RT7258
Typical Application Circuit
For WDFN-14L 4x3 Package
RT7258
V
IN
4.5V to 24V
4, 5, 6
C
IN
22µF
SW
12 VCC
C
VCC
1µF
R3
100k
Power Good
Chip Enable
2
3
PGOOD
EN/SYNC
GND
14, 15 (Exposed Pad)
FB
1
R2
20k
BG
8, 9, 10
13
VIN
BOOT
11
C
BOOT
1µF
L
2.2µH
V
OUT
3.3V
R1
62k
C
OUT
22µF x 4
Q1
For SOP-8 (Exposed Pad) Package
RT7258
V
IN
4.5V to 24V
8
C
IN
22µF
SW
3 VCC
C
VCC
1µF
FB
Chip Enable
7
EN/SYNC
GND
6
5, 9 (Exposed Pad)
R2
20k
BG
1
4
VIN
BOOT
2
C
BOOT
1µF
L
2.2µH
V
OUT
3.3V
R1
62k
C
OUT
22µF x 4
Q1
Table 1. Recommended Component Selection
V
OUT
(V)
1.2
1.8
2.5
3.3
5
8
R1 (kΩ)
62
70
69
62
93
120
R2 (kΩ)
127
57
33
20
18
13.5
L (μH)
1.5
1.5
2.2
2.2
2.8
3.6
C
OUT
(μF)
22μF x 4
22μF x 4
22μF x 4
22μF x 4
22μF x 4
22μF x 4
Copyright
©
2012 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS7258-00 January 2012
www.richtek.com
7
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
