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Renesas Electronics Components Datasheet

ISL6594A Datasheet

Advanced Synchronous Rectified Buck MOSFET Drivers

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DATASHEET
ISL6594A, ISL6594B
Advanced Synchronous Rectified Buck MOSFET Drivers with Protection Features
FN9157
Rev 6.00
Sep 11, 2015
The ISL6594A and ISL6594B are high frequency MOSFET
drivers specifically designed to drive upper and lower power
N-Channel MOSFETs in a synchronous rectified buck
converter topology. These drivers combined with the
ISL6592 Digital Multi-Phase Buck PWM controller and
N-Channel MOSFETs form a complete core-voltage
regulator solution for advanced microprocessors.
The ISL6594A drives the upper gate to 12V, while the lower
gate can be independently driven over a range from 5V to
12V. The ISL6594B drives both upper and lower gates over
a range of 5V to 12V. This drive-voltage provides the
flexibility necessary to optimize applications involving
trade-offs between gate charge and conduction losses.
An adaptive zero shoot-through protection is integrated to
prevent both the upper and lower MOSFETs from conducting
simultaneously and to minimize the dead time. These
products add 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 during initial start-up.
These drivers also feature a three-state PWM input which,
working together with Intersil’s multi-phase PWM controllers,
prevents a negative transient on the output voltage when the
output is shut down. This feature eliminates the Schottky
diode that is used in some systems for protecting the load
from reversed output voltage events.
Features
• Dual MOSFET Drives for Synchronous Rectified Bridge
• Adjustable Gate Voltage (5V to 12V) for Optimal Efficiency
• 36V Internal Bootstrap Schottky Diode
• Bootstrap Capacitor Overcharging Prevention
• Supports High Switching Frequency (up to 2MHz)
- 3A Sinking Current Capability
- Fast Rise/Fall Times and Low Propagation Delays
• Three-State PWM Input for Output Stage Shutdown
• Three-State PWM Input Hysteresis for Applications with
Power Sequencing Requirement
• Pre-POR Overvoltage Protection
• VCC Undervoltage 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
• Pb-Free Available (RoHS Compliant)
Applications
• 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 TB417 for Power Train Design, Layout
Guidelines, and Feedback Compensation Design
FN9157 Rev 6.00
Sep 11, 2015
Page 1 of 11


Renesas Electronics Components Datasheet

ISL6594A Datasheet

Advanced Synchronous Rectified Buck MOSFET Drivers

No Preview Available !

ISL6594A, ISL6594B
Ordering Information
PART
NUMBER
PART
MARKING
TEMP.
RANGE (°C)
PACKAGE
(RoHS Compliant)
PKG.
DWG. #
ISL6594ACRZ* (Note)
94AZ
0 to +85 10 Ld 3x3 DFN
L10.3x3
ISL6594BCBZ* (Note)
6594 BCBZ
(No longer available, recommended replacement: ISL6594ACRZ-T)
0 to +85 8 Ld SOIC
M8.15
*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.
Pinouts
ISL6594ACB, ISL6594BCB
(8 LD SOIC)
TOP VIEW
UGATE
BOOT
PWM
GND
NO
1
2
3
LO4NGER
AVAILABLE
OR
SU87PPOPPRHVTCAEDCSE
6 VCC
5 LGATE
ISL6594ACR, ISL6594BCR
(10 LD 3x3 DFN)
TOP VIEW
UGATE 1
BOOT 2
N/C 3
PWM 4
GND 5
10 PHASE
9 PVCC
8 N/C
7 VCC
6 LGATE
Block Diagram
ISL6594A AND ISL6594B
VCC
PWM
UVCC
+5V PRE-POR OVP
FEATURES
13.6k
6.4k
POR/
CONTROL
LOGIC
SHOOT-
THROUGH
PROTECTION
(LVCC)
BOOT
UGATE
PHASE
PVCC
UVCC = VCC FOR ISL6594A
UVCC = PVCC FOR ISL6594B
LGATE
PAD
GND
FOR DFN -DEVICES, THE PAD ON THE BOTTOM SIDE OF
THE PACKAGE MUST BE SOLDERED TO THE CIRCUIT’S GROUND.
FN9157 Rev 6.00
Sep 11, 2015
Page 2 of 11


Part Number ISL6594A
Description Advanced Synchronous Rectified Buck MOSFET Drivers
Maker Renesas
Total Page 11 Pages
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