RT8279 Datasheet, PDF (13/14 Pages) Richtek Technology Corporation – 5A, 36V, 500kHz Step-Down Converter

RT8279
SW should be connected to inductor by
wide and short trace. Keep sensitive
components away from this trace.
SW
V_{OUT COUT}
V_{OUT R1}
C_BOOT
BOOT
NC
NC
FB
8
2
7
GND
3
6
9
4
5
L1
SW
VIN
GND
EN
C_OUT
D1
C_IN
C_IN
R2
The feedback components
should be connected as close
to the device as possible.
Input capacitor should be
placed as close to the IC
as possible.
GND
Figure 6. PCB Layout Guide
Table 3. Suggested Capacitors for C_IN and C_OUT
Location Component Supplier
Part No.
C_IN
C_IN
C_OUT
C_OUT
C_OUT
C_OUT
MURATA
TAIYO YUDEN
MURATA
TDK
MURATA
TDK
GRM32ER71H475K
UMK325BJ475MM-T
GRM31CR60J476M
C3225X5R0J476M
GRM32ER71C226M
C3225X5R1C22M
Capacitance (μF)
4.7
4.7
47
47
22
22
Table 4. Suggested Diode
Component Supplier Series
DIODES
B550C
PANJIT
SK55
V_RRM (V)
50
50
I_OUT (A)
5
5
Package
SMC
SMC
Case Size
1206
1206
1206
1210
1210
1210
DS8279-01 December 2011
www.richtek.com
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