DS8816A Datasheet, PDF (1/21 Pages) Richtek Technology Corporation – Dual-Phase PWM Controller with PWM-VID Reference

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RT8816A
Dual-Phase PWM Controller with PWM-VID Reference
General Description
The RT8816A is a 2/1 phase synchronous Buck PWM
controller which is optimized for high performance graphic
microprocessor and computer applications. The IC
integrates a Constant-On-Time (COT) PWM controller, two
MOSFET drivers with internal bootstrap diodes, as well
as channel current balance and protection functions
including Over-Voltage Protection (OVP), Under-Voltage
Protection (UVP), current limit, and thermal shutdown into
the WQFN-20L 3x3 package.
The RT8816A adopts R_DS(ON) current sensing technique.
Current limit is accomplished through continuous inductor-
current-sense, while R_DS(ON) current sensing is used for
accurate channel current balance. Using the method of
current sampling utilizes the best advantages of each
technique.
The RT8816A features external reference input and PWM-
VID dynamic output voltage control, in which the feedback
voltage is regulated and tracks external input reference
voltage. Other features include adjustable switching
frequency, dynamic phase number control, internal soft-
start, power good indicator, and enable functions.
Ordering Information
RT8816A
Package Type
QW : WQFN-20L 3x3 (W-Type)
Note :
Lead Plating System
G : Green (Halogen Free and Pb Free)
Richtek products are :
 RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
 Suitable for use in SnPb or Pb-free soldering processes.
Marking Information
7J= : Product Code
7J=YM
DNN
YMDNN : Date Code
Copyright ©2016 Richtek Technology Corporation. All rights reserved.
DS8816A-00 September 2016
Features
 Dual-Phase PWM Controller
 Power State Indicator
 1P-CCM/2P-CCM/1P-DEM/2P-DEM
 Two Embedded MOSFET Drivers and Embedded
Switching Boot Diode
 Support 1.8V PWM-VID Interface
 External Reference Input Control
 PWM-VID Dynamic Voltage Control
 Dynamic Phase Number Control
 Lossless R_DS(ON) Current Sensing for Current Balance
 Internal/External Soft-Start
 Adjustable Current Limit Threshold
 Adjustable Switching Frequency
 UVP/OVP Protection
 Shoot Through Protection and Short Pulse Free
Technology
 Support an Ultra-Low Output Voltage as Standby
Voltage
 Thermal Shutdown
 Power Good Indicator (EN to PG high = 500μs)
Applications
 CPU/GPU Core Power Supply
 Desktop PC Memory, VTT Power
 Chipset/RAM Power Supply
 Generic DC-DC Power Regulator
Pin Configuration
(TOP VIEW)
BOOT1
UGATE1
EN
PSI
VID
20 19 18 17 16
1
15 BOOT2
2
14 UGATE2
3
GND 13 PGOOD
4
21 12 OCSET/SS
5
11 VSNS
6 7 8 9 10
WQFN-20L 3x3
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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