RT6214A/B
Functional Pin Description
Pin No.
Pin Name
Pin Function
TSOT-23-6
(FC)
TSOT-23-8
(FC)
Power ground. This pin, connected to analog ground, must be
soldered to a large PCB copper area for maximum power dissipation.
1
2
1
2
GND
LX
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.
3
--
--
3
4
5
VIN
Open-drain power-good indication output. Once being started-up,
PGOOD will be pulled low to GND if any internal protection is
triggered.
PGOOD
SS
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/0.8V.
4
6
FB
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.
5
6
7
8
EN
Bootstrap capacitor connection node to supply the high-side gate
driver. Connect a 0.1F ceramic capacitor between this pin and LX
BOOT
pin.
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is a registered trademark of Richtek Technology Corporation.
DS6214A/B-09 August 2018
www.richtek.com
3
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