RT6217A/B
Typical Application Circuit
RT6217A/B
R3
20
V
IN
2
6
5
3
BOOT
VIN
EN
4.5V to 24V
C
C1
22µF
BOOT
0.1µF
L
V
OUT
Enable
SW
1.5µH
1.05V
C2
22µF
C3
22µF
R1
6.49k
C
R
FF
PGOOD
Option
100k
1
7
V
PGOOD
SS
PGOOD
8
4
FB
R2
20k
GND
C
SS
3.9nF
Table 1. Suggested Component Values
R1 (k)
6.49
10.5
25.5
43.2
63.4
107
R2 (k)
20
L (H)
1.5
VOUT (V)
1.05
1.2
COUT (F)
CFF (pF)
--
44
44
44
44
44
44
20
2.2
--
1.8
20
2.2
--
2.5
20
3.3
22 to 68
22 to 68
22 to 68
3.3
20
4.7
5
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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8
DS6217A/B-01 October 2018
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
