RT3663BM
Pin No.
28
29
30
31
32
33, 36
34, 35
37
38
39
40
41
46, 2, 42
Pin Name
VCC
IBIAS
COMPA
FBA
VSENA
ISENA2P,
ISENA1P
ISENA2N,
ISENA1N
EN
PGOODA
PGOOD
TONSETA
PWMA2
BOOT1,
BOOT2,
BOOTA1
UGATE1,
UGATE2,
UGATEA1
PHASE1,
PHASE2,
PHASEA1
LGATE1,
LGATE2,
LGATEA1
PVCC
GND
Pin Function
Controller power supply input. Connect this pin to 5V with an 1F or greater
ceramic capacitor for decoupling.
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.
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.
Positive current sense input of Channel 1 and 2 for VDDNB controller.
Negative current sense input of Channel 1 and 2 for VDDNB controller.
Controller enable control input. A logic high signal enables the controller.
Power good indicator for the VDDNB controller. This pin is an open-drain
output.
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
voltage, VIN, through a resistor, RTONNB, to set the on-time of
UGATE_VDDNB and also the output voltage ripple of VDDNB controller.
PWM output for Channel 2 of VDDNB controller.
Bootstrap supply for high-side MOSFET. This pin powers high-side MOSFET
driver.
47, 1, 43
High-side gate driver outputs. Connect this pin to Gate of high-side MOSFET.
48, 52, 44
Switch nodes of high-side driver. Connect this pin to high-side MOSFET
Source together with the low-side MOSFET Drain and the inductor.
49, 51, 45
50
53 (Exposed Pad)
Low-side gate driver outputs. This pin drives the Gate of low-side MOSFET.
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.
Copyright
©
2019 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
4
DS3663BM-00
September 2019
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
