RT8175A Datasheet, PDF (1/47 Pages) Richtek Technology Corporation – Single-Phase Controller with Integrated Driver

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RT8175A
Single-Phase Controller with Integrated Driver for VR12.1
Mobile CPU Core Power Supply
General Description
The RT8175A is a VR12.1 compliant CPU power controller
which includes one voltage rails : a 1 phase synchronous
buck controller, the CORE VR. The RT8175A has zero
load-line function to support zero load-line application. The
RT8175A adopts G-NAVP^TM (Green Native AVP), which is
Richtek's proprietary topology derived from finite DC gain
compensator with current mode control, making it an easy
to set the PWM controller, meeting all Intel CPU
requirements of AVP (Active Voltage Positioning). Based
on the G-NAVP^TM topology, the RT8175A also features a
quick response mechanism for optimized AVP performance
during load transient. The RT8175A supports mode
transition function with various operating states. A Serial
VID (SVID) interface is built in the RT8175A to
communicate with Intel VR12.1 compliant CPU. The
RT8175A supports VID on-the-fly function with three
different slew rates : Fast, Slow and Decay. By utilizing
the G-NAVP^TM topology, the operating frequency of the
RT8175A varies with VID, load and input voltage to further
enhance the efficiency even in CCM. The built-in high
accuracy DAC converts the SVID code ranging from 0.25V
to 1.52V with 5mV per step, as shown in Table 1. The
RT8175A integrates a high accuracy ADC for platform
setting functions, such as quick response or over current
level. The RT8175A provides VR ready output signals. It
also features complete fault protection functions including
Over Voltage (OV), Under Voltage (UV), Negative Voltage
(NV), Over Current (OC) and Under Voltage Lockout
(UVLO). The RT8175A is available in a WQFN-32L 4x4
small foot print package.
Features
 VR12.1 Compatible Power Management States
 Switching Frequency up to 1MHz
 Serial VID Interface
 Signal Phase PWM Controller
 G-NAVP^TM Topology
 0.5% DAC Accuracy
 Differential Remote Voltage Sensing
 Built-in ADC for Platform Programming
 System Thermal Compensated AVP
 Diode Emulation Mode at Light Load Condition
 Fast transient Response
 VR Ready Indicator
 Thermal Throttling
 Current Monitor Output
 Low Quiescent Power at PS3 and PS4
 OVP, UVP, OCP, UVLO, NVP
 Address Flip Function
 DVID Improvement
Applications
 VR12.1 Intel Core Supply
 Notebook CPU Core Supply
 AVP Step-Down Converter
Marking Information
3P= : Product Code
3P=YM
DNN
YMDNN : Date Code
Simplified Application Circuit
To PCH
To CPU
V_IN
RT8175A
VR_READY
VR_HOT UGATE
VCLK
VDIO
ALERT
PHASE
LGATE
V_CORE
Copyright ©2015 Richtek Technology Corporation. All rights reserved.
DS8175A-02 September 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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