DATASHEET
ISL6609, ISL6609A
Synchronous Rectified MOSFET Driver
The ISL6609, ISL6609A is a high frequency, MOSFET driver
optimized to drive two N-Channel power MOSFETs in a
synchronous-rectified buck converter topology. This driver
combined with an Intersil ISL63xx or ISL65xx multiphase
PWM controller forms a complete single-stage core-voltage
regulator solution with high efficiency performance at high
switching frequency for advanced microprocessors.
The IC is biased by a single low voltage supply (5V),
minimizing driver switching losses in high MOSFET gate
capacitance and high switching frequency applications.
Each driver is capable of driving a 3nF load with less than
10ns rise/fall time. Bootstrapping of the upper gate driver is
implemented via an internal low forward drop 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.
The ISL6609, ISL6609A features 4A typical sink current for
the lower gate driver, enhancing the lower MOSFET gate
hold-down capability during PHASE node rising edge,
preventing power loss caused by the self turn-on of the lower
MOSFET due to the high dV/dt of the switching node.
The ISL6609, ISL6609A also features an input that
recognizes a high-impedance state, working together with
Intersil multiphase PWM controllers to prevent negative
transients on the controlled output voltage when operation is
suspended. This feature eliminates the need for the schottky
diode that may be utilized in a power system to protect the
load from negative output voltage damage. In addition, the
ISL6609A’s bootstrap function is designed to prevent the
BOOT capacitor from overcharging, should excessively large
negative swings occur at the transitions of the PHASE node.
FN9221
Rev 2.00
April 27, 2009
Features
• Drives Two N-Channel MOSFETs
• Adaptive Shoot-Through Protection
• 0.4 On-Resistance and 4A Sink Current Capability
• Supports High Switching Frequency
- Fast Output Rise and Fall
- Ultra Low Three-State Hold-Off Time (20ns)
• ISL6605 Replacement with Enhanced Performance
• BOOT Capacitor Overcharge Prevention (ISL6609A)
• Low V
F
Internal Bootstrap Diode
• Low Bias Supply Current
• Enable Input and Power-On Reset
• 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 (RoHS Compliant)
Applications
• Core Voltage Supplies for Intel® and AMD®
Microprocessors
• High Frequency Low Profile High Efficiency 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)”
FN9221 Rev 2.00
April 27, 2009
Page 1 of 12
ISL6609, ISL6609A
Absolute Maximum Ratings
Supply Voltage (VCC) . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 7V
Input Voltage (V
EN
, V
PWM
) . . . . . . . . . . . . . . . -0.3V to VCC + 0.3V
BOOT Voltage (V
BOOT-GND
). . . -0.3V to 27V (DC) or 36V (<200ns)
BOOT To PHASE Voltage (V
BOOT-PHASE
) . . . . . . -0.3V to 7V (DC)
-0.3V to 9V (<10ns)
PHASE Voltage . . . . . . . . . . . . . . . . . . . . . GND - 0.3V to 27V (DC)
GND -8V (<20ns Pulse Width, 10J) to 30V (<100ns)
UGATE Voltage . . . . . . . . . . . . . . . . V
PHASE
- 0.3V (DC) to V
BOOT
V
PHASE
- 5V (<20ns Pulse Width, 10J) to V
BOOT
LGATE Voltage . . . . . . . . . . . . . . . GND - 0.3V (DC) to VCC + 0.3V
GND - 2.5V (<20ns Pulse Width, 5J) to VCC + 0.3V
Ambient Temperature Range . . . . . . . . . . . . . . . . . .-40°C to +125°C
Thermal Information
Thermal Resistance (Notes 1, 2, 3)
JA
(°C/W)
JC
(°C/W)
SOIC Package (Note 1) . . . . . . . . . . . .
110
N/A
QFN Package (Notes 2, 3). . . . . . . . . .
95
36
Maximum Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . 150°C
Maximum Storage Temperature Range . . . . . . . . . . . -65°C to 150°C
Pb-Free Reflow Profile. . . . . . . . . . . . . . . . . . . . . . . . .see link below
http://www.intersil.com/pbfree/Pb-FreeReflow.asp
Recommended Operating Conditions
Ambient Temperature Range . . . . . . . . . . . . . . . . . . .-40°C to 100°C
Maximum Operating Junction Temperature . . . . . . . . . . . . . . 125°C
Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5V
10%
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product reliability and
result in failures not covered by warranty.
NOTES:
1.
JA
is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief TB379 for details.
2.
JA
is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features.
3.
JC
, “case temperature” location is at the center of the package underside exposed pad. See Tech Brief TB379 for details.
Electrical Specifications
These specifications apply for T
A
= -40°C to 100°C, unless otherwise noted. Parameters with MIN and/or MAX
limits are 100% tested at +25°C, unless otherwise specified. Temperature limits established by characterization
and are not production tested.
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNITS
PARAMETER
VCC SUPPLY CURRENT
Bias Supply Current
POR Rising
POR Falling
Hysteresis
PWM INPUT
Sinking Impedance
Source Impedance
Three-State Rising Threshold
Three-State Falling Threshold
Three-State Shutdown Holdoff Time
EN INPUT
EN LOW Threshold
EN HIGH Threshold
SWITCHING TIME
(See Figure 1 on Page 7)
UGATE Rise Time (Note 4)
LGATE Rise Time (Note 4)
UGATE Fall Time (Note 4)
LGATE Fall Time (Note 4)
UGATE Turn-Off Propagation Delay
LGATE Turn-Off Propagation Delay
I
VCC
PWM pin floating, V
VCC
= 5V
-
-
2.2
-
132
3.4
3.0
400
-
4.2
-
-
A
mV
R
PWM_SNK
R
PWM_SRC
V
VCC
= 5V (100mV Hysteresis)
V
VCC
= 5V (100mV Hysteresis)
t
TSSHD
t
PDLU
or t
PDLL
+ Gate Falling Time
2.75
3
-
3.10
-
4
4.25
1.70
3.41
20
5.5
5.75
2.00
-
-
k
k
V
V
ns
1.0
-
1.3
1.6
-
2.0
V
V
t
RU
t
RL
t
FU
t
FL
t
PDLU
t
PDLL
V
VCC
= 5V, 3nF Load
V
VCC
= 5V, 3nF Load
V
VCC
= 5V, 3nF Load
V
VCC
= 5V, 3nF Load
V
VCC
= 5V, Outputs Unloaded
V
VCC
= 5V, Outputs Unloaded
-
-
-
-
-
-
8.0
8.0
8.0
4.0
18
25
-
-
-
-
-
-
ns
ns
ns
ns
ns
ns
FN9221 Rev 2.00
April 27, 2009
Page 5 of 12
Test/Measurement
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