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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.

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ISL6247
Absolute Maximum Ratings
Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+7V
Input, Output, or I/O Voltage . . . . . . . . . . GND -0.3V to VCC + 0.3V
ESD Classification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Class 2
Operating Conditions
Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +5V ±5%
Ambient Temperature. . . . . . . . . . . . . . . . . . . . . . . . -10oC to 100oC
Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . -10oC to 125oC
Thermal Information
Thermal Resistance (Typical, Note 1)
θJA (oC/W) θJA (oC/W)
QFN Package . . . . . . . . . . . . . . . . .
32
3.5
Maximum Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . 150oC
Maximum Storage Temperature Range . . . . . . . . . . -65oC to 150oC
Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . . 300oC
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.
NOTE:
1. 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 for details.
2. θJC, the “case temperature” location is the center of the exposed metal pad on the package underside. See Tech Brief TB379 for details.
Electrical Specifications Operating Conditions: VCC = 5V, TA = -10oC to 85oC. Unless Otherwise Specified.
PARAMETER
TEST CONDITIONS
MIN
INPUT SUPPLY POWER
Operating Current
Shutdown Current
POR (Power-On Reset) Threshold
RFS = 90.9K; ENLL = 1V
RFS = GND; ENLL = 0V
VCC Rising; FB = 0V
-
-
4.20
VCC Falling; FB = 0V
3.65
ENABLE INPUT (ENLL)
Enable Threshold
0.5
High State Leakage Current
ENLL = 1.0V
-
Low State Leakage Current
ENLL = 0.0V
-
REFERENCE VOLTAGE AND DAC
System Accuracy
25ºC
-0.5
VID Input Threshold Voltage
VDAC = 1.1000V to 1.6000V
VDAC = 0.8375V to 1.0875V
-0.6
-0.7
0.4
VID Current
OSCILLATOR
VIDX = 0.0V
VIDX = 1.0V
-
0
Accuracy
Adjustment Range
RFS = 90.9k±1%
270
200
Sawtooth Ramp Amplitude
Duty-Cycle Range
VRAMPADJ = 1.8V
-
0
FS Output Voltage
ERROR AMPLIFIER
RFS = 90.9k±1%
1.223
Open-Loop Gain
Open-Loop Bandwidth
Slew Rate
Maximum Output Voltage
Minimum Output Voltage
Output Sourcing Current
Output Sinking Current
Input Offset
RL = 10kto Ground
CL = 100pF, RL = 10kto Ground
CL = 100pF, RL = 10kto Ground
FB = GND; VDAC = 1.1V; RL = 10kto Ground
FB = 1.2; VDAC = 1.1V; Sinking 300µA
VCOMP = 2V; FB = 0.75V; VDAC = 1V
VCOMP = 1V; FB = 1.25; VDAC = 1V
FB = 1V; OFS = OPEN
-
-
-
3.6
-
0.82
1.2
-
TYP
12
12
4.35
3.80
0.6
-200
49
-
-
-
0.6
47
-1.5
300
1.0
-
1.235
72
18
5.3
4.2
0.2
2.1
1.6
0
MAX
17
17
4.50
3.95
0.7
-
-
+0.5
+0.6
+0.7
0.8
-
-10
330
1000
-
66
1.247
-
-
-
-
-
-
-
-
UNITS
mA
mA
V
V
V
nA
µA
%VID
%VID
%VID
V
µA
µA
kHz
kHz
V
%
V
dB
MHz
V/µs
V
V
mA
mA
mV
2

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ISL6247
Electrical Specifications Operating Conditions: VCC = 5V, TA = -10oC to 85oC. Unless Otherwise Specified. (Continued)
PARAMETER
TEST CONDITIONS
MIN TYP MAX
PIN-ADJUSTABLE OFFSET
OFS Voltage
PWM
IOFS = -20µA; Respect to GND
IOFS = 20µA; Respect to VCC
- 0.5 -
- -2 -
PWM High State
PWM Low State
PWM Three-State
IPWM = -2.5mA
IPWM = +5mA
PWM = 2.5V
- 4.5
- 0.7
-1 -
-
-
1
DIFFERENTIAL SENSE AMPLIFIER
Bandwidth
- 20 -
Slew Rate
-6-
Input Offset
VSEN = 1.6V; VRTN = 0.005V;
-2-
Input Bias Current
VSEN = 1.2V
-100 -
100
Pull-Down Current
VSEN = 0.6V; VDIFF = 0.7V
- 800 -
Output Impedance
- 30 -
CURRENT SENSE AMPLIFIERS
Input Offset
[(ISEN+) - (ISEN-)]
-5 - 5
ISEN Accuracy
SOFT START
ISEN1=ISEN2=ISEN3=ISEN4=50µA
-8 -
8
Initial Soft-Start Current
SOFT < 0.5V
- 25 -
SOFT Slew Current
SOFT > 0.5V
- 500 -
Deeper Sleep Slew Current (Entering Only) SOFT = 1V; DSEN = 0V; DRSEN = 2V
- 100 -
POWER GOOD AND PROTECTION MONITORS
PGOOD Low Voltage
PGOOD Leakage Current
IPGOOD = -4mA; ENLL = GND
PGOOD = 5V
- 0.18 0.40
-1 0
1
Under-Voltage Threshold
VSEN Rising
- 90 -
VSEN Falling
84 86 88
Over-Voltage Threshold
(VID + OV Threshold)
170 200 230
OCSET Voltage Accuracy
ISEN Over-Current Trip Level
INPUT LEAKAGE CURRENT
VDAC = 1.325V
ROCSET = 13.25kΩ; VDAC = 1.325V
- 1.325 -
- -77 -
FB
ISEN1=ISEN2=ISEN3=ISEN4 = 0µA; OFS open
- 50 -
DSV, DRSV
- 50 -
RAMPADJ
RAMADJ = 1.8V
- 100 -
SLEEP STATE THRESHOLDS
Deep Sleep Enable Threshold
DSEN# Rising
1.7 -
-
DSEN# Falling
- - 1.05
Deeper Sleep Enable Threshold
DRSEN Rising
1.7 -
-
DRSEN Falling
- - 1.05
DEEP AND DEEPER SLEEP VOLTAGE
DSV Accuracy
DRSV Accuracy
THERMAL MONITOR
(VOUT - DSV); DSV = 1.2V
(VOUT - DRSV); DRSV = 0.75V
-15 - +15
-15 - +15
NTC Source Current
NTC = 0.6V
34 40 47
Over-Temperature Threshold
V (NTC) Falling
VR-TT# On-Resistance
VR-TT# Sinking Current
NTC < 0.5V; VR-TT# = -4mA; TA = 25oC
VR-TT# Voltage = 0.2V;TA = 85oC
NOTE: Differential and Error Amp of offsets are trimmed out for system accuracy.
0.485 0.5 0.525
- 12 -
13 - 17.5
UNITS
V
V
V
V
µA
MHz
V/µs
mV
nA
µA
mV
%
µA
µA
µA
V
µA
%VID
%VID
mV
V
µA
nA
nA
nA
V
V
V
V
mV
mV
µA
V
mA
3

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Typical Operating Performance
ISL6247
1.35
1.33
1.31
1.29
1.27
1.25
1.23
1.21
1.19
0
ISISLL662477AACcTtIiVvEe MMOoDdEeLLOoAaDdLLINinEe
Vmax Vmin Vnom Vin = 19V Vin = 10.8V
10 20 30 40 50 60 70 80
OUOTuPtpUuTt CCUuRrrRenEtN(TA)(A)
FIGURE 1. ACTIVE LOAD LINE
ISISLL66224477DDEeEePpSSLlEeEePp LLOoAadD LiInNeE
Vmax Vmin Vnom Vin=19V Vin = 10.8V
1.34
1.33
1.32
1.31
1.3
1.29
1.28
1.27
1.26
1.25
1.24
0
5 10 15 20
OUOTuPtpUuTt CCUurRrRenEtNT
25
FIGURE 2. DEEP SLEEP LOAD LINE
IISSLL66224477DDEEePepEeRrSSLlEeEePp LLOoAadD LIiNnEe
Vmax Vmin Vnom Vin =19V Vin =10.8V
0.85
0.84
0.83
0.82
0.81
0.8
0.79
0.78
0.77
0.76
0.75
0.74
012345678
OOUuTtPpUutTCCuUrrReRnEt NT
FIGURE 3. DEEPER SLEEP LOAD LINE
100.00%
ISLIS6L2642747AACcTtiIvVeEMModOeDEEffiEcFieFnIcCyIENCY
Vin = 19V Vin = 14.4V Vin = 10.8V
Vin = 8.4V
90.00%
80.00%
70.00%
60.00%
50.00%
0
10 20 30 40 50 60 70 80
OUOTuPtpUuTt CCUuRrrRenEtNT
FIGURE 4. ACTIVE EFFICIENCY
100.00%
ISLIS6L2642747DDEeEePp SSlLeEepEEPffEicFieFnIcCyIENCY
Vin = 19V Vin = 14.4V Vin = 10.8V
Vin = 8.4V
90.00%
80.00%
70.00%
60.00%
50.00%
0
5 10 15 20
OUOTuPtUpuTtCCUuRrrRenEtNT
FIGURE 5. DEEP SLEEP EFFICIENCY
25
100.00%
ISISLL66224747DDEEeePpEeRrSSLleEeEpP EEfFfiFcIiCeInEcNyCY
Vin = 19V Vin = 14.4V Vin = 10.8V
Vin = 8.4V
90.00%
80.00%
70.00%
60.00%
50.00%
0123456
OUTOPuUtpTuCt CUuRrRreEnNtT
FIGURE 6. DEEPER SLEEP EFFICIENCY
7
8
4

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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