SC2447 데이터 시트보기 (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

Min Typ

Max

Units

Non-inverting Input Bias Current

IREFIN

Inverting Input Bias Current

IIN2-

Inverting Input Voltage for 2-Phase Single

Output Operation

Amplifier Transconductance

GM2

Amplifier Open-Loop Gain

aOL2

Amplifier Unity Gain Bandwidth(1)

Minimum COMP2 Switching Threshold

Amplifier Output Sink Current

Amplifier Output Source Current

Oscillator

VCS2+ = VCS2- = 0

VSS2 Increasing

V = 2.5V

COMP2

VCOMP2 = 2.5V

-100

-150

2.5

170

65

5

1.7

11

8.5

-250

-380

nA

nA

V

µΩ−1

dB

MHz

V

µA

µA

Channel Frequency

Synchronizing Frequency(1)

SYNC Input High Voltage

fCH1, fCH2

0 ~ 70°C

450 500

550

kHz

2.1fCH

kHz

1.5

V

SYNC Input Low Voltage

SYNC Input Current

Channel Maximum Duty Cycle

Channel Minimum Duty Cycle

Current-limit Comparators

ISYNC

DMAX1,

D

MAX2

D D MIN1, MIN2

VSYNC = 0.2V

VSYNC = 2V

0.5

V

1

50

µA

88

%

0

%

Input Common-Mode Range

Cycle-by-cycle Peak Current Limit

Positive Current-Sense Input Bias Current

Negative Current-Sense Input Bias

Current

PWM Outputs

VILIM1+,

VILIM2+

II

CS1+, CS2+

I I CS1-, CS2-

VCS1- = VCS2- = 0.5V,

Sourcing Mode, 0 ~ 70° C

VCS1+ = VCS1- = 0

VCS2- = VCS2- = 0

V =V = 0

CS1+

CS1-

VCS2+ = VCS2- = 0

Peak Source Current

Peak Sink Current

© 2006 Semtech Corp.

GDL1, GDL2,

GDH1, GDH2

GDL1, GDL2,

GDH1, GDH2

AVCC = 12V

AVCC = 12V

4

0

42.5

AVCC - 1.5 V

50

57.5

mV

-0.7

-2

µA

-0.7

-2

µA

10

mA

8

mA

www.semtech.com

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