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| 型号： | SC4539ULTRT |
| 厂商： | Semtech |
| 文件页数： | 4/14页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVR CONST CURRENT 8MLPD |
| 标准包装： | 1 |
| 恒定电流： | 是 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 680kHz ~ 920kHz |
| 电源电压： | 2.8 V ~ 5.5 V |
| 输出电压： | 5 V ~ 22 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-UFQFN 裸露焊盘 |
| 供应商设备封装： | 8-UMLP |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 85°C |
| 其它名称： | SC4539ULTRTDKR |
SC4539
Electrical Characteristics (continued)
Parameter
Symbol
Conditions
Min
Typ
Max
Units
Boost Converter Characteristics (continued)
Switch Leakage Current
Switch Saturation Voltage
I L(LX)
V SAT
V LX = 5.5V
I LX = 0.3A
0.01
250
1
450
μA
mV
COMP Sourcing Current
COMP Sinking Current
I COMP
V COMP = 0.9V, T A = 25oC
V COMP = 0.9V, T A = 25oC
5
6
μA
OUT Over-Voltage Protection
OUT Internal Pull-Down Current
V OVP
I OVP
During OVP condition
22
1
25
V
mA
OUT Bias Current
V EN = V IN , V OUT = 20V
50
70
μA
I OUT
OUT Leakage Current
V EN = 0V, V OUT = V IN = 5.5V
0.01
1
μA
PWM Dimming Frequency Range (1)(2)
PWM Dimming Duty Cycle Range (1)(2)
f EN
D EN
Applied to EN pin
200Hz on EN pin
100
0
50k
100
Hz
%
Current Sink Characteristics
BL Current Setting Range (3)
1
30
mA
I BL
BL Current Setting Accuracy
T A = 25°C
-3.5
3.5
%
BL Leakage Current
BL Current Line Regulation
BL Voltage
ISET Bias Voltage
ISET-to-I BL Gain
Start-Up Time
I L(BL)
ΔI BL /ΔV IN
V BL
V ISET
A ISET
t start-up
V EN = 0V, V BL = 2V
V IN = 3.0 to 5.5V
0.01
±0.05
0.35
0.5
230
1.3
0.1
μA
mA/V
V
V
A/A
μs
Notes:
(1) Guaranteed by design.
(2) See PWM Dimming description in the Applications Information section for limitations at high PWM dimming frequencies and low PWM
dimming duty cycles.
(3) Not recommended to program below 1mA with R ISET due to tolerance stackup. To produce output current less than 1mA, set the current >
1mA and use PWM dimming.
4
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