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PDF ( 数据手册 , 数据表 ) VT1165M

零件编号 VT1165M
描述 MULTIPHASE SWITCHING REGULATOR
制造商 Volterra Semiconductor
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VT1165M 数据手册, 描述, 功能
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







VT1165M pdf, 数据表
VT1165M CHIPSET PRELIMINARY
PROPRIETARY AND CONFIDENTIAL
PROGRAMMABLE OUTPUT, MULTIPHASE SWITCHING REGULATOR WITH SMBus
TYPICAL OPERATING CHARACTERISTICS (CONTINUED)
System Efficiency - 5 VT1105S Slaves
95%
Estimated Power Dissipation - 1 VT1105S Slave
7
90%
85%
80%
75%
70%
65%
0
VID = 1.6V
VID = 1.4V
VID = 1.2V
20 40 60 80 100
Output Current (A)
Conditions: VIN = 12V
LOUT = 120nH
Fsw = 804kHz
TA = 25°C
Loadline (@ VSENSE) = 1.25m
VOUT Measured @ Inductor
120
6
5
4
3
2
Vout = 1.6V
1 Vout = 1.4V
Vout = 1.2V
0
0 2 4 6 8 10 12 14 16 18 20 22 24 26
Output Load (A)
Conditions: VIN = 1.2V
LOUT = 120nH
Fsw = 850kHz
TJ = 100°C
Typical System Efficiency - 3 VT1135S Slaves
95%
Estimated Power Dissipation - 1 VT1135S Slave
7
90%
85%
80%
75%
70%
65%
0
VID = 1.6V
VID = 1.4V
VID = 1.2V
20 40 60 80 100 120 140 160
Output Load (A)
Conditions: VIN = 12V
LOUT = 50nH, 3 phase Coupled L
Fsw = 800kHz
TA = 25°C
System Loadline = 1.25m
VOUT Measured @ Inductor
6
5
4
3
2
Vout = 1.6V
1 Vout = 1.4V
Vout = 1.2V
0
0 2 4 6 8 10 12 14 16 18 20 22 24 26
Output Load (A)
Conditions: VIN = 1.2V
LOUT = 120nH
Fsw = 850kHz
TJ = 100°C
8 Volterra Semiconductor Corp. Proprietary. Do Not Copy. Do Not Distribute.
REVISED - 12/08/05







VT1165M equivalent, schematic
VT1165M CHIPSET PRELIMINARY
PROPRIETARY AND CONFIDENTIAL
PROGRAMMABLE OUTPUT, MULTIPHASE SWITCHING REGULATOR WITH SMBus
than eight slaves should be connected to a single master,
due to fan-out limitations.
Because the architecture requires no additional components
or other modifications to support different output currents, a
single PCB layout can support a wide range of load currents
with simple loading (or unloading) options. The VT1165M
supports all Smart Slave™ devices in Volterra's fourth gen-
eration architecture.
The maximum output current of each slave is selected by
connecting a resistor between the R_SEL4 pin and ground.
Tables 1A and 1B provide lists of typical values for R_SEL4
and IMAX. For example, in a VT1125S system where the
maximum operating current per slave is 20A, choosing
IMAX = 24A is the recommended setting to provide headroom
for excursions around the 20A operating value.
Fore each IMAX setting (programmed by R_SEL4), there are
two relevant current levels: IOCP and ISC_PK. IOCP indicates the
current level at which the system enters the user-specified
OCP mode (i.e., hiccup, latchoff or CCM.) ISC-PK indicates
the peak current observable during short-circuit conditions.
The average DC short-circuit current depends on the OCP
mode chosen. Tables 1C and 1D provide detailed current
levels.
The R_SEL4 resistor also controls an internal slave setting
which affects the current control algorithm during an unloading
transient. For applications using uncoupled inductors, internal
setting “1” is recommended to minimize the output voltage
overshoot during a transient event.When using coupled induc-
tors, setting “3” will provide the optimal transient response.
Output Voltage Programming
The output voltage of the VT1165M chipset is digitally program-
mable from 0.800V to 1.850V with a DC set point accuracy
of ±0.8%. The master controller provides built-in support for
the industry standard VID codes as follows:
Table 1A: IMAX Programming for VT1105S and
VT1125S
R_SEL4 () IMAX (A) Internal Slave Setting
340 24
1
1.02k
24
2
1.74k
24
3
2.43k
24
4
5.90k
32
1
6.49k
32
2
7.15k
32
3
7.87k
32
4
8.66k
28
4
9.31k
28
3
10.0k
28
2
10.7k
28
1
16 Volterra Semiconductor Corp. Proprietary. Do Not Copy. Do Not Distribute.
Table 1B: IMAX Programming for VT1115S and
VT1135S
R_SEL4 () IMAX (A) Internal Slave Setting
340 (GND)
24
1
1.02k
24
2
1.74k
24
3
2.43k
24
4
3.09k
36
4
3.74k
36
3
4.42k
36
2
5.11k
36
1
5.90k
32
1
6.49k
32
2
7.15k
32
3
7.87k
32
4
8.66k
28
4
9.31k
28
3
10.0k
28
2
10.7k
28
1
11.3k
26
1
12.1k
26
2
13.0k
26
3
14.0k
26
4
15.4k
38
4
16.9k
38
3
18.7k
38
2
20.5k
38
1
23.7k
34
1
27.4k
34
2
31.6k
34
3
39.2k
34
4
49.9k
30
4
69.8k
30
3
118k
30
2
348k (VDD)
30
1
Table 1C: IOCP Levels for All IMAX Settings
IMAX Setting Programmed by
IOCP (A)
R_SEL4 (A)
Min Typ
24 20.9 22.6
26 22.7 24.5
28 25.0 26.3
30 26.3 28.2
32 28.0 30.1
34 30.0 32.0
36 31.6 33.9
38 33.4 35.8
Max
24.2
26.2
28.2
30.2
32.2
34.2
36.1
38.1
REVISED - 12/08/05










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