SC4518H 데이터 시트보기 (PDF) - Semtech Corporation

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SC4518H

600kHz, 2A Step-Down Switching Regulator

Semtech Corporation 

POWER MANAGEMENT

Electrical Characteristics (Cont.)

Unless specified: VIN = 12V, VCOMP = 0.8V, VBST = VIN + 5V, EN = tied to VIN, SYNC = 0, SW = open.

TA = TJ = -40°C to 125°C.

PARAMETER

SYMBOL

CONDITIONS

FB Input Current

IFB

Feedback Voltage

Feedback Voltage Line

Regulation

4.4V < VIN < 24V(2)

FB to VCOMP Voltage Gain(3)

FB to VCOMP

Transconductance(3)

0.9V ≤ VCOMP ≤ 2.0V

∆ ICOMP = ± 10µA

VCOMP Pin Source Current

VCOMP Pin Sink Current

VCOMP Pin to Switch Current

Transconductance

VFB = 0.6V

VFB = 1.0V

VCOMP = 1.25V

VCOMP Pin Maximum Switching

Threshold

Duty cycle = 0%

VCOMP OCP Threshold

VCOMP Hiccup Retry Threshold

Maximum Switch Duty Cycle

VCOMP rising

VCOMP falling

VCOMP = 1.2V, ISW = 400mA

Minimum Boost Voltage

Above Switch (3)

Boost Current

ISW = 0.5A

ISW = 2A

SC4518H

MIN TYP MAX UNITS

-0.25 -1

µA

0.784 0.8 0.816 V

+3

mV/V

150 350

V/V

500 850 1300 µMho

70 110

µA

-70 -110 µA

3

A/V

0.6

V

2

V

0.25

V

85

%

2.7

V

10

15

mA

30

45

 2007 Semtech Corp.

3

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