RT8251
Marking Information
RT8251GQW
GE= : Product Code
YMDNN : Date Code
RT8251GSP
RT8251GSP : Product Number
GE=YM
DNN
RT8251
GSPYMDNN
YMDNN : Date Code
Typical Application Circuit
V
IN
4.75V to 24V
Chip Enable
1, 2, 3,
15, 16
C
IN
10µF x 2
VIN
BOOT
RT8251
7 EN
8 SS
9
C
BOOT
L
100nF 4.7µH
D
B540C
R
C
22k
R1
30.9k
R2
10k
V
OUT
3.3V/5A
C
OUT
22µF x 2
SW 10 to 14
FB 5
C
SS
10nF
4,
Exposed Pad (17)
GND
COMP
6
C
C
2.2nF
C
P
(Open)
Figure 1. Typical Application Circuit for WQFN-16L 3x3
V
IN
4.75V to 24V
Chip Enable
2
C
IN
10µF x 2
VIN
BOOT
RT8251
SW
1
3
C
BOOT
100nF
D
B540C
C
C
2.2nF
L
4.7µH
R1
30.9k
R2
10k
V
OUT
3.3V/5A
C
OUT
22µF x 2
7 EN
8 SS
4,
Exposed Pad(9)
GND
C
SS
10nF
FB 5
COMP
6
R
C
22k
C
P
NC
Figure 2. Typical Application Circuit for SOP-8 (Exposed Pad)
Table 1. Recommended Component Selection
V
OUT
(V)
R1 (kΩ)
R2 (kΩ)
R
C
(kΩ)
C
C
(nF)
L1 (μH)
C
OUT
(μF)
15
10
8
5
3.3
2.5
1.8
1.2
182
115
91
52.3
30.9
21.5
12.4
4.99
10
10
10
10
10
10
10
10
51
43
39
30
22
16
13
13
1
1.2
1.5
1.5
2.2
2.2
2.2
2.2
22
10
10
6.8
4.7
4.7
2.2
2.2
44
44
44
44
44
44
44
44
Copyright
©
2013 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
2
DS8251-04 February 2013
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
