RT2805A
Typical Application Circuit
1
8
7
5
V
IN
VIN
EN
BOOT
RT2805A
C
5.5V to 36V
C
IN
BOOT
4.7µF/
50V x 2
L1
10nF
Chip Enable
SW
V
OUT
D1
Open = Automatic
Startup
B550A
C
FF
R1
R2
C
OUT
22µF x 2
6, 9 (Exposed Pad)
4
FB
GND
Table 1. Recommended Component Selection
VOUT (V)
R1 (kΩ)
100
R2 (kΩ)
100
CFF (pF)
L (μH)
6.8
10
COUT (μF)
2.5
3.3
5
82
82
82
82
22 x 2
22 x 2
22 x 2
22 x 2
100
58.6
31.6
18
100
15
8
100
22
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is a registered trademark of Richtek Technology Corporation.
www.richtek.com
6
DS2805A-00 November 2012