LTC3416 Просмотр технического описания (PDF) - Linear Technology
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LTC3416 Datasheet PDF : 16 Pages
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LTC3416
APPLICATIO S I FOR ATIO
Decoupling the PVIN and SVIN pins with two 100µF capaci-
tors on both switching regulators is adequate for most
applications.
The resitor values for the voltage divider on VOUT1 can be
calculated by using the following equation:
1.8V = 0.8V1+ RR21
Setting R1 to 200k results in a value of 255k for R2. To
calculate the resistor values for the voltage divider on
VOUT2, we can use the following equations:
R4
=
R3
2.5V
1.8V
–
1
2.5V = 0.8V1+ R4R+3R5
Setting R3 to 205k gives the following results: R4 = 78.7k
and R5 = 357k. Figure 6 shows the complete schematic for
this design example.
VIN
3.3V
CIN2**
100µF
2×
PGOOD
RPG2
100k
ROSC2
294k
7
PVIN
14
16
4
PVIN
SVIN
RUN
SW 8
SW 9
SW 12
SW 13
LTC3416
17 PGOOD
3
TRACK
VFB
19
6
NC
2 RT
NC 15
5 SGND
1 PGND
10 PGND
18
ITH
PGND 20
PGND 11
L2*
0.47µH
CFF2
22pF
X7R
R5
357k
R4
78.7k
R3
205k
RITH2
5.9k
CITH2
680pF
X7R
CC2
22pF
X7R
COUT2**
100µF
2×
VOUT2
2.5V
4A
VIN
3.3V
PGOOD
CIN1**
100µF
2×
RPG1
100k
ROSC1
294k
7
14
PVIN
16 PVIN
SVIN
4 RUN
SW 8
SW 9
SW 12
SW 13
LTC3416
17 PGOOD
3 TRACK
19
VFB
NC 6
2
RT
NC 15
5 SGND
1 PGND
10
PGND
ITH
18
20
PGND
11
PGND
L1*
0.47µH
CFF1
22pF
X7R
R2
255k
R1
200k
COUT1**
100µF
2×
VOUT1
1.8V
4A
RITH1
5.9k
CITH1
680pF
X7R
3416 F06
CC1
22pF
X7R
*TOKO FDVO630-R47M
**TDK C4532X5R0J107M
Figure 6. 1.8V and 2.5V, 4A Voltage Tracking Regulators at 1MHz
3416f
13
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