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參數(shù)資料
| 型號(hào)： | SC4540ULTRT |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, 920 kHz SWITCHING FREQ-MAX, DSO8 |
| 封裝： | 2 X 2 MM, ROHS COMPLIANT, MLPD-8 |
| 文件頁數(shù)： | 10/15頁 |
| 文件大小： | 281K |
| 代理商： | SC4540ULTRT |
4
Electrical Characteristics (continued)
SC4540
Parameter
Symbol
Conditions
Min
Typ
Max
Units
Boost Converter Characteristics (continued)
Switch Over-Current Protection
I
OCP
425
725
mA
Switch Leakage Current
I
L(LX)
V
LX
= 12V
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
= 25C
5
μA
COMP Sinking Current
V
COMP
= 0.9V, T
A
= 25C
6
OUT Over-Voltage Protection
V
OVP
38
43
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
50
70
μA
OUT Leakage Current
V
EN
= 0V, V
OUT
= V
IN
= 12V
0.01
1
μA
PWM Dimming Frequency Range(1)(2)
f
EN
Applied to EN pin
100
50k
Hz
PWM Dimming Duty Cycle Range(1)(2)
D
EN
200Hz on EN pin
0
100
%
Current Sink Characteristics
BL Current Setting Range(3)
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
1μs
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.
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