RT7274/79/80/81
Typical Application Circuit
For TSSOP-14 (Exposed Pad) Package
L1
RT7279/80
VIN
2µH
13
V
10, 11
OUT
SW
V
IN
1.05V/2A
C6
0.1µF
C1
10µF x 2
C2
0.1µF
C7
22µF x 2
R1
14
C3
12
2
VINR
BOOT
FB
8.25k
Output Signal
R2
22k
5
1
R3 100k
6
7
3
GND
PVCC
PGOOD
Input Signal
EN
VOUT
PVCC
C4
1µF
8, 9, 15 (Exposed Pad)
4
SS
PGND
C5
3.9nF
For SOP-8 (Exposed Pad) Package
L1
2µH
RT7274/81
V
6
OUT
8
SW
VIN
V
IN
1.05V/2A
C1
C2
0.1µF
C7
22µF x 2
C6
10µF x 2
0.1µF
R1
C3
7
8.25k
1
BOOT
FB
EN
Enable
2
3
5, 9 (Exposed Pad)
GND
SS
R2
22.1k
4
PVCC
V
PVCC
C4
1µF
C5
3.9nF
Table 1. Suggested Component Values
V
(V)
R1 (kΩ)
6.81
R2 (kΩ)
22.1
C3 (pF)
L1 (μH)
C7 (μF)
OUT
1
1.05
1.2
1.8
2.5
3.3
5
--
--
--
2
22 to 68
22 to 68
22 to 68
22 to 68
22 to 68
22 to 68
22 to 68
22 to 68
8.25
22.1
2
12.7
22.1
2
30.1
49.9
73.2
124
180
22.1
22.1
22.1
22.1
22.1
5 to 22
5 to 22
5 to 22
5 to 22
5 to 22
3.3
3.3
3.3
4.7
4.7
7
Copyright 2013 Richtek Technology Corporation. All rights reserved.
©
is a registered trademark of Richtek Technology Corporation.
DS7274/79/80/81-01 February 2013
www.richtek.com
11
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
