intersil ISL6571 DATA SHEET
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®
ISL6571
Data Sheet April 18, 2005
Complementary MOSFET Driver and
Synchronous Half-Bridge Switch
The Intersil ISL6571 provides a new approach for
implementing a synchronous rectified buck switching
regulator. The ISL6571 replaces two power MOSFETs, a
Schottky diode, two gate drivers and synchronous control
circuitry. Its main applications address high-density power
conversion circuits including multiphase-topology computer
microprocessor core power regulators, ASIC and memory
array regulators, etc. Another useful feature of the ISL6571
is the compatibility with three-state input control: left open,
the PWM input turns off both output drives. The ISL6571
operates in continuous conduction mode reducing EMI
constraints and enabling high bandwidth operation.
Ordering Information
TEMP.
PART NUMBER
ISL6571CR* 0 to 70 68 Ld 10x10 QFN L68.10x10A
ISL6571CRZ*
(See Note)
ISL6571EVAL1 Evaluation Board
*Add “-T” suffix for tape and reel.
NOTE: Intersil Pb-free 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.
RANGE (°C) PACKAGE
0 to 70 68 Ld 10x10 QFN
(Pb-free)
PKG.
DWG. #
L68.10x10A
FN9082.4
Features
• Improved Performance over Conventional Synchronous
Buck Converter using Discrete Components
• Optimal Deadtime Provided by Adaptive Shoot-Through
• Switching Frequency up to 1MHz
- High-Bandwidth, Fast Transient Response
- Small, Low Profile Converters
• Reduced Connection Parasitics between Discrete
Components
- Low Electromagnetic Emissions
• Low Profile, Low Thermal Impedance Packaging
- High Power Density Applications
• QFN Package:
- Compliant to JEDEC PUB95 MO-220
QFN - Quad Flat No Leads - Package Outline
- Near Chip Scale Package footprint, which improves
PCB efficiency and has a thinner profile
• Pb-Free Available (RoHS Compliant)
Applications
•
Multiphase Power Regulators
•
Low-Voltage Switchmode Power Conversion
• High-Density Power Converters
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-352-6832
| Intersil (and design) is a registered trademark of Intersil Americas Inc.
All other trademarks mentioned are the property of their respective owners.
Copyright Intersil Americas Inc. 2003-2005. All Rights Reserved
ISL6571
Pinout
PHASE
PHASE
PHASE
PHASE
PHASE
PHASE
PHASE
PHASE
PHASE
PHASE
PHASE
PHASE
PHASE
PHASE
PHASE
PHASE
PHASE
PGND
PGND
PGND
PGND
67666564636261
68
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19202122232425
ISL6571 (QFN) TOP VIEW
PGND
PGND
PGND
PGND
PGND
LGATE1
PHASEPHASE
58
59
60
69
PHASE
28
27
26
PVCC
56
NC
55
71
GND
70
VIN
VCC
54
GND
57
2930313233
LGATE
NC
52
53
NC51
50
GND
49
NC
48
PWM
47
BOOT
GND
46
45
PHASE
44
VIN
43
VIN
42
VIN
41
VIN
VIN
40
VIN
39
38
VIN
VIN
37
36
VIN
VIN
35
34
NC
NC
NCNCNC
NC
NC
NC
NC
NC
VIN
VIN
VIN
VIN
VIN
VIN
2
FN9082.4
ISL6571
BOOT
UFET
VIN
DRIVE1
PVCC
PHASE
GATE
PVCC
CONTROL
LGATE
LFET
PGND
LGATE1
DRIVE2
VCC
FIGURE 1. BLOCK DIAGRAM
LOGIC
CONTROL
GND
5V
+
-
POWER-ON
RESET (POR)
10K
PWM
10K
3
FN9082.4
+12VIN
+12VIN
+5VIN
PWM
ISL6571
CONTROL
AND
DRIVERS
ISL6571
FIGURE 2. SIMPLIFIED POWER SYSTEM DIAGRAM
L
IN
C
BOOT
L
OUT
C
OUT
V
OUT
+5VIN
POWER
GOOD
C
+
VCC
PWM
PVCC
BOOT
VIN
U2
ISL6571
GND
PVCC
U3
PHASE
PGND
BOOT
VIN
PHASE
18
17
19
PWM4
ISEN4
PGOOD
20
VCC
PWM1
ISEN1
PWM2
ISEN2
LGATE1
LGATE
15
16
14
13
VCC
PWM
ISL6571
LGATE1
U1
HIP6301
8
FS/DIS
R
FS
PWM3
ISEN3
11
12
LGATE
GND
PGND
IN1
C
BOOT1
L
OUT1
R
SNS1
C
+
IN2
C
BOOT2
L
OUT2
V
OUT
R
SNS2
C
OUT
+
R
OFFSET
COMP
VSEN
10
FB
6
7
C2
C1
R2
VCC
PWM
PVCC
U4
BOOT
VIN
ISL6571
GND
PHASE
PGND
LGATE1
LGATE
R1
5
VID0
4
VID1
3
VID2
2
VID3
1
VID4
GND
9
C
+
IN3
C
BOOT3
L
OUT3
R
SNS3
FIGURE 3. TYPICAL APPLICATION
4
FN9082.4
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