CAT4237 Datasheet, PDF (2/13 Pages) Catalyst Semiconductor – High Voltage CMOS Boost White LED Driver

ABSOLUTE MAXIMUM RATINGS
Parameter
Rating
Unit
VIN, FB voltage
-0.3 to +7
V
SHDN* voltage
-0.3 to +7
V
SW voltage
-0.3 to 60
V
Storage Temperature Range
-65 to +160
°C
Junction Temperature Range
-40 to +125
°C
Lead Temperature
300
°C
RECOMMENDED OPERATING CONDITIONS
Typical application circuit with external components are shown on page 1.
Parameter
Range
Unit
VIN
2.8 to 5.5
V
SW pin voltage
0 to 30
V
Ambient Temperature Range
-40 to +85
°C
6, 7 or 8 LEDs
1 to 40
mA
CAT4237
ELECTRICAL OPERATING CHARACTERISTICS
VIN = 3.6V, ambient temperature of 25ºC (over recommended operating conditions unless specified
otherwise)
Symbol Parameter
Conditions
Min Typ Max Unit
I_Q Operating Current
I_SD Shutdown Current
V_FB FB Pin Voltage
I_FB FB pin input leakage
V_FB = 0.2V
V_FB = 0.4V (not switching)
V_SHDN* = 0V
8 LEDs with I_LED=20mA
0.6
1.5
mA
0.1
0.6
0.1
1
µA
285
300
315
mV
1
µA
R1 = 10Ω
I_LED Programmed LED Current _{R1 = 15Ω}
R1 = 20Ω
28.5
30
31.5
19
20
21
mA
14.25 15 15.75
V_IH SHDN* Logic High
V_IL SHDN* Logic Low
Enable Threshold Level
Shutdown Threshold Level
0.8
1.5
V
0.4
0.7
V
F_SW Switching Frequency
0.8
1.0
1.3
MHz
I_LIM Switch Current Limit
350
450
600
mA
R_SW Switch “On” Resistance
I_SW = 100mA
1.0
2.0
Ω
I_LEAK Switch Leakage Current
Switch Off, V_SW = 5V
1
5
µA
Thermal Shutdown
150
ºC
Thermal Hysteresis
20
ºC
V_UVLO
V_OV-SW
Undervoltage Lockout
(UVLO) Threshold
Overvoltage Threshold
1.9
V
35
V
© 2005 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
2 of 13
Doc. No. 5013, Rev. A