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PDF ( 数据手册 , 数据表 ) ISL6364

零件编号 ISL6364
描述 Dual 4-Phase + 1-Phase PWM Controller
制造商 Intersil Corporation
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ISL6364 数据手册, 描述, 功能
Dual 4-Phase + 1-Phase PWM Controller for VR12/IMVP7
Applications
ISL6364
The ISL6364 is a dual PWM controller; its 4-phase PWMs control
the microprocessor core or the memory voltage regulator, while
its single-phase PWM controls the peripheral voltage regulator
for graphics, system agent, or processor I/O.
The ISL6364 utilizes Intersil’s proprietary Enhanced Active Pulse
Positioning (EAPP) modulation scheme to achieve the extremely
fast transient response with fewer output capacitors.
The ISL6364 is designed to be compliant to Intel VR12/IMVP7
specifications. It accurately monitors the load current via the
IMON pin and reports this information via the IOUT register to
the microprocessor, which sends a PSI# signal to the controller
at low power mode via SVID bus. The controller enters 1- or
2-phase operation in low power mode (PSI1); in the ultra low
power mode (PSI2,3), it can further drop the number of phases
and then enable the diode emulation of the operationalphase.
In low power modes, the magnetic core and switching losses are
significantly reduced, yielding high efficiency at light load. After
the PSI# signal is de-asserted, the dropped phase(s) are added
back to sustain heavy load transient response and efficiency.
Today’s microprocessors require a tightly regulated output voltage
position versus load current (droop). The ISL6364 senses the
output current continuously by measuring thevoltage acrossthe
dedicated current sense resistor or the DCRof the output
inductor. The sensed current flows outof the FB pinto develop the
precision voltage drop across the feedback resistor for droop
control. Currentsensing circuitsalso provide the needed signals
for channel-currentbalancing, average overcurrent protection and
individual phase current limiting. TheTM and TMS pins are to
sense anNTC thermistor’s temperature, which is internally
digitizedfor thermal monitoring and for integrated thermal
compensation of the current sense elements of therespective
regulator.
The ISL6364 features remote voltage sensing and completely
eliminates any potential difference between remote and local
grounds. This improves regulation and protection accuracy. The
threshold-sensitive enable input is available to accurately
coordinate the start-up of the ISL6364 with other voltage rails.
Features
• Intel VR12/IMVP7 Compliant
- SerialVID with Programmable IMAX, TMAX, BOOT,
ADDRESS OFFSET Registers
• Intersil’s Proprietary Enhanced Active Pulse Positioning
(EAPP) Modulation Scheme, Patented
- Voltage Feed-forward and Ramp Adjustable Options
- High Frequency and PSI Compensation Options
- Variable Frequency Control During Load Transients to
Reduce Beat Frequency Oscillation
- Linear Control with Evenly Distributed PWM Pulses for
Better Phase Current Balance During Load Transients
•D ual Outputs
- Output 1 (VR0): 1 to 4-Phase, Coupled Inductor
Compatibility, for Core or Memory
- Output 2 (VR1): Single Phase for Graphics, System Agent,
or Processor I/O
- Differential Remote Voltage Sensing
- ±0.5% Closed-loop System Accuracy Over Load, Line and
Temperature
- Phase Doubler Compatibility (NOT Phase Dropping)
• Proprietary Active Phase Adding and Dropping with Diode
Emulation Scheme For Enhanced Light Load Efficiency
•P rogrammable Slew Rate of Fast Dynamic VID for VR0
• Dynamic VID Compensation (DVS) for VR1 at No Droop
• Droop and Diode Emulation Options
• Programmable 1 or 2-Phase Operation in PSI1/2/3 Mode
• Programmable Standard or Coupled-Inductor Operation
• Precision Resistor or DCR Differential Current Sensing
- Integrated Programmable Current Sense Resistors
- Integrated Thermal Compensation
- Accurate Load-Line (Droop) Programming
- Accurate Channel-Current Balancing
- Accurate Current Monitoring
• Average Overcurrent Protection and Channel Current Limit
With Internal Current Comparators
• Precision Overcurrent Protection on IMON & IMONS Pins
• Independent Oscillators, up to 1MHz Per Phase, for Cost,
Efficiency, and Performance Optimization
• Dual Thermal Monitoring and Thermal Compensation
• Start-up Into Pre-Charged Load
• Pb-Free (RoHS Compliant)
December 22 , 2010
FN6861.0
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 |Copyright Intersil Americas Inc. 2010. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
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ISL6364 pdf, 数据表
ISL6364
Absolute Maximum Ratings
VCC, VR_RDY, VR_RDYS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +6V
All Other Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .GND -0.3V to VCC + 0.3V
Recommended Operating Conditions
Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+5V ±5%
Ambient Temperature
ISL6364CRZ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to +70°C
ISL6364IRZ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40°C to +85°C
Thermal Information
Thermal Resistance (Notes 4, 5)
θJA (°C/W) θJC (°C/W)
48 Ld 6x6 QFN Package . . . . . . . . . . . . . . .
27
1.5
Maximum Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . .+150°C
Maximum Storage Temperature Range . . . . . . . . . . . . . .-65°C to +150°C
Pb-free reflow profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see link below
http://www.intersil.com/pbfree/Pb-FreeReflow.asp
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product
reliability and result in failures not covered by warranty.
NOTES:
4. θJA is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See Tech
Brief TB379.
5. For θJC, the “case temp” location is the center of the exposed metal pad on the package underside.
Electrical Specifications Recommended Operating Conditions, VCC = 5V, Unless Other wise specified. Boldface limits apply over the
operating temperature range.
PARAMETER
TEST CONDITIONS
MIN MAX
(Note 7) TYP (Note 7) UNITS
VOLTAGE REGULATOR (VR) ADDRESS
Multiple-Phase Voltage Regulator (VR0) ADDRESS
0 EVN C
Single-Phase Voltage Regulator (VR1) ADDRESS
1 ODD 7
VCC SUPPLY CURRENT
Nominal Supply
VCC = 5VDC; EN_PWR = 5VDC; RT = 125kΩ,
ISEN1-4 = 80µA, ISL6364, 400kHz
21 28 33.5 mA
Shutdown Supply
POWER-ON RESET AND ENABLE
VCC = 5VDC; EN_PWR = 0VDC; RT = 125kΩ
14 21 27.5 mA
VCC Rising POR Threshold
4.30 4.40 4.50
V
VCC Falling POR Threshold
3.75 3.90 4.00
V
EN_PWR_FT Rising Threshold
0.830 0.850 0.870 V
EN_PWR_FT Falling Threshold
0.730 0.750 0.770 V
EN_VTT Rising Threshold
0.830 0.850 0.870 V
EN_VTT Falling Threshold
0.730 0.750 0.770 V
REFERENCE VOLTAGE AND DAC
System Accuracy of ISL6364CRZ
(VID = 1V to 2.155V, TJ = 0°C to +70°C)
System Accuracy of ISL6364CRZ
(VID = 0.8V to 1V, TJ = 0°C to +70°C)
System Accuracy of ISL6364CRZ
(VID = 0.25V to 0.8V, TJ = 0°C to +70°C)
System Accuracy of ISL6364IRZ
(VID = 1V to 2.155V, TJ = -40°C to +85°C)
System Accuracy of ISL6364IRZ
(VID = 0.8V to 1V, TJ = -40°C to +85°C)
System Accuracy of ISL6364IRZ
(VID = 0.25V to 0.8V, TJ = -40°C to +85°C)
(Note 6, Closed-Loop)
(Note 6, Closed-Loop)
(Note 6, Closed-Loop)
(Note 6, Closed-Loop)
(Note 6, Closed-Loop)
(Note 6, Closed-Loop)
-0.5 - 0.5 %VID
-5 - 5 mV
-8 - 8 mV
-0.6 - 0.6 %VID
-6 - 6 mV
-9 - 9 mV
8 FN6861.0
December 22, 2010







ISL6364 equivalent, schematic
ISL6364
TABLE 3. PHASE DROPPING CONFIGURATION AT PSI1 AND
PSI2/3/DECAY
SICI NPSI CODE
PSI1 Mode
PSI2/3
& DECAY
0 0 SI1 SI, (N-1)-CI
1-Phase
1-Phase
0 1 SI2 SI, (N-2)-CI 2-Phase
1-Phase
1 0 CI1 2-Phase CI 1-Phase
1-Phase
1 1 CI2 2-Phase CI 2-Phase
1-Phase
NOTE: For 2-Phase CI option, the dropped coupled phase turns on LGATE
to circulate current when PWM1 is high.
The VR1 output can be disabled by pulling PWMS to VCC while the
respective address is released for use with a different VR controller.
For proper operation of VR0, the VR1’s respective pins should be
configured as described in “Disabling Output” on page 35.
While the controller is operational (VCC above POR, EN_VTT and
EN_PWR are both high, valid VID inputs), it can pull the PWM pins
to ~40% of VCC (~2V for 5V VCC bias) during various stages, such
as soft-start delay, phase shedding operation, or fault conditions
(OC or OV events). The matching driver's internal PWM resistor
divider can further raise the PWM potential, but not lower it
below the level set by the controller IC. The controller's PWM
outputs are directly compatible with Intersil drivers that require
5V PWM signal amplitudes. Drivers requiring 3.3V PWM signal
amplitudes are generally incompatible.
Diode Emulation Operation
To improve light efficiency, the ISL6364 can enter diode
emulation operation in PSI2/3 or Decay mode. Users however
should select Intersil VR12/IMVP7 compatible drivers: ISL6627
or ISL6625 for PSI# channel(s). The diode emulation should be
disabled if non-compatible power stages or drivers are used.
Switching Frequency
Both VR0 and VR1 can independently set switching frequency,
which is determined by the selection of the frequency-setting
resistor, RT, which is connected from FS or FSS pin to GND or
VCC. Equation 4 and Figure 4 are provided to assist in selecting
the correct resistor value.
RT = 5-----F----1S---0W---1----0-
(EQ. 4)
where FSW is the switching frequency of each phase.
Independent frequency for VR0 and VR1 allows for cost,
efficiency, and performance optimization. Proximity between the
power trains of the two regulators imposed by the space-
constrained layouts can lead to cross-coupling. To minimize the
effect of cross-coupling between regulators, select operating
frequencies at least 50kHz apart.
SWITCHING FREQUENCY (Hz)
FIGURE 4. SWITCHING FREQUENCY vs RT
Current Sensing
The ISL6364 senses current continuously for fast response. The
ISL6364 supports inductor DCR sensing, or resistive sensing
techniques. The associated channel current sense amplifier uses
the ISEN inputs to reproduce a signal proportional to the inductor
current, IL. The sense current, ISEN, is proportional to the inductor
current. The sensed current is used for current balance, load-line
regulation, and overcurrent protection.
The internal circuitry, shown in Figures 5-6 and 9-10, represents
VR1’s channel or one channel of the VR0 output, respectively. For
VR0 output, the ISEN± circuitry is repeated for each channel, but
may not be active depending on the status of the PWM2, PWM3,
and PWM4 pins, as described in “PWM and PSI# Operation” on
page 15. The input bias current of the current sensing amplifier
is typically 60nA; less than 8.34kΩ input impedance (0.5mV
offset) is preferred to minimized the offset error, i.e., a larger C
value as needed.
INDUCTOR DCR SENSING
An inductor’s winding is characteristic of a distributed resistance,
as measured by the DCR (Direct Current Resistance) parameter.
Consider the inductor DCR as a separate lumped quantity, as
shown in Figure 5. The channel current IL, flowing through the
inductor, will also pass through the DCR. Equation 5 shows the s-
domain equivalent voltage across the inductor VL.
VL(s) = IL ⋅ (s L + DCR)
(EQ. 5)
A simple R-C network across the inductor extracts the DCR
voltage, as shown in Figure 5.
16 FN6861.0
December 22, 2010










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