DATASHEET
ISL6208C
FN8395
Rev 1.00
Jun 1, 2016
High Voltage Synchronous Rectified Buck MOSFET Drivers
The ISL6208C is a high frequency, dual MOSFET driver,
optimized to drive two N-channel power MOSFETs in a
synchronous-rectified buck converter topology. It is especially
suited for mobile computing applications that require high
efficiency and excellent thermal performance. The driver,
combined with an Intersil multiphase buck PWM controller,
forms a complete single-stage core-voltage regulator solution
for advanced mobile microprocessors.
The ISL6208C features 4A typical sinking current for the lower
gate driver. This current is capable of holding the lower
MOSFET gate off during the rising edge of the phase node. This
prevents shoot-through power loss caused by the high dv/dt of
phase voltages. The operating voltage matches the 30V
breakdown voltage of the MOSFETs commonly used in mobile
computer power supplies.
Features
• Dual MOSFET drives for synchronous rectified bridge
• Adaptive shoot-through protection
• 0.5Ω ON-resistance and 4A sink current capability
• Supports high switching frequency up to 2MHz
- Fast output rise and fall time
- Low propagation delay
• Three-state PWM input for power stage shutdown
• Internal bootstrap Schottky diode
• Low bias supply current (5V, 80µA)
• Diode emulation for enhanced light load efficiency and
prebiased start-up applications
The ISL6208C also features a three-state PWM input that,
working together with Intersil’s multiphase PWM controllers,
will prevent negative voltage output during CPU shutdown. This
feature eliminates a protective Schottky diode usually seen in
microprocessor power systems.
• VCC POR (Power-On-Reset) feature integrated
MOSFET gates can be efficiently switched up to 2MHz using
the ISL6208C. Each driver is capable of driving a 3000pF load
with propagation delays of 8ns and transition times under
10ns. Bootstrapping is implemented with an internal Schottky
diode. This reduces system cost and complexity, while allowing
the use of higher performance MOSFETs. Adaptive
shoot-through protection is integrated to prevent both
MOSFETs from conducting simultaneously.
• Pb-free (RoHS compliant)
A diode emulation feature is integrated in the ISL6208C to
enhance converter efficiency at light load conditions. This
feature also allows for monotonic start-up into prebiased
outputs. When diode emulation is enabled, the driver will allow
discontinuous conduction mode by detecting when the
inductor current reaches zero and subsequently turning off the
low-side MOSFET gate.
• High input voltage DC/DC converters
• Low three-state shutdown holdoff time (typical 160ns)
• Pin-to-pin compatible with ISL6207
• DFN package
Applications
• Core voltage supplies for Intel™ and AMD™ mobile
microprocessors
• High frequency low profile DC/DC converters
• High current low output voltage DC/DC converters
Related Literature
• Technical Brief TB363 “Guidelines for Handling and
Processing Moisture Sensitive Surface Mount Devices
(SMDs)”
• Technical Brief TB389 “PCB Land Pattern Design and
Surface Mount Guidelines for MLFP Packages”
• Technical Brief TB447 “Guidelines for Preventing
Boot-to-Phase Stress on Half-Bridge MOSFET Driver ICs”
FN8395 Rev 1.00
Jun 1, 2016
Page 1 of 12
ISL6208C
Table of Contents
Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Typical Application with 2-Phase Converter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Pin Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Pin Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Thermal Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Recommended Operating Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Timing Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Functional Pin Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Theory of Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Typical Performance Waveforms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Diode Emulation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Three-State PWM Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Adaptive Shoot-Through Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Layout Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Reducing Phase Ring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Thermal Management. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Revision History. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
About Intersil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Package Outline Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
FN8395 Rev 1.00
Jun 1, 2016
Page 2 of 12
ISL6208C
Block Diagram
VCC
BOOT
FCCM
UGATE
PHASE
SHOOTTHROUGH
PROTECTION
CONTROL
LOGIC
PWM
VCC
LGATE
10kΩ
GND
THERMAL PAD
FIGURE 1. BLOCK DIAGRAM
Typical Application with 2-Phase Converter
+5V
VBAT
+5V
+5V
VCC
FB
VSEN
PWM1
PWM
PWM2
PGOOD
UGATE
FCCM
VCC
PHASE
DRIVE
ISL6208C
THERMAL
PAD
FCCM
MAIN
CONTROL
+VCORE
BOOT
COMP
LGATE
ISEN1
VID
ISEN2
+5V
VBAT
VCC
BOOT
FS
DACOUT
GND
FCCM
PWM
UGATE
DRIVE
ISL6208C
PHASE
THERMAL LGATE
PAD
FIGURE 2. TYPICAL APPLICATION WITH 2-PHASE CONVERTER
FN8395 Rev 1.00
Jun 1, 2016
Page 3 of 12
ISL6208C
Ordering Information
PART NUMBER
(Notes 1, 2, 3)
PART
MARKING
TEMP. RANGE
(°C)
TAPE AND REEL
(UNITS)
PACKAGE
(RoHS Compliant)
PKG.
DWG. #
ISL6208CHRZ-T
8CH
-10 to +100
6k
8 Ld 2x2 DFN
L8.2x2D
ISL6208CIRZ-T
8CI
-40 to +100
6k
8 Ld 2x2 DFN
L8.2x2D
NOTES:
1. Please refer to TB347 for details on reel specifications.
2. These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100% matte
tin plate plus anneal (e3 termination finish, which is 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.
3. For Moisture Sensitivity Level (MSL), please see device information page for ISL6208C. For more information on MSL please see techbrief TB363.
Pin Configuration
ISL6208C
(8 LD 2x2 DFN)
TOP VIEW
UGATE 1
86 PHASE
BOOT 2
7 FCCM
PWM 3
66 VCC
GND 4
5 LGATE
Pin Description
PIN
SYMBOL
1
UGATE
The UGATE pin is the upper gate drive output. Connect to gate of the high-side power N-channel MOSFET.
2
BOOT
BOOT is the floating bootstrap supply pin for the upper gate drive. Connect the bootstrap capacitor between this pin
and the PHASE pin. The bootstrap capacitor provides the charge to turn on the upper MOSFET. See “Internal
Bootstrap Diode” on page 9 for guidance in choosing the appropriate capacitor value.
3
PWM
The PWM signal is the control input for the driver. The PWM signal can enter three distinct states during operation. See
“Three-State PWM Input” on page 9 for further details. Connect this pin to the PWM output of the controller.
4
GND
GND is the ground pin for the IC.
5
LGATE
6
VCC
7
FCCM
The FCCM pin enables or disables Diode Emulation. When FCCM is LOW, diode emulation is allowed. Otherwise,
continuous conduction mode is forced. See “Diode Emulation” on page 9 for more detail.
8
PHASE
Connect the PHASE pin to the source of the upper MOSFET and the drain of the lower MOSFET. This pin provides a
return path for the upper gate driver.
FN8395 Rev 1.00
Jun 1, 2016
DESCRIPTION
LGATE is the lower gate drive output. Connect to gate of the low-side power N-Channel MOSFET.
Connect the VCC pin to a +5V bias supply. Place a high quality bypass capacitor from this pin to GND. The VCC pin
of the driver(s) and related VCC or +5V bias supply pin of the Intersil controller must share a common +5V supply.
Page 4 of 12
ISL6208C
Absolute Maximum Ratings
Thermal Information
Supply Voltage (VCC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 7V
Input Voltage (VFCCM, VPWM) . . . . . . . . . . . . . . . . . . . . -0.3V to VCC + 0.3V
BOOT Voltage (VBOOT-GND) . . . . . . . . . . . -0.3V to 33V (DC) or 36V (
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