isl6208a Intersil Corporation, isl6208a Datasheet

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isl6208a

Manufacturer Part Number
isl6208a
Description
High Voltage Synchronous Rectified Buck Mosfet Driver With Programmable Deadtime
Manufacturer
Intersil Corporation
Datasheet

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Part Number:
isl6208aCBZ-T
Manufacturer:
INTERSIL
Quantity:
20 000
High Voltage Synchronous Rectified Buck
MOSFET Driver
The ISL6208A is a high frequency, dual MOSFET driver,
optimized to drive two N-Channel power MOSFETs in a
synchronous-rectified buck converter topology. It is
especially suited for mobile computing applications that
require high efficiency and excellent thermal performance.
This driver, combined with an Intersil multiphase Buck PWM
controller, forms a complete single-stage core-voltage
regulator solution for advanced mobile microprocessors.
The ISL6208A features 4A typical sinking current for the
lower gate driver. This current is capable of holding the lower
MOSFET gate off during the rising edge of the Phase node.
This prevents shoot-through power loss caused by the high
dv/dt of phase voltages. The operating voltage matches the
30V breakdown voltage of the MOSFETs commonly used in
mobile computer power supplies.
The ISL6208A also features a three-state PWM input that,
working together with Intersil’s multiphase PWM controllers,
will prevent negative voltage output during CPU shutdown.
This feature eliminates a protective Schottky diode usually
seen in a microprocessor power systems.
MOSFET gates can be efficiently switched up to 2MHz using
the ISL6208A. Each driver is capable of driving a 3000pF
load with propagation delays of 15ns and transition times
under 10ns. Bootstrapping is implemented with an internal
Schottky diode. This reduces system cost and complexity,
while allowing the use of higher performance MOSFETs.
Adaptive shoot-through protection is integrated to prevent
both MOSFETs from conducting simultaneously.
A diode emulation feature is integrated in the ISL6208A to
enhance converter efficiency at light load conditions. This
feature also allows for monotonic start-up into pre-biased
outputs. When diode emulation is enabled, the driver will
allow discontinuous conduction mode by detecting when the
inductor current reaches zero and subsequently turning off
the low side MOSFET gate. Programmable dead-time
control with gate threshold monitoring is also integrated to
prevent both MOSFETs from conducting simultaneously.
Related Literature
• Technical Brief TB363 “Guidelines for Handling and
• Technical Brief TB389 “PCB Land Pattern Design and
• Technical Brief TB447 “Guidelines for Preventing Boot-to-
Processing Moisture Sensitive Surface Mount Devices
(SMDs)”
Surface Mount Guidelines for MLFP Packages”
Phase Stress on Half-Bridge MOSFET Driver ICs”
®
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
• Adaptive Shoot-Through Protection
• 0.5Ω On-Resistance and 4A Sink Current Capability
• Supports High Switching Frequency up to 2MHz
• Three-State PWM Input for Power Stage Shutdown
• Internal Bootstrap Schottky Diode
• Low Bias Supply Current (5V, 100µA)
• Diode Emulation for Efficiency and Pre-Biased Startup
• VCC POR (Power-On-Reset) Feature Integrated
• Pin-to-pin Compatible with ISL6207, ISL6208, ISL6209
• QFN Package:
• Pb-Free Plus Anneal Available (RoHS Compliant)
Applications
• Supplies for Intel® and AMD® Mobile Microprocessors
• High Frequency, Low Profile DC/DC Converters
• High Current Low Output Voltage DC/DC Converters
• High Input Voltage DC/DC Converters
Ordering Information
NOTE: Intersil Pb-free plus anneal products employ special Pb-free
material sets; molding compounds/die attach materials and 100%
matte tin plate termination finish, which are 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.
ISL6208ACBZ
(Note)
ISL6208ACBZ-T
(Note)
ISL6208ACRZ
(Note)
ISL6208ACRZ-T
(Note)
PART NUMBER
- Active Gate Threshold Monitoring
- Programmable Dead-Time
- Fast Output Rise and Fall Time
- Low Propagation Delay
- Compliant to JEDEC PUB95 MO-220
- Near Chip Scale Package footprint, which improves
February 15, 2006
QFN - Quad Flat No Leads - Package Outline
PCB efficiency and has a thinner profile
All other trademarks mentioned are the property of their respective owners.
|
Intersil (and design) is a registered trademark of Intersil Americas Inc.
ISL6208ACBZ -10 to 100 8 Ld SOIC
ISL6208ACBZ 8 Ld SOIC Tape and Reel
08AZ
08AZ
MARKING
Copyright Intersil Americas Inc. 2006. All Rights Reserved
PART
(Pb-Free)
8 Ld 3x3 QFN Tape and Reel
(Pb-Free)
-10 to 100 8 Ld 3x3 QFN
RANGE
TEMP.
(°C)
ISL6208A
(Pb-Free)
(Pb-Free)
PACKAGE
FN9272.0
M8.15
L8.3x3
DWG.
PKG.
#

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isl6208a Summary of contents

Page 1

... This feature eliminates a protective Schottky diode usually seen in a microprocessor power systems. MOSFET gates can be efficiently switched up to 2MHz using the ISL6208A. Each driver is capable of driving a 3000pF load with propagation delays of 15ns and transition times under 10ns. Bootstrapping is implemented with an internal Schottky diode ...

Page 2

... SHOOT- THROUGH PROTECTION CONTROL LOGIC 10K THERMAL PAD (FOR QFN PACKAGE ONLY) FIGURE 1. BLOCK DIAGRAM 2. TSSHD t PDHL t FL ISL6208ACR (8 LD 3x3 QFN) TOP VIEW FCCM BOOT 1 6 PWM 2 5 VCC 3 4 BOOT UGATE PHASE VCC LGATE GND ...

Page 3

... FCCM Transient Delay SWITCHING TIME UGATE Rise Time (Note 5) LGATE Rise Time (Note 5) UGATE Fall Time (Note 5) 3 ISL6208A Thermal Information Thermal Resistance (Typical Notes θ SOIC Package (Note QFN Package (Notes 3, 4 -0. (DC) Maximum Junction Temperature (Plastic Package 150°C -0. (< ...

Page 4

... LGATE R 500mA Sink Current 2.5V L LGATE +5V V VCC BOOT UGATE FCCM PWM PHASE DRIVE ISL6208A LGATE THERMAL PAD +5V VCC BOOT FCCM UGATE PHASE DRIVE PWM ISL6208A LGATE THERMAL PAD MIN TYP MAX - 4 0Ω SET = 0Ω SET = 80kΩ SET = 80kΩ ...

Page 5

... MOSFET. This pin provides a return path for the upper gate driver. Description Theory of Operation Designed for speed, the ISL6208A dual MOSFET driver controls both high-side and low-side N-Channel FETs from one externally provided PWM signal. A rising edge on PWM initiates the turn-off of the lower MOSFET (see Timing Diagram) ...

Page 6

... Typical Performance Waveforms FIGURE 2. LOAD TRANSIENT (0 - 30A, 3-PHASE) FIGURE 4. DCM TO CCM TRANSITION AT NO LOAD FIGURE 6. PRE-BIASED STARTUP IN CCM MODE 6 ISL6208A FIGURE 3. LOAD TRANSIENT (30 - 0A, 3-PHASE) FIGURE 5. CCM TO DCM TRANSITION AT NO LOAD FIGURE 7. PRE-BIASED STARTUP IN DCM MODE FN9272.0 February 15, 2006 ...

Page 7

... The turn-OFF of the low side MOSFET can cause gross current measurement inaccuracies. Three-State PWM Input A unique feature of the ISL6208A and other Intersil drivers is the addition of a shutdown window to the PWM input. If the PWM signal enters and remains within the shutdown window for a set holdoff time, the output drivers are disabled and both MOSFET gates are pulled and held low ...

Page 8

... The maximum allowable IC power dissipation for the SO-8 package is approximately 800mW. When designing the driver into an application recommended that the following calculation be performed to ensure safe operation at the desired 8 ISL6208A as frequency for the selected MOSFETs. The power dissipated DELAY by the driver is approximated as: P ...

Page 9

... Quad Flat No-Lead Plastic Package (QFN) 9 ISL6208A L8.3x3 8 LEAD QUAD FLAT NO-LEAD PLASTIC PACKAGE (COMPLIANT TO JEDEC MO-220VEEC ISSUE C) MILLIMETERS SYMBOL MIN 0. θ - NOTES: 1. Dimensioning and tolerancing conform to ASME Y14.5-1994 the number of terminals. ...

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 ISL6208A M8.15 (JEDEC MS-012-AA ISSUE C) 8 LEAD NARROW BODY SMALL OUTLINE PLASTIC PACKAGE ...

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