SC4539(2007) データシートの表示（PDF） - Semtech Corporation

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SC4539
(Rev.:2007)

High Efficiency Boost Converter for up to 6 LEDS

Semtech Corporation 

SC4539

Electrical Characteristics (continued)

Parameter

Boost Converter Characteristics (continued)

Switch Leakage Current

Switch Saturation Voltage

COMP Sourcing Current

COMP Sinking Current

OUT Over-Voltage Protection

OUT Internal Pull-Down Current

OUT Bias Current

OUT Leakage Current

PWM Dimming Frequency Range(1)

PWM Dimming Duty Cycle Range(1)

Current Sink Characteristics

BL Current Setting Range

BL Current Setting Accuracy

BL Leakage Current

BL Current Line Regulation

BL Voltage

ISET Bias Voltage

ISET-to-I Gain

BL

Start-Up Time

Notes:

(1) Guaranteed by design.

Symbol

I

L(LX)

V

SAT

I

COMP

V

OVP

I

OVP

I

OUT

f

EN

D

EN

I

BL

I

L(BL)

ΔI /ΔV

BL IN

V

BL

V

ISET

A

ISET

t

start-up

Conditions

V = 5.5V

LX

I = 0.3A

LX

V = 0.9V, T = 25ºC

COMP

A

V = 0.9V, T = 25ºC

COMP

A

During OVP condition

V = V , V = 20V

EN

IN OUT

V = 0V, V = V = 5.5V

EN

OUT

IN

Applied to EN pin

200Hz on EN pin

T = 25°C

A

V = 0V, V = 2V

EN

BL

V = 3.0 to 5.5V

IN

Min Typ Max Units

0.01

1

μA

250 450

mV

5

μA

6

22

25

V

1

mA

40

60

μA

0.01

1

μA

100

50k

Hz

0

100

%

1

30

mA

-3.5

3.5

%

0.01 0.1

μA

±0.05

mA/V

0.35

V

0.5

V

230

A/A

1.3

μs

4

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