isl6307b Intersil Corporation, isl6307b Datasheet

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isl6307b

Manufacturer Part Number
isl6307b
Description
6-phase Vr11 Pwm Controller With 8-bit Vid Code Capable Of Precision Rds On Or Dcr Differential Current Sensing For Applications In Which Supply Voltage Is Higher Than 5v
Manufacturer
Intersil Corporation
Datasheet

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Part Number:
isl6307bCRZ
Manufacturer:
INTERSIL
Quantity:
20 000
Part Number:
isl6307bCRZ-T
Manufacturer:
INTERSIL
Quantity:
20 000
6-Phase VR11 PWM Controller with 8-Bit
VID Code Capable of Precision R
DCR Differential Current Sensing for
Applications in Which Supply Voltage is
Higher than 5V
The ISL6307B controls microprocessor core voltage
regulation by driving up to 6 synchronous-rectified buck
channels in parallel. Multiphase buck converter architecture
uses interleaved timing to multiply channel ripple frequency
and reduce input and output ripple currents. Lower ripple
results in fewer components, lower component cost, reduced
power dissipation, and smaller implementation area.
Microprocessor loads can generate load transients with
extremely fast edge rates. The ISL6307B features a high
bandwidth control loop and ripple frequencies up to 6MHz to
provide optimal response to the transients.
Today’s microprocessors require a tightly regulated output
voltage position versus load current (droop). The ISL6307B
senses current by utilizing patented techniques to measure
the voltage across the on resistance, R
MOSFETs or DCR, of the output inductor during the lower
MOSFET conduction intervals. Current sensing provides the
needed signals for precision droop, channel-current
balancing, and overcurrent protection. A programmable
internal temperature compensation function is implemented
to effectively compensate for the temperature coefficient of
the current sense element.
A unity gain, differential amplifier is provided for remote
voltage sensing. Any potential difference between remote
and local grounds can be completely eliminated using the
remote-sense amplifier. Eliminating ground differences
improves regulation and protection accuracy. The threshold-
sensitive enable input is available to accurately coordinate
the start up of the ISL6307B with any other voltage rail.
Dynamic-VID™ technology allows seamless on-the-fly VID
changes. The offset pin allows accurate voltage offset
settings that are independent of VID setting.
Ordering Information
Add “-T” suffix for tape and reel.
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.
ISL6307BCRZ (Note)
ISL6307BIRZ (Note)
PART NUMBER
-40 to 85 48 Ld 7x7 QFN (Pb-free) L48.7x7
0 to 70 48 Ld 7x7 QFN (Pb-free) L48.7x7
TEMP.
(°C)
®
1
PACKAGE
Data Sheet
DS(ON)
, of the lower
DS(ON)
Dynamic VID™ is a trademark of Intersil Americas Inc. Copyright © Intersil Americas Inc. 2006. All Rights Reserved
DWG. #
PKG.
1-888-INTERSIL or 1-888-468-3774
or
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Features
• Precision multiphase Core Voltage Regulation
• Precision R
• Microprocessor Voltage Identification Input
• Threshold-sensitive Enable Function for Power
• Thermal Monitoring
• Internal 5V Shunt Regulator
• Programmable Temperature Compensation
• Overcurrent Protection
• Overvoltage Protection with OVP Output Indication
• 2, 3, 4, 5 or 6 Phase Operation
• Adjustable Switching Frequency up to 1MHz Per Phase
• QFN Package Option
• Pb-Free Plus Anneal Available (RoHS Compliant)
- Differential Remote Voltage Sensing
- ±0.5% System Accuracy Over Life, Load, Line and
- Adjustable Precision Reference-Voltage Offset
- Accurate Load-Line Programming
- Accurate Channel-Current Balancing
- Differential Current Sense
- Dynamic VID™ Technology
- 8-Bit VID Input with Selectable VR11 Code and
- 0.5V to 1.600V operation range
Sequencing and VTT Enable
- QFN Compliant to JEDEC PUB95 MO-220 QFN - Quad
- QFN Near Chip Scale Package Footprint; Improves
Temperature
Extended VR10 Code at 6.25mV Step
Flat No Leads - Product Outline
PCB Efficiency, Thinner in Profile
All other trademarks mentioned are the property of their respective owners.
March 9, 2006
|
Intersil (and design) is a registered trademark of Intersil Americas Inc.
DS(ON)
or DCR Current Sensing
ISL6307B
FN9225.0

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isl6307b Summary of contents

Page 1

... Eliminating ground differences improves regulation and protection accuracy. The threshold- sensitive enable input is available to accurately coordinate the start up of the ISL6307B with any other voltage rail. Dynamic-VID™ technology allows seamless on-the-fly VID changes. The offset pin allows accurate voltage offset settings that are independent of VID setting ...

Page 2

... Pinout 1 VID7 2 VID6 3 VID5 4 VID4 5 VID3 6 VID2 7 VID1 8 VID0 9 VRSEL 10 OFS 11 IOUT 12 DAC 2 ISL6307B ISL6307B (48 LD QFN) TOP VIEW GND PWM3 35 ISEN3+ 34 ISEN3- 33 ISEN1- 32 ISEN1+ 31 PWM1 30 PWM4 29 ISEN4+ 28 ISEN4- 27 ISEN2- 26 ISEN2+ ...

Page 3

... ISL6307B Block Diagram VDIFF VR_RDY RGND x1 VSEN OVP SOFT-START +200mV FAULT LOGIC SS OFS OFFSET REF DAC VRSEL VID7 VID6 VID5 DYNAMIC VID4 VID D/A VID3 VID2 VID1 VID0 COMP FB 2V OC2 IOUT IDROOP GND 3 ISL6307B VCC OVP SHUNT REGULATOR OVP R S DRIVE ...

Page 4

... R IOUT PWM3 ISEN3- ISEN3+ VR_FAN PWM5 ISEN5- VR_HOT ISEN5+ TM EN_PWR TCOMP OFS OFS +12V NTC 4 ISL6307B DS(ON) +12V VCC PVCC ISL6612 DRIVER PWM GND +12V VCC +12V 300Ω ISL6612 PVCC DRIVER PWM GND +12V VCC ISL6612 PVCC ...

Page 5

... PWM3 ISEN3- ISEN3+ VR_FAN PWM5 ISEN5- VR_HOT ISEN5+ TM EN_PWR TCOMP OFS FS SS +5V +5V R OFS +12V NTC 5 ISL6307B DS(ON) +12V VCC PVCC ISL6612 DRIVER PWM GND +12V VCC +12V 300Ω ISL6612 PVCC DRIVER PWM GND +12V VCC ISL6612 PVCC DRIVER ...

Page 6

... PWM3 ISEN3- ISEN3+ VR_FAN PWM5 ISEN5- VR_HOT ISEN5+ TM EN_PWR TCOMP OFS OFS R T +12V NTC 6 ISL6307B +12V VCC ISL6612 PVCC DRIVER PWM GND +12V VCC +12V 300Ω ISL6612 PVCC DRIVER PWM GND +12V VCC ISL6612 PVCC DRIVER ...

Page 7

... ISEN1+ PWM3 ISEN3- ISEN3+ VR_FAN PWM5 ISEN5- VR_HOT ISEN5+ TM EN_PWR OFS FS TCOMP SS +5V +5V R OFS +12V NTC 7 ISL6307B +12V VCC PVCC ISL6612 DRIVER PWM GND +12V VCC 300Ω ISL6612 PVCC DRIVER PWM GND +5V VCC EN ISL6612 DRIVER PWM GND ...

Page 8

... ESD (Charged device model . . . . . . . . . . . . . . . . . . . . . . . . . >1.5kV Operating Conditions Voltage at VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +5V ±5% Ambient Temperature (ISL6307BCRZ 0°C to 70°C Ambient Temperature (ISL6307BIRZ .-40°C to 85°C CAUTION: Stress above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied ...

Page 9

... Electrical Specifications Operating Conditions: VCC = 5V or ICC < 25mA (Note 3). Unless Otherwise Specified (Continued) PARAMETER PIN-ADJUSTABLE OFFSET Voltage at OFS Pin for ISL6307BCRZ Voltage at OFS Pin for ISL6307BIRZ OSCILLATORS Accuracy of Switching Frequency Setting Adjustment Range of Switching Frequency (Note 4) Soft-start Ramp Rate (Notes 5, 6) ...

Page 10

... When EN_VTT is driven above 0.875V, the ISL6307B is active depending on status of ENLL, the internal POR, and pending fault states. Driving EN_VTT below 0.745V will clear all fault states and prime the ISL6307B to soft-start when re- enabled Use this pin to set up the desired switching frequency. A resistor, placed from FS to ground will set the switching frequency ...

Page 11

... The Voltage at IOUT pin will be proportional to the load current. If the voltage is higher than . ISEN 2V, ISL6307B will go into OCP mode, this means shut down first and then hiccup. The additional OCP trip level can be adjusted by changing the resistor value input pin for VR temperature measurement. ...

Page 12

... OUT voltages respectively the single-channel inductor value, and f is the switching frequency ISL6307B INPUT-CAPACITOR CURRENT, 10A/DIV IL2, 7A/DIV FIGURE 2. CHANNEL INPUT CURRENTS AND INPUT- The output capacitors conduct the ripple component of the inductor current. In the case of multiphase converters, the capacitor current is the sum of the ripple currents from each of the individual channels ...

Page 13

... PWM Operation The timing of each converter leg is set by the number of active channels. The default channel setting for the ISL6307B is four. One switching cycle is defined as the time between PWM1 pulse termination signals. The pulse termination signal is an internally generated clock signal which triggers the falling edge of PWM1. The cycle time of ...

Page 14

... ISEN resulting current out of the ISEN+ pin is proportional to the , is proportional SEN channel current I (EQ. 5) SAMPLE HOLD ISL6307B INTERNAL CIRCUIT FIGURE 6. MOSFET R Equation 7 shows the ratio of the channel current to the (EQ. 6) sensed current I I SEN Both inductor DCR and MOSFET R increase as the temperature increases. Therefore the sensed current will increase as the temperature of the current sense element increases ...

Page 15

... DAC) and offset errors in the OFS current source, remote-sense and error amplifiers. Intersil specifies the guaranteed tolerance of the ISL6307B to include the combined tolerances of each of these elements. The output of the error amplifier, V COMP sawtooth waveform to generate the PWM signals ...

Page 16

... ISL6307B TABLE 1. VR10 VID TABLE (WITH 6.25mV EXTENSION) VID4 VID6 VOLTAGE 400mV 6.25mV ( 1 1.59375 1.5875 1.58125 1.575 1.56875 ...

Page 17

... ISL6307B TABLE 1. VR10 VID TABLE (WITH 6.25mV EXTENSION) VID6 VOLTAGE VID4 6.25mV (V) 400mV 0 1 1.1125 1.10625 1 1.09375 OFF OFF 0 ...

Page 18

... ISL6307B VID7 VID6 VID5 VID4 VID3 VID2 VID1 VID0 VOLTAGE 1 0 1.45000 1.44375 1.43750 1.43125 1.42500 1.41875 1.41250 ...

Page 19

... ISL6307B VID7 VID6 VID5 VID4 VID3 VID2 VID1 VID0 VOLTAGE 1 0 0.95000 0.94375 0.93750 0.93125 0.92500 0.91875 0.91250 ...

Page 20

... DAC range of the processor without discontinuity or disruption is a necessary function of the core-voltage regulator. The ISL6307B checks the VID inputs six times every switching cycle. If the VID code is found to have been changed, the controller waits half of a complete cycle before creates an REF executing a 12 ...

Page 21

... When all conditions above are satisfied, ISL6307B begins the soft-start and ramps the output voltage to 1.1V first. After remaining at 1.1V for some time, ISL6307B reads the VID code at VID input pins. If the VID code is valid, ISL6307B will EXTERNAL CIRCUIT regulate the output to the final VID setting. If the VID code is OFF code, ISL6307B will shut down ...

Page 22

... PWM signals enter a high-impedance state. The Intersil drivers respond to the high-impedance input by turning off both upper and lower MOSFETs. If the overvoltage condition reoccurs, the ISL6307B will again command the lower MOSFETs to turn on. The ISL6307B will continue to protect the load in this fashion as long as the overvoltage condition recurs. - ...

Page 23

... Current Sense Output The ISL6307B has 2 current sense output pins IDROOP and IOUT; they are identical. In typical application, IDROOP pin AVG, is connected to FB pin for the application where load line is required ...

Page 24

... TM voltage is lower than 33% of Vcc voltage, and is pulled to GND when TM voltage increases to above 39% of Vcc voltage. VR_HOT is set to high when TM voltage goes below 28% of Vcc voltage, and is pulled to GND when TM voltage goes back to above 33% of Vcc voltage. Figure 17 shows the operation of those signals. 24 ISL6307B VCC R 0.33V TM1 TM R ...

Page 25

... Integrated Temperature Compensation When TCOMP voltage is equal or greater than Vcc/15, ISL6307B will utilize the voltage at TM and TCOMP pins to compensate the temperature impact on the sensed current. The block diagram of this function is shown in Figure 18. 25 ...

Page 26

... ISL6307B multiplexes the TCOMP factor N with the TM digital signal to obtain the adjustment gain to compensate the temperature impact on the sensed channel current. The compensated channel current signal is used for droop and overcurrent protection functions. Design Procedure: 1. Properly choose the voltage divider for TM pin to match the TM voltage Vs temperature curve with the recommended curve in Figure 16 ...

Page 27

... Once the lower MOSFET begins conducting, the current in the upper MOSFET falls to zero as the current in the lower MOSFET ramps up to assume the full inductor current. In Equation 26, 27 ISL6307B the required time for this commutation is t approximated associated power loss ...

Page 28

... Case 1: Case Case 3: C (OPTIONAL COMP FB + IDROOP DROOP - VDIFF LOAD-LINE REGULATED ISL6307B CIRCUIT , has already been chosen The target 0 1 ------------------- > 2π LC 2π P -------------------------------------- - C FB 0.75V IN ...

Page 29

... IDROOP VDIFF FIGURE 21. COMPENSATION CIRCUIT FOR ISL6307B BASED CONVERTER WITHOUT LOAD-LINE REGULATION In Equation 34 the per-channel filter inductance divided by the number of active channels the sum total of all output capacitors; ESR is the equivalent-series resistance of the bulk output-filter capacitance; and V peak sawtooth signal amplitude as described in Figure 7 and Electrical Specifications ...

Page 30

... ∆I 30 ISL6307B Input Supply Voltage The VCC input of SL6307B needs to be connected to +12V through a 300Ω resistor with one 1µF cap be connected from VCC to GND. Switching Frequency There are a number of variables to consider when choosing the switching frequency, as there are considerable effects on (EQ ...

Page 31

... The result from the high current slew rates produced by the upper MOSFETs turning on and off. Select low ESL ceramic capacitors and place one as close as possible to each upper MOSFET drain to minimize board parasitic impedances and maximize suppression. 31 ISL6307B 0 0.2 0 ...

Page 32

... The ISL6307B can be placed off to one side or centered relative to the individual phase switching components. Routing of sense lines and PWM signals will guide final placement. Critical small signal components to place close to the controller include the ISEN resistors, R feedback resistor, and compensation components ...

Page 33

... However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries. For information regarding Intersil Corporation and its products, see www.intersil.com 33 ISL6307B L48.7x7 48 LEAD QUAD FLAT NO-LEAD PLASTIC PACKAGE (COMPLIANT TO JEDEC MO-220VKKD-2 ISSUE C) ...

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