DATASHEET
ISL6594D
FN9282
Rev 1.00
Dec 3, 2007
Advanced Synchronous Rectified Buck MOSFET Drivers with Protection Features
The ISL6594D is high frequency MOSFET driver specifically
designed to drive upper and lower power N-Channel
MOSFETs in a synchronous rectified buck converter
topology. This driver combined with the ISL6594D Digital
Multi-Phase Buck PWM controller and N-Channel MOSFETs
forms a complete core-voltage regulator solution for
advanced microprocessors.
The ISL6594D drives both upper and lower gates over a range
of 4.5V to 13.2V. This drive-voltage provides the flexibility
necessary to optimize applications involving trade-offs between
gate charge and conduction losses.
Features
• Dual MOSFET Drives for Synchronous Rectified Bridge
• Pin-to-pin Compatible with ISL6596
• Advanced Adaptive Zero Shoot-Through Protection
- Body Diode Detection
- Auto-zero of rDS(ON) Conduction Offset Effect
• Adjustable Gate Voltage for Optimal Efficiency
• 36V Internal Bootstrap Schottky Diode
• Bootstrap Capacitor Overcharging Prevention
An advanced adaptive zero shoot-through protection is
integrated to prevent both the upper and lower MOSFETs
from conducting simultaneously and to minimize the dead
time. The ISL6594D includes an overvoltage protection
feature operational before VCC exceeds its turn-on
threshold, at which the PHASE node is connected to the
gate of the low side MOSFET (LGATE). The output voltage
of the converter is then limited by the threshold of the low
side MOSFET, which provides some protection to the
microprocessor if the upper MOSFET(s) is shorted.
• Supports High Switching Frequency (up to 2MHz)
- 3A Sinking Current Capability
- Fast Rise/Fall Times and Low Propagation Delays
The ISL6594D 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.
• VCC Undervoltage Protection
Ordering Information
• Pb-Free (RoHS Compliant)
PART NUMBER
PART
TEMP.
(Note)
MARKING RANGE (°C)
ISL6594DCBZ
PACKAGE
(Pb-free)
PKG.
DWG. #
6594 DCBZ
0 to +85
8 Ld SOIC
M8.15
ISL6594DCBZ-T* 6594 DCBZ
0 to +85
8 Ld SOIC
M8.15
Tape and Reel
ISL6594DCRZ
94DZ
0 to +85
10 Ld 3x3 DFN L10.3x3
ISL6594DCRZ-T* 94DZ
0 to +85
10 Ld 3x3 DFN L10.3x3
Tape and Reel
*Please refer to TB347 for details on reel specifications.
NOTE: 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.
FN9282 Rev 1.00
Dec 3, 2007
• Optimized for 3.3V PWM Input
• Three-State PWM Input for Output Stage Shutdown
• Three-State PWM Input Hysteresis for Applications With
Power Sequencing Requirement
• Pre-POR Overvoltage Protection
• Expandable Bottom Copper Pad for Enhanced Heat
Sinking
• Dual Flat No-Lead (DFN) Package
- Near Chip-Scale Package Footprint; Improves PCB
Efficiency and Thinner in Profile
Applications
• Optimized for POL DC/DC Converters for IBA Systems
• Core Regulators for Intel® and AMD® Microprocessors
• High Current DC/DC Converters
• High Frequency and High Efficiency VRM and VRD
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 QFN (MLFP) Packages”
Page 1 of 11
ISL6594D
Pinouts
ISL6594DCR
(10 LD 3x3 DFN)
TOP VIEW
ISL6594DCB
(8 LD SOIC)
TOP VIEW
UGATE
1
8
PHASE
BOOT
2
7
PVCC
PWM
3
6
VCC
GND
4
5
LGATE
Block Diagram
1
UGATE
BOOT
2
N/C
3
PWM
4
GND
5
10 PHASE
9 PVCC
GND
8
N/C
7
VCC
6 LGATE
ISL6594D
UVCC
BOOT
VCC
UGATE
Pre-POR OVP
FEATURES
+5V
13.6k
PWM
6.4k
SHOOTTHROUGH
PROTECTION
POR/
CONTROL
LOGIC
PHASE
(LVCC)
PVCC
UVCC = PVCC FOR ISL6594D
LGATE
GND
PAD
FN9282 Rev 1.00
Dec 3, 2007
FOR DFN DEVICES, THE PAD ON THE BOTTOM SIDE OF
THE PACKAGE MUST BE SOLDERED TO THE CIRCUIT’S GROUND.
Page 2 of 11
ISL6594D
FN9282 Rev 1.00
Dec 3, 2007
Typical Application - 4 Channel Converter Using ISL6592 and ISL6594D Gate Drivers
+12V
ISL6594D
+5V
+3.3V
VDD
V12_SEN
2 BOOT
PVCC 7
3 PWM
VCC 6
4 GND
LGATE 5
ISL6594D
1 UGATE
PHASE 8
OUT1
2 BOOT
PVCC 7
VID4
OUT2
3 PWM
VCC 6
VID3
ISEN1
4 GND
LGATE 5
VID2
OUT3
VID1
OUT4
VID0
ISEN2
VID5
OUT5
LL0
OUT6
LL1
ISEN3
OUTEN
OUT7
OUT8
TO µP
PHASE 8
GND
ISL6592
FROM µP
1 UGATE
VCC_PWRGD
Vout
ISL6594D
1 UGATE
PHASE 8
2 BOOT
PVCC 7
3 PWM
VCC 6
4 GND
LGATE 5
RTN
ISEN4
OUT9
RESET_N
OUT10
ISL6594D
ISEN5
1 UGATE
PHASE 8
PVCC 7
FAULT
FAULT1
OUT11
2 BOOT
OUTPUTS
FAULT2
OUT12
3 PWM
VCC 6
ISEN6
4 GND
LGATE 5
Page 3 of 11
I2C I/F
BUS
SDA
TEMP_SEN
SCL
CAL_CUR_EN
SADDR
CAL_CUR_SEN
VSENP
VSENN
RTHERM
ISL6594D
Absolute Maximum Ratings
Thermal Information
Supply Voltage (VCC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15V
Supply Voltage (PVCC) . . . . . . . . . . . . . . . . . . . . . . . . . VCC + 0.3V
BOOT Voltage (VBOOT-GND). . . . . . . . . . . . . . . . . . . . . . . . . . . .36V
Input Voltage (VPWM) . . . . . . . . . . . . . . . . . . . . . . GND - 0.3V to 7V
UGATE. . . . . . . . . . . . . . . . . . . VPHASE - 0.3VDC to VBOOT + 0.3V
VPHASE - 3.5V (
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