ISL6594B

Manufacturer Part NumberISL6594B
Description(ISL6594A/B) Advanced Synchronous Rectified Buck MOSFET Drivers
ManufacturerIntersil Corporation
ISL6594B datasheet
 
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Data Sheet
Advanced Synchronous Rectified Buck
MOSFET Drivers with Protection Features
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.
1
ISL6594A, ISL6594B
July 31, 2006
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 Plus Anneal 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
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
|
1-888-INTERSIL or 1-888-468-3774
Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2004, 2005. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
FN9157.3

ISL6594B Summary of contents

  • Page 1

    ... 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 12V. This drive-voltage provides the flexibility necessary to optimize applications involving trade- offs between gate charge and conduction losses ...

  • Page 2

    ... Ld SOIC (Pb-free) M8. 3x3 DFN L10.3x3 10 Ld 3x3 DFN (Pb-free) L10.3x3 8 Ld SOIC M8. SOIC (Pb-free) M8. 3x3 DFN L10.3x3 10 Ld 3x3 DFN (Pb-free) L10.3x3 ISL6594ACR, ISL6594BCR (10 LD 3x3 DFN) TOP VIEW UGATE CRD L 1 BAT PHASE 1 0 BOOT PVCC USB ICDL 2 9 ...

  • Page 3

    Typical Application - 4 Channel Converter Using ISL6592 and ISL6594A Gate Drivers +12V +5V +3.3V VDD V12_SEN GND ISL6592 OUT1 VID4 OUT2 VID3 ISEN1 VID2 OUT3 OUT4 VID1 ISEN2 FROM µP VID0 OUT5 VID5 OUT6 LL0 ISEN3 LL1 OUTEN OUT7 ...

  • Page 4

    ... V VCC PWM ISL6594B 1MHz, V PWM I ISL6594A 300kHz, V PVCC PWM ISL6594B 300kHz, V PWM I ISL6594A 1MHz, V PVCC PWM (Note 4) ISL6594B 1MHz, V PWM 3.3V PWM PWM PWM VCC = 12V VCC = 12V VCC = 12V VCC = 12V VCC = 12V VCC = 12V θ θ (°C/W) ...

  • Page 5

    ... Connect this pin to a +12V bias supply. Place a high quality low ESR ceramic capacitor from this pin to GND PVCC This pin supplies power to both upper and lower gate drives in ISL6594B; only the lower gate drive in ISL6594A. Its operating range is +5V to 12V. Place a high quality low ESR ceramic capacitor from this pin to GND PHASE Connect this pin to the SOURCE of the upper MOSFET and the DRAIN of the lower MOSFET ...

  • Page 6

    ... PDLL Operation Designed for versatility and speed, the ISL6594A and ISL6594B MOSFET drivers control both high-side and low- side N-Channel FETs of a half-bridge power train from one externally provided PWM signal. Prior to VCC exceeding its POR level, the Pre-POR overvoltage protection function is activated during initial startup ...

  • Page 7

    ... Then the calculated to be 53nC for UVCC (i.e. PVCC in GATE ISL6594B, VCC in ISL6594A) = 12V. We will assume a 7 ISL6594A, ISL6594B 200mV droop in drive voltage over the PWM cycle. We find that a bootstrap capacitance of at least 0.267µF is required. FIGURE 2. BOOTSTRAP CAPACITANCE vs BOOT RIPPLE ...

  • Page 8

    ... HI2 EXT2 LO2 R GI1 ------------- = EXT1 G1 EXT2 ISL6594A, ISL6594B UVCC (EQ FIGURE 3. TYPICAL UPPER-GATE DRIVE TURN-ON PATH • ⎞ Q2 • ⎟ ⎠ (EQ defined at a and the GS2 is the driver’s total Q1 VCC Q* FIGURE 4 ...

  • Page 9

    ... D2 (DATUM B) D2 INDEX AREA (DATUM N (Nd-1)Xe REF. BOTTOM VIEW 0.415 NX (b) (A1) 5 SECTION "C-C" 9 ISL6594A, ISL6594B L10.3x3 2X 0. LEAD DUAL FLAT NO-LEAD PLASTIC PACKAGE 2X 0. SYMBOL 0. 0. NOTES: 1. Dimensioning and tolerancing conform to ASME Y14.5-1994. ...

  • Page 10

    ... However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries. For information regarding Intersil Corporation and its products, see www.intersil.com 10 ISL6594A, ISL6594B M8.15 (JEDEC MS-012-AA ISSUE C) 8 LEAD NARROW BODY SMALL OUTLINE PLASTIC PACKAGE ...