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RT7270 Datasheet(PDF) 13 Page - Richtek Technology Corporation

Part # RT7270
Description  3A, 18V, 340kHz Synchronous Step-Down Converter
PDF  14 Pages
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Manufacturer  RICHTEK [Richtek Technology Corporation]
Direct Link  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

RT7270 Datasheet(HTML) 13 Page - Richtek Technology Corporation

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RT7270
13
DS7270-01
September 2012
www.richtek.com
Copyright
2012 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
©
Figure 7. PCB Layout Guide
Table 3. Suggested Capacitors for CIN and COUT
Location
Component Supplier
Part No.
Capacitance (
μF)
Case Size
CIN
MURATA
GRM31CR61E106K
10
1206
CIN
TDK
C3225X5R1E106K
10
1206
CIN
TAIYO YUDEN
TMK316BJ106ML
10
1206
COUT
MURATA
GRM31CR60J476M
47
1206
COUT
TDK
C3225X5R0J476M
47
1210
COUT
MURATA
GRM32ER71C226M
22
1210
COUT
TDK
C3225X5R1C22M
22
1210
VIN
VOUT
GND
CIN
GND
CP
CC
RC
SW
VOUT
COUT
L
R1
R2
Input capacitor must
be placed as close
to the IC as possible.
SW node is with high frequency voltage swing and should
be kept at small area. Keep analog components away from
the SW node to prevent stray capacitive noise pick-up
The feedback components
must be connected as close
to the device as possible.
BOOT
VIN
SW
GND
SS
EN
FB
COMP
GND
2
3
4
5
6
7
8
9
CSS
GND
VIN
REN
CBOOT



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