (Cont.)

Unless specified: AVCC = 12V, SYNC = 0, ROSC = 51.1kΩ, -40°C < TA = TJ < 125°C

Parameter

Symbol

Conditions

Output High Voltage

Output Low Voltage

Maximum Tri-State Leakage

Current

Propagation delay time from

current sense inputs to PWM

output(1)

TDLPWM

Soft-Start, Overload Hiccup and Enable

Source IO = 1.2mA, 0 ~ 70° C

Sink IO = 1mA

GDH in High Impedance State

TA =25° C

Soft-Start Charging Current

Overload Hiccup Enabling

Voltage

ISS1, ISS2

Soft-Start Discharging Current

at Over Current Condition

ISS1(DIS),

ISS2(DIS)

Overload Hiccup Threshold

Voltage

Overload Hiccup Recovery

Soft-Start Voltage

PWM Output Disable SS/EN

Voltage

PWM Output Enable SS/EN

Voltage

VSSRCV1,

VSSRCV2

Internal 0.5V Reference Buffer

VSS1 = VSS2 = 1.5V

VSS1 and VSS2 Increasing

VIN1-= 0.5VREF,VIN2-= 0.5VREFIN ,

VSS1 = VSS2 > 2.85V

VIN1-= 0.5VREF,VIN2-= 0.5VREFIN ,

VSS1 = VSS2 < 2.85V

VSS1 and VSS2 Decreasing

VSS1 and VSS2 Decreasing

Min Typ

4.1

0

85

9.5

3.2

37

7.5

2.85

0.5

1.2

Output Voltage

Load Regulation

VREFOUT

Line Regulation

Notes:

(1) Guaranteed by design, not tested in production.

IREFOUT = -1mA, 0° C < TA = TJ < 70° C 495 500

0 < I < -5mA

REFOUT

0.05

AVCCTH < AVCC < 15V, IREFOUT = -1mA

Max

5

0.4

2

0.6

1.5

505

0.02%

Units

V

V

µA

ns

µA

V

µA

µA

V

V

V

V

mV

%/mA

%V

© 2006 Semtech Corp.

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