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PDF RT8172A Data sheet ( Hoja de datos )
| Número de pieza | RT8172A | |
| Descripción | Dual Single-Phase PWM Controller | |
| Fabricantes | Richtek | |
| Logotipo |  |
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®
RT8172A
Dual Single-Phase PWM Controller for CPU and GPU Core
Power Supply
General Description
The RT8172A is a dual single-phase PWM controller with
integrated MOSFET drivers, compliant with Intel IMVP7
Pulse Width Modulation Specification to support both
CPU core and GPU core power. This part adopts G-NAVPTM
(Green-Native AVP), which is Richtek's proprietary topology
derived from finite DC gain compensator in constant on-
time control mode. The G-NAVPTM makes this part an
easy setting PWM controller to meet all Intel AVP (Active
Voltage Positioning) mobile CPU/GPU requirements. The
RT8172A uses SVID interface to control an 8-bit DAC for
output voltage programming. The built-in high accuracy
DAC converts the received VID code into a voltage value
ranging from 0V to 1.52V with 5mV step voltage. The
system accuracy of the controller can reach 0.8%. The
RT8172A operates in continuous conduction mode or
diode emulation mode, according to the SVID command.
The maximum efficiency can reach up to 90% in different
operating modes according to different load conditions.
The droop function (load line) can be 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 set via the SVID
interface. The RT8172A supports both DCR and sense
resistor current sensing. The RT8172A provides
VR_READY and thermal throttling output signals for
IMVP7 CPU and GPU core. This part also features
complete fault protection functions including over-voltage,
under-voltage, negative-voltage, over-current and thermal
shutdown.
The RT8172A is available in the WQFN-40L 5x5 small
footprint package.
Features
Dual Single-Phase PWM Controller for CPU Core
and GPU Core Power
IMVP7 Compatible Power Management States
Serial VID Interface
G-NAVPTM Topology
AVP for CPU VR Only
0.5% DAC Accuracy
0.8% System Accuracy
Differential Remote Voltage Sensing
Built-in ADC for Platform Programming
SETINI/SETINIA for CPU/GPU Core VR Initial
Startup Voltage
TMPMAX to Set Platform Maximum Temperature
ICCMAX/ICCMAXA for CPU/GPU Core VR
Maximum Current
Power Good Indicator : VR_READY/VRA_READY for
CPU/GPU Core Power
Thermal Throttling Indicator : VRHOT
Diode Emulation Mode at Light Load Condition
Fast Line/Load Transient Response
Switching Frequency up to 1MHz per Phase
OVP, UVP, NVP, OTP, UVLO, OCP
RoHS Compliant and Halogen Free
Simplified Application Circuit
VR_READY
VRA_READY
VRHOT
VCLK
VDIO
ALERT
RT8172A
VR_READY
VRA_READY PHASE
VRHOT
VCLK
VDIO
PHASEA
ALERT
MOSFET
MOSFET
VCORE
VGPU
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS8172A-00 November 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
1 page  
VID7
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
VID6
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
VID5
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
VID4
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
VID3
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
VID2
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
VID1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
VID0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
H1
4
4
4
4
4
4
4
4
4
4
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
6
6
6
6
6
6
6
6
6
6
RT8172A
H0 DAC Voltage
6 0.595
7 0.600
8 0.605
9 0.610
A 0.615
B 0.620
C 0.625
D 0.630
E 0.635
F 0.640
0 0.645
1 0.650
2 0.655
3 0.660
4 0.665
5 0.670
6 0.675
7 0.680
8 0.685
9 0.690
A 0.695
B 0.700
C 0.705
D 0.710
E 0.715
F 0.720
0 0.725
1 0.730
2 0.735
3 0.740
4 0.745
5 0.750
6 0.755
7 0.760
8 0.765
9 0.770
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS8172A-00 November 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
5
5 Page 
RT8172A
Functional Pin Description
Pin No.
1
2
3
Pin Name
BOOT1
TONSET
ISEN1P
Pin Function
CPU VR Bootstrap Supply for High-Side Gate Driver. This pin powers the
high-side MOSFET drivers. Connect this pin to the PHASE1 pin with a bootstrap
capacitor.
Single-Phase CPU VR On-Time Setting Pin. Connect this pin to VIN with a
resistor to set ripple size in PWM mode.
Positive Current Sense Input of CPU VR.
4 ISEN1N Negative Current Sense Input of CPU VR.
5 COMP
CPU VR Compensation Node. This pin is the output of the error amplifier.
6 FB
CPU VR Feedback Voltage Input. This pin is the inverting input node of the error
amplifier.
7 RGND
Return Ground for CPU VR. This pin is the inverting input node for differential
remote voltage sensing.
8
GFXPS2
Set Pin for GPU VR Operation Mode. Logic-high on this pin will force the GPU VR
to enter DCM.
9 VCC
Controller Power Supply Input. Connect this pin to GND via a ceramic capacitor
larger than 1F.
10 SETINI
ADC Input for Single-Phase CPU VR VBOOT Voltage Setting.
11 SETINIA ADC Input for Single-Phase GPU VR VBOOT Voltage Setting.
12
TMPMAX
ADC Input for Single-Phase CPU VR Maximum Temperature Setting.
13 ICCMAX ADC Input for Single-Phase CPU VR Maximum Current Setting.
14
ICCMAXA
ADC Input for Single-Phase GPU VR Maximum Current Setting.
15 TSEN
Thermal Monitor Sense Input Pin for CPU VR.
16 OCSET
17 TSENA
Single-Phase CPU VR Over-Current Protection Threshold Setting.
Connect a resistive voltage divider from VCC to ground, and connect the joint of
the voltage divider to the OCSET pin. The voltage, VOCSET, at this pin sets the
ov er current threshold, ILIMIT, for CPU VR.
Thermal Monitor Sense Input for GPU VR.
Single-Phase GPU VR Over-Current Protection Threshold Setting.
18
OCSETA
Connect a resistive voltage divider from VCC to ground, and connect the joint of
the v oltage divider to the OCSETA pin. The voltage, VOCSETA, at this pin sets the
ov er-current threshold, ILIMIT, for GPU VR.
19 IBIAS
Internal Bias Current Setting. Connect a 53.6k resistor from this pin to GND to
set the internal bias current.
20 VRHOT
Thermal Monitor Output (Active-Low).
21 VR_READY CPU VR Voltage Ready Indicator. This pin has an open-drain output.
22 VRA_READY GPU VR Voltage Ready Indicator. This pin has an open-drain output.
23 ALERT
Alert Line of SVID Interface (active low). This pin has an open drain output.
24 VDIO
Data Transmission Line of SVID Interface.
25 VCLK
26 RGNDA
Clock Signal Line of SVID Interface.
Return Ground for Single-Phase GPU VR.
This pin is the inverting input node for differential remote voltage sensing.
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS8172A-00 November 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet RT8172A.PDF ] | |
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