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PDF RT8880C Data sheet ( Hoja de datos )
| Número de pieza | RT8880C | |
| Descripción | Dual-Output PWM Controller | |
| Fabricantes | Richtek | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de RT8880C (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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®
RT8880C
Dual-Output PWM Controller with 3 Integrated Drivers for
AMD SVI2 Mobile CPU Power Supply
General Description
The RT8880C is a 3 + 2 phases PWM controller, and is
compliant with AMD SVI2 Voltage Regulator Specification
to support both CPU core (VDD) and Northbridge portion
of the CPU (VDDNB). The RT8880C features CCRCOT
(Constant Current Ripple Constant On-Time) with G-NAVP
(Green-Native AVP), which is Richtek's proprietary
topology. The G-NAVP makes it an easy setting controller
to meet all AMDAVP (Adaptive Voltage Positioning) VDD/
VDDNB requirements. The droop is easily programmed
by setting the DC gain of the error amplifier. With proper
compensation, the load transient response can achieve
optimized AVP performance. The controller also uses the
interface to issue VOTF Complete and to send digitally
encoded voltage and current values for the VDD and
VDDNB domains. It can operate in single phase and diode
emulation mode and reach up to 90% efficiency in different
modes according to different loading conditions. The
RT8880C provides special purpose offset capabilities by
pin setting. The RT8880C also provides power good
indication, over-current indication (OCP_L) and dual OCP
mechanism for AMD SVI2 CPU core and NB. It also
features complete fault protection functions including over-
voltage, under-voltage and negative-voltage protections.
Features
3/2/1-Phase (VDD) + 2/1/0-Phase (VDDNB) PWM
Controller
3 Embedded MOSFET Drivers
G-NAVPTM Topology
Support Dynamic Load-Line and Zero Load-Line
Diode Emulation Mode at Light Load Condition
SVI2 Interface to Comply with AMD Power
Management Protocol
Build-in ADC for VOUT and IOUT Reporting
Immediate OV, UV and NV Protections and UVLO
Programmable Dual OCP Mechanism
0.5% DAC Accuracy
Fast Transient Response
Power Good Indicator
Over-Current Indicator
RoHS Compliant and Halogen Free
Applications
AMD SVI2 Mobile CPU
Laptop Computer
Simplified Application Circuit
To CPU
RT8880C
OCP_L PHASE1
SVC
SVD
PHASE2
PWM3
PHASEA1
SVT PWMA2
MOSFET
MOSFET
RT9610
MOSFET
RT9610
MOSFET
MOSFET
VVDD
VVDDNB
Copyright ©2015 Richtek Technology Corporation. All rights reserved.
DS8880C-02 January 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
1 page  
Function Block Diagram
RT8880C
IBIAS
FBA
COMPA
ISENA1P
ISENA1N
ISENA2P
ISENA2N
IMONA
RGND
FB
COMP
ISEN1P
ISEN1N
ISEN2P
ISEN2N
ISEN3P
ISEN3N
MUX
UVLO
ADC
From Control Logic
SVI2 Interface
Configuration Registers
Control Logic
OFS/OFSA
Load Line
/Load Line A
RSET/RSETA
Loop Control
Protection Logic
RGND
DAC
Soft-Start & Slew
Rate Control
ERROR
VSETA AMP
+
-
Offset
Cancellation
Current mirror
OCP Threshold
+
+ - PWM
CMPA
QRA
TONA
TON
GENA PWMA1
1-PH
Driver
+x2
-
IBA1
+
0.4
V064 -
Current mirror
RSETA
Current
Balance
+x2
-
From Control Logic
IBA2
Average
IMONAI
OCP_TDCA,
OCP_SPIKEA
+ OCA To Protection Logic
-
IBA1 IBA2
Driver
POR
DAC
VSENA OV/UV/NV
Soft-Start & Slew Rate
Control
ERROR
VSET AMP
+
-
Offset
Cancellation
Current mirror
+x1 IB1
-
Current mirror
+
0.4
-
+
RSET
+
-
PWM
CMP
QR
TON
PWM1
TON PWM2
GEN
2-PH
Driver
+x1 IB2
-
Average
IMONI
Current Balance
Current mirror
+x1 IB3
-
IB1 IB2 IB3
+
OCP_TDC,
OCP_SPIKE -
OC To Protection Logic
VSEN OV/UV/NV
GND
TONSETA
PWMA2
BOOTA1
UGATEA1
PHASEA1
LGATEA1
PVCC
TONSET
BOOTx
UGATEx
PHASEx
LGATEx
PWM3
IMON V064
Copyright ©2015 Richtek Technology Corporation. All rights reserved.
DS8880C-02 January 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
5
5 Page 
RT8880C
Table 4. SET2 Pin Setting for VDD Controller QR Threshold, DVID Compensation,
NB 0LL and OCP Trigger Delay
SET2 Pin Voltage
Before Current Injection VSET2 (mV)
19
72
122
172
222
272
323
373
423
473
523
573
623
673
723
773
823
874
924
974
1024
1074
1124
1174
1224
1274
1324
1375
1425
1475
1525
1575
QRTH
(for VDD)
Disable
39mV
47mV
55mV
Disable
39mV
47mV
55mV
DVID
Compensation [0]
0
0
0
0
1
1
1
1
NB OLL
Setting
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
OCPTRGDELAY
(for VDD/VDDNB)
10ms
40ms
10ms
40ms
10ms
40ms
10ms
40ms
10ms
40ms
10ms
40ms
10ms
40ms
10ms
40ms
10ms
40ms
10ms
40ms
10ms
40ms
10ms
40ms
10ms
40ms
10ms
40ms
10ms
40ms
10ms
40ms
Copyright ©2015 Richtek Technology Corporation. All rights reserved.
DS8880C-02 January 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet RT8880C.PDF ] | |
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