
	Richtek Technology Electronic Components Datasheet

RT8171C Datasheet

Single-Phase Controller

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RT8171C

Single-Phase Controller with Integrated Driver for VR12.1

Mobile CPU Core Power Supply

General Description

The RT8171C is a VR12.1 compliant CPU power controller

which includes one voltage rails : a 1 phase synchronous

buck controller, the CORE VR. The RT8171C has zero

load-line function to support zero load-line application. The

RT8171C adopts G-NAVPTM (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-NAVPTM topology, the RT8171C also features a

quick response mechanism for optimized AVP performance

during load transient. The RT8171C supports mode

transition function with various operating states. A Serial

VID (SVID) interface is built in the RT8171C to

communicate with Intel VR12.1 compliant CPU. The

RT8171C supports VID on-the-fly function with three

different slew rates : Fast, Slow and Decay. By utilizing

the G-NAVPTM topology, the operating frequency of the

RT8171C 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

RT8171C integrates a high accuracy ADC for platform

setting functions, such as quick response or over current

level. The RT8171C 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 RT8171C 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-NAVPTM 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

3L= : Product Code

3L=YM

DNN

YMDNN : Date Code

Simplified Application Circuit

To PCH

To CPU

RT8171C

VR_READY

VR_HOT UGATE

VCLK

VDIO

ALERT

PHASE

LGATE

VIN

VCORE

DS8171C-02 September 2015

is a registered trademark of Richtek Technology Corporation.

www.richtek.com


	Richtek Technology Electronic Components Datasheet

RT8171C Datasheet

Single-Phase Controller

No Preview Available !

RT8171C

Ordering Information

RT8171C

Package Type

QW : WQFN-32L 4x4 (W-Type)

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.

Pin Configurations

(TOP VIEW)

VREF

COMP

VSEN

RGND

VCC

SET1

SET2

32 31 30 29 28 27 26 25

1 24

2 23

3 22

GND

6 33 19

7 18

8 17

9 10 11 12 13 14 15 16

DRV_EN

PHASE

BOOT

PVCC

LGATE

PGND

DRV_EN

VR_READY

WQFN-32L 4x4

Functional Pin Description

Pin No.

Pin Name

VREF

COMP

VSEN

RGND

VCC

SET1

SET2

SET3

IBIAS

TSEN

Pin Function

Fixed 0.6V Output Reference Voltage. This voltage is only used to offset the

output voltage of the IMON pin. Between this pin and GND must be placed a

exact 0.47F decoupling capacitor.

CORE VR Compensation Node. This pin is the output node of the error

amplifier.

CORE VR Feedback Voltage Input. This pin is the negative input node of the

error amplifier.

CORE VR Voltage Sense Input. This pin is connected to the terminal of CORE

VR output voltage.

Return Ground for CORE VR. This pin is the negative node of the differential

remote voltage sensing.

Supply Voltage Input. Connect this pin to GND via a ceramic capacitor larger

than 2.2F. The decoupling capacitor should be placed as close to the

controller as possible. If the ripple of voltage source is large, RC low pass filter

is recommended. (R = 20, C = 2.2F)

1st Platform Setting. Platform can use this to set DVID compensation time,

RSET, DVID compensation width and OCS.

2nd Platform Setting. Platform can use this to set ICCMAX, QRTH and

QRWIDTH.

3rd Platform Setting. Platform can use this to set zero load-line, anti-overshoot,

ADDR, switching frequency range, shrink TON at PS2 and PS3 and ZCD

threshold voltage.

Internal Bias Current Setting. Connecting this pin to GND by a 100k resistor

can set the internal current. Do not connect this pin to GND by a bypass

capacitor.

Thermal Sense Input of CORE VR.

www.richtek.com

is a registered trademark of Richtek Technology Corporation.

DS8171C-02 September 2015

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RT8171C Datasheet

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