L6911C

18/20

Application Circuit Examples

Figure 16 reports the schematic circuit for a motherboard chipset power supply. This application works from a

single 5V power supply and is able to deliver up to 10A with a 300KHz switching frequency.

Figure 16. Motherboard chipset power supply; 2.5Vout, 10A

CoilCraft DO5022 P

1 .5uH

CoilCraft DO3316 P

1uH

1k

3 x220u F

Sanyo

2 x1uF

ce ram ic

1n

5 x47 0uF

Sanyo TPB

STS12NF30L

STS12NF30L

STPS3 L25U

1 00nF

10A fuse

16

17

13

14

2

4

5

6

7

8

U1

L6911C

+5 VIN

VOUTCORE

PWRGD

10

15

9

3

20

18

11

19

12

1

VC C

GND

VID0

VID1

VID2

VID3

VID4

SS

OSC

O CSET

UGA TE

PH AS E

LG ATE

PGN D

PGO OD

VSEN

10k

220

1 00k

7 50k

2 20pF

6 80pF

5.6n

1 00n

1 00n

1N4148

GNDIN

GNDCORE

10k

43k