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LTC3418 bảng dữ liệu(PDF) 14 Page - Linear Technology

tên linh kiện LTC3418
Giải thích chi tiết về linh kiện  8A, 4MHz, Monolithic Synchronous Step-Down Regulator
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14
LTC3418
3418f
APPLICATIO S I FOR ATIO
Using a 0.2µH inductor results in a maximum ripple
current of:
∆ =
()
µ
()
⎛
⎝
⎜
⎞
⎠
⎟
⎛
⎝
⎜
⎞
⎠
⎟ =
I
V
MHz
H
V
V
A
L
25
10 2
1
25
33
303
.
.
–
.
.
.
COUT will be selected based on the ESR that is required to
satisfy the output voltage ripple requirement and the bulk
capacitance needed for loop stability. For this design, five
100µF ceramic capacitors will be used.
CIN should be sized for a maximum current rating of:
IA
V
V
V
V
A
RMS
RMS
=
()
⎛
⎝
⎜
⎞
⎠
⎟
=
8
25
33
33
25
13 43
.
.
.
.
–.
Decoupling the PVIN and SVIN pins with four 100µF
capacitors is adequate for this application.
The burst clamp and output voltage can now be pro-
grammed by choosing the values of R1, R2 and R3. The
voltage on the MODE pin will be set to 0.67V by the resistor
divider consisting of R2 and R3. A burst clamp voltage of
0.67V will set the minimum inductor current, IBURST, to
approximately 1.2A.
If we set the sum of R2 and R3 to 200k, then the following
equations can be solved.
RR
k
R
R
V
V
2
3
200
1
2
3
08
067
+=
+=
.
.
The two equations shown above result in the following
values for R2 and R3: R2 = 33.2k, R3 = 169k. The value
of R1 can now be determined by solving the equation:
1
1
202 2
25
08
1 430
+=
=
R
k
V
V
Rk
.
.
.
A value of 432k will be selected for R1. Figure 4 shows the
complete schematic for this design example.
PVIN
PVIN
PVIN
PVIN
PVIN
PVIN
PVIN
PVIN
SVIN
TRACK
PGOOD
RUN/SS
ITH
RT
SGND
PGND
PGND
PGND
PGND
1
2
11
12
20
21
30
31
25
27
38
37
36
34
33
32
19
18
16
3
4
9
10
22
23
28
29
24
35
5
7
26
6
8
13
14
15
17
SW
SW
SW
SW
SW
SW
SW
SW
VFB
SYNC/MODE
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
VREF
LTC3418
L1
0.2µH
C1
22pF
X7R
COUT
100µF
×5
CREF
2.2µF
X7R
CIN
100µF
×4
VIN
3.3V
VOUT
2.5V
8A
R1
432k
RPG
100k
RSS
2.2M
CSS
1000pF
X7R
CITH
820pF
X7R
RITH
7.5k
RSVIN
100Ω
ROSC 69.8k
R2
33.2k
R3
169k
VREF
C1
47pF
X7R
3418 F04
CIN, COUT: AVX 18126D107MAT
L1: TOKO FDV0620-R20M
CSVIN
1µF
X7R
Figure 4. 2.5V, 8A Regulator at 1MHz, Burst Mode Operation



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