isl6620 Intersil Corporation, isl6620 Datasheet

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isl6620

Manufacturer Part Number
isl6620
Description
Vr11.1, 4-phase Pwm Controller With Light Load Efficiency Enhancement And Load Current Monitoring
Manufacturer
Intersil Corporation
Datasheet

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VR11.1 Compatible Synchronous
Rectified Buck MOSFET Drivers
The ISL6620, ISL6620A is a high frequency MOSFET driver
designed to drive upper and lower power N-Channel
MOSFETs in a synchronous rectified buck converter topology.
The advanced PWM protocol of ISL6620, ISL6620A is
specifically designed to work with Intersil VR11.1 controllers
and combined with N-Channel MOSFETs, form a complete
core-voltage regulator solution for advanced microprocessors.
When ISL6620, ISL6620A detects a PSI protocol sent by an
Intersil VR11.1 controller, it activates Diode Emulation (DE)
operation; otherwise, it operates in normal Continuous
Conduction Mode (CCM) PWM mode.
The IC is biased by a single low voltage supply (5V),
minimizing driving losses in high MOSFET gate capacitance
and high switching frequency applications. Each driver is
capable of driving a 3nF load with less than 10ns rise/fall time.
Bootstrapping of the upper gate driver is implemented via an
internal low forward drop diode, reducing implementation cost,
complexity, and allowing the use of higher performance, cost
effective N-Channel MOSFETs.
To further enhance light load efficiency, ISL6620, ISL6620A
enables diode emulation operation during PSI mode. This
allows Discontinuous Conduction Mode (DCM) by detecting
when the inductor current reaches zero and subsequently
turning off the low side MOSFET to prevent it from sinking
current.
An advanced adaptive shoot-through protection is integrated
to prevent both the upper and lower MOSFETs from
conducting simultaneously and to minimize dead time. The
ISL6620, ISL6620A has a 20kΩ integrated high-side
gate-to-source resistor to prevent self turn-on due to high
input bus dV/dt.
®
1
Data Sheet
1-888-INTERSIL or 1-888-468-3774
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Features
• Dual MOSFET Drives for Synchronous Rectified Bridge
• Advanced Adaptive Zero Shoot-Through Protection
• 36V Internal Bootstrap Schottky Diode
• Advanced PWM Protocol (Patent Pending) to Support PSI
• Diode Emulation For Enhanced Light Load Efficiency
• Bootstrap Capacitor Overcharging Prevention
• Supports High Switching Frequency
• VCC Undervoltage Protection
• Enable Input and Power-On Reset
• Expandable Bottom Copper Pad for Enhanced Heat
• DFN Package:
• Pb-Free (RoHS Compliant)
Applications
• High Light Load Efficiency Voltage Regulators
• Core Regulators for Advanced Microprocessors
• High Current DC/DC Converters
• High Frequency and High Efficiency VRM and VRD
Related Literature
• Technical Brief TB363 “Guidelines for Handling and
• Technical Brief TB417 “Designing Stable Compensation
Mode, Diode Emulation, Three-State Operation
- 4A Sinking Current Capability
- Fast Rise/Fall Times and Low Propagation Delays
Sinking
- Compliant to JEDEC PUB95 MO-220
- Near Chip Scale Package Footprint, which Improves
Processing Moisture Sensitive Surface Mount Devices
(SMDs)”
Networks for Single Phase Voltage Mode Buck
Regulators” for Power Train Design, Layout Guidelines,
and Feedback Compensation Design
DFN - Dual Flat No Leads - Package Outline
PCB Efficiency and has a Thinner Profile
All other trademarks mentioned are the property of their respective owners.
April 25, 2008
|
Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2008. All Rights Reserved
ISL6620, ISL6620A
FN6494.0

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isl6620 Summary of contents

Page 1

... Intersil VR11.1 controllers and combined with N-Channel MOSFETs, form a complete core-voltage regulator solution for advanced microprocessors. When ISL6620, ISL6620A detects a PSI protocol sent by an Intersil VR11.1 controller, it activates Diode Emulation (DE) operation; otherwise, it operates in normal Continuous Conduction Mode (CCM) PWM mode. ...

Page 2

... PHASE VCC 6 LGATE 5 ISL6620, ISL6620A *R BOOT SHOOT- THROUGH PROTECTION CONTROL LOGIC ) AVAILABLE ONLY IN ISL6620A BOOT PACKAGE (Pb-free) PKG. DWG SOIC M8. 3x3 DFN L10.3x3 8 Ld SOIC M8. 3x3 DFN L10.3x3 8 Ld SOIC M8. 3x3 DFN L10.3x3 8 Ld SOIC M8 ...

Page 3

... ISEN2- VID1 ISEN2+ VID0 PSI VR_FAN ISEN3- VR_HOT ISEN3+ VIN EN_PWR GND IMON ISEN4- ISEN4+ TCOMP TM OFS FS +5V +5V NTC 3 ISL6620, ISL6620A +5V EN VCC ISL6620, ISL6620A DRIVER PWM DAC REF PWM1 +5V VCTRL VCC ISL6596 DRIVER PWM PWM2 +5V VCTRL PWM3 VCC ISL6596 DRIVER ...

Page 4

... V BOOT BOOT Recommended Operating Conditions Ambient Temperature Range ISL6620IBZ, ISL6620IRZ, ISL6620AIBZ, ISL6620AIRZ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-40°C to +85°C ISL6620CBZ, ISL6620CRZ, ISL6620ACBZ, ISL6620ACRZ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to +70°C Maximum Operating Junction Temperature +125°C Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5V ±10% SYMBOL TEST CONDITIONS IVCC f_PWM = 300kHz, V_VCC = 5V IVCC PWM ...

Page 5

... Connect this 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 drive PAD Connect this pad to the power ground plane (GND) via thermally enhanced connection. 5 ISL6620, ISL6620A SYMBOL TEST CONDITIONS t_RL VCC = 5V, 3nF load, 10% to 90% t_FU VCC = 5V, 3nF load, 10% to 90% ...

Page 6

... Advanced PWM Protocol (Patent Pending) The advanced PWM protocol of ISL6620, ISL6620A is specifically designed to work with Intersil VR11.1 controllers. When ISL6620, ISL6620A detects a PSI protocol sent by an Intersil VR11.1 controller, it turns on diode emulation operation; otherwise, it remains in normal CCM PWM mode. The controller communicates the tri-state signal to the driver by transitioning the PWM signal from ...

Page 7

... If VCC drops below the falling threshold of 3.5V (typically), operation of the driver is disabled. Internal Bootstrap Device ISL6620, ISL6620A features an internal bootstrap Schottky diode. Simply adding an external capacitor across the BOOT and PHASE pins completes the bootstrap circuit. The bootstrap function is also designed to prevent the bootstrap capacitor from overcharging due to the large negative swing at the trailing-edge of the PHASE node ...

Page 8

... The selection of D -PAK, or D-PAK packaged MOSFETs much better match (for the reasons discussed) for the ISL6620A. Low-profile MOSFETs, such as Direct FETs and multi-source leads devices (SO-8, LFPAK, PowerPAK), have low parasitic lead inductances and can be driven by either ISL6620 or ISL6620A (assuming proper layout design). The ISL6620, missing the 3Ω ...

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 ISL6620, ISL6620A 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 ISL6620, ISL6620A M8.15 (JEDEC MS-012-AA ISSUE C) 8 LEAD NARROW BODY SMALL OUTLINE PLASTIC PACKAGE ...

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