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  Richtek Technology Electronic Components Datasheet  

RT8171C Datasheet

Single-Phase Controller

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RT8171C pdf
®
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
Copyright ©2015 Richtek Technology Corporation. All rights reserved.
DS8171C-02 September 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1


  Richtek Technology Electronic Components Datasheet  

RT8171C Datasheet

Single-Phase Controller

No Preview Available !

RT8171C pdf
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
FB
VSEN
RGND
VCC
SET1
SET2
32 31 30 29 28 27 26 25
1 24
2 23
3 22
4
5
GND
21
20
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.
1
2
3
4
5
6
7
8
9
10
11
Pin Name
VREF
COMP
FB
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 0.47F 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 2.2F. 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 = 2.2F)
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.
Copyright ©2015 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS8171C-02 September 2015


Part Number RT8171C
Description Single-Phase Controller
Maker Richtek
Total Page 30 Pages
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