SC2441ITSTRT View Datasheet(PDF) - Semtech Corporation

Part Name

Description

MFG CO.

SC2441ITSTRT

Very Low Input Voltage 2-Phase Synchronous Step-down Controllers with Step-up Converter

Semtech Corporation 

SC2441

POWER MANAGEMENT

Electrical Characteristics (Cont.)

Unless specified: VIN = 2V, VCC = VBST1 = VBST1 =8V, SYNC/SHDN =2V, ROSC = 51.1kΩ, -40°C < TA = TJ < 85°C

Parameter

Symbol

Conditions

Oscillator

Step-down Channel Switching Frequency

Maximum Duty Cycle

Minimum Duty Cycle

SYNC/SHDN Synchronizing Frequency

SYNC/SHDN Input High Voltage

SYNC/SHDN Input Low Voltage

SYNC/SHDN Input Current

Shutdown Delay

f f OSC1, OSC2

DMAX1,

DMAX2

D D MIN1, MIN2

VS/SH

VS/SL

IS/S

ROSC = 51.1kΩ

ROSC = 51.1kΩ

ROSC = 51.1kΩ

ROSC = 51.1kΩ (Note 1)

VVSS//SS

=

=

0.2V

2V

(Note 1)

Current-Sense Amplifiers and Current-Limit Comparators

Current Limit Threshold

Current Limit Threshold

Positive Current-Sense Input Bias Current

Negative Current-Sense Input Bias Current

Minimum PWM On-time

Gate Drivers

VILIM1,

VILIM2

VILIM1,

VILIM2

ICS1(+),

ICS2(+)

I I CS1(-), CS2(-)

VCS1(-)V=CCV=CS28(-V) = 0V

VCS1(-)V=CCV=CS28(-V) = 5V

VCS1(+)

VCS2(-)

=

=

VCS1(-)

VCS2(-)

=

=

0

0

VCS1(+)

VCS2(+)

=

=

VCS1(-)

VCS2(-)

=

=

0

0

TA = 25°C, (Note 1)

High-Side Gate Drive Peak Source Current

(Note 1)

High-Side Gate Drive Peak Sink Current

(Note 1)

Low-Side Gate Drive Peak Source Current

(Note 1)

Low-Side Gate Drive Peak Sink Current

(Note 1)

Gate Drive Rise Time

Gate Drive Fall Time

Low-side Gate Drive to High-side Gate

Drive Non-overlapping Delay

CL = 3300pF

CL = 3300pF

CL = 0

High-side Gate Drive to Low-side Gate

Drive Non-overlapping Delay

CL = 0

Soft-Start, Overload Shutoff and Enable

Soft-Start Charging Current

Soft-Start Voltage to Enable Overload

Shutoff

Overload Shutoff FB Threshold

Soft-Start Discharge Current

Soft-Start Voltage to Recover From

Overload Shutoff

ISS1, ISS2

VSSEN1,

VSSEN2

VFBOL1,

VFBOL2

ISS1(DIS),

ISS2(DIS)

VSSRCV1,

VSSRCV2

VSS1 = VSS2 = 1.5V

VSS1 and VSS2 Increasing

FB1 aVndSS1F, B2 =2 D3e.8cVreasing

VVSFBS11

=

=

VVSFBS22

=

=

0.3V

3.8V

VSS1 and VSS2 Decreasing

Min Typ Max Units

470

510

550

KHz

88

90

%

0

%

1.2

2

MHz

1.5

V

0.5

V

1

µA

50

100

85

µs

40

48

56

mV

40

46.5

56

mV

-0.37

-1

µA

-0.32

-1

µA

180

ns

2

A

2

A

2

A

2

A

30

ns

30

ns

74

ns

62

ns

2.3

µA

3.25

V

0.348 0.36 0.372 V

1.4

µA

0.29 0.47 0.63

V

 2005 Semtech Corp.

3

www.semtech.com

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