RT6218A/B
Ordering Information
RT6218A/B
R
Package Type
J8F : TSOT-23-8 (FC)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Reference Voltage
V
REF
= 0.765V
GND
Pin Configuration
(TOP VIEW)
BOOT
EN
FB
6
3
8
7
2
PWM Operation Mode
A : Automatic PSM
B : Forced PWM
TSOT-23-8 (FC)
Note :
Richtek products are :
RoHS compliant and compatible with the current
requirements of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering processes.
Functional Pin Description
Pin No.
1
2
3
4
Pin Name
GND
LX
VIN
PGOOD
Pin Function
Power ground. This pin, connected to analog ground, must be soldered to a
large PCB copper area for maximum power dissipation.
Switch node between the internal switch and the synchronous rectifier.
Connect this pin to the inductor and bootstrap capacitor.
Power input. The input voltage range is from 4.5V to 18V. Connect a suitable
input capacitor between this pin and GND, with a typical capacitance of 22F.
Open-drain power-good indication output. Once being started-up, PGOOD will
be pulled low to GND if any internal protection is triggered.
Soft-start capacitor connection node. Connect an external capacitor between
this pin and ground to set the soft-start time. Do not leave this pin
unconnected. A capacitor of 8.2nF is suggested.
Feedback voltage input. Connect this pin to the midpoint of the external
feedback resistive divider to set the output voltage of the converter to the
desired regulation level. The device regulates the FB voltage at Feedback
Threshold Voltage, typically 0.765V.
Enable control input. Floating this pin or connecting this pin to GND can disable
the device and connecting this pin to logic high can enable the device.
Bootstrap capacitor connection node to supply the high-side gate driver.
Connect a 0.1F ceramic capacitor between this pin and LX pin.
5
SS
6
FB
7
8
EN
BOOT
Copyright © 2018 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
2
DS6218A/B-01
PGOOD
VIN
UVP Option
H : Hiccup
LX
SS
5
4
October
2018
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
