isl6312a Intersil Corporation, isl6312a Datasheet

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isl6312a

Manufacturer Part Number
isl6312a
Description
Four-phase Buck Pwm Controller With Integrated Mosfet Drivers For Intel Vr10, Vr11, And Amd Applications
Manufacturer
Intersil Corporation
Datasheet

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Four-Phase Buck PWM Controller with
Integrated MOSFET Drivers for Intel VR10,
VR11, and AMD Applications
The ISL6312A four-phase PWM control IC provides a
precision voltage regulation system for advanced
microprocessors. The integration of power MOSFET drivers
into the controller IC marks a departure from the separate
PWM controller and driver configuration of previous
multiphase product families. By reducing the number of
external parts, this integration is optimized for a cost and
space saving power management solution.
One outstanding feature of this controller IC is its
multi-processor compatibility, allowing it to work with both
Intel and AMD microprocessors. Included are programmable
VID codes for Intel VR10, VR11, as well as AMD DAC
tables. A unity gain, differential amplifier is provided for
remote voltage sensing, compensating for any potential
difference between remote and local grounds. The output
voltage can also be positively or negatively offset through
the use of a single external resistor.
The ISL6312A also includes advanced control loop features
for optimal transient response to load apply and removal.
One of these features is highly accurate, fully differential,
continuous DCR current sensing for load line programming
and channel current balance. Active Pulse Positioning (APP)
modulation is another unique feature, allowing for quicker
initial response to high di/dt load transients.
This controller also allows the user the flexibility to choose
between PHASE detect or LGATE detect adaptive dead time
schemes. This ability allows the ISL6312A to be used in a
multitude of applications where either scheme is required.
Protection features of this controller IC include a set of
sophisticated overvoltage, undervoltage, and overcurrent
protection. Furthermore, the ISL6312A includes protection
against an open circuit on the remote sensing inputs.
Combined, these features provide advanced protection for
the microprocessor and power system.
®
1
Data Sheet
1-888-INTERSIL or 1-888-468-3774
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Features
• Integrated Multiphase Power Conversion
• Precision Core Voltage Regulation
• Optimal Transient Response
• Fully Differential, Continuous DCR Current Sensing
• User Selectable Adaptive Dead Time Scheme
• Variable Gate Drive Bias: 5V to 12V
• Multi-Processor Compatible
• Microprocessor Voltage Identification Inputs
• Overcurrent Protection
• Load Current Indicator
• Multi-Tiered Overvoltage Protection
• Digital Soft-Start
• Selectable Operation Frequency up to 1.5MHz Per Phase
• Pb-Free Plus Anneal Available (RoHS Compliant)
Ordering Information
NOTE: Intersil Pb-free plus anneal products employ special Pb-free
material sets; molding compounds/die attach materials and 100% matte
tin plate termination finish, which are RoHS compliant and compatible
with both SnPb and Pb-free soldering operations. Intersil Pb-free
products are MSL classified at Pb-free peak reflow temperatures that
meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
*Add “-T” suffix for tape and reel. Please refer to TB347 for details on
reel specifications.
PART NUMBER
ISL6312ACRZ* ISL6312 ACRZ 0 to +70 48 Ld 7x7 QFN L48.7x7
ISL6312AIRZ*
- 2-Phase or 3-Phase Operation with Internal Drivers
- 4-Phase Operation with External PWM Driver Signal
- Differential Remote Voltage Sensing
- ±0.5% System Accuracy Over-Temperature
- Adjustable Reference-Voltage Offset
- Active Pulse Positioning (APP) Modulation
- Adaptive Phase Alignment (APA)
- Accurate Load Line Programming
- Precision Channel Current Balancing
- PHASE Detect or LGATE Detect for Application
- Intel VR10 and VR11 Modes of Operation
- AMD Mode of Operation
- 8-bit DAC
- Selectable between Intel’s Extended VR10, VR11, AMD
- Dynamic VID Technology
Flexibility
5-bit, and AMD 6-bit DAC Tables
(Note)
August 1, 2007
All other trademarks mentioned are the property of their respective owners.
|
Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2006, 2007. All Rights Reserved
ISL6312 AIRZ -40 to +85 48 Ld 7x7 QFN L48.7x7
MARKING
PART
TEMP.
(°C)
ISL6312A
PACKAGE
(Pb-Free)
FN9290.3
DWG. #
PKG.

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isl6312a Summary of contents

Page 1

... This controller also allows the user the flexibility to choose between PHASE detect or LGATE detect adaptive dead time schemes. This ability allows the ISL6312A to be used in a multitude of applications where either scheme is required. Protection features of this controller IC include a set of sophisticated overvoltage, undervoltage, and overcurrent protection ...

Page 2

... Pinout VID4 VID3 VID2 VID1 VID0 VRSEL DRSEL OVPSEL SS VCC REF OFS ISL6312A Integrated Driver Block Diagram DRSEL PWM SOFT-START AND FAULT LOGIC 2 ISL6312A ISL6312A ISL6312A (48 LD QFN) TOP VIEW GND ...

Page 3

... VID2 I_TRIP VID1 VID0 REF E/A FB COMP OFFSET OFS I_AVG x1 IOUT OCP V OCP CH1 CURRENT SENSE ISEN1- ISEN1+ ISEN2- ISEN2+ 3 ISL6312A ISL6312A PGOOD SS SOFT-START AND FAULT LOGIC 0.2V LOAD APPLY TRANSIENT ENHANCEMENT CLOCK AND MODULATOR WAVEFORM GENERATOR ∑ OC ∑ ∑ ∑ I_AVG CHANNEL 1 ...

Page 4

... Typical Application - ISL6312A (4-Phase) FB VDIFF COMP VSEN RGND +5V VCC OFS FS REF SS OVPSEL ISL6312A VID7 VID6 VID5 VID4 VID3 VID2 VID1 VID0 VRSEL PGOOD +12V EN IOUT DRSEL GND 4 ISL6312A ISL6312A +12V BOOT1 UGATE1 PHASE1 LGATE1 ISEN1- ISEN1+ +12V PVCC1_2 BOOT2 UGATE2 PHASE2 ...

Page 5

... Typical Application - ISL6312A with NTC Thermal Compensation (4-Phase) VDIFF FB COMP VSEN RGND +5V VCC OFS FS REF SS OVPSEL VID7 ISL6312A VID6 VID5 VID4 VID3 VID2 VID1 VID0 VRSEL PGOOD +12V EN IOUT DRSEL GND 5 ISL6312A ISL6312A +12V BOOT1 UGATE1 PHASE1 LGATE1 ISEN1- ISEN1+ +12V ...

Page 6

... BOOT - PHASE - 0. 0.3V BOOT Recommended Operating Conditions + 0.3V BOOT VCC Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+5V ±5% PVCC Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . +5V to 12V ±5% Ambient Temperature (ISL6312ACRZ 0°C to +70°C Ambient Temperature (ISL6312AIRZ .-40°C to +85°C TEST CONDITIONS high VCC high PVCC1_2 high ...

Page 7

... Undervoltage Hysteresis Overvoltage Threshold During Soft-Start Overvoltage Threshold (Default) Overvoltage Threshold (Alternate) Overvoltage Hysteresis SWITCHING TIME (Note 3) UGATE Rise Time LGATE Rise Time 7 ISL6312A ISL6312A TEST CONDITIONS R = 10kΩ from OFS to GND OFS R = 30kΩ from OFS to VCC OFS R = 10k to ground, (Note 3) ...

Page 8

... Lower Drive Source Resistance Lower Drive Sink Resistance OVER TEMPERATURE SHUTDOWN (Note 3) Thermal Shutdown Setpoint Thermal Recovery Setpoint Timing Diagram t PDHUGATE UGATE LGATE t FLGATE 8 ISL6312A ISL6312A TEST CONDITIONS 12V, 3nF load, 90% to 10% FUGATE; PVCC 12V, 3nF load, 90% to 10% FLGATE; PVCC ...

Page 9

... VSEN and RGND are inputs to the precision differential remote-sense amplifier and should be connected to the sense pins of the remote load. 9 ISL6312A ISL6312A VDIFF VDIFF is the output of the differential remote-sense amplifier. The voltage on this pin is equal to the difference between VSEN and RGND. FB and COMP These pins are the internal error amplifier inverting input and output respectively ...

Page 10

... Microprocessor load current profiles have changed to the point that using single-phase regulators is no longer a viable solution. Designing a regulator that is cost-effective, thermally sound, and efficient has become a challenge that only multiphase converters can accomplish. The ISL6312A 10 ISL6312A ISL6312A controller helps simplify implementation by integrating vital functions and requiring minimal external components. The “ ...

Page 11

... PWM time interval. This prevents the occurrence of double PWM pulses occurring during a single period. To further improve the transient response, ISL6312A also implements Intersil’s proprietary Adaptive Phase Alignment (APA) technique, which turns on all phases together under transient events with large step current ...

Page 12

... ISL6312A ISL6312A The ISL6312A supports inductor DCR current sensing to continuously sense each channel’s current for channel-current balance. The internal circuitry, shown in Figure 5 represents Channel N-channel converter. This circuitry is repeated for each channel in the converter, but may not be active depending on how many channels are operating ...

Page 13

... L R ISEN Output Voltage Setting The ISL6312A uses a digital to analog converter (DAC) to generate a reference voltage based on the logic signals at the VID pins. The DAC decodes the logic signals into one of the discrete voltages shown in Tables and 5. In Intel modes of operation, each VID pin is pulled internal 1.2V voltage by a weak current source (40μ ...

Page 14

... ISL6312A TABLE 2. VR10 (EXTENDED) VOLTAGE IDENTIFICATION VID6 VDAC VID4 0 0 1.35625 1.35000 1.34375 1.33750 1.33125 1.32500 1.31875 ...

Page 15

... ISL6312A TABLE 3. VR11 VOLTAGE IDENTIFICATION CODES VID5 VID6 VDAC VID7 VID6 VID5 VID4 VID3 VID2 VID1 VID0 1 0 0.89375 0.88750 0.88125 0.87500 0.86875 ...

Page 16

... ISL6312A TABLE 3. VR11 VOLTAGE IDENTIFICATION CODES VDAC VID7 VID6 VID5 VID4 VID3 VID2 VID1 VID0 0 0 1.21250 1.20625 1.20000 1.19375 1.18750 ...

Page 17

... ISL6312A TABLE 4. AMD 5-BIT VOLTAGE IDENTIFICATION CODES VDAC VID4 1 0 0.72500 0.71875 0.71250 0.70625 0.70000 0.69375 0.68750 ...

Page 18

... DAC) and offset errors in the OFS current source, 1 0.8250 remote-sense and error amplifiers. Intersil specifies the 0 0.8000 guaranteed tolerance of the ISL6312A to include the combined tolerances of each of these elements. 1 0.7750 0 0.7625 The output of the error amplifier, V triangle waveform to generate the PWM signals. The PWM 1 0 ...

Page 19

... Therefore the equivalent loadline impedance, i.e. droop impedance, is equal to Equation 11 Output-Voltage Offset Programming - The ISL6312A allows the designer to accurately adjust the DIFFERENTIAL offset voltage by connecting a resistor, R REMOTE-SENSE AMPLIFIER pin to VCC or GND. When R and VCC, the voltage across it is regulated to 1.6V. This causes a proportional current (I ...

Page 20

... Dynamic VID Modern microprocessors need to make changes to their core voltage as part of normal operation. They direct the ISL6312A to do this by making changes to the VID inputs. The ISL6312A is required to monitor the DAC inputs and respond to on-the- fly VID changes in a controlled manner, supervising a safe output voltage transition without discontinuity or disruption ...

Page 21

... Q1 V GS1 Gate Drive Voltage Versatility The ISL6312A provides the user flexibility in choosing the gate drive voltage for efficiency optimization. The controller ties the upper and lower drive rails together. Simply applying a voltage from 12V on PVCC sets both gate drive rail voltages simultaneously ...

Page 22

... VR voltage at 1.1V for another fixed period TD3. At the end of TD3 period, ISL6312A will read the VID signals. If the VID code is valid, ISL6312A will initiate the second soft-start ramp until the output voltage reaches the VID voltage plus/minus any offset or droop voltage ...

Page 23

... TDC. The typical value for TDC can range between 1.5ms and 3.0ms. TD5 Pre-Biased Soft-Start The ISL6312A also has the ability to start up into a pre-charged output, without causing any unnecessary disturbance. The FB pin is monitored during soft-start, and should it be higher than the equivalent internal ramping (EQ ...

Page 24

... VID transition, until 50μs after the internal DAC reaches the final VID setting. This is the only time during operation of the ISL6312A that the OVP circuitry is not active. Pre-POR Overvoltage Protection Prior to PVCC and VCC exceeding their POR levels, the ISL6312A is designed to protect the load from any overvoltage events that may occur ...

Page 25

... VSEN and RGND will increase until an overvoltage event occurs, at which point overvoltage protection activates and the controller stops regulating. The ISL6312A will be latched off and cannot be restarted until the controller is reset. Overcurrent Protection The ISL6312A takes advantage of the proportionality between the load current and the average current, I detect an overcurrent condition ...

Page 26

... Individual Channel Overcurrent Limiting The ISL6312A has the ability to limit the current in each individual channel without shutting down the entire regulator. This is accomplished by continuously comparing the sensed currents of each channel with a constant 170μA OCL reference current as shown in Figure 14 channel’s individual sensed ...

Page 27

... QFN package is approximately 3.5W at room temperature. See Layout Considerations paragraph for thermal transfer improvement suggestions. When designing the ISL6312A into an application recommended that the following calculation is used to ensure safe operation at the desired frequency for the selected MOSFETs. The total gate drive power losses, P the gate charge of MOSFETs and the integrated driver’ ...

Page 28

... Inductor DCR Current Sensing Component Selection The ISL6312A senses each individual channel’s inductor current by detecting the voltage across the output inductor DCR of that channel (As described in the “Continuous Current Sampling” on page 12). As Figure 18 illustrates, an R-C network is required to accurately sense the inductor DCR voltage and convert this information into a current, which is proportional to the total output current ...

Page 29

... OCP ⎛ ⎞ ⋅ > 600 ⋅ ⎜ ⎟ ------------------------------- - -------------------- - = OCP OCP min ⋅ DCR I ⎝ R ⎠ OCP 2 and (OPTIONAL COMP VDIFF LOAD-LINE REGULATED ISL6312A CIRCUIT is being used, 1 (EQ. 42 (EQ. 43) ISL6312A . 0 0 FN9290.3 August 1, 2007 ...

Page 30

... ISL6312A In high-speed converters, the output capacitor bank is usually the most costly (and often the largest) part of the circuit. Output filter design begins with minimizing the cost of this part ⋅ ...

Page 31

... The input capacitors are responsible for sourcing the AC component of the input current flowing into the upper MOSFETs. Their RMS current capacity must be sufficient to handle the AC component of the current drawn by the upper MOSFETs which is related to duty cycle and the number of active phases. 31 ISL6312A 0.3 0.2 (EQ. 47) 0.1 ⎞ (EQ. 48) ...

Page 32

... The critical small components include the bypass capacitors for VCC and PVCC, and many of the components surrounding the controller including the feedback network and current sense components. Locate the VCC/PVCC bypass capacitors as close to the ISL6312A as possible 0.8 1.0 especially important to locate the components associated ...

Page 33

... VID1 VID0 VRSEL PGOOD +12V R EN1 EN R EN2 DRSEL R DR IOUT R IOUT GND FIGURE 25. PRINTED CIRCUIT BOARD POWER PLANES AND ISLANDS 33 ISL6312A LOCATE CLOSE TO IC (MINIMIZE CONNECTION PATH) +12V C BIN1 C BOOT1 BOOT1 UGATE1 PHASE1 LGATE1 ISEN1- ISEN1+ +12V PVCC1_2 (CF2) C BIN2 ...

Page 34

... Thermal Management For maximum thermal performance in high current, high switching frequency applications, connecting the thermal GND pad of the ISL6312A to the ground plane with multiple vias is recommended. This heat spreading allows the part to achieve its full thermal potential also recommended that the controller be placed in a direct path of airflow if possible to help thermally manage the part ...

Page 35

... L48.7x7 48 LEAD QUAD FLAT NO-LEAD PLASTIC PACKAGE Rev 4, 10/06 7.00 6 PIN 1 INDEX AREA (4X) 0.15 TOP VIEW ( TYP ) ( TYPICAL RECOMMENDED LAND PATTERN 35 ISL6312A 4X 5.5 A 44X 0. 48X 0 . 40± BOTTOM VIEW ± SIDE VIEW ( 44X REF C ( 48X 0 ...

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