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Graphics Processor Digital Multiphase Controller
Product Brief
Applications
• Graphics Processors
• Intelligent Point-of-Load (POL) power regulation
Features
• Multiphase power conversion
• 100 kHz to 2 MHz switching frequency
• Internal high precision voltage reference
− ±12.4mV voltage setpoint accuracy
• Startup and maximum voltages set through external resistor
• 2-bit VID input for additional voltage control
• Driver detect prior to soft-start disables unpopulated phases
• Autonomous or user controlled phase dropping based on
current balance and 12V supply faults
• Supports up to three 12V supplies with phase mapping
• Precise digital current balancing with programmable offsets
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
2
• I
C-bus interface for monitoring, control and configuration
• Internal non-volatile memory (NVM) to store custom
configurations
• Extensive fault detection capability
− Input Under-voltage
− Output Under-/Over-voltage
− Per Phase and Total Output Current
− Current balance
− Auxiliary 12V supply (both fault and return reported)
• RoHS compliant 48-lead MLF plastic package
Ordering & Packaging Part Number
Part Number Ambient Package
PX3540BDSG-
XX – XXXXX - X
0 to 85°C
48-lead 7mm x
7mm MLF
PX3540
Description
The PX3540 Graphics Processor Digital Multiphase
Controller provides core power for today’s high current
graphic processors by driving up to si x synchronous-rectified
buck-converter channels in parallel. Interleaved timing of the
channels results in a higher ripple frequency, reducing inpu t
and output ripple. With up to six phases, each capable of up
to 2 MHz operation, the PX3540 can be used to build D C- DC
converters that provide up to 200A with excellent efficiency,
low ripple, and the lowest component count.
The PX3540 utilizes digital technology to implement all
control functions, providing the ultimate in flexibility and
stability. The PX3540 incorporates an industry standard I2Cbus serial interface for control and monitoring. T hrough the
serial interface, the power supply designer can quickly
optimize designs and monitor system performance. The
interface allows the PX3540 to provide digitized information
for real time system monitoring and control.
The PX3540 provides intelligent phase detection capability
allowing the system to operate under the condition of up to 2
(of 3) missing 12V supplies. Autonomous phase control
circuitry will drop phases due to current balance or 12V faults
and add phases when the 12V supply returns. An I
user phase control mode is also provided.
Block Diagram
VSTART
VMAX
RESET_N
VSENP
VSENN
ISEN6+
ISEN6-
ISEN5+
ISEN5-
ISEN4+
ISEN4-
ISEN3+
ISEN3-
ISEN2+
ISEN2-
ISEN1+
ISEN1-
TEMPSEN
V12_SEN
SDA
SADDR1
SADDR0
OUTEN
VID1
VID0
V12_AUX1
V12_AUX2
POR
Current
Sense
Temp
Sense
SCL
I2C
Deglitch
Window
Comparator
(OVP/UVP)
Current
ADC
Oscillator
Internal
Memory
State Machine
Phase Control
Voltage
ADC
AVP
Channel Current
Current
Balance
Ref
PID/PWM
Controller
Digital Calibration Controller
PWM
Driver
Fault Handler
2
C based
PWM6
PWM5
PWM4
PWM3
PWM2
PWM1
FAULT2
FAULT1
VR_READY
PDB-3540-001B Copyright © 2006, Primarion, Inc. 17-Jul-06
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PX35 PX3540
4-Phase Reference Design
+12V aux
+12V main
+12V
(+5V opt)
V12_AUX1
V12_AUX2
+3.3V
VDD
PX3540
VSTART
VMAX
VIDEN_N
To
VID1
VID0
OUTEN
VR_READY
FAULT1
FAULT2
SDA
SCL
SADDR1
SADDR2
TEMPSEN
From
GPU
GPU
Fault
Outputs
I2C I/F
Physical Characteristics (48-lead MLF)
V12_SEN
PWM1
ISEN1-
ISEN1+
PWM2
ISEN2-
ISEN2+
PWM3
ISEN3-
ISEN3+
PWM4
ISEN4-
ISEN4+
PWM5
ISEN5-
ISEN5+
PWM6
ISEN6-
ISEN6+
VSENP
VSENN
GND
UGATE
BOOT
PWM
GND
4.7µF
UGATE
BOOT
PWM
GND
4.7µF
UGATE
BOOT
PWM
GND
4.7µF
PX3511
PX3511
PX3511
PHASE
PVCC
LGATE
PHASE
PVCC
LGATE
PHASE
PVCC
LGATE
8
7
6
VCC
5
8
7
6
VCC
5
8
7
6
VCC
5
VCC
1
2
3
4
1
2
3
4
1
2
3
4
RTN
UGATE
BOOT
PWM
GND
4.7µF
PX3511
PHASE
PVCC
LGATE
8
7
6
VCC
5
RTHERM
1
2
3
4
Printed in the USA/1002/PDF/TK/PS
This document contains information about a new product during its early phase of development. The information contained in this document is based on design targets, simulation results, or early product test results. Characteristic data
and other specifications are subject to change without notice. Customers are advised to confirm information in this advanced product brief prior to using this information or placing an order. Primarion does not assume any liability arising
from the application or use of any product or circuit described herein, neither does it convey any license under its patents or any other rights. Primarion products are not designed, intended, or authorized, or warranted to be suitable for
use in life-support applications, devices or systems or other critical applications. ©2006, Primarion, Inc. Primarion is a registered trademark of Primarion, Inc. The Primarion logos are trademarks of Primarion, Inc.
*Other names and brands are the property of their respective owners. 2780 Skypark Drive, Suite 100, Torrance, CA 90505 1-310-602-5500 Fax 1-310-602-5559 ● www.primarion.com
PDB-3540-001B 2
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