Document
SENSEVOLTE- RRDAoCNOotNFRIeDpEroNdTIuAcLe SENSE+ Idesbus & Clock
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 highest 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 controller (VT1165M), multiple Smart Slave™ integrated output devices, input capacitors, output capacitors and output inductors. 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 during 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.
DOCUMENT
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 Setp.