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PDF RT8884C Data sheet ( Hoja de datos )
| Número de pieza | RT8884C | |
| Descripción | Multi-Phase PWM Controller | |
| Fabricantes | Richtek | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de RT8884C (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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®
RT8884C
Multi-Phase PWM Controller for CPU Core Power Supply
General Description
The RT8884C is a 4/3/2/1 multi-phase synchronous Buck
controller designed to meet Intel VR12.5 compatible CPU
specification with a serial VID control interface. The
RT8884C adopts G-NAVPTM (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-
NAVPTM topology, the RT8884C also features a quick
response mechanism for optimized AVP performance
during load transient. The RT8884C supports mode
transition function with various operating states. A Serial
VID (SVID) interface is built in the RT8884C to
communicate with Intel VR12.5 compliant CPU. The
RT8884C 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
RT8884C varies with VID, load current and input voltage
to further enhance the efficiency even in CCM. Besides
G-NAVPTM, the CCRCOT (Constant Current Ripple
Constant On Time) technology provides superior output
voltage ripple over the entire input/output range.
Features
Intel VR12.5 Serial VID Interface Compatible
4/3/2/1 Phase PWM Controller
G-NAVPTM 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 Operation
Fast Transient Response
VR Ready Indicator
Thermal Throttling
Current Monitor Output
OVP, UVP, OCP, NVP, UVLO
External No-Load Offset Setting
DVID Enhancement
Small 32-Lead WQFN Package
RoHS Compliant and Halogen Free
Applications
VR12.5 Intel Core Power Supply
Notebook/Desktop Computer/Servers Multi-phase CPU
Core Power Supply
AVP Step-Down Converter
Simplified Application Circuit
To PCH
To CPU
RT8884C
VR_RDY PWM1
VR_HOT
VCLK
VDIO
ALERT
PWM2
PWM3
PWM4
RT9624A
RT9624A
RT9624A
RT9624A
VCORE
Copyright ©2015 Richtek Technology Corporation. All rights reserved.
DS8884C-00 July 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
1 page  
Operation
The RT8884C adopts G-NAVPTM (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).
The RT8884C adopts the G-NAVPTM controller, which is
one type of current mode constant on-time control with
DC offset cancellation. The approach can not only improve
DC offset problem for increasing system accuracy but also
provide fast transient response. For the RT8884C, when
current feedback signal reaches COMP signal to generate
an on-time width to achieve PWM modulation.
TON GEN
Generate the PWM1 to PWM4 sequentially according to
the phase control signal from the Loop Control Protection
Logic.
SVID Interface/Configuration Registers/Control
Logic
The interface that receives the SVID signal from CPU and
sends the relative signals to Loop Control Protection Logic
to execute the action by CPU.
The registers save the pin setting data from ADC output.
The Control Logic controls the ADC timing and generates
the digital code of the VID that is relative to VSEN.
RT8884C
Loop Control Protection Logic
It controls the power on sequence, the protection behavior,
and the operational phase number.
Current Balance
Each phase current sense signal is sent to the current
balance circuit which adjusts the on-time of each phase
to optimize current sharing.
Offset Cancellation
Cancel the current/voltage ripple issue to get the accurate
VSEN.
UVLO
Detect the DVD and VCC voltage and issue POR signal as
they are high enough.
DAC
Generate an analog signal according to the digital code
generated by Control Logic.
Soft-Start & Slew Rate Control
Control the Dynamic VID slew rate of VSET according to
the SetVID fast or SetVID slow.
Copyright ©2015 Richtek Technology Corporation. All rights reserved.
DS8884C-00 July 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
5
5 Page 
VID7
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
1
1
1
1
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
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
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
VID4
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
0
0
0
0
0
0
VID3
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
1
1
1
1
1
1
Copyright ©2015 Richtek Technology Corporation. All rights reserved.
DS8884C-00 July 2015
RT8884C
VID2
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
0
0
1
1
1
1
VID1
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
1
1
0
0
1
1
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
0
1
0
1
HEX
C8
C9
CA
CB
CC
CD
CE
CF
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
DA
DB
DC
DD
DE
DF
E0
E1
E2
E3
E4
E5
E6
E7
E8
E9
EA
EB
EC
ED
EE
EF
Voltage (V)
2.490
2.500
2.510
2.520
2.530
2.540
2.550
2.560
2.570
2.580
2.590
2.600
2.610
2.620
2.630
2.640
2.650
2.660
2.670
2.680
2.690
2.700
2.710
2.720
2.730
2.740
2.750
2.760
2.770
2.780
2.790
2.800
2.810
2.820
2.830
2.840
2.850
2.860
2.870
2.880
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet RT8884C.PDF ] | |
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