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CAT4238
V IN
C 1
L
47 m H
D
C 2
V OUT
4.7 m F
VIN
SW
0.22 m F
CAT4238
OFF ON
SHDN
FB
V FB = 300 mV
20 mA
GND
R 1
15 W
L: Sumida CDC5D23B ? 470
D: Central CMDSH05 ? 4
C2: Taiyo Yuden UMK212BJ224 (rated 50 V)
Figure 1. Typical Application Circuit
Table 1. ABSOLUTE MAXIMUM RATINGS
Parameters
V IN , FB voltage
SHDN voltage
SW voltage (Note 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
_ C
_ C
_ 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.
1. The SW pin voltage is rated up to 39 V for external continuous DC voltage.
Table 2. RECOMMENDED OPERATING CONDITIONS
Parameters
V IN
SW pin voltage
Ambient Temperature Range
NOTE:
Typical application circuit with external components is shown above.
http://onsemi.com
2
Range
up to 5.5
0 to 38
? 40 to +85
Units
V
V
_ C
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