RT7080
Typical Application Circuit
Application Circuit 1 (With buck converter)
V5V
C3
1µF
A
*
C4
1µF
7
V5V
C1
0.1µF6
V5VN
5
C2
0.1µF4
12, 13, 15, 36,
41 (Exposed Pad)
D
2
V1P8
V1P8N
RT7080
VIN
VIN
18, 19
C8
PGND
27, 28
P
SW
31
L1
22µH
34
V
BUCK
R
FB1
R
FB2
C
F
47pF
D
R1
10
A
*
21, 22
U
V
23, 24
25, 26
VIN
Motor
V
BUCK
C9
4.7µF
SWGND
C7
0.1µF
D
P SWGND
DVSS
RSTN
FB
SWGND
D
ISP_SCL
ISP_SDA
UART_RX
UART_TX
V5V
40
1
37
38
Fault 39
D
V5V
VSP 10
AD7
W
A
*
OVP
11
AD6
VCP
CPP
CPN
DAC OUT 9
Dir
A
*
8
AD8
P0_10
P0_11
P0_6
P0_7
P0_15
VILDO
33
SWGND
30
4.7µF
(1%)
V
BUS
(1%)
17
16
14
C6
0.1µF
D1 (Option)
Shottky
1nF to 10nF
A
*
C5
0.1µF
ZD1 (Option)
11V
D
V5V
AD9
V5D
35
R2
C10 10
1µF
P
V5V
Note :
1. C1, C2, C3, C4, C
F
and L1 as close as possible to the IC.
2. C8 and C10 as close as possible to the IC and PGND.
3. C7 and C9 as close as possible to the IC and SWGND.
4. C1, C2 : Option. C1 and C2 are the decoupling capacitors.
5. L1 : The saturation current must be great than 400mA.
6. D1, ZD1: Option. D1 and ZD1 are for the application of hot swapping.
7. R
FB2
's GND must be connected to the DVSS to avoid the ground bounce.
8. *: AGND is a separate loop, do not connect to DGND and PGND.
Copyright
©
2019 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS7080-00 August 2019
www.richtek.com
5
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
