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SC644 Datasheet(PDF) 4 Page - Semtech Corporation

Part # SC644
Description  Light Management Unit with 4 LDOs and SemPulse짰Interface
PDF  26 Pages
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Manufacturer  SEMTECH [Semtech Corporation]
Direct Link  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SC644 Datasheet(HTML) 4 Page - Semtech Corporation

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SC644
4
Parameter
Symbol
Conditions
Min
Typ
Max
Units
Charge Pump Electrical Specifications (Cont.)
.5x Mode to 2x Mode
Falling Transition Voltage
V
TRANS.5x
I
OUT = 50mA, IBLn = 0mA, VOUT = 4.2V
(5)
2.9
V
2x Mode to .5x Mode Hysteresis
V
HYST.5x
I
OUT = 50mA, IBLn = 0mA, VOUT = 4.2V
(5)
520
mV
Current Sink Off-State
Leakage Current
I
BL/FL(OFF)
V
IN = VBLn = 4.2V
0.

µA
Pump Frequency
f
PUMP
V
IN = 3.2V
250
kHz
LDO Electrical Specifications
LDO, LDO3, and LDO4
Voltage Setting Range
V
LDOm
(6)
Range of nominal settings
.5
3.3
V
LDO2 Voltage Setting Range
V
LDO2
Range of nominal settings
.2
.8
V
Output Voltage Accuracy
∆V
LDO
I
LDO = mA, TA = 25°C, 2.9V ≤ VIN ≤ 4.2V
-3
±.0
+3
%
I
LDO = mA to 00mA, 2.9V ≤ VIN ≤ 4.2V
-3.5
+3.5
%
Dropout Voltage(6)(7)
V
Dm
I
LDOm = 50mA, VIN = VLDOm + VDm
50
200
mV
Current Limit
I
LIM
200
mA
Line Regulation
DV
LINE
I
LDOm = mA,
V
IN = 2.9V to 4.2V, VLDOm = 2.8V
2.
7.2
mV
I
LDO2 = mA,
V
IN = 2.9V to 4.2V, VLDO2 = .8V
.3
4.8
Load Regulation
DV
LOAD
V
LDOm = 3.3V,
I
LDOm = mA to 00mA
25
mV
V
LDO2 = .8V,
I
LDO2 = mA to 00mA
20
Power Supply Rejection Ratio
PSRR
m
.5V < V
LDOm < 3.0V, f < kHz, CBYP = 22nF,
I
LDOm = 50mA, with 0.5VP-P supply ripple
50
dB
PSRR
2
.2V < V
LDO2 < .8V, f < kHz, CBYP = 22nF,
I
LDO2 = 50mA, with 0.5VP-P supply ripple
60
Output Voltage Noise
e
n-LDOm
0Hz < f < 00kHz, C
BYP = 22nF,
C
LDOm = µF, ILDOm = 50 mA,
.5V < V
LDOm < 3.0V
75
µV
RMS
e
n-LDO2
0Hz < f < 00kHz, C
BYP = 22nF,
C
LDO2 = µF, ILDO2 = 50 mA,
.2V < V
LDO2 < .8V
50
Minimum LDO Capacitor (8)
C
LDO(MIN)
Nominal value for C
LDOn

µF
Electrical Characteristics (continued)



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