SC2442 データシートの表示（PDF） - Semtech Corporation

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SC2442

High Performance Wide Input Range Dual Synchronous Buck Controller

Semtech Corporation 

SC2442/H

POWER MANAGEMENT

Electrical Characteristics (Cont.)

Unless specified: TA = TJ = -40 to 125°C, VIN = 24V, VCC = 7V, Fc = 550KHz

Parameter

Symbol

Test Conditions

Min Typ Max Unit

Soft Start

Charging Current

Discharge Current

Error Amplifier

ISS1, ISS2

ISS1, ISS2

7

10 13 μA

-1

-2

-4 μA

Voltage Feedback Reference

Input Bias Current

Open Loop Gain (1)

Unity Gain Bandwidth (1)

Output Source/Sink Current

Output Slew Rate (1)

PWM to Output Delay (1)

Oscillator

VFB1, VFB2

IEABIAS

GDC

GBW

0.735 0.750 0.765 V

500

nA

70

dB

3

MHz

2

mA

1

V/μS

80

nS

Frequency Range

Clock Frequency

Oscillator Peak Voltage (1)

Fc

0.1

1.1 MHz

Fc

ROSC = 60K

490 550 610 kHz

Internal

3.0

V

Oscillator Valley Voltage (1)

Internal

1.5

V

Sync/Enable Input

Enable Thresheld Voltage

Disable Thresheld Voltage

Disable Low to Shut Down Delay (1)

VSYEN

VSYEN

SYNC/EN pin Voltage rising 1.8 2.0

V

SYNC/EN pin Voltage falling

0.8 1.0 V

SYNC/EN pin < 0.8V

50

nS

Sync Input High Level

Sync Input Low Level

Current Limit

VSYEN

VSYEN

TTL

V

TTL

V

OC1, OC2 Current Limit Sense

Feedback Threshold for Hiccup

OC Sense to Drive Turn Off Delay (1)

VOC1, VOC2

VFB1, VFB2

TOCDLY

-80 -105 -125 mV

0.450 0.525 0.610 V

80

nS

© 2007 Semtech Corp.

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