L5973D
APPLICATION IDEAS
Figure 14. Positive Buck-Boost regulator
L1
D2
15uH
STPS2L25U
VOUT=12V/0.6A
OUT
FB
Vcc
VIN=5V
8
1
5
D1
STPS2L25U
24k
L5973D
6
COMP
4
C4
100uF
16V
C1
10uF
10V
M1
2
3
7
STN4NE03L
C3
22nF
R3
C2
220pF
SYNC VREF
INH
GND
2.7k
Ceramic
4.7k
3.3V
Figure 15. Buck-Boost regulator
L1
15uH
OUT
FB
VIN=5V
Vcc
8
1
5
D1
L5973D
6
STPS2L25U
COMP
VOUT=-12V/0.6A
2.7k
24k
4
C1
10uF
10V
Ceramic
C2
10uF
25V
3
7
2
C5
C4
22nF
R3
C3
220pF
100uF
16V
INH
SYNC VREF
GND
Ceramic
4.7k
3.3V
Figure 16. Dual output voltage with auxiliary winding
D2
1N4148
VOUT1=5V
50mA
N1/N2=2
VIN=12V
Lp=22uH
VCC
OUT
FB
8
1
5
VOUT=3.3V
0.5A
D1
STPS25L25U
L5973D
6
COMP
4
C4
100uF
10V
C5
47uF
10V
C1
10uF
25V
3
2
7
C3
22nF
R3
C2
220pF
SYNC VREF
GND
INH
Ceramic
4.7k
3.3V
8/10
STMICROELECTRONICS [ ST ]
