RT6255A/B
Functional Pin Description
Pin No.
Pin Name
Pin Function
TSOT-23-6 (FC) TSOT-23-8 (FC)
Feedback voltage input. This pin is used to set the desired
output voltage via an external resistive divider.
1
1
3
FB
--
AGND
Analog ground. This is the signal ground reference for the IC.
Enable control input. Connecting this pin to logic high can
enable the device and connecting this pin to GND can disable
the device.
2
2
EN
3
4
4
5
GND
VIN
System ground. This is the power return for the IC.
Power input. Supplies the power switches of the device.
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.
Copyright 2018 Richtek Technology Corporation. All rights reserved.
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is a registered trademark of Richtek Technology Corporation.
DS6255A/B-03 October 2018
www.richtek.com
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