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CAT4137TD Datasheet(PDF) 2 Page - Catalyst Semiconductor

Part # CAT4137TD
Description  CMOS Boost Converter - White LED Driver
Download  14 Pages
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Manufacturer  CATALYST [Catalyst Semiconductor]
Direct Link  http://www.catalyst-semiconductor.com
Logo CATALYST - Catalyst Semiconductor

CAT4137TD Datasheet(HTML) 2 Page - Catalyst Semiconductor

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CAT4137
Doc. No. MD-5012 Rev. B
2
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
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 40
V
Storage Temperature Range
-65 to +160
°C
Junction Temperature Range
-40 to +150
°C
Lead Temperature
300
°C
RECOMMENDED OPERATING CONDITIONS
Parameter
Range
Unit
VIN
2.2 to 5.5
V
SW pin voltage
0 to 24
V
Ambient Temperature Range
-40 to +85
°C
LED Bias Current
1 to 30
mA
ELECTRICAL OPERATING CHARACTERISTICS
VIN = 3.6V, ambient temperature of 25ºC (over recommended operating conditions unless specified otherwise)
Symbol Parameter
Conditions
Min
Typ
Max
Unit
IQ
Operating Current
VFB = 0.3V
VFB = 0.4V (not switching)
0.4
0.1
1.5
0.3
mA
ISD
Shutdown Current
VSHDN
¯¯¯¯¯ = 0V
0.1
1
µA
VFB
FB Pin Voltage
3 LEDs with ILED=20mA
285
300
315
mV
IFB
FB pin input leakage
0.1
1
µA
ILED
Programmed LED Current
R1 = 10Ω
R1 = 15Ω
R1 = 20Ω
28.5
19
14.25
30
20
15
31.5
21
15.75
mA
VIH
VIL
SHDN
¯¯¯¯¯ Logic High
SHDN
¯¯¯¯¯ Logic Low
Enable Threshold Level
Shutdown Threshold Level
0.4
0.8
0.7
1.5
V
V
FSW
Switching Frequency
0.7
1
1.3
MHz
ILIM
Switch Current Limit
250
300
400
mA
RSW
Switch “On” Resistance
ISW = 100mA
1.0
2.0
ILEAK
Switch Leakage Current
Switch Off, VSW = 5V
1
5
µA
TSD
Thermal Shutdown
150
ºC
THYS
Thermal Hysteresis
20
ºC
η
Efficiency
Typical Application Circuit
86
%
VUVLO
Under-voltage lock out
(UVLO) threshold
1.9
V
VOV-SW
Output Clamp Voltage
“Open LED” fault
29
V


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