RT8073 Просмотр технического описания (PDF) - Richtek Technology
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RT8073 Datasheet PDF : 16 Pages
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RT8073
CC
RC
RGOOD
COMP 1
PGOOD 2
GND
CSS
SS 3
EN 4
REN
VIN 5
VIN 6
CIN must be placed
CIN
between VIN and GND
as closer as possible.
Connect the FB pin directly to feedback resistors. The
resistor divider must be connected between VOUT and GND.
GND
RFB2
RFB1
12 FB
11 RT
10 LX
RT GND VOUT LX should be connected to
9 LX
8 LX
13 7 BOOT
L
CBOOT
inductor by wide and short trace,
keep sensitive components away
from this trace.
GND
COUT
Output capacitor
must be near RT8073
Figure 7. PCB Layout Guide for WDFN-12L 3x3
CC
RC
COMP
REN GND
EN
VIN
CIN must be placed
CIN
between VIN and GND
as closer as possible.
Connect the FB pin directly to feedback resistors. The resistor
divider must be connected between VOUT and GND.
GND
8
2
7
PGND
3
6
9
4
5
RFB2 RFB1
FB
RT
RT
GND
LX
L
BOOT CBOOT
VOUT
LX should be connected to
inductor by wide and short trace,
keep sensitive components away
from this trace.
COUT
GND
Output capacitor
must be near RT8073
Figure 8. PCB Layout Guide for SOP-8 (Exposed Pad)
Recommended component selection for Typical Application
Table 2. Inductors
Component Supplier Series Inductance (μH) DCR (mΩ)
Wurth Elektronik No.744308033
0.33
0.37
Wurth Elektronik No.744355147
0.47
0.67
Current Rating (A)
27
30
Case Size
1070
1365
Component Supplier
TDK
TDK
Panasonic
Panasonic
TAIYO YUDEN
TAIYO YUDEN
TAIYO YUDEN
Table 3. Capacitors for CIN and COUT
Part No.
Capacitance (μF)
C3225X5R0J226M
22
C2012X5R0J106M
10
ECJ4YB0J226M
22
ECJ4YB1A106M
10
LMK325BJ226ML
22
JMK316BJ226ML
22
JMK212BJ106ML
10
Case Size
1210
0805
1210
1210
1210
1206
0805
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
www.richtek.com
14
is a registered trademark of Richtek Technology Corporation.
DS8073-01 November 2012
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