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

CAT4237
V_IN
3 V to
4.2 V C₁
4.7 mF
OFF _ON
L
33 mH
D
V_OUT
C₂
SW 0.22 mF
VIN
CAT4237
SHDN
FB ^{VFB = 300 mV}
GND
R₁
15 W
20 mA
L: Sumida CDRH3D16−330
D: Central CMDSH05−4 (rated 40 V)
C2: Taiyo Yuden UMK212BJ224 (rated 50 V)
Figure 1. Typical Application Circuit
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 +55
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
V_IN
SW pin voltage
Ambient Temperature Range
6, 7 or 8 LEDs
Range
2.8 to 5.5
0 to 30
−40 to +85
1 to 40
NOTE: Typical application circuit with external components is shown above.
3. Thin SOT23−5 package thermal resistance q_JA = 135°C/W when mounted on board over a ground plane.
Units
V
V
_C
mA
http://onsemi.com
2