Datasheet
LTC3416
13
3416fa
APPLICATIO S I FOR ATIO
WUUU
C
IN1
and C
IN2
should be sized for a maximum current
rating of:
IA
V
V
V
V
A
IA
V
V
V
V
A
RMS RMS
RMS RMS
1
2
4
18
33
33
18
1199
4
25
33
33
25
1171
=
⎛
⎝
⎜
⎞
⎠
⎟
=
=
⎛
⎝
⎜
⎞
⎠
⎟
=
.
.
.
.
–.
.
.
.
.
–.
Decoupling the PV
IN
and SV
IN
pins with two 100µF capaci-
tors on both switching regulators is adequate for most
applications.
The resitor values for the voltage divider on V
OUT1
can be
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
V
OUT2
, we can use the following equations:
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*
0.47µH
C
FF2
22pF
X7R
R5
357k
R4
78.7k
LTC3416
PV
IN
PV
IN
SV
IN
RUN
PGOOD
TRACK
R
T
SGND
PGND
PGND
SW
SW
SW
SW
V
FB
NC
NC
I
TH
PGND
PGND
7
14
16
4
17
3
2
5
1
10
8
9
12
13
19
6
15
18
20
11
C
ITH2
680pF
X7R
R3
205k
R
ITH2
5.9k
R
PG2
100k
R
SS
2.2M
C
SS
1000pF
R
OSC2
294k
C
IN2
**
100µF
2×
V
IN
3.3V
PGOOD
C
OUT2
**
100µF
2×
C
C2
22pF
X7R
V
OUT2
2.5V
4A
L1*
0.47µH
C
FF1
22pF
X7R
R2
255k
PV
IN
PV
IN
SV
IN
RUN
PGOOD
TRACK
R
T
SGND
PGND
PGND
SW
SW
SW
SW
V
FB
NC
NC
I
TH
PGND
PGND
7
14
16
4
17
3
2
5
1
10
8
9
12
13
19
6
15
18
20
11
C
ITH1
680pF
X7R
R1
200k
R
ITH1
5.9k
R
PG1
100k
R
OSC1
294k
TOKO FDVO630-R47M
TDK C4532X5R0J107M
*
**
C
IN1
**
100µF
2×
V
IN
3.3V
PGOOD
C
OUT1
**
100µF
2×
C
C1
22pF
X7R
3416 F06
V
OUT1
1.8V
4A
LTC3416