LTC3416

13

3416f

APPLICATIO S I FOR ATIO

tors on both switching regulators is adequate for most

applications.

calculated by using the following equation:

18

08

1

2

1

..

VV

R

R

=+









Setting R1 to 200k results in a value of 255k for R2. To

calculate the resistor values for the voltage divider on

RR

V

V

VV

RR

R

43

25

18

1

25

08

1

45

3

= 







=+

+









.

.

–

..

Setting R3 to 205k gives the following results: R4 = 78.7k

and R5 = 357k. Figure 6 shows the complete schematic for

this design example.

Figure 6. 1.8V and 2.5V, 4A Voltage Tracking Regulators at 1MHz

L2*

0.47

µH

22pF

X7R

R5

357k

R4

78.7k

LTC3416

RUN

PGOOD

TRACK

SGND

PGND

PGND

SW

SW

SW

SW

NC

NC

PGND

PGND

7

14

16

4

17

3

2

5

1

10

8

9

12

13

19

6

15

18

20

11

680pF

X7R

R3

205k

5.9k

100k

294k

100

µF

2

×

3.3V

PGOOD

100

µF

2

×

22pF

X7R

2.5V

4A

L1*

0.47

µH

22pF

X7R

R2

255k

RUN

PGOOD

TRACK

SGND

PGND

PGND

SW

SW

SW

SW

NC

NC

PGND

PGND

7

14

16

4

17

3

2

5

1

10

8

9

12

13

19

6

15

18

20

11

680pF

X7R

R1

200k

5.9k

100k

294k

TOKO FDVO630-R47M

TDK C4532X5R0J107M

*

**

100

µF

2

×

3.3V

PGOOD

100

µF

2

×

22pF

X7R

3416 F06

1.8V

4A

LTC3416