cat4237 Catalyst Semiconductor, cat4237 Datasheet - Page 2

• Manufacturer Part Number: cat4237
• Description: High Voltage Cmos Boost White Led Driver
• Manufacturer: Catalyst Semiconductor

CAT4237
ABSOLUTE MAXIMUM RATINGS
RECOMMENDED OPERATING CONDITIONS
Typical application circuit with external components are shown on page 1.
Note:
(1) Thin SOT23-5 package thermal resistance θ
DC ELECTRICAL CHARACTERISTICS
V
Doc. No. MD-5013, Rev. B
Parameters
V
SHDN
¯¯¯¯¯ voltage
SW voltage
Storage Temperature Range
Junction Temperature Range
Lead Temperature
Parameters
V
SW pin voltage
Ambient Temperature Range
6, 7 or 8 LEDs
IN
Symbol
IN
IN
V
V
= 3.6V, ambient temperature of 25ºC (over recommended operating conditions unless specified otherwise).
I
R
, FB voltage
I
F
V
OV-SW
I
LEAK
V
V
I
I
UVLO
LED
I
LIM
SD
FB
SW
SW
Q
FB
IH
IL
Parameter
Operating Current
Shutdown Current
FB Pin Voltage
FB pin input leakage
Programmed LED Current
SHDN
SHDN
Switching Frequency
Switch Current Limit
Switch “On” Resistance
Switch Leakage Current
Thermal Shutdown
Thermal Hysteresis
Undervoltage Lockout
(UVLO) Threshold
Overvoltage Threshold
¯¯¯¯¯ Logic High
¯¯¯¯¯ Logic Low
JA
-65 to +160
-40 to +150
-40 to +85
2.8 to 5.5
-0.3 to +7
-0.3 to +7
-0.3 to 55
= 135°C/W when mounted on board over a ground plane.
Ratings
0 to 30
1 to 40
Range
300
V
V
V
8 LEDs with I
R1 = 10Ω
R1 = 15Ω
R1 = 20Ω
Enable Threshold Level
Shutdown Threshold Level
I
Switch Off, V
SW
FB
FB
¯¯¯¯¯
SHDN
= 100mA
= 0.2V
= 0.4V (not switching)
= 0V
Conditions
Units
Units
mA
ºC
ºC
ºC
ºC
V
V
V
V
V
SW
LED
2
= 5V
=20mA
14.25
28.5
Min
285
350
0.8
0.4
19
Characteristics subject to change without notice
Typ
300
450
150
0.6
0.1
0.1
0.8
0.7
1.0
1.0
1.9
30
20
15
20
35
1
© Catalyst Semiconductor, Inc.
15.75
Max
31.5
315
600
1.5
0.6
1.5
1.3
2.0
21
1
1
5
MHz
Unit
mA
mV
mA
mA
µA
µA
µA
ºC
ºC
Ω
V
V
V
V