E-L5973AD Datasheet, PDF (16/22 Pages) STMicroelectronics – 2 A switch step down switching regulator

Application ideas
6
Application ideas
Figure 13. Positive buck-boost regulator
L5973AD
Figure 14. Buck-boost regulator
VIN = 5V
C1
10μF
10V
CERAMIC
C2
10μF
25V
CERAMIC
VREF
3.3V
VCC
SYNC.
COMP
C4
22nF
6
1
8 _L5973AD
2
4
3
5
7
INH
GND
C3
220pF
R3
4.7K
OUT
D1
STPS2L25U
2.7K
FB
24K
L1 15μH
C5
100μF
16V
VOUT=-12V/
0.6A
D03IN1455
Figure 15. Dual output voltage with auxiliary winding
D2
N1/N2=2 ^1N4148
VIN = 5V
C1
10μF
25V
CERAMIC
VREF
3.3V
VCC
SYNC.
COMP
C3
22nF
6
1
8 _L5973AD
2
4
3
5
7
INH
GND
C2
220pF
R3
4.7K
OUT
FB
Lp 22μH
D1
STPS25L25U
C4
100μF
10V
VOUT1=5V/
50mA
VOUT=3.3V/
0.5A
C5
47μF
10V
D03IN1456
16/22
Doc ID 9552 Rev 9