RT6255A/B
Pin No.
Pin Name
Pin Function
TSOT-23-6 (FC) TSOT-23-8 (FC)
Switch node. LX is the switching node that supplies power to
the output and connect the output LC filter from LX to the
output load.
5
6
LX
Bootstrap supply for high-side gate driver. Connect a 0.1F
ceramic capacitor from LX to BOOT to power the high-side
switch.
6
--
--
7
8
8
BOOT
PGOOD
SS
Power good indicator. Open-drain output when the output
voltage is within 90% to 120% of regulation point.
Soft-Start control input. Connect a capacitor from SS to GND
to set the soft-start time. The capacitance CSS is suggested to
be in the range from 2.8nF to 220nF.
Functional Block Diagram
(RT6255AHGJ6F/RT6255BHGJ6F)
BOOT
VIN
VIN
P
VCC
Reg
V
CC
Minoff
P
VCC
VIBIAS
V
REF
UGATE
OC
UV
LX
Control
Driver
LGATE
GND
EN
LX
GND
V
CC
EN
Ripple
Gen.
VIN
On-Time
LX
+
+
-
LX
Comparator
FB
Copyright 2017 Richtek Technology Corporation. All rights reserved.
©
is a registered trademark of Richtek Technology Corporation.
DS6255A/B-02 March 2017
www.richtek.com
3
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