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Volterra Semiconductor - MULTIPHASE SWITCHING REGULATOR

Numéro de référence VT1165M
Description MULTIPHASE SWITCHING REGULATOR
Fabricant Volterra Semiconductor 
Logo Volterra Semiconductor 





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VT1165M fiche technique
Vendor PN:VT1165MFQX
PRELIMINARY
VT1165M CHIPSET
REVISION - December 8, 2005
PROGRAMMABLE OUTPUT, MULTIPHASE SWITCHING
REGULATOR WITH SMBus
Smart Current Input
Slave™ Rating Voltage
VT1105S* 25A per
VT1125S Phase
10.8V to
VT1115S 30A per 13.2V
VT1135S Phase
Output
Voltage
0.800V
to
1.850V
or
0.450V
to
2.0375V
VID
VRMs 9,
10.X, and
Opteron™ or
Serial VID
(SVID) Mode
GENERAL DESCRIPTION
The VT1165M chipset, Volterra’s fourth-generation chipset,
is a complete, integrated, scalable architecture for the high-
est density multi-phase synchronous buck regulators. This
ultra high density solution minimizes external components
and offers enhanced regulator performance, comprehensive
control and reporting features, ease of design and the smallest
footprint available for demanding multi-phase synchronous
buck converters. The chipset is targeted for applications
such as servers and networking systems.
The VT1165M system architecture consists of a master con-
troller (VT1165M), multiple Smart Slave™ integrated output
devices, input capacitors, output capacitors and output induc-
tors. The actual number of Smart Slaves™ can be set by the
designer and application requirements. The desired slave
and load operating conditions are controlled and monitored
via an interconnecting digital bus as shown in Figure 1.
With this chipset, Volterra implements enhancements to
the digital SMBus interface for monitoring and controlling
of the voltage regulator. Regulator parameters can be set and
monitored via the two-way SMBus for control, protection and
shutdown of the regulator. The SMBus can provide a reading
of faults such as VX short-circuit or slave over-temperature,
so that the regulator can be controlled and protected dur-
ing all operating conditions. The SMBus can also provide
temperature readings of individual slaves.
A key benefit of the VT1165M is that it provides excellent
scalability. This flexibility allows the designer to trade-off cost
and performance for a given application using one VT1165M
controller and different slave configurations with no redesign
or re-layout. The number of phases can be determined by
the designer and easily populated or de-populated to meet
different load and performance targets.
KEY FEATURES
Smallest Footprint: Typical Solution Occupies Less
than 1600mm2 in a 150A VRM Application
Lowest Profile: 5mm Maximum Height
Highest Accuracy Current Sharing
Differential Voltage Sense at Point of Load
1A/ns Step Load Transient Response
Scalable Output Current: Up to 8 Slaves
Slave Temperature Reporting
Compatible with Coupled Inductors
Programmable Switching Frequency: 500kHz-
1.5MHz
6-Bit VID Input, with 12.5mV Steps and Setpoint
Trim for Programmable VOUT
– Intel® VRM 9: 1.100V-1.850V
– Intel® VRM 10.X: 0.8375V-1.6000V
– AMD® Opteron™: 0.800V-1.550V
– Serial VID (SVID) Mode: 0.450V-2.0375V
Dynamic VID
Programmable VID via SMBUS
Programmable Setpoint and Droop
Programmable OVP, OVLO and UVLO
Cycle-by-Cycle Current Limiting
Power Good Flag, Fault Flag and Output Enable
SYSTEMS
Servers and Workstations
Enterprise Storage
Broadband Communication & Networking
Small Form Factor Desktops
APPLICATIONS
Voltage Regulator Modules (VRMs) and On-Board
Regulators (VR Down)
Microprocessors (µP): 32 and 64 Bit I/A and RISC
Architectures
Memory
Graphics Processors
Network, Chipset ICs
BASIC APPLICATION CIRCUIT
3.3V
SMBus
VT1165M
Master
Digital
Control Bus
3.3V 12V
VT11x5S VX1
Slave 1
LOUT1
3.3V 12V
VT11x5S VX2
Slave 2
LOUT2
COUT
VOUT
*NOTE: The VT1165M, VT1115S, VT1125S & VT1135S have
a status of PRELIMINARY. The VT1105S has a
status of NEW PRODUCT. See the back page of
this datasheet for details on these statuses.
Volterra Semiconductor Corp. Proprietary. Do Not Copy. Do Not Distribute.
3.3V 12V
VT11x5S VXN
Slave N
LOUTN
Figure 1. VT1165M System Architecture
1

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