SC4505 Datasheet, PDF (3/15 Pages) Semtech Corporation – High Efficiency Boost Converter for Backlight/Flash LED Driver

POWER MANAGEMENT
Electrical Characteristics (Cont.)
Unless specified: V_IN = 3.6V, -40°C < T_A = T_J < 85°C, , R_O1SET=6.98KΩ R_O2SET=1.54KΩ
Parameter
Test Conditions
EN_FL, FL_TRB, EN_BL
Input Current
V_{EN_FL} = 0V to 4.7V
EN_BL PWM Dimming
Control Frequency
Note 1
EN_BL PWM Dimming
Control Duty Cycle
Note 1
FTO Sourcing Current
EN_FL = FL_TRB = 1
FTO Trip Threshold Voltage
FTO Pull Down Current
EN_FL = 1, FL_TRB = 0
Overvoltage Protection
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
Backlight Current Accuracy ( I _O1 )
Max Backlight Current ( I _O1 )
Flash Current Accuracy ( I _O2 )
Max Flash Current ( I _O2 )
Torch Output Current ( I _O2 )
I_O1 Off Leakage Current
I_O2 Off Leakage Current
V_O Pulldown in Overvoltage Fault
Note 1: Guaranteed by Design
EN_BL = 1
T_J = 25°C, R_O1SET =6.98KΩ
EN_FL = FL_TRB = 1
T_J = 25°C, R_O2SET =1.54KΩ
EN_FL=1, FL_TRB=0
T_J = 25°C, R_O2SET =1.54KΩ
V_IO1 =28V
V_IO2 =28V
SC4505
Min
Typ
Max Unit
0.01
1
µA
50
50K
Hz
0
100
%
1.2
µA
1.25
V
2.6
mA
28
V
155
°C
10
°C
19
20
21
mA
75
mA
92
100
108
mA
125
mA
18
mA
0.1
1
µA
0.1
1
µA
7
KΩ
 2006 Semtech Corp.
3
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