SC4520 データシートの表示（PDF） - Semtech Corporation

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SC4520

3A Step-Down Switching Regulator with Adjustable Switching Frequency

Semtech Corporation 

SC4520

POWER MANAGEMENT

Electrical Characteristics (Cont.)

Unless specified: VIN = 12V, VCOMP = 0.8V, VBST = VIN + 5V, EN = tied to VIN, 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(1)

FB to VCOMP Voltage Gain(2)

FB to VCOMP

Transconductance(2)

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,

ROSC = 0

MIN

0.784

TYP

-0.25

0.8

+3

MAX

-1

0.816

UNITS

µA

V

mV/V

150 350

V/V

500 850 1300 µMho

70

110

µA

-70 -110

µA

4.3

A/V

0.6

V

2

V

0.25

V

85

%

Minimum Boost Voltage

Above Switch(2)

2.7

V

Boost Current

Enable Input Threshold

VETH

Voltage

ISW = 1A

ISW = 3A

10

15

mA

30

45

1.1

1.3

1.5

V

Enable Output Bias Current

IEOL

EN = 50mV below threshold

8

µA

IEOH

EN = 50mV below threshold

10

µA

Notes:

(1) The required minimum input voltage for a regulated output depends on the output voltage and load condition.

(2) Guaranteed by design.

 2006 Semtech Corp.

3

www.semtech.com

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