RT3663BC
Pin No.
Pin Name
Pin Function
Controller power supply input. Connect this pin to 5V with an 1F or greater
ceramic capacitor for decoupling.
28
VCC
Internal bias current setting. Connect only a 100k resistor from this pin to
GND to generate bias current for internal circuit. Place this resistor as close to
the IBIAS pin as possible.
29
IBIAS
30
31
COMPA
FBA
Compensation node of the VDDNB controller.
Output voltage feedback input of VDDNB controller. This pin is the negative
input of the error amplifier for the VDDNB controller.
VDDNB controller voltage sense input. This pin is connected to the terminal of
VDDNB controller output voltage.
32
VSENA
ISENA2P,
ISENA1P
33, 36
Positive current sense input of Channel 1 and 2 for VDDNB controller.
ISENA2N,
ISENA1N
34, 35
37
Negative current sense input of Channel 1 and 2 for VDDNB controller.
Controller enable control input. A logic high signal enables the controller.
EN
Power good indicator for the VDDNB controller. This pin is an open-drain
output.
38
PGOODA
PGOOD
39
Power good indicator for the VDD controller. This pin is an open-drain output.
VDDNB controller on-time setting. Connect this pin to the converter input
40
41
TONSETA voltage, VIN, through a resistor, RTONNB, to set the on-time of
UGATE_VDDNB and also the output voltage ripple of VDDNB controller.
PWMA2
PWM output for Channel 2 of VDDNB controller.
BOOT1,
BOOT2,
BOOTA1
Bootstrap supply for high-side MOSFET. This pin powers high-side MOSFET
driver.
46, 2, 42
UGATE1,
UGATE2,
UGATEA1
47, 1, 43
High-side gate driver outputs. Connect this pin to Gate of high-side MOSFET.
PHASE1,
PHASE2,
PHASEA1
Switch nodes of high-side driver. Connect this pin to high-side MOSFET
Source together with the low-side MOSFET Drain and the inductor.
48, 52, 44
LGATE1,
LGATE2,
LGATEA1
49, 51, 45
50
Low-side gate driver outputs. This pin drives the Gate of low-side MOSFET.
PVCC
Driver power. Connect this pin to GND by ceramic capacitor larger than 1F.
Ground. The exposed pad must be soldered to a large PCB and connected to
GND for maximum power dissipation.
53 (Exposed Pad) GND
Copyright 2019 Richtek Technology Corporation. All rights reserved.
©
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
4
DS3663BC-03 August 2019
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
