RT7277
Typical Application Circuit
L1
1.4µH
RT7277
VIN
V
6
OUT
8
1
SW
V
IN
1.05V/3A
C1
C2
C7
22µF x 2
C6
0.1µF
10µF x 2
0.1µF
C3
R1
7
2
8.25k
Chip Enable
BOOT
FB
EN
5, 9 (Exposed Pad)
4
GND
SS
R2
22.1k
3
PVCC
V
PVCC
C5
3.9nF
C4
1µF
Table 1. Suggested Component Values
V
(V)
R1 (kΩ)
6.81
8.25
12.7
30.1
49.9
73.2
124
R2 (kΩ)
22.1
22.1
22.1
22.1
22.1
22.1
22.1
22.1
C3 (pF)
--
L1 (μH)
1.4
1.4
1.4
2
C7 (μF)
22 to 68
22 to 68
22 to 68
22 to 68
22 to 68
22 to 68
22 to 68
22 to 68
OUT
1
1.05
1.2
1.8
2.5
3.3
5
--
--
5 to 22
5 to 22
5 to 22
5 to 22
5 to 22
2
2
3.3
3.3
7
180
Copyright 2012 Richtek Technology Corporation. All rights reserved.
©
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
6
DS7277-00 October 2012
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
