RT6255A/B
Typical Application Circuit
RT6255A/B
V
IN
BOOT
VIN
EN
C
4.5V to 18V
BOOT
C1
22µF
0.1µF
L
V
OUT
Enable
LX
1V
1.5µH
C2
22µF
C3
22µF
C
FF
R1
13.3k
R
PGOOD
100k
R
T
Option
5k
V
PGOOD*
AGND
FB
PGOOD
R2
20k
GND
* : PGOOD pin is for (RT6255AHGJ8F/RT6255BHGJ8F)
RT6255A/B
V
IN
BOOT
VIN
EN
C
4.5V to 18V
BOOT
C1
22µF
0.1µF
L
V
OUT
Enable
LX
1V
1µH
C2
22µF
C3
22µF
C
FF
R1
13.3k
R
Option
T
5k
SS*
C
3.9nF
SS
FB
R2
20k
AGND
GND
* : SS pin is for (RT6255AHSGJ8F/RT6255BHSGJ8F)
Table 1. Suggested Component Values
R1 (k)
13.3
20
R2 (k)
20
L (H)
1.5
1.5
2
VOUT (V)
COUT (F)
CFF (pF)
--
1
44
44
44
44
44
44
1.2
1.8
2.5
3.3
5
20
--
40.2
63.4
90.9
147
20
--
20
2.8
3.3
4.7
47 to 82
47 to 82
47 to 82
20
20
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.
Note 2 : Considering the noise immunity, it is necessary to add RT = 4.99k between feedback network and chip FB pin.
Copyright 2017 Richtek Technology Corporation. All rights reserved.
©
is a registered trademark of Richtek Technology Corporation.
DS6255A/B-02 March 2017
www.richtek.com
9
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