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CAT4139
Table 3. DC ELECTRICAL CHARACTERISTICS
(V IN = 3.6 V, ambient temperature of 25 ° C (over recommended operating conditions unless otherwise specified))
Symbol
I Q
I SD
V FB
Parameter
Operating Current
Shutdown Current
FB Pin Voltage
Test Conditions
V FB = 0.2 V
V FB = 0.4 V (not switching)
V SHDN = 0 V
9 x 3 LEDs, I OUT = 180 mA
Min
285
Typ
0.6
0.1
0.1
300
Max
1.5
0.6
1
315
Units
mA
m A
mV
I FB
FB pin input leakage
1
m A
I LED
V IH
V IL
F SW
I LIM
R SW
I LEAK
Programmed LED Current
SHDN Logic High
SHDN Logic Low
Switching Frequency
Switch Current Limit
Switch “On” Resistance
Switch Leakage Current
R1 = 10 W
R1 = 3 W
Enable Threshold Level
Shutdown Threshold Level
V IN = 3.6 V
V IN = 5 V
I SW = 100 mA
Switch Off, V SW = 5 V
28.5
0.4
0.8
600
750
30
100
0.8
0.7
1.0
1.0
1
31.5
1.5
1.3
2.0
5
mA
V
MHz
mA
W
m A
T SD
T HYST
V UVLO
Thermal Shutdown
Thermal Hysteresis
Under ? voltage lock out (UVLO) Threshold
150
20
1.9
° C
° C
V
V OV ? DET
V OCL
DC
Over ? voltage detection threshold
Output Clamp voltage
Maximum duty cycle
Minimum duty cycle
“Open LED”
23
24
29
92
16
V
V
%
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