RT8886A Datasheet, PDF (1/45 Pages) Richtek Technology Corporation – 2-Phase Controller with Dual Integrated Drivers

®
RT8886A
2-Phase Controller with Dual Integrated Drivers for VR12.5
and VR12.6 Mobile CPU Core Power Supply
General Description
The RT8886A is a two phase CPU power controller with
dual integrated drivers for VR12.5 and VR12.6 compliant.
The RT8886A adopts the G-NAVP^TM (Green Native AVP)
which is Richtek's proprietary topology derived from finite
DC gain of EA amplifier with current mode control, making
it easy to set the droop to meet all Intel CPU requirements
of AVP (Adaptive Voltage Positioning). Based on the G-
NAVP^TM topology, the RT8886A also features a quick
response mechanism for optimized AVP performance
during load transient. The RT8886A supports mode
transition function with various operating states. A Serial
VID (SVID) interface is built in the RT8886A to
communicate with Intel VR12.5 and VR12.6 compliant
CPU. The RT8886A supports VID on-the-fly function with
different slew rates. By utilizing the G-NAVP^TM topology,
the operating frequency of the RT8886A varies with VID,
load current and input voltage to further enhance the
efficiency even in CCM. Besides the G-NAVP^TM, the
CCRCOT (Constant Current Ripple Constant On Time)
technology provides superior output voltage ripple over
the entire input/output range. The built-in high accuracy
DAC converts the SVID code ranging from 0.5V to 3.04V
with 10mV per step. The RT8886A integrates a high
accuracy ADC for platform setting functions, such as no-
load offset and over-current protection level. The RT8886A
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 RT8886A
is available in the WQFN-32L 4x4 small foot print package.
Features
 Intel VR12.5 and VR12.6 Serial VID Interface
Compatible Power Management States
 2/1 Phase PWM Controller with Dual Integrated
Drivers
 G-NAVP^TM Topology
 0.5% DAC Accuracy
 Differential Remote Voltage Sensing
 Built-in ADC for Platform Programming
 Accurate Current Balance
 System Thermal Compensated AVP
 Diode Emulation Mode at Light Load Condition for
Single Phase
 Fast transient Response
 VR Ready Indicator
 Thermal Throttling
 Current Monitor Output
 OVP, UVP, OCP, UVLO
 Programmable DVID Slew Rate
 DVID Enhancement
 Small 32-Lead WQFN Package
 RoHS Compliant and Halogen Free
Simplified Application Circuit
To PCH
To CPU
RT8886A
VR_RDY
PHASE1
VR_HOT
VCLK
VDIO
PHASE2
ALERT
MOSFET
MOSFET
V_CORE
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS8886A-00 November 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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