RT6365
Functional Pin Description
Pin No.
Pin Name
BOOT
VIN
Pin Function
SOP-8
WDFN-10L 4x4
(Exposed Pad)
Bootstrap capacitor connection node to supply the high-side
gate driver. Connect a 0.1F ceramic capacitor between this
pin and the SW pin.
1
2
3
1
2
3
Power input. The input voltage range is from 4V to 60V.
Connect a suitable input capacitor between this pin and GND,
usually four 2.2F or larger ceramic capacitors with two
typical capacitance 4.7F.
Enable control pin with internal pull-up current source. Float
or provide a logic-high ( 1.2V) enables the converter; a
logic-low forces the device into shutdown mode.
EN
Soft-start and tracking control input. Connect a capacitor from
SS to GND to set the soft-start period. ”Do Not” leave this pin
floating to avoid inrush current during power up. It also can
be used to track and sequence because the SS/TR pin
voltage can override the internal reference voltage.
--
4
SS/TR
Frequency setting and external synchronous signal input.
Connect a resistor from this pin to GND to set the switching
frequency. Tie to a clock source for synchronization to an
external frequency.
4
5
5
6
RT/SYNC
FB
Output voltage sense. Sense the output voltage at the FB pin
through a resistive divider. The feedback reference voltage is
0.8V typically.
Compensation node. Connect external compensation
elements to this pin to stabilize the control loop.
6
7
7
8
COMP
GND
Ground. Provide the ground return path for the control
circuitry.
Switch node. SW is the switching node that supplies power
to the output. Connect the output LC filter from SW to the
output load.
8
9
SW
Open-drain power-good indication output. Once being
started-up, PGOOD will be pulled low to GND if any internal
protection is triggered.
--
10
PGOOD
Exposed pad. The exposed pad is internally unconnected
and must be soldered to a large PCB copper area for
maximum power dissipation.
9 (Exposed Pad)
11 (Exposed Pad) PAD
Copyright 2019 Richtek Technology Corporation. All rights reserved.
©
is a registered trademark of Richtek Technology Corporation.
DS6365-01 October 2019
www.richtek.com
3
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