CAT4240 Datasheet, PDF (2/12 Pages) Catalyst Semiconductor – 6 Watt Boost LED Driver

CAT4240
Table 1. ABSOLUTE MAXIMUM RATINGS
Parameters
Ratings
Units
V_IN, FB voltage
SHDN voltage
−0.3 to +7
V
−0.3 to +7
V
SW voltage
−0.3 to 60
V
Storage Temperature Range
−65 to +160
_C
Junction Temperature Range
−40 to +150
_C
Lead Temperature
300
_C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
Table 2. RECOMMENDED OPERATING CONDITIONS
Parameters
Range
V_IN
SW pin voltage
up to 5.5
0 to 38
Ambient Temperature Range (Note 1)
−40 to +85
NOTE: Typical application circuit with external components is shown on page 1.
1. Thin SOT23−5 package thermal resistance q_JA = 135°C/W when mounted on board over a ground plane.
Units
V
V
_C
Table 3. DC ELECTRICAL CHARACTERISTICS
(V_IN = 3.6 V, ambient temperature of 25°C (over recommended operating conditions unless otherwise specified))
Symbol
Parameter
Test Conditions
Min
Typ
I_Q
Operating Current
I_SD
Shutdown Current
V_FB
FB Pin Voltage
I_FB
FB pin input leakage
I_LED
Programmed LED Current
V_FB = 0.2 V
V_FB = 0.4 V (not switching)
V_SHDN = 0 V
6 LEDs with I_LED = 75 mA
R1 = 10 W
R1 = 5 W
0.6
0.1
0.1
285
300
28.5
30
60
V_IH
SHDN Logic High
V_IL
SHDN Logic Low
Enable Threshold Level
Shutdown Threshold Level
0.8
0.4
0.7
F_SW
Switching Frequency
DC
Maximum Duty Cycle
I_LIM
Switch Current Limit
V_IN = 3 V
V_IN = 3.6 V
V_IN = 5 V
0.8
1.0
92
600
750
R_SW
I_LEAK
Switch “On” Resistance
Switch Leakage Current
Thermal Shutdown
I_SW = 100 mA
1.0
Switch Off, V_SW = 30 V
2
150
Thermal Hysteresis
20
V_UVLO
Undervoltage Lockout (UVLO) Threshold
1.9
V_OV-SW
Overvoltage Detection Threshold
40
V_OCL
Output Voltage Clamp
“Open LED”
42
Max Units
1.5
mA
0.6
1
mA
315
mV
1
mA
31.5
mA
1.5
V
1.3
MHz
%
mA
2.0
W
5
mA
°C
°C
V
V
V
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