NCP1597B
APPLICATION CIRCUIT
4.0 V ? 5.5 V
V in
2 VCC
LX
8
3.3 m H
0.8 V ? 3.3 V
V out
EN
22 m F
3 VCCP
1
LX
FB
7
5
R1
22 m F
22 m F
6 NC
PGND 10
R2
4 AGND
PGND
9
Figure 2. Recommended Schematic for NCP1597B
ABSOLUTE MAXIMUM RATINGS
Rating
Power Supply Pin (Pin 4, 5) to GND
LX to GND
All other pins
Operating Temperature Range
Junction Temperature
Storage Temperature Range
Thermal Resistance Junction ? to ? Air (Note 1)
Symbol
V in
T A
T J
T S
R q JA
Value
6.5
? 0.3 (DC)
? 1.0 (t < 100 ns)
V in + 0.7
V in + 1.0 (t < 20 ns)
? 0.7 (DC)
? 5.0 (t < 100 ns)
6.0
? 0.3 (DC)
? 1.0 (t < 100 ns)
? 40 to +85
? 40 to +150
? 55 to +150
68.5
Unit
V
V
V
° C
° C
° C
° C/W
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. R q JA measured on approximately 1x1 inch sq. of 1 oz. Copper.
http://onsemi.com
3
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