L5970D

8/10

APPLICATION IDEAS

Figure 16. Dual output voltage with auxiliary winding

Figure 17. Buck-Boost regulator

Figure 18. Positive Buck-Boost regul

Figure 19. Synchronization example

VIN=12V

C1

10uF

25V

Ceramic

D1

STPS25L25U

VCC

COMP

GND

OUT

FB

INH

SYNC VREF

L5970D

1

3

7

5

6

4

8

2

R3

4.7k

U1

C3

22nF

3.3V

VOUT=3.3V

0.5A

C2

220pF

VOUT1=5V

30mA

C5

47uF

10V

Lp=22uH

D2

1N4148

C4

100uF

10V

N1/N2=2

VIN=12V

C1

10uF

25V

Ceramic

D1

STPS2L25U

VCC

COMP

GND

OUT

FB

INH

SYNC VREF

1

3

7

5

6

4

8

2

R3

4.7k

U1

L1

33uH

2.7k

24k

C4

22nF

3.3V

C5

100uF

16V

L5970

VOUT=-12V/0.3A

C3

220pF

C2

10uF

35V

Ceramic

Vin=12V Vout=-12V

Iout=0.5A

Efficiency=81%

VIN=5V

C1

10uF

25V

Ceramic

D1

STPS2L25U

VCC

COMP

GND

OUT

FB

INH

SYNC VREF

L5970

1

3

7

5

6

4

8

2

R3

4.7k

U1

L1

33uH

24k

2.7k

C3

22nF

3.3V

C4

100uF

16V

VOUT=12V/0.3A

C2

220pF

D2

STPS2L25U

M1

STN4NE03L

Vin=5V Vout=12V Iout=0.3A Efficiency=76%

VCC

GND

OUT

FB

INH

SYNC VREF

1

3

7

5

6

4

8

2

L5970D

COMP

VCC

GND

OUT

FB

INH

SYNC VREF

1

3

7

5

6

4

8

2

L5970D

COMP

VIN