RT8877F PWM Controller Datasheet

RT8877F Datasheet, PDF, Equivalent


Part Number

RT8877F

Description

Dual-Output PWM Controller

Manufacture

RichTek

Total Page 30 Pages
Datasheet
Download RT8877F Datasheet


RT8877F
®
RT8877F
Dual-Output PWM Controller for AMD SVI2 CPU Power
Supply
General Description
The RT8877F is a 4 + 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 RT8877F features CCRCOT
(Constant Current Ripple Constant On-Time) with the
G-NAVP (Green-Native AVP), which is Richtek's
proprietary topology. The G-NAVP makes it an easy setting
controller to meet all AMDAVP (Active 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 RT8877F provides special purpose offset capabilities
by pin setting. The RT8877F also provides power good
indication, over-current indication (OCP_L) and dual OCP
mechanism for AMD SVI2 CPU core and NB. It also
features fault protection functions, including over-voltage,
under voltage and negative voltage protections.
Features
4/3/2/1-Phase (VDD) + 2/1/0-Phase (VDDNB) PWM
Controller
G-NAVPTM Topology
Support Dynamic Load-Line and Zero Load-Line
Diode Emulation Mode at Light Load Condition
SVI2 Interface to Comply 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
52-Lead WQFN Package
RoHS Compliant and Halogen Free
Applications
AMD SVI2 CPU
Desktop Computer
Simplified Application Circuit
To CPU
RT8877F
OCP_L
PWM1
SVC
PWM2
PWM3
SVD
PWM4
PWMA1
SVT PWMA2
RT9624A
RT9624A
RT9624A
RT9624A
RT9624A
RT9624A
MOSFET
MOSFET
MOSFET
MOSFET
MOSFET
MOSFET
VVDD
VVDDNB
Copyright ©2018 Richtek Technology Corporation. All rights reserved.
DS8877F-00 April 2018
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1

RT8877F
RT8877F
Ordering Information
RT8877F
Package Type
QW : WQFN-52L 6x6 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Note :
Richtek products are :
RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering processes.
Marking Information
RT8877F
GQW
YMDNN
RT8877FGQW : Product Number
YMDNN : Date Code
Pin Configuration
(TOP VIEW)
52 51 50 49 48 47 46 45 44 43 42 41 40
PWM4 1
TONSET 2
ISEN2P 3
ISEN2N 4
ISEN1N 5
ISEN1P 6
ISEN3P 7
ISEN3N 8
ISEN4N 9
ISEN4P 10
VSEN 11
FB 12
COMP 13
GND
53
39 PGOOD
38 PGOODA
37 EN
36 ISENA1P
35 ISENA1N
34 ISENA2N
33 ISENA2P
32 VSENA
31 FBA
30 COMPA
29 IBIAS
28 VCC
27 OCP_L
14 15 16 17 18 19 20 21 22 23 24 25 26
WQFN-52L 6x6
Copyright ©2018 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS8877F-00 April 2018


Features ® RT8877F Dual-Output PWM Controller f or AMD SVI2 CPU Power Supply General D escription The RT8877F is a 4 + 2 phase s PWM controller, and is compliant with AMD SVI2 Voltage Regulator Specificati on to support both CPU core (VDD) and N orthbridge portion of the CPU (VDDNB). The RT8877F features CCRCOT (Constant C urrent Ripple Constant On-Time) with th e G-NAVP (Green-Native AVP), which is R ichtek's proprietary topology. The G-NA VP makes it an easy setting controller to meet all AMDAVP (Active Voltage Posi tioning) VDD/VDDNB requirements. The dr oop is easily programmed by setting the DC gain of the error amplifier. With p roper compensation, the load transient response can achieve optimized AVP perf ormance. The controller also uses the i nterface to issue VOTF Complete and to send digitally encoded voltage and curr ent values for the VDD and VDDNB domain s. It can operate in single phase and d iode emulation mode and reach up to 90% efficiency in different modes according to different loading co.
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