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SC4539 Datasheet(PDF) 4 Page - Semtech Corporation

Part # SC4539
Description  High Effi ciency Boost Converter for up to 6 LEDS
PDF  14 Pages
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Manufacturer  SEMTECH [Semtech Corporation]
Direct Link  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SC4539 Datasheet(HTML) 4 Page - Semtech Corporation

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4
Electrical Characteristics (continued)
SC4539
Parameter
Symbol
Conditions
Min
Typ
Max
Units
Boost Converter Characteristics (continued)
Switch Leakage Current
I
L(LX)
V
LX
= 5.5V
0.01
1
μA
Switch Saturation Voltage
V
SAT
I
LX
= 0.3A
250
450
mV
COMP Sourcing Current
I
COMP
V
COMP
= 0.9V, T
A
= 25ºC
5
μA
COMP Sinking Current
V
COMP
= 0.9V, T
A
= 25ºC
6
OUT Over-Voltage Protection
V
OVP
22
25
V
OUT Internal Pull-Down Current
I
OVP
During OVP condition
1
mA
OUT Bias Current
I
OUT
V
EN
= V
IN
, V
OUT
= 20V
40
60
μA
OUT Leakage Current
V
EN
= 0V, V
OUT
= V
IN
= 5.5V
0.01
1
μA
PWM Dimming Frequency Range(1)
f
EN
Applied to EN pin
100
50k
Hz
PWM Dimming Duty Cycle Range(1)
D
EN
200Hz on EN pin
0
100
%
Current Sink Characteristics
BL Current Setting Range
I
BL
130
mA
BL Current Setting Accuracy
T
A
= 25°C
-3.5
3.5
%
BL Leakage Current
I
L(BL)
V
EN
= 0V, V
BL
= 2V
0.01
0.1
μA
BL Current Line Regulation
ΔI
BL
/ΔV
IN
V
IN
= 3.0 to 5.5V
±0.05
mA/V
BL Voltage
V
BL
0.35
V
ISET Bias Voltage
V
ISET
0.5
V
ISET-to-I
BL
Gain
A
ISET
230
A/A
Start-Up Time
t
start-up
1.3
μs
Notes:
(1)
Guaranteed by design.



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