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RT8274 Datasheet(PDF) 11 Page - Richtek Technology Corporation

Part # RT8274
Description  The RT8274 is a high voltage buck converter
PDF  12 Pages
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Manufacturer  RICHTEK [Richtek Technology Corporation]
Direct Link  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

RT8274 Datasheet(HTML) 11 Page - Richtek Technology Corporation

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RT8274
11
DS8274-01
March 2011
www.richtek.com
Figure 4. PCB Layout Guide
Table 3. Suggested Capacitors for CIN and COUT
Component Sup plier
Series
Inductance (
µH)
DCR (m
Ω)
Current Rating (A) Dimensions (mm)
TDK
VLF10045
10
25
4.3
10x9.7x4.5
TAIYO YUDEN
NR8040
10
34
3.4
8x8x4
Table 2. Suggested Inductors for Typical Application Circuit
Component Supplier
Series
VRRM (V)
IOUT (A)
Package
DIODES
B330A
30
3
DO-214AC
DIODES
B340
40
3
DO-214AB
PANJIT
SK33
30
3
DO-214AB
PANJIT
SK34
40
3
DO-214AB
Table 4. Suggested Diode
Component Supplier
Part No.
Capacitance (
µF)
Case Size
MURATA
GRM31CR61E106K
10
1206
TDK
C3225X5R1E106K
10
1206
TAIYO YUDEN
TMK316BJ106ML
10
1206
MURATA
GRM31CR60J476M
47
1206
TDK
C3225X5R0J476M
47
1210
TAIYO YUDEN
EMK325BJ476MM
47
1210
MURATA
GRM32ER71C226M
22
1210
TDK
C3225X5R1C226M
22
1210
VIN
VOUT
GND
CIN
CB
2
3
4
5
8
7
6
GND
SS
BOOT
VIN
GND
SW
FB
EN
COMP
GND
CS
CP
CC
RC
SW
D1
VOUT
COUT
L1
Input capacitor must be placed
as close to the IC as possible.
The output capacitor must be
placed near the IC.
SW should be connected to inductor by
wide and short trace. Keep sensitive
components away from this trace.
The resistor divider must be connected
as close to the device as possible.
The parallel distance between
COMP and FB traces must be
as short as possible.



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