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PDF RT8876A Data sheet ( Hoja de datos )
| Número de pieza | RT8876A | |
| Descripción | Dual Channel PWM Controller | |
| Fabricantes | Richtek | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de RT8876A (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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®
RT8876A
Dual Channel PWM Controller with 3/2/1 Phase for CORE VR
and Single Phase for AXG VR
General Description
The RT8876A is a VR12/IMVP7 compliant CPU power
controller which includes two channels : a 3/2/1 phase
with 3 integrated drivers synchronous Buck controller for
the CORE VR, and a single phase Buck controller for the
AXG VR. The RT8876A adopts G-NAVPTM (Green Native
Adaptive Voltage Positioning), which is Richtek's
proprietary topology derived from a finite DC gain
compensator with current mode control, making it an easy
setting PWM controller, meeting all Intel CPU
requirements of AVP. Based on the G-NAVPTM topology,
the RT8876A also features a quick response mechanism
for optimizing AVP performance during load transient. The
RT8876A supports mode transition function with various
operating states. A serial VID (SVID) interface is built in
the RT8876A to communicate with Intel VR12/IMVP7
compliant CPU. The RT8876A 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 RT8876A 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. The
RT8876A integrates a high accuracy ADC for platform
setting functions, such as no-load offset or over current
level.
Features
z VR12/IMVP7 Compatible Power Management
z 3/2/1 Phase for CORE VR and Single Phase for AXG
VR
z 3 Embedded MOSFET Drivers at the CORE VR
z G-NAVPTM Topology
z Serial VID Interface
z 0.5% DAC Accuracy
z Differential Remote Voltage Sensing
z Built-in ADC for Platform Programming
z Accurate Current Balance
z System Thermal Compensated AVP
z Diode Emulation Mode at Light Load Condition for
Single Phase
z Fast Transient Response
z 1.1VINITIAL / 0.0VINITIAL for both Rails at Startup
z Power Ready Indicator
z Thermal Throttling
z Current Monitor Output
z OVP, UVP, OCP, OTP, UVLO
z External No-load Offset Setting for both Rails
z DVID Enhancement
z 56-Lead WQFN Package
z RoHS Compliant and Halogen Free
Applications
z VR12/IMVP7 Intel Core Supply
z Notebook/ Desktop Computer/ Servers Multi-phase CPU
Core Supply
z AVP Step-Down Converter
Simplified Application Circuit
To CPU
RT8876A
VR_RDY PHASE1
VRHOT
VCLK
PHASE2
PHASE3
VDIO
ALERT
PWMA
MOSFET
MOSFET
MOSFET
RT9612
MOSFET
VCORE
VAXG
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS8876A-03 January 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
1 page  
Operation
PWM CMP
Generate a signal to trigger Ton pulse.
TON GEN
Generate the PWM1 to PWM4 sequentially according
to the phase control signal from the Loop control
protection logic.
Control and Protection Logic
Execute the command from CPU.
The control logic also generates the digital code of the
VID.
Control the power on sequence
Control the protection behavior.
Control the operational phase number.
Current Balance
Generate the signal to control Ton to achieve current
balance.
RT8876A
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 large enough.
DAC
Generate a analog signal according to the digital code
generated by Control Logic.
Soft-Start and Slew Rate Control
Control the Dynamic VID slew rate of VSET according to
the SetVID fast or SetVID slow.
3-PHASE Driver
Generate UGATE [1:3] and LGATE [1:3] signal by PWM
[1:3] signal.
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS8876A-03 January 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
5
5 Page 
RT8876A
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
0
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
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
VID3
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
0
0
0
0
0
VID2
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
0
0
0
0
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
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
0
1
0
1
0
Hex
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
F0
F1
F2
F3
F4
Voltage (V)
1.265
1.270
1.275
1.280
1.285
1.290
1.295
1.300
1.305
1.310
1.315
1.320
1.325
1.330
1.335
1.340
1.345
1.350
1.355
1.360
1.365
1.370
1.375
1.380
1.385
1.390
1.395
1.400
1.405
1.410
1.415
1.420
1.425
1.430
1.435
1.440
1.445
1.450
1.455
1.460
1.465
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS8876A-03 January 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet RT8876A.PDF ] | |
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