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PDF ISL6247 Data sheet ( Hoja de datos )
| Número de pieza | ISL6247 | |
| Descripción | A Mobile Multi-Phase PWM Controller | |
| Fabricantes | Intersil Corporation | |
| Logotipo |  |
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®
CONFIDENTIAL
Data Sheet
June 2003
ISL6247
FN9113
A Mobile Multi-Phase PWM Controller with
Precision Current Sensing
The ISL6247 provides microprocessor core-voltage
regulation by driving up to four interleaved synchronous-
rectified buck-converter channels in parallel. Multi-phase
buck converter architecture uses interleaved timing to
multiply ripple frequency and reduce input and output ripple
currents. The reduction in ripple results in fewer
components, lower component cost, reduced power
dissipation, and smaller implementation area. The ISL6247
multi-phase controller together with ISL6207 gate drivers
forms the basis for a portable power supply solution to power
Intel’s next generation mobile microprocessors.
Intel Mobile Voltage Positioning (IMVP) is a smart voltage
regulation technology which effectively reduces power
dissipation in Intel® Pentium® Processors. The ISL6247
supports the IMVP-5 mobile processor voltage regulation
specifications. To boost battery life, the ISL6247 operates in
Active, Deep Sleep, or Deeper Sleep modes, depending
upon the logic levels at the DSEN# and DRSEN pins. A 6-bit
digital-to-analog converter (DAC) allows dynamic adjustment
of the core output voltage from 0.8375V to 1.6V. The
controller features a thermal monitor which sends a signal to
the microprocessor to reduce the load before power system
components exceed their maximum thermal limits, reducing
the thermal design complexity and overall core-voltage
regulation cost.
To improve efficiency, the ISL6247 allows users to select one
of two popular lossless current sense techniques. The
ISL6247 supports detection via inductor coil resistance
(DCR), or the rDS(ON) of the lower MOSFET. Either cost and
space-saving method provides feedback for precision droop,
channel current balancing, and individual channel
over-current protection. A unity gain, differential amplifier is
provided for remote voltage sensing. The differential
amplifier eliminates errors due to potential differences
between remote and local grounds. Eliminating ground
differences improves regulation and protection accuracy.
The channel switching frequency is adjustable in the range
of 200kHz to 1.0MHz, providing flexibility in managing the
balance between high-speed response, target efficiency, and
good thermal management.
Ordering Information
PART NUMBER TEMP. (oC) PACKAGE PKG. DWG. #
ISL6247CR
-10 to 100 40 Ld 6x6 QFN L40.6X6
ISL6247CR-T 40 Lead 6x6 QFN Tape and Reel
Lead-Free Packaging (Pb Free)
ISL6247CRZ
-10 to 100 40 Ld 6x6 QFN L40.6X6
ISL6247CRZ-T 40 Lead 6x6 QFN Tape and Reel
Features
• Precision Multi-Phase Core Voltage Regulation
- ±0.6% System Accuracy Over Temperature
• Microprocessor Voltage Identification Input
- 6-Bit VID Input
- 0.8375V to 1.600V in 12.5mV Steps
- Supports VID Changes During Operation
• Multiple Current Sensing Approaches Supported
- Lossless DCR Current Sensing
- Precision Resistive Current Sensing
- Low Cost RDS(on) Current Sensing
• Excellent Dynamic Response
- Combined Input Voltage Feed-Forward and Pulse-by-
Pulse Average Current Mode
• DSEN# and DRSEN Logic Inputs for Low Power States
• DSV Voltage Input for DEEP SLEEP Mode
• DRSV Voltage Input for DEEPER SLEEP Mode
• Thermal Monitor
• Active Channel Current Balancing
• Differential Remote Voltage Sensing
• Individual Channel Over-Current, Over-Voltage, and
Under-Voltage Protection
• 2, 3, or 4-Phase Operation
• User selectable Switching Frequency of 200K - 1.0MHz
- 400kHz - 4MHz Effective Ripple Frequency
• QFN Package Option
- QFN Compliant to JEDEC PUB95 MO-220 QFN - Quad
Flat No Leads - Product Outline
- QFN Near Chip Scale Package Footprint; Improves
PCB Efficiency, Thinner in Profile
Applications
• Notebook Computer IMVP-5 DC/DC converter
Pinout
ISL6247CR (40 LD QFN 6X6)
TOP VIEW
40 39 38 37 36 35 34 33 32 31
VID4 1
VID3 2
VID2
VID1
3
4
VID0 5
VID5 6
RAMPADJ 7
OFS
DSV
8
9
OCSET 10
GND PAD
[BOTTOM]
30 ISEN4+
29 ISEN4-
28 ISEN2-
27 ISEN2+
26 PWM2
25 PWM1
24 ISEN1+
23 ISEN1-
22 ISEN3-
21 ISEN3+
11 12 13 14 15 16 17 18 19 20
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2003. All Rights Reserved..
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL6247
FIGURE 7. SOFT START WAVEFORM
FIGURE 8. INRUSH CURRENT AT VIN 10.8V @ 80A
FIGURE 9. INRUSH CURRENT AT VIN 19V @ 80A
FIGURE 10. FOUR PHASE CURRENT BALANCE @ 80A
FIGURE 11. THREE PHASE CURRENT BALANCE @ 60A
FIGURE 12. VID CHANGE FROM 1.350V TO 1.150V
5
5 Page 
ISL6247
Theory of Operation
Multi-Phase Power Conversion
Microprocessor load current profiles have advanced to a
point where single-phase converter solutions face arduous
thermal and cost hurdles. Although its greater complexity
presents additional technical challenges, multi-phase power
conversion offers cost-saving advantages with improved
response time, superior ripple cancellation, and excellent
thermal distribution. The ISL6247 controller helps reduce the
complexity of implementation by integrating vital functions
and requiring minimal output components. The block
diagram in Figure 19 provides a top level view of multi-phase
power conversion using the ISL6247 controller.
Interleaving
The switching of each channel in a multi-phase converter is
timed to be symmetrically out of phase with each of the other
channels. In a 4-phase converter, each channel switches 1/4
cycle after the previous channel and 1/4 cycle before the
following channel.
C2
FB R1 C1
RFB
R2 C3
COMP
VDIFF
As a result, the four-phase converter has a combined ripple
frequency four times greater than the switching frequency of
any one phase. In addition, the peak-to-peak amplitude of
the combined inductor currents is reduced in proportion to
the number of phases (Equations 1 and 2). The increased
ripple frequency and lower ripple amplitude, relative to a
single phase approach, results in less per-channel
inductance and lower total output capacitance required to
meet any performance specification.
Figure 20 illustrates the multiplicative effect of a 3-channel
multiphase converter on output ripple frequency. The three
channel currents (IL1, IL2, and IL3), combine to form the AC
ripple current and the DC load current. The ripple
component has three times the ripple frequency of each
individual channel current. Each PWM pulse is terminated
1/3 of a cycle after the PWM pulse of the previous phase. The
peak-to-peak current waveform for each phase is about one
division, and the dc components of the inductor currents
combine to feed the load.
VRTN
-
x1
+
VSEN
REFERENCE
MUX
VID,DSV,DRSV
+
+
∑
-
- VCOMP
ERROR
AMPLIFIER
CURRENT
BALANCE
CORRECTION
SIGNAL
PWM3
VCC
CHANNEL
DETECT
PWM4
OPEN
IDROOP
Σ-4-
+
∑
-
CURRENT
BALANCE
PWM
CIRCUIT
PWM
CIRCUIT
CURRENT
SENSE
CURRENT
SENSE
PWM1
HIP6207
Q1
Q2
PWM2
HIP6207
VIN
Q3
Q4
ISEN2-
ISEN2+
ISEN1-
ISEN1+
RSEN1 (PTC)
RSEN2 (PTC)
L01
L02
VOUT
COUT
FIGURE 19. SIMPLIFIED BLOCK DIAGRAM OF THE ISL6247 IN A 2-PHASE CONVERTER WITH DCR CURRENT SENSING
11
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet ISL6247.PDF ] | |
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