microprocessors. The integration of power MOSFET drivers
into the controller IC marks a departure from the separate
PWM controller and driver configuration of previous multi-
phase product families. By reducing the number of external
parts, this integration is optimized for a cost and space
saving power management solution.
Outstanding features of this controller IC include
programmable VID codes compatible with Intel
VRM9,VRM10, as well as AMD Hammer microprocessors. 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.
A unique feature of the ISL6568 is the combined use of both
DCR and r
DS(ON)
current sensing. Load line voltage
positioning (droop) and overcurrent protection are
accomplished through continuous inductor DCR current
sensing, while r
DS(ON)
current sensing is used for accurate
channel-current balance. Using both methods of current
sampling utilizes the best advantages of each technique.
Protection features of this controller IC include a set of
sophisticated overvoltage, undervoltage, and overcurrent
protection. Overvoltage results in the converter turning the
lower MOSFETs ON to clamp the rising output voltage and
protect the microprocessor. The overcurrent protection level
is set through a single external resistor. Furthermore, the
ISL6568 includes protection against an open circuit on the
remote sensing inputs. Combined, these features provide
advanced protection for the microprocessor and power
system.
Features
• Integrated Multi-Phase Power Conversion
- 1 or 2-Phase Operation
• Precision Core Voltage Regulation
- Differential Remote Voltage Sensing
-
±0.5%
System Accuracy Over Temperature
- Adjustable Reference-Voltage Offset
• Precision Channel Current Sharing
- Uses Loss-Less r
DS(ON)
Current Sampling
• Accurate Load Line Programming
- Uses Loss-Less Inductor DCR Current Sampling
• Variable Gate Drive Bias: 5V to 12V
• Microprocessor Voltage Identification Inputs
- Up to a 6-Bit DAC
- Selectable between Intel’s VRM9, VRM10, or AMD
Hammer DAC codes
- Dynamic VID-on-the-fly Technology
• Overcurrent Protection
• Multi-tiered Overvoltage Protection
• Digital Soft-Start
• Selectable Operation Frequency up to 1.5MHz Per Phase
• Pb-Free Plus Anneal Available (RoHS Compliant)
Pinout
ISL6568 (QFN)
TOP VIEW
UGATE1
25
24
23
22
33
GND
21
20
19
18
17
9
VSEN
10
OCSET
11
ICOMP
12
ISUM
13
IREF
14
LGATE2
15
PVCC
16
ISEN2
BOOT1
PHASE1
VID4
VID3
ENLL
PHASE2
BOOT2
UGATE2
LGATE1
27
PGOOD
ISEN1
26
VID0
VID1
VID2
30
32
VID12.5
REF
OFS
VCC
COMP
FB
VDIFF
RGND
1
2
3
4
5
6
7
8
31
FS
29
28
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774
|
Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2004-2006. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
ISL6568
Ordering Information
PART NUMBER*
ISL6568CRR5184
ISL6568CR-TR5184
ISL6568CRZR5184
ISL6568CRZ-TR5184
ISL6568CRZAR5184
ISL6568CRZA-TR5184
ISL6568IR
ISL6568IR-T
ISL6568IRZ
ISL6568IRZ-T
ISL6568IRZA
ISL6568IRZA-T
PART
MARKING
ISL6568CR
ISL6568CR
ISL6568CRZ
ISL6568CRZ
ISL6568CRZ
ISL6568CRZ
ISL6568IR
ISL6568IR
ISL6568IRZ
ISL6568IRZ
ISL6568IRZ
ISL6568IRZ
TEMP.
(°C)
0 to 70
0 to 70
0 to 70
0 to 70
0 to 70
0 to 70
-40 to 85
-40 to 85
-40 to 85
-40 to 85
-40 to 85
-40 to 85
32 Ld 5x5 QFN
32 Ld 5x5 QFN (Pb-free) Tape and Reel
32 Ld 5x5 QFN (Pb-free)
32 Ld 5x5 QFN (Pb-free) Tape and Reel
32 Ld 5x5 QFN (Pb-free)
32 Ld 5x5 QFN (Pb-free) Tape and Reel
32 Ld 5x5 QFN
32 Ld 5x5 QFN Tape and Reel
32 Ld 5x5 QFN (Pb-free)
32 Ld 5x5 QFN (Pb-free) Tape and Reel
32 Ld 5x5 QFN (Pb-free)
32 Ld 5x5 QFN (Pb-free) Tape and Reel
PACKAGE
PKG.
DWG. #
L32.5x5
L32.5x5
L32.5x5
L32.5x5
L32.5x5
L32.5x5
L32.5x5
L32.5x5
L32.5x5
L32.5x5
L32.5x5
L32.5x5
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.
2
FN9187.4
March 9, 2006
ISL6568
Block Diagram
ICOMP OCSET
PGOOD
ENLL
ISEN AMP
ISUM
IREF
100µA
OC
0.66V
POWER-ON
RESET
VCC
PVCC
RGND
VSEN
+1V
SOFT START
x1
x1
AND
FAULT LOGIC
GATE
CONTROL
LOGIC
UVP
0.2V
OVP
CLOCK AND
SAWTOOTH
GENERATOR
OVP
V
OVP
SHOOT-
THROUGH
PROTECTION
BOOT1
UGATE1
VDIFF
PHASE1
LGATE1
FS
∑
PWM1
BOOT2
UGATE2
+150mV
x 0.82
GATE
CONTROL
LOGIC
SHOOT-
THROUGH
PROTECTION
PHASE2
VID4
VID3
VID2
VID1
VID0
VID12.5
DYNAMIC
VID
D/A
∑
PWM2
LGATE2
PHASE 2
DETECT
CHANNEL
CURRENT
BALANCE
1
N
REF
FB
E/A
COMP
∑
OFFSET
OFS
CHANNEL
CURRENT
SENSE
ISEN1 ISEN2
GND
3
FN9187.4
March 9, 2006
ISL6568
Typical Application - ISL6568
VDIFF
FB
COMP
VSEN
RGND
+5V
PVCC1
VCC
+12V
BOOT1
OFS
UGATE1
PHASE1
ISEN1
FS
REF
LGATE1
VID4
VID3
VID2
VID1
VID0
VID12.5
ISL6568
+12V
PVCC2
LOAD
BOOT2
UGATE2
PGOOD
PHASE2
ISEN2
+12V
GND
LGATE2
ENLL
IREF
OCSET
ICOMP
ISUM
4
FN9187.4
March 9, 2006
ISL6568
Typical Application - ISL6568 with NTC Thermal Compensation
