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參數(shù)資料
| 型號： | SC627ULTRT |
| 廠商： | Semtech Corporation |
| 英文描述： | LED Light Management Unit Charge Pump, 4 LEDs, 700mA Flash LED, Dual LDOs, and SemWireTM Interface |
| 中文描述： | LED燈管理股電荷泵，4個LED，700mA的閃光LED，雙LDO，和SemWireTM接口 |
| 文件頁數(shù)： | 5/23頁 |
| 文件大?。?/td> | 371K |
| 代理商： | SC627ULTRT |
SC627
5
Electrical Characteristics (continued)
Parameter
Symbol
Conditions
Min
Typ
Max
Units
LDO Electrical Specifications
(continued)
Load Regulation
ΔV
LOAD
V
LDO1
= 3.3V, V
= 3.7V,
I
LDO1
= 1mA to 100 mA
25
mV
V
LDO2
= 1.8V, V
= 3.7V,
I
LDO2
= 1mA to 100 mA
20
Dropout Voltage
(5)
V
D
I
LDO1
= 100mA
100
150
mV
Current Limit
I
LIM
200
mA
Power Supply
Rejection Ratio
PSRR
LDO1
2.5V < V
LDO1
< 3V, f < 1kHz, C
= 22nF, I
LDO1
= 50mA,
V
IN
= 3.7V with 0.5V
P-P
ripple
50
dB
PSRR
LDO2
f < 1kHz, C
= 22nF, I
LDO2
= 50mA,
V
IN
= 3.7V with 0.5V
P-P
ripple
60
Output Voltage Noise
e
n-LDO1
LDO1, 10Hz < f < 100kHz, C
= 22nF, C
= 1μF,
I
LDO1
= 50 mA, V
IN
= 3.7V, 2.5V < V
LDO1
< 3V
100
μV
RMS
e
n-LDO2
LDO2, 10Hz < f < 100kHz, C
BYP
= 22nF, C
LDO
= 1μF,
I
LDO2
= 50 mA, V
IN
= 3.7V
50
Minimum Output Capacitor
C
LDO(MIN)
1
μF
Digital I/O Electrical Specifications (FLEN, SWIF)
Input High Threshold
V
IH
V
IN
= 5.5V
1.6
V
Input Low Threshold
V
IL
V
IN
= 3.0V
0.4
V
Input High Current
I
IH
V
IN
= 5.5V
-1
+1
μA
Input Low Current
I
IL
V
IN
= 5.5V
-1
+1
μA
SemWire Bit Rate
f
SWIF
10
75
kbit/s
SemWire Start-up Time
(6)
t
EN
1
ms
SemWire Disable Time
(7)
t
DIS
10
ms
SemWire Data Latch Delay
(8)
D
DL
5
bit
Notes:
(1) ΔV
(2) Once tripped, flash output will remain disabled until FLEN pin is cycled or reset via serial interface.
(3) Current matching equals ± [I
- I
] / [I
+ I
].
(4) Test voltage is V
= 4.0V — a relatively extreme LED voltage — to force a transition during test. Typically V
= 3.2V for white LEDs.
(5) Dropout is defined as (V
IN
- V
LDO1
) when V
LDO1
drops 100mV from nominal. Dropout does not apply to LDO2 since it has a maximum output voltage
of 1.8V.
(6) The SemWire start-up time is the minimum period that the SWIF pin must be held high to enable the part before commencing
communication.
(7) The SemWire disable time is the minimum period that the SWIF pin must be pulled low to shut the part down.
(8) The SemWire data latch delay is the maximum duration after communication has ended before the register is updated.
is the voltage difference between any two LEDs.
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