®
RT2701
Dual-Phase PWM Controller for GPU Core Power Supply
General Description
The RT2701 is a dual-phase synchronous Buck PWM
controller with integrated drivers which are optimized for
high performance graphic microprocessor and computer
applications. The IC integrates a PWM controller, two 12V
MOSFET drivers with internal bootstrap diodes, as well
as output current monitoring and protection functions into
the WQFN-24L 4x4 package. The RT2701 adopts DCR
and R
DS(ON)
current sensing. Over current protection is
accomplished through continuous inductor DCR current
sensing, while R
DS(ON)
current sensing is used for accurate
channel current balance. Using both methods of current
sampling utilizes the best advantages of each technique.
The RT2701 also features an one-bit VID control operation
in which the feedback voltage is regulated and tracks
external input reference voltage. Other features include
adjustable operating frequency, external compensation and
enable/shutdown functions.
Features
Dual-Phase PWM Controller
Two Embedded MOSFET Drivers and Embedded
Switching Boot Diode
Dynamic Auto Phase Control with Adjustable
Threshold
Cross-talk Jitter Suspend (CJS
TM
)
Remote GND Detection for High Accuracy
Automatic Diode Emulation Mode/Or Ultrasonic
Mode at Light Load
Lossless R
DS(ON)
Current Sensing for Current Balance
Lossless DCR Current Sensing for AVP & OCP
Reference Voltage Output with 1% Accuracy
External Reference Input with Soft-Start (RISS)
Embedded One-Bit VID Control
Adjustable OCP Threshold
Adjustable Switching Frequency
Reference Tracking UVP/OVP Protection
Shoot Through Protection and Short Pulse Free
Technology
RoHS Compliant and Halogen Free
Ordering Information
RT2701
Package Type
QW : WQFN-24L 4x4 (W-Type)
(Exposed Pad-Option 1)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Note :
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.
Applications
Middle to High End GPU Core Power
High End Desktop PC Memory Core Power
Low Voltage, High Current DC/DC Converter
Voltage Regulator Modules
Simplified Application Circuit
RT2701
V
IN
VCC
PHASE1
PHASE2
PGND
MOSFET
MOSFET
L1
V
VDD
L2
GPIO
VID
OCP
PS
RMPSET
Copyright
©
2013 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS2701-00 May 2013
www.richtek.com
1
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
