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PDF RT8888D Data sheet ( Hoja de datos )
| Número de pieza | RT8888D | |
| Descripción | 3-Phase Controller | |
| Fabricantes | Richtek | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de RT8888D (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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®
RT8888D
3-Phase Controller with Triple Integrated Driver for VR12.5
Mobile CPU Core Power Supply
General Description
The RT8888D is a three phase CPU power controller with
triple integrated driver for VR12.5 compliant. The RT8888D
adopts the 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 an
easy setting the droop to meet all Intel CPU requirements
of AVP (Adaptive Voltage Positioning). Based on the G-
NAVPTM topology, the RT8888D also features a quick
response mechanism for optimized AVP performance
during load transient. The RT8888D supports mode
transition function with various operating states. A Serial
VID (SVID) interface is built in the RT8888D to
communicate with Intel VR12.5 compliant CPU. The
RT8888D 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
RT8888D varies with VID, load current and input voltage
to further enhance the efficiency even in CCM. Besides
the G-NAVPTM, the CCRCOT (Constant Current Ripple
Constant On Time) technology provides superior output
voltage ripple over the entire input/output range. The built-
in high accuracy DAC converts the SVID code ranging
from 0.5V to 3.04V with 10mV per step. The RT8888D
integrates a high accuracy ADC for platform setting
functions, such as no-load offset and over current
protection level. The RT8888D 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 RT8888D is available in the WQFN-40L 5x5
small foot print package.
Features
Intel VR12.5 Serial VID Interface Compatible
3/2/1 Phase PWM Controller with Triple Integrated
Driver
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
Fast transient Response
VR Ready Indicator
Thermal Throttling
Current Monitor Output
OVP, UVP, OCP, UVLO
External No-Load Offset Setting
DVID Enhancement
Small 40-Lead WQFN Package
RoHS Compliant and Halogen Free
Applications
VR12.5 Intel Core Supply
Notebook/Desktop Computer/Servers Multi-phase CPU
Core Supply
AVP Step-Down Converter
Simplified Application Circuit
To PCH
To CPU
RT8888D
VR_RDY PHASE1
VR_HOT
VCLK
PHASE2
VDIO
ALERT PHASE3
Copyright ©2015 Richtek Technology Corporation. All rights reserved.
DS8888D-00 August 2015
MOSFET
MOSFET
MOSFET
VCORE
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
1 page  
Operation
The RT8888D adopts the 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 G-NAVPTM controller 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 RT8888D, when current feedback signal
reaches COMP signal to generate an on-time width to
achieve PWM modulation.
TON GEN
Generate the PWM1 to PWM3 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.
RT8888D
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 balancing
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 PVCC 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.
DS8888D-00 August 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
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
1
VID5
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
1
1
1
1
1
1
VID4
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
1
1
1
1
1
1
VID3
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
0
0
0
0
0
0
Copyright ©2015 Richtek Technology Corporation. All rights reserved.
DS8888D-00 August 2015
RT8888D
VID2
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
0
0
0
0
1
1
VID1
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
0
0
VID0
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
0
1
HEX
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
F0
F1
F2
F3
F4
F5
Voltage (V)
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
2.890
2.900
2.910
2.920
2.930
2.940
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet RT8888D.PDF ] | |
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