RT6215F
Typical Application Circuit
RT6215F
R3
20
V
5
3
IN
2
6
BOOT
VIN
4.5V to 24V
C
C
BOOT
IN
22µF
0.1µF
L
V
OUT
EN
SW
Enable
MODE
1.5µH
1.05V
C
FF
C
44µF
OUT
Option
R1
6.49k
1
4
MODE
GND
R
FF
Option
8
FB
R2
20k
Table 1. Suggested Component Values
VOUT (V)
R1 (k)
R2(k)
20
L (H)
1.5
COUT (F)
CFF (pF)
RFF (k)
1.05
1.2
1.8
2.5
3.3
5
6.49
10.5
25.5
43.2
63.4
107
44
44
44
44
44
44
--
--
--
--
20
1.8
--
20
2.2
--
20
2.8
22 to 68
22 to 68
22 to 68
20, when CFF 47pF
20, when CFF 47pF
20, when CFF 47pF
20
3.6
20
4.7
Note :
(1)All the input and output capacitors are the suggested values, referring to the effective capacitances, subject to any de-
rating effect, like a DC bias.
(2) For lower output voltage applications, load transient responses can also be improved by adding a feedforward
capacitor (CFF, 22pF to 68pF).
Copyright 2018 Richtek Technology Corporation. All rights reserved.
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is a registered trademark of Richtek Technology Corporation.
www.richtek.com
8
DS6215F-00 September 2018
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
