RT7272A Datasheet, PDF (13/14 Pages) Richtek Technology Corporation – 3A, 36V, 500kHz Synchronous Step-Down Converter

RT7272A
Input capacitor must be placed
as close to the IC as possible.
V_OUT
SW should be connected to
inductor by wide and short trace.
Keep sensitive components
away from this trace and C_BOOT. ^L
C_BOOT
V_IN
R_EN
The R_EN component
must be connected.
C_OUT
R_S* ^CS*
V_IN
C_IN
The R_L resistor must be connected
as close to the device as possible.
Keep sensitive components away.
SW
BOOT
EN
GND
8
2
7
GND
3
6
9
4
5
VIN
RLIM
COMP
FB
R1
R2
R_L
C_C RC
C_P
V_OUT
GND
* : Option
The Compensator and feedback
components must be connected as
close to the device as possible.
Figure 8. PCB Layout Guide
Location
C_IN
C_IN
C_IN
C_IN
C_IN
C_OUT
C_OUT
C_OUT
C_OUT
Table 3. Suggested Capacitors for C_IN and C_OUT
Component Supplier
Part No.
Capacitance (μF)
MURATA
GRM32ER71H475K
4.7
TAIYO YUDEN
UMK325BJ475MM-T
4.7
MURATA
GRM31CR61E106K
10
TDK
C3225X5R1E106K
10
TAIYO YUDEN
TMK316BJ106ML
10
MURATA
GRM31CR60J476M
47
TDK
C3225X5R0J476M
47
MURATA
GRM32ER71C226M
22
TDK
C3225X5R1C22M
22
Case Size
1206
1206
1206
1206
1206
1206
1210
1210
1210
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS7272A-01 January 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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