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Primarion VR Chipset
PX3538/9
Digital Controllers
• Up to 2 MHz switching
• 1 to 6 phases
• Reduced output cap
– 100A, 1000A/us with 500uF MLCC
• Current sense calibration
– Built-in cal on startup
• Digital temperature compensation
• I2C interface
– Monitor I,V, T, faults
– Real-time voltage control
• Use with discrete or integrated power
stage
• +3.3V supply, QFN package
2017/5/23
PX3520
Integrated Power Stage
•
•
•
•
30A Power Stage
Integrated control FET and drivers
Integrated current and temp sensor
Discrete sync FET
– Customize for each application
• CSP package
– Lead or lead-free available
PX3511 Driver
• High performance FET Driver
– 3.3V Logic compatible
• “A” Version:
– Variable low-side drive
• “B” Version:
– Variable low and high-side driver
p. 1
PX3538 6-phase
Controller
Block Diagram
• Integrated voltage and
current digitizers
• Programmable digital
control loop
• Programmable fault
settings
• Integrated non-volatile
memory
Window
Comparator
(OVP/UVP)
VSENP
VSENN
RESET_N
ISEN1+
ISEN1ISEN2+
ISEN2ISEN3+
ISEN3ISEN4+
ISEN4ISEN5+
ISEN5ISEN6+
ISEN6TEMP_SEN
PWM1
POR
PWM2
Voltage
ADC
PWM3
Current
Sense
PWM
Driver
Current
Balance
PID/PWM
Controller
Current
ADC
Channel
Current
PWM4
PWM5
AVP
PWM6
Temp
Sense
V12_SEN
IOUT
SCL
SDA
I2C
VR_HOT
Internal Memory
Fault Handler
SADDR
VR_FAN
VR_EN
VID7
VID6
SS
VID5
VID4
VID3
CAL_CUR_SEN
Deglitch
Digital Calibration Controller
State Machine
CAL_CUR_EN
VID2
VID1
VID0
VID_SEL
2017/5/23
VR_READY
p. 2
PX3525 Integrated Power Stage
3.3V
•Integrated high and lowside current sensor
Boot
VCC
Reference
and POR
Driver
– Process and temp
insensitive
•Pulse-by-pulse OCP
•Integrated temp sensor
•Low RDSon FETs
– 15 mOhm high-side
– 2 mOhm low-side
PWM
VSW
ISENSE
Driver
PGND
I-Limit
VSW
PWM
– 20% duty factor
2017/5/23
I-sense
and
OCP
Logic and
Non-overlap
Control
•30A per phase
•CSP package
VCC
HS Short
Detect
HSS
Temperature
Sense
TEMP
Signal GND
p. 3
2017/5/23
p. 4
Low Cost VR Solutions
• VR11 Applications
–
–
0.8 to 1.6V
1200A/us
• 6-phase digital controller
–
–
–
Self calibrating current sense
Low output cap technology
I2C bus for monitoring & control
• Discrete drivers and FETs
Discrete 2U VRM solution
82% Efficiency at 1.25V & 130A
2017/5/23
p. 5
High Current Density VR Solutions
• VR11 Applications
– 0.8 to 1.6V
– 1200A/us
• 6-phase digital controller
– Self calibrating current sense
– Low output cap technology
– I2C bus for monitoring & control
• Integrated Power Stage & FET
2017/5/23
Integrated 1U VRM solution
84% Efficiency at 1.25V & 130A
Integrated VRD Solution
87% Efficiency at 1.2V & 130A
p. 6
VR Power Code User Interface
• Easy to use GUI
• Runs on any PC with
USB interface
• Configure system
parameters
• Monitor telemetry and
faults
• Fine tune feedback
loop and set fault trip
thresholds
2017/5/23
p. 7
PX3542 Graphics Controller Features
•
•
•
•
•
4- to 6-phase operation
Maximum current: 150A
Output voltage: 0.5V - 1.6V
Switching frequency: 100 kHz to 2 MHz
Internal high precision voltage reference
– 10mV voltage setpoint accuracy
• Startup and maximum voltages set through external
resistor (tamper resistant)
– 2-bit VID input for final voltage set
• Programmed in NVM, vmax resistor limits max output
• “Plug and play” extra phases
– Driver detect prior to soft-start disables unpopulated phases
– Phase dropping based on current balance
2017/5/23
p. 8
PX3542 Graphics Controller Features
• Programmable current balance offset (+/- 10%) for
thermal balancing
• Digitally programmable loadline and loop compensation
• Digital temperature sensor compensation
• Active Transient Response (ATR) enables meeting
transient requirements with reduced output capacitance
• I2C-bus interface for monitoring, control and
configuration
– Current & Voltage readout
– Query “Fault” details (out of balance channel etc.)
2017/5/23
• Internal NVM to store custom configurations with eight
programmable active voltage position (AVP) system
configurations
• RoHS compliant 48-ld QFN package
p. 9
PX3542 Fault Detection Capability
• Extensive fault detection capability with two
user configurable output fault pins
– Input Under-voltage
– Output Under-/Over-voltage
– Per Phase and Total Output Current
– Current balance
– Auxiliary 12V supply
• (both fault and return reported)
– Multiple Internal and External Temperature Limits
2017/5/23
p. 10
PX3542 Graphics Application Example
+12V aux
+12V main
+12V (+5V opt)
PX3511
1 UGATE
PHASE 8
2 BOOT
PVCC 7
3 PWM
VCC 6
4 GND
4.7mF
V12_AUX1
V12_SEN
V12_AUX2
GND
PX3542
+3.3V
VDD
LGATE 5
PX3511
1 UGATE
PHASE 8
2 BOOT
PVCC 7
IS1P
3 PWM
VCC 6
IS1N
4 GND
4.7mF
PWM1
`
LGATE 5
PWM2
VSTART
VMAX
IS2P
IS2N
PWM3
From
GPU
To
GPU
Fault
Outputs
2017/5/23
PVCC 7
IS3P
2 BOOT
VID1
IS3N
3 PWM
VID0
PWM4
4 GND
4.7mF
VCC 6
LGATE 5
IS4P
RTN
IS4N
VR_READY
PWM5
PX3511
IS5P
1 UGATE
PHASE 8
FAULT1
IS5N
2 BOOT
PVCC 7
FAULT2
PWM6
IS6P
I2C I/F
PHASE 8
VIDEN_N
OUTEN
VCC
PX3511
1 UGATE
SDA
IS6N
SCL
TEMP_SEN
SADDR1
VSENP
SADDR0
VSENN
3 PWM
4 GND
4.7mF
VCC 6
LGATE 5
RTHERM
p. 11
Low Cost Graphics Solutions
• High End Graphics
Applications
–
–
–
0.5V to 1.6V
up to 2MHz switching freq
150A max
• 6-phase digital controller
–
–
–
–
–
Self calibrating current sense
Low output cap technology
I2C bus for monitoring & control
Auto driver detect
Auto current balance phase drop
• Discrete drivers and FETs
Discrete VRD solution
84% Efficiency at 1.25V & 130A
2017/5/23
p. 12
GPU Power Code User Interface
• Easy to use GUI
• Runs on any PC with
USB interface
• Configure system
parameters
• Monitor telemetry and
faults
• Fine tune feedback
loop and set fault trip
thresholds
2017/5/23
p. 13
Di-POLTM PX7510 Block Diagram
SYNC_IN
SYNC_OUT
Reference
&
Oscillator
FSET
VSET
VTRIM
VSENP
VSENN
TEMPSEN
Temp
Sense
ISENP
ISENN
IMAXSET
Current
Sense
SCLK
SDATA
SADDR
SMBus
2017/5/23
IOUT/ISH
ISH_GND
Voltage
Sense
V12SEN
OUTEN
DAC
MUX
ADC
PID/PWM
Controller
PWM
VCC
Non-Volatile Memory
(NVM)
Fault
Handler
State Machine
SMB_AL_N
FAULT1
FAULT2
PWRGD
p. 14
Di-POLTM PX7510 Application Example
Single-Phase POL Converter
+5V to +12V
+5V
R1
SDATA
PMBus I/F
V12SEN
SCLK
VCC
SMB_ALRT_N
Power
Management
I/F
R2
PX7510
PWRGD
GND
OUTEN
2 BOOT
PWM
Multiphase
Operation
3 PWM
PHASE 8
VOUT
EN 7
VCC 6
RB
SYNC_IN
SYNC_OUT
1 UGATE
4 GND
4.7mF
TEMPSEN
LGATE 5
RCM
CB
D1
LOAD
ISENN
Fault
Outputs
FAULT1
ISENP
FAULT2
VSENP
RSENSE
VSENN
I-share
IOUT/ISH
SADDR
ISH_GND
VSET
RTN
FSET
VTRIM
IMAXSET
2017/5/23
p. 15