RT6272A/B
Typical Application Circuit
R
BOOT
RT6272A/B
(Optional)
3
6
2
VIN
V
BOOT
IN
C
0.1μF
BOOT
C
C
IN
IN
L
10μF x 2
0.1μF
SW
V
OUT
5
C
C
FF
OUT
Enable
EN
R
R
FB1
4
FB
GND
1
FB2
Table 1. Recommended Components Selection
RFB1
(k)
RFB2
(k)
VOUT (V)
CFF (pF)
L (H)
COUT (F)
5.0
3.3
2.5
1.8
1.5
1.2
1.0
54.9
33.2
22.6
13.7
9.53
5.76
3.09
10
10
10
10
10
10
10
10 to 100
10 to 100
10 to 100
10 to 100
--
2.2
2.2
2.2
1
44
44
22
22
22
22
22
1
--
1
--
1
Table 2. Recommended External Components
Component
Description
Vendor P/N
GRM21BR61E106MA73 (MURATA)
0805X106M250 (WALSIN)
CIN
10F, 25V, X5R, 0805
22F, 6.3V, X5R, GRM187R60J226ME15 (MURATA)
COUT
0603
0603X226M6R3 (WALSIN)
74404054010 (WE)
FDV0530S-H-1R0M (MURATA)
1H
L
74404054022 (WE)
FDV0530S-H-2R2M (MURATA)
2.2H
Note :
Considering effective capacitance de-rating which is related to biased voltage level and size, the
effective capacitance of COUT should meet 18F as 3.3V ≤ VOUT ≤ 5V and 12F as VOUT < 3.3V.
The effect of higher CFF value (>100pF) may not be obvious; Furthermore, it probably results in worse
load regulation, checking the load regulation is suggested if higher CFF is applied.
Copyright © 2020 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
10
DS6272A/B-00 January 2020
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
