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DROP-IN ENHANCED PRODUCT - ISL6609
ISL6605
FN9091
Rev 7.00
May 9, 2006
Synchronous Rectified MOSFET Driver
The ISL6605 is a high frequency, MOSFET driver optimized
to drive two N-Channel power MOSFETs in a synchronousrectified buck converter topology. This driver combined with
an Intersil HIP63xx or ISL65xx Multi-Phase Buck PWM
controller forms a complete single-stage core-voltage
regulator solution with high efficiency performance at high
switching frequency for advanced microprocessors.
Features
The IC is biased by a single low voltage supply (5V) and
minimizes low driver switching losses for high MOSFET gate
capacitance and high switching frequency applications.
Each driver is capable of driving a 3000pF load with an 8ns
propagation delay and less than 10ns transition time. This
product implements bootstrapping on the upper gate with an
internal bootstrap Schottky diode, reducing implementation
cost, complexity, and allowing the use of higher
performance, cost effective N-Channel MOSFETs. Adaptive
shoot-through protection is integrated to prevent both
MOSFETs from conducting simultaneously.
• Three-State PWM Input for Power Stage Shutdown
The ISL6605 features 4A typical sink current for the lower
gate driver, which is capable of holding the lower MOSFET
gate during the Phase node rising edge to prevent shootthrough power loss caused by the high dv/dt of the Phase
node.
The ISL6605 also features a Three-State PWM input that,
working together with Intersil multi-phase PWM controllers,
will prevent a negative transient on the output voltage when
the output is being shut down. This feature eliminates the
Schottky diode that is usually seen in a microprocessor
power system for protecting the microprocessor from
reversed-output-voltage damage.
• Adaptive Shoot-Through Protection
• 0.4 On-Resistance and 4A Sink Current Capability
• Supports High Switching Frequency
- Fast Output Rise and Fall Time
- Ultra Low Propagation Delay 8ns
• Internal Bootstrap Schottky Diode
• Low Bias Supply Current (5V, 30µA)
• Enable Input
• QFN Package
- Compliant to JEDEC PUB95 MO-220 QFN-Quad Flat
No Leads-Product Outline.
- Near Chip-Scale Package Footprint; Improves PCB
Efficiency and Thinner in Profile.
• Pb-Free Plus Anneal Available (RoHS Compliant)
Applications
• Core Voltage Supplies for Intel® and AMD®
Microprocessors
• High Frequency Low Profile DC/DC Converters
• High Current Low Voltage DC/DC Converters
• Synchronous Rectification for Isolated Power Supplies
Related Literature
• Technical Brief TB363 “Guidelines for Handling and
Processing Moisture Sensitive Surface Mount Devices
(SMDs)”
UGATE 1
8
PHASE
BOOT 2
7
EN
PWM 3
6
VCC
GND 4
5
LGATE
PHASE
ISL6605
(8 LD QFN)
TOP VIEW
ISL6605
(8 LD SOIC)
TOP VIEW
UGATE
Pinouts
• Drives Two N-Channel MOSFETs
8
7
BOOT 1
66 EN
PWM 2
FN9091 Rev 7.00
May 9, 2006
3
4
GND
LGATE
5 VCC
Page 1 of 10
ISL6605
Ordering Information
Ordering Information
PART
NUMBER*
PART
MARKING
TEMP.
RANGE (°C)
PACKAGE
PART
NUMBER*
PKG.
DWG. #
ISL6605CB
ISL6605CB
0 to 70
8 Ld SOIC
M8.15
ISL6605CBZ
(Note)
ISL6605CBZ
0 to 70
8 Ld SOIC
(Pb-free)
M8.15
ISL6605CBZA
(Note)
ISL6605CBZ
0 to 70
8 Ld SOIC
(Pb-free)
M8.15
ISL6605CR
605C
0 to 70
8 Ld 3x3 QFN L8.3x3
ISL6605CRZ
(Note)
05CZ
0 to 70
8 Ld 3x3 QFN L8.3x3
(Pb-free)
ISL6605CRZA
(Note)
05CZ
0 to 70
8 Ld 3x3 QFN L8.3x3
(Pb-free)
ISL6605IB
ISL6605IB
-40 to 85
8 Ld SOIC
M8.15
ISL6605IBZ
(Note)
6605IBZ
-40 to 85
8 Ld SOIC
(Pb-free)
M8.15
PART
MARKING
TEMP.
RANGE (°C)
PACKAGE
PKG.
DWG. #
ISL6605IBZA
(Note)
6605IBZ
-40 to 85
8 Ld SOIC
(Pb-free)
M8.15
ISL6605IR
605I
-40 to 85
8 Ld 3x3 QFN L8.3x3
ISL6605IRZ
(Note)
05IZ
-40 to 85
8 Ld 3x3 QFN L8.3x3
(Pb-free)
ISL6605IRZA
(Note)
05IZ
-40 to 85
8 Ld 3x3 QFN L8.3x3
(Pb-free)
ISL6558EVAL2 Evaluation Platform (ISL6558IR+ISL6605IR)
*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.
ti
Block Diagram
ISL6605
VCC
BOOT
EN
UGATE
VCC
20K
PWM
CONTROL
LOGIC
20K
PHASE
SHOOTTHROUGH
PROTECTION
VCC
LGATE
GND
FN9091 Rev 7.00
May 9, 2006
Page 2 of 10
ISL6605
Typical Application - Multi-Phase Converter Using ISL6605 Gate Drivers
VIN
+5V
+5V
+5V
COMP
VCC
VSEN
PWM1
PWM2
PGOOD
+VCORE
BOOT
VCC
FB
UGATE
EN
PWM
ISL6605
499K*
PHASE
LGATE
PWM
CONTROL
(HIP63XX
or ISL65XX)
ISEN1
VID
(OPTIONAL)
ISEN2
VCC
FS/EN
GND
VIN
+5V
BOOT
UGATE
EN
PWM
499K*
PHASE
ISL6605
LGATE
* 499K IS USED TO PULL DOWN THE PWM INPUT TO PREVENT THE PWM FROM FALSE TRIGGERING UGATE DURING STARTUP.
FN9091 Rev 7.00
May 9, 2006
Page 3 of 10
ISL6605
Absolute Maximum Ratings
Recommended Operating Conditions
Supply Voltage (VCC) . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 7V
Input Voltage (VEN, VPWM) . . . . . . . . . . . . . . . -0.3V to VCC + 0.3V
BOOT Voltage (VBOOT). . . . . . . -0.3V to 22V (DC) or 33V (
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