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參數(shù)資料
| 型號： | SC621ULTRT |
| 廠商： | Semtech Corporation |
| 英文描述： | LED Light Management Unit Charge Pump, 4 LEDs, 400mA Flash LED, Dual LDOs, and SemWireTM Interface |
| 中文描述： | LED燈管理股電荷泵，4個LED，400mA的閃光LED，雙LDO，和SemWireTM接口 |
| 文件頁數(shù)： | 4/23頁 |
| 文件大小： | 320K |
| 代理商： | SC621ULTRT |
SC621
4
Parameter
Symbol
Conditions
Min
Typ
Max
Units
Fault Protection (continued)
Charge Pump
Over-Voltage Protection
V
OVP
VOUT pin open circuit, V
OUT
= V
OVP
rising threshold
5.3
5.7
6.0
V
Undervoltage Lockout
V
UVLO
Decreasing V
IN
2.4
V
V
UVLO-HYS
300
mV
Charge Pump Electrical Specifications
Maximum Total Output
Current
I
OUT(MAX)
V
IN
> 3.4V, sum of all active LED currents,
V
OUT(MAX)
= 4.0V
500
mA
Backlight Current Setting
I
BL
Nominal setting for BL1 thru BL4
0.5
25
mA
Flash Current Setting
I
FL
Nominal setting for FL
50
400
mA
Backlight Current Accuracy
I
BL_ACC
V
IN
= 3.7V, I
BL
= 12mA, T
A
= 25°C
-8
±1.5
+8
%
Backlight Current Matching
I
BL-BL
V
IN
= 3.7V, I
BL
= 12mA
(3)
-3.5
±0.5
+3.5
%
Flash Current Accuracy
I
FL_ACC
V
IN
= 3.7V, I
FL
= 400mA, T
A
= 25°C
-15
+15
%
1x Mode to 1.5x Mode
Falling Transition Voltage
V
TRANS1x
I
OUT
= 40mA, I
BLn
= 10mA, V
OUT
= 3.2V
3.27
V
1.5x Mode to 1x Mode
Hysteresis
V
HYST1x
I
OUT
= 40mA, I
BLn
= 10mA, V
OUT
= 3.2V
250
mV
1.5x Mode to 2x Mode
Falling Transition Voltage
V
TRANS1.5x
I
OUT
= 40mA, I
BLn
= 10mA, V
OUT
= 4.0V
(4)
2.92
V
2x Mode to 1.5x Mode
Hysteresis
V
HYST1.5x
I
OUT
= 40mA, I
BLn
= 10mA, V
OUT
= 4.0V
(4)
300
mV
Current Sink Off-State
Leakage Current
I
BLn
V
IN
= V
BLn
= 4.2V
0.1
1
μA
Pump Frequency
f
PUMP
V
IN
= 3.2V
250
kHz
LDO Electrical Specifications
LDO1 Voltage Setting
V
LDO1
Range of nominal settings
in 100mV increments
2.5
3.3
V
LDO2 Voltage Setting
V
LDO2
Range of nominal settings
in 100mV increments
1.5
1.8
V
LDO1, LDO2 Output
Voltage Accuracy
V
LDO1,
V
LDO2
V
IN
= 3.7V, I
LDO
= 1mA
-3.5
±3
+3.5
%
Line Regulation
ΔV
LINE
LDO1, I
LDO1
= 1mA, V
OUT
= 2.8V
2.1
7.2
mV
LDO2, I
LDO2
= 1mA, V
OUT
= 1.8V
1.3
4.8
Electrical Characteristics (continued)
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