RT7250A/B
Typical Application Circuit
RT7250A
V
2
IN
3
VIN
BOOT
4V to 17V
C
IN
C
BOOT
10nF
L
10µF
15µH
1
5
V
OUT
SW
FB
3.3V
6
4
PGOOD
PGOOD
EN
R1
110k
Chip Enable
C
OUT
R2
36k
22µF x 2
7, 9 (Exposed Pad)
GND
RT7250B
V
2
IN
3
VIN
BOOT
4V to 17V
C
IN
C
BOOT
10nF
L
10µF
6.8µH
1
5
V
OUT
SW
FB
3.3V
6
4
PGOOD
PGOOD
EN
R1
47k
Chip Enable
C
OUT
R2
15k
22µF x 2
7, 9 (Exposed Pad)
GND
Table 1. Recommended Component Selection
RT7250A
V
OUT (V)
L (μH)
R1 (kΩ) R2 (kΩ) COUT (μF)
1.2
4.7
110
110
110
120
220
51
22 x 2
22 x 2
22 x 2
22 x 2
2.5
3.3
5
10
15
22
36
22
RT7250B
V
OUT (V)
1.2
L (μH)
3.6
R1 (kΩ) R2 (kΩ) COUT (μF)
47
47
47
62
91
22
15
12
22 x 2
22 x 2
22 x 2
22 x 2
2.5
4.7
3.3
6.8
5
10
Copyright 2012 Richtek Technology Corporation. All rights reserved.
©
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
2
DS7250A/B-01 May 2012
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
