RT5789A/B
Functional Pin Description
Pin No.
TSOT-23-8
(FC)
1
UDFN-8L
2.5x2 (FC)
8
Pin Name
Pin Function
Open-drain power-good indication output. The power-good function is
activated after soft-start is finished.
Power input. The input voltage range is from 2.5V to 6V. Connect a
suitable input bypass capacitor (typically of greater than 10F) between
this pin and PGND. The bypass capacitor should be placed as close to
the IC as possible.
Switch node between the internal switch and the synchronous rectifier.
Connect the output LC filter from this pin to the output load.
Power ground. This pin, connected to analog ground, must be soldered
to a large PCB copper area for maximum power dissipation.
Output voltage sense input. This pin is used to monitor and adjust output
voltage to enhance load transient regulation.
Analog ground. It provides a ground return path for the control circuitry
and internal reference. Connect AGND to a clean inner GND point with
separate trace.
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 a
feedback reference voltage, typically 0.6V.
Enable control input. A logic-high enables the converter; a logic-low
forces the device into shutdown mode.
PGOOD
2
7
VIN
3
4
5
6
5
4
LX
PGND
VOUT
6
3
AGND
7
2
FB
8
1
EN
Copyright
©
2018 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS5789A/B-02 March 2018
www.richtek.com
3
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
