RT7231/32/33/34
Typical Application Circuit
RT7231/32/33/34
V
IN
C1
10µF x 2
C2
0.1µF
VIN
VCC*
EN
PGOOD*
R3
100k
C4
1µF
C5
3.9nF
VREG5
SS
GND*
VS*
PGND
SW
BOOT
FB
R2
22k
C6
0.1µF
C3
R1
8.25k
C7
22µF x 2
L1
1.4µH
V
OUT
1.05V/4A
Input Signal
Power GOOD
* : VCC pin for TSSOP-14 (Exposed Pad) only.
VS pin for TSSOP-14 (Exposed Pad) only.
GND pin for TSSOP-14 (Exposed Pad) only.
PGOOD pin for TSSOP-14 (Exposed Pad) and WDFN-10L 3x3 only.
Table 1. Suggested Component Values (V
IN
= 12V)
V
OUT
(V)
1
1.05
1.2
1.8
2.5
3.3
5
7
R1 (kΩ)
6.81
8.25
12.7
30.1
49.9
73.2
124
180
R2 (kΩ)
22.1
22.1
22.1
22.1
22.1
22.1
22.1
22.1
C3 (pF)
--
--
--
5 to 22
5 to 22
5 to 22
5 to 22
5 to 22
L1 (μH)
1.4
1.4
1.4
2
2
2
3.3
3.3
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
Copyright
©
2013 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS7231/32/33/34-00
March 2013
www.richtek.com
7
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
