L6910A L6910

16/21

5A Demo Board Description

The demo board shows the operation of the device in a general purpose application. The interanl reference is

used for the regulation. The external power mosfets are included in one SO8 package to save space and in-

crease power density.The 12V input rail supplies the device while the power conversion starts from the 5V input

rail. The device is also able to operate with a single supply voltage; in this case the jumper J1on the board bot-

Figure 14. 5A Demo Board Schematic

Figure 15. PCB and Components Layouts

Efficiency

Figure 16 shows the measured efficiency versus load current for different values of output voltage. The measure

was done at 5V and 12V input for different values of the output voltage (2.5V, 3.3V and 5V only when Vin=12V).

Output voltage has been changed modifying the value of R1 in the demo board as reported in the part list.

L1

R7

C1,C2

C7

C3, C4

Q1/2

Q1/1

13

14

10

11

3

1

U1

L6910

VIN (+5V)

VOUT

PWRGD

6

12

5

4

2

15

7

9

VCC

GND

VREF

SS

OSC

OCSET

UGATE

PHASE

LGATE

PGND

PGOOD

VFB

COMP

C19

R1

C9

C6

D1

GNDIN

GNDOUT

R2

C8

C5

R6

C18

8

R5

R3

R4

C20

EAREF

BOOT

R9

R8

R10

D2

C10

R11

GNDCC

J1

VCC (+12V)

Component Side

Solder Side