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RT8885AZQW

Dual Output 3-Phase + 2-Phase PWM Controller For CPU and GPU Core Power Supply

Richtek Technology 

®

RT8885A

Dual Output 3-Phase + 2-Phase PWM Controller For CPU

and GPU Core Power Supply

General Description

The RT8885A is a dual output 3-phase + 2-phase PWM

controller with 3 integrated MOSFET gate drivers and a

single SVID interface for CPU and GPU core power supply.

This part complies with Intel VR12/IMVP7 Pulse Width

Modulation Specification. The RT8885A adopts G-NAVPTM

(Green-Native AVP), which is a Richtek proprietary topology

derived from finite DC gain compensator in constant on-

time control mode. G-NAVPTM makes this part an easy-

setting PWM controller to meet all Intel mobile CPU/GPU

AVP (Active Voltage Positioning) requirements. The

RT8885A uses SVID interface to control an internal 8-bit

DAC for output voltage programming. The built-in high

accuracy DAC converts the VID code to a reference voltage

ranging from 0V to 1.52V with 5mV step voltage. The

system accuracy of the controller reaches 0.8%. Each

output channel of the RT8885A can operate in multi-phase

continuous conduction mode or in single-phase diode

emulation mode to reach a maximum of 90% efficiency in

different load conditions. The droop function (load line) is

selectable and the load line is easily programmed by setting

the DC gain of the error amplifier. With proper

compensation, the load transient response can achieve

optimized AVP performance. The output voltage transition

slew rate is programmed via the SVID interface. The

RT8885A supports inductor DCR and sense-resistor

current sensing. This device provides power good

indication, current monitor, thermal monitor and thermal

throttling output signals for IMVP7 CPU and GPU core.

This part also provides complete fault protection functions

including over voltage, under voltage, negative voltage, over

current, thermal shutdown and under voltage lockout.

Features

 Dual Output : 3-Phase (CORE) + 2-Phase (GFX)

 Integrated MOSFET Drivers : 2 (CORE) + 1 (GFX)

 VR12/IMVP7 PWM Specification Compliant

 Serial VID Interface

 G-NAVPTM Topology

 Fast Line/Load Transient Response

 Quick Response for Load Transient

 0.5% DAC Accuracy

 0.8% System Accuracy

 Accurate Current Balance

 Selectable Droop Function

 Selectable Forced DEM Operation

 Built-in ADC for Platform Programming

 Power Good Indicator

 Current Monitor Output

 Thermal Monitor

 Thermal Throttling Indicator VRHOT

 Phase Shedding in PS1

 Phase Shedding and Diode Emulation in PS2

 Differential Remote Output Voltage Sense

 Lossless Inductor DCR Current Sense

 Switching Frequency up to 1MHz per Phase

 OVP, UVP, NVP, OCP, OTP, UVLO

 56-Lead WQFN Package

 RoHS Compliant and Halogen Free

Applications

 IMVP7 Intel CPU/CPU Core Power Supply

 Laptop Computer

 AVP Step-Down Converter

Simplified Application Circuit

VGFX

Buck A1

Buck A2

From CPU

Driver Bus #A1

Driver Bus #1

PWMA2

RT8885A

Driver Bus #2

SVID Bus

PWM3

Buck 1

Buck 2

Buck 3

VCORE

Copyright ©2014 Richtek Technology Corporation. All rights reserved.

DS8885A-01 January 2014

is a registered trademark of Richtek Technology Corporation.

www.richtek.com

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