參數(shù)資料
型號(hào): LTC3620EDC#PBF
廠商: LINEAR TECHNOLOGY CORP
元件分類: 穩(wěn)壓器
英文描述: SWITCHING REGULATOR, 50 kHz SWITCHING FREQ-MAX, PDSO8
封裝: 2 X 2 MM, LEAD FREE, PLASTIC, DFN-8
文件頁數(shù): 5/18頁
文件大小: 318K
代理商: LTC3620EDC#PBF
LTC3620
13
3620fa
APPLICATIONS INFORMATION
A larger capacitor could be used to reduce this number.
Keep in mind that while a larger output capacitor will
decrease voltage ripple, it will also increase the transient
settling time. The optimal range for COUT should be be-
tween 1μF and 5μF.
The best way to select the feedback resistors is to select
a target combined resistance, and try different standard
1% resistor sizes to see which combination will give the
least error. For this example a target combined resistance
of around 1M will be used. By checking R1 values between
422k and 475k, and calculating R2 using the formula:
R2 =
0.6V
()R1
VOUT – 0.6V
it can be found that a value of R2 = 523k and R1 = 432k
minimizes the error in this range.
The error can be checked by solving for VOUT and nd-
ing the percent error from the desired 1.1V. Using these
resistor values will result in VOUT = 1.096V, and an error
of around 0.4%. Using different target resistor sums is
acceptable, but a smaller sum will decrease efciency at
lower loads, and a larger sum will increase noise sensitiv-
ity at the VFB pin.
Board Layout Checklist
When laying out the printed circuit board, the following
checklist should be used to ensure proper operation of
the LTC3620:
1. The power traces consisting of GND, SW and VIN should
be kept short, direct and wide.
2. The VFB pin should connect directly to the respective
feedback resistors, which should also have short, direct
paths to VOUT and GND respectively.
3. Keep COUT and CIN as close to the LTC3620 as
possible.
4. All parts connecting to ground should have their ground
terminals in close proximity to the LTC3620 GND
connection.
5. Keep the SW node and external clock, if used, away from
the sensitive VFB node. Also, minimize the length and
area of all traces connected to the SW pin, and always
use a ground plane under the switching regulator to
minimize interplane coupling.
4
1
2
3
6
5
7
8
SW
GND
3620 F04
VIN
RUN
VFB
NC
FMIN/MODE
LOBATB
R2
L
COUT
CIN
VIN
VOUT
R1
CFF*
*CFF = 22pF FEEDFORWARD CAPACITOR
+
4
1
2
3
6
5
7
8
SW
GND
3620 F05
VIN
RUN
VFB
NC
FMIN/MODE
LOBATB
L
COUT
VOUT
CIN
VIN
+
LTC3620 Layout Diagram
LTC3620-1 Layout Diagram
相關(guān)PDF資料
PDF描述
LTC3620EDC#TRMPBF SWITCHING REGULATOR, 50 kHz SWITCHING FREQ-MAX, PDSO8
LTC3620EDC-1#PBF SWITCHING REGULATOR, 50 kHz SWITCHING FREQ-MAX, PDSO8
LTC3620EDC-1#TRPBF SWITCHING REGULATOR, 50 kHz SWITCHING FREQ-MAX, PDSO8
LTC3625EDE-1#TRPBF POWER SUPPLY SUPPORT CKT, PDSO12
LTC3625IDE-1#PBF POWER SUPPLY SUPPORT CKT, PDSO12
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