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RT7253A 数据表(PDF) 13 Page - Richtek Technology Corporation

部件名 RT7253A
功能描述  3A, 17V, 340kHz Synchronous Step-Down Converter
PDF  14 Pages
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制造商  RICHTEK [Richtek Technology Corporation]
网页  http://www.richtek.com
标志 RICHTEK - Richtek Technology Corporation

RT7253A 数据表(HTML) 13 Page - Richtek Technology Corporation

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RT7253A
13
DS7253A-02 March 2011
www.richtek.com
(d) Copper Area = 50mm2 ,
θJA = 51°C/W
(e) Copper Area = 70mm2 ,
θJA = 49°C/W
Figure 6. Thermal Resistance vs. Copper Area Layout Design
Figure 8. 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
Layout Considerations
For best performance of the RT7253A, the following layout guidelines must be strictly followed.
Input capacitor must be placed as close to the IC as possible.
SW should be connected to inductor by wide and short trace. Keep sensitive components away from this trace.
The feedback components must be connected as close to the device as possible
VIN
VOUT
GND
GND
CP
CC
RC
SW
VOUT
COUT
L1
R1
R2
Input capacitor must
be placed as close
to the IC as possible.
SW should be connected to inductor by
wide and short trace. Keep sensitive
components away from this trace.
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
RS CS
GND
VIN
REN
CIN



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