ISL6608CBZ-T

1
®
ISL6608
Synchronous Rectified MOSFET Driver
with Pre-Biased Load Startup Capability
The ISL6608 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 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.
The IC is biased by a single low voltage supply (5V) and
minimizes gate drive losses due to MOSFET gate charge at
high switching frequency applications. Each driver is capable
of driving a 3000pF load with a low 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.
The ISL6608 features 4A sink current for the lower gate
driver, which is capable of holding the lower MOSFET gate
during the Phase node rising edge to prevent shoot-through
power loss caused by the high dv/dt of the Phase node.
The ISL6608 also features a Three-State PWM input which,
working together with Intersil multi-phase PWM controllers,
will prevent a negative transient on the output voltage when
the output is 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 events.
A diode emulation feature is integrated in the ISL6608 to
enhance converter efficiency at light load conditions. Diode
emulation also prevents a negative transient when starting
up with a pre-biased voltage on the output. When diode
emulation is enabled, the driver allows discontinuous
conduction mode by detecting when the inductor current
reaches zero and subsequently turns off the low side
MOSFET, which prevents the output from sinking current
and producing a negative transient on a pre-biased output
(see Figures 6 and 7 on page 7).
Features
Dual MOSFET Drives for Synchronous Rectified Bridge
Adaptive Shoot-Through Protection
•0.5 On-Resistance and 4A Sink Current Capability
Supports High Switching Frequency up to 2MHz
- Fast Output Rise/Fall Time and 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
Pre-Biased Startup Applications
VCC POR (Power-On-Reset) Feature Integrated
Low Three-State Shutdown Holdoff Time (Typically 160ns)
Pin-to-Pin Compatible with ISL6605
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 as an Option
Applications
Core Voltage Supplies for FPGAs and PowerPC
Microprocessors
Point-Of-Load Modules with Pre-Biased Start-Up
Requirements
High Frequency and High Current DC-DC Converters
Related Literature
Technical Brief TB363 “Guidelines for Handling and
Processing Moisture Sensitive Surface Mount Devices”
Data Sheet March 2004 FN9140.1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143
| Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2004. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
2
Ordering Information
PART NUMBER
TEMP RANGE
C) PACKAGE
PKG.
DWG. #
ISL6608CB 0 to 70 8 Ld SOIC M8.15
ISL6608CB-T 8 Ld SOIC Tape and Reel
ISL6608CR 0 to 70 8 Ld 3x3 QFN L8.3x3
ISL6608CR-T 8 Ld 3x3 QFN Tape and Reel
ISL6608CBZ (Note) 0 to 70 8 Ld SOIC
(Lead-Free)
M8.15
ISL6608CBZ-T 8 Ld SOIC Tape and Reel (Lead-Free)
ISL6608CRZ (Note) 0 to 70 8 Ld 3x3 QFN
(Lead-Free)
L8.3x3
ISL6608CRZ-T 8 Ld 3x3 QFN Tape and Reel (Lead-Free)
ISL6608IB -40 to 85 8 Ld SOIC M8.15
ISL6608IB-T 8 Ld SOIC Tape and Reel
ISL6608IR -40 to 85 8 Ld 3x3 QFN L8.3x3
ISL6608IR-T 8 Ld 3x3 QFN Tape and Reel
ISL6608IBZ (Note) -40 to 85 8 Ld SOIC
(Lead-Free)
M8.15
ISL6608IBZ-T (Note) 8 Ld SOIC Tape and Reel (Lead-Free)
ISL6608IRZ (Note) -40 to 85 8 Ld 3x3 QFN
(Lead-Free)
L8.3x3
ISL6608IRZ-T (Note) 8 Ld 3x3 QFN Tape and Reel (Lead-Free)
NOTE: Intersil Lead-Free products employ special lead-free
material sets; molding compounds/die attach materials and 100%
matte tin plate termination finish, which is compatible with both SnPb
and lead-free soldering operations. Intersil Lead-Free products are
MSL classified at lead-free peak reflow temperatures that meet or
exceed the lead-free requirements of IPC/JEDEC J Std-020B.
Ordering Information (Continued)
PART NUMBER
TEMP RANGE
C) PACKAGE
PKG.
DWG. #
Pinouts
ISL6608CB (SOIC)
TOP VIEW
ISL6608CR (3X3 QFN)
TOP VIEW
UGATE
BOOT
PWM
GND
1
2
3
4
8
7
6
5
PHASE
FCCM
VCC
LGATE
BOOT
PWM
VCC
FCCM
LGATE
GND
UGATE
PHASE
7
8
43
1
2
6
5
6
ISL6608
3
Block Diagram
Typical Application - Multi-Phase Converter Using ISL6608 Gate Drivers
VCC
PWM
10K
CONTROL
LOGIC
SHOOT-
THROUGH
PROTECTION
BOOT
UGATE
PHASE
LGATE
GND
VCC
FCCM
THERMAL PAD (FOR QFN PACKAGE ONLY)
ISL6608
+5V
BOOT
UGATE
PHASE
LGATE
PWM
FCCM
VCC
DRIVE
V
BAT
+5V
BOOT
UGATE
PHASE
LGATE
PWM
V
BAT
+V
CORE
PGOOD
VID
FS
GND
ISEN2
ISEN1
PWM2
PWM1
VSEN
MAIN
FB
VCC
+5V
COMP
ISL6608
CONTROL
VCC
DRIVE
ISL6608
+5V
DACOUT
FCCM
FCCM
THERMAL
PAD
THERMAL
PAD
ISL6608

ISL6608CBZ-T

Mfr. #:
Manufacturer:
Renesas / Intersil
Description:
Gate Drivers VER OF ISL6608CB-T
Lifecycle:
New from this manufacturer.
Delivery:
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