RT8172A Datasheet, PDF (1/40 Pages) Richtek Technology Corporation – Dual Single-Phase PWM Controller

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RT8172A
Dual Single-Phase PWM Controller for CPU and GPU Core
Power Supply
General Description
The RT8172A is a dual single-phase PWM controller with
integrated MOSFET drivers, compliant with Intel IMVP7
Pulse Width Modulation Specification to support both
CPU core and GPU core power. This part adopts G-NAVP^TM
(Green-Native AVP), which is Richtek's proprietary topology
derived from finite DC gain compensator in constant on-
time control mode. The G-NAVP^TM makes this part an
easy setting PWM controller to meet all Intel AVP (Active
Voltage Positioning) mobile CPU/GPU requirements. The
RT8172A uses SVID interface to control an 8-bit DAC for
output voltage programming. The built-in high accuracy
DAC converts the received VID code into a voltage value
ranging from 0V to 1.52V with 5mV step voltage. The
system accuracy of the controller can reach 0.8%. The
RT8172A operates in continuous conduction mode or
diode emulation mode, according to the SVID command.
The maximum efficiency can reach up to 90% in different
operating modes according to different load conditions.
The droop function (load line) can be easily programmed
by setting the DC gain of the error amplifier. With proper
compensation, the load transient response can achieve
optimized AVP performance.
The output voltage transition slew rate is set via the SVID
interface. The RT8172A supports both DCR and sense
resistor current sensing. The RT8172A provides
VR_READY and thermal throttling output signals for
IMVP7 CPU and GPU core. This part also features
complete fault protection functions including over-voltage,
under-voltage, negative-voltage, over-current and thermal
shutdown.
The RT8172A is available in the WQFN-40L 5x5 small
footprint package.
Features
 Dual Single-Phase PWM Controller for CPU Core
and GPU Core Power
 IMVP7 Compatible Power Management States
 Serial VID Interface
 G-NAVP^TM Topology
 AVP for CPU VR Only
 0.5% DAC Accuracy
 0.8% System Accuracy
 Differential Remote Voltage Sensing
 Built-in ADC for Platform Programming
 SETINI/SETINIA for CPU/GPU Core VR Initial
Startup Voltage
 TMPMAX to Set Platform Maximum Temperature
 ICCMAX/ICCMAXA for CPU/GPU Core VR
Maximum Current
 Power Good Indicator : VR_READY/VRA_READY for
CPU/GPU Core Power
 Thermal Throttling Indicator : VRHOT
 Diode Emulation Mode at Light Load Condition
 Fast Line/Load Transient Response
 Switching Frequency up to 1MHz per Phase
 OVP, UVP, NVP, OTP, UVLO, OCP
 RoHS Compliant and Halogen Free
Simplified Application Circuit
VR_READY
VRA_READY
VRHOT
VCLK
VDIO
ALERT
RT8172A
VR_READY
VRA_READY ^PHASE
VRHOT
VCLK
VDIO
PHASEA
ALERT
MOSFET
MOSFET
V_CORE
V_GPU
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS8172A-00 November 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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