CAT4238_07 Datasheet, PDF (2/14 Pages) Catalyst Semiconductor – High Efficiency 10 LED Boost Converter

CAT4238
ABSOLUTE MAXIMUM RATINGS
Parameters
VIN, FB voltage
S¯¯H¯D¯N¯ voltage
SW voltage⁽¹⁾
Storage Temperature Range
Junction Temperature Range
Lead Temperature
Ratings
-0.3 to +7
-0.3 to +7
up to 60
-65 to +160
-40 to +150
300
Units
V
V
V
ºC
ºC
ºC
Note:
(1) The SW pin voltage is rated up to 39V for external continuous DC voltage.
RECOMMENDED OPERATING CONDITIONS
Typical application circuit with external components are shown on page 1.
Parameters
VIN
SW pin voltage
Ambient Temperature Range
Range
up to 5.5
0 to 38
-40 to +85
Units
V
V
ºC
DC ELECTRICAL CHARACTERISTICS
VIN = 3.6V, ambient temperature of 25ºC (over recommended operating conditions unless specified otherwise).
Symbol Parameter
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_IH S¯¯H¯D¯N¯ Logic High
V_IL S¯¯H¯D¯N¯ Logic Low
F_SW Switching Frequency
DC Maximum Duty Cycle
Test Conditions
V_FB = 0.2V
V_FB = 0.4V (not switching)
V_{S¯¯H¯D¯N¯} = 0V
10 LEDs with I_LED = 20mA
Min
Typ
0.6
0.1
0.1
285
300
R1 = 10Ω
R1 = 15Ω
R1 = 20Ω
28.5
30
19
20
14.25 15
Enable Threshold Level
0.8
Shutdown Threshold Level
0.4
0.7
0.8
1.0
VIN = 3V
92
I_LIM
R_SW
I_LEAK
V_UVLO
Switch Current Limit
Switch “On” Resistance
Switch Leakage Current
Thermal Shutdown
Thermal Hysteresis
Undervoltage Lockout (UVLO)
Threshold
I_SW = 100mA
Switch Off, V_SW = 5V
350
450
1.0
1
150
20
1.9
V_OV-SW Overvoltage Detection Threshold
40
V_OCL Output Voltage Clamp
“Open LED”
42
Max
1.5
0.6
1
315
1
31.5
21
15.75
1.5
1.3
600
2.0
5
Units
mA
µA
mV
µA
mA
V
V
MHz
%
mA
Ω
µA
ºC
ºC
V
V
V
Doc. No. MD-5019 Rev. C
2
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice