ISL6526AEVAL2

Manufacturer Part NumberISL6526AEVAL2
DescriptionEVALUATION BOARD 2 ISL6526A
ManufacturerIntersil
ISL6526AEVAL2 datasheet
 


Specifications of ISL6526AEVAL2

Main PurposeDC/DC, Step DownOutputs And Type1, Non-Isolated
Voltage - Output2.5VCurrent - Output5A
Voltage - Input3.3 ~ 5VRegulator TopologyBuck
Frequency - Switching600kHzBoard TypeFully Populated
Utilized Ic / PartISL6526ALead Free Status / RoHS StatusContains lead / RoHS non-compliant
Power - Output-  
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Data Sheet
Single Synchronous Buck Pulse-Width
Modulation (PWM) Controller
The ISL6526, ISL6526A make simple work out of
implementing a complete control and protection scheme for
a DC/DC stepdown converter. Designed to drive N-Channel
MOSFETs in a synchronous buck topology, the ISL6526,
ISL6526A integrate the control, output adjustment,
monitoring and protection functions into a single package.
The ISL6526, ISL6526A provide simple, single feedback
loop, voltage-mode control with fast transient response. The
output voltage can be precisely regulated to as low as 0.8V,
with a maximum tolerance of ±1.5% over-temperature and
line voltage variations. A fixed frequency oscillator reduces
design complexity, while balancing typical application cost
and efficiency.
The error amplifier features a 15MHz gain-bandwidth
product and 6V/µs slew rate which enables high converter
bandwidth for fast transient performance. The resulting
PWM duty cycles range from 0% to 100%.
Protection from overcurrent conditions is provided by
monitoring the r
of the upper MOSFET to inhibit PWM
DS(ON)
operation appropriately. This approach simplifies the
implementation and improves efficiency by eliminating the
need for a current sense resistor.
1
ISL6526, ISL6526A
November 24, 2008
Features
• Operates from 3.3V to 5V Input
• 0.8V to V
Output Range
IN
- 0.8V Internal Reference
- ±1.5% Over Load, Line Voltage and Temperature
• Drives N-Channel MOSFETs
• Simple Single-Loop Control Design
- Voltage-Mode PWM Control
• Fast Transient Response
- High-Bandwidth Error Amplifier
- Full 0% to 100% Duty Cycle
• Lossless, Programmable Overcurrent Protection
- Uses Upper MOSFET’s r
• Converter can Source and Sink Current
• Small Converter Size
- Internal Fixed Frequency Oscillator
- ISL6526: 300kHz
- ISL6526A: 600kHz
• Internal Soft-Start
• 14 Ld SOIC or 16 Ld 5x5 QFN
• QFN Package:
- Compliant to JEDEC PUB95 MO-220 QFN - Quad Flat
No Leads - Package Outline
- Near Chip Scale Package Footprint, which Improves
PCB Efficiency and has a Thinner Profile
• Pb-Free (RoHS Compliant)
Applications
• Power Supplies for Microprocessors
- PCs
- Embedded Controllers
• Subsystem Power Supplies
- PCI/AGP/GTL+ Buses
- ACPI Power Control
- DDR SDRAM Bus Termination Supply
• Cable Modems, Set-Top Boxes, and DSL Modems
• DSP and Core Communications Processor Supplies
• Memory Supplies
• Personal Computer Peripherals
• Industrial Power Supplies
• 3.3V-Input DC/DC Regulators
• Low-Voltage Distributed Power Supplies
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. 2001-2005, 2007, 2008. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
FN9055.10
DS(on)

ISL6526AEVAL2 Summary of contents

  • Page 1

    ... CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. | 1-888-INTERSIL or 1-888-468-3774 Intersil (and design registered trademark of Intersil Americas Inc. Copyright © Intersil Americas Inc. 2001-2005, 2007, 2008. All Rights Reserved. All other trademarks mentioned are the property of their respective owners. FN9055.10 DS(on) ...

  • Page 2

    ... ISL6526EVAL2 ISL6526 QFN Evaluation Board ISL6526AEVAL1 ISL6526A SOIC Evaluation Board ISL6526AEVAL2 ISL6526A QFN Evaluation Board *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 ...

  • Page 3

    Typical Application - 3.3V Input 3. PUMP DISABLE Typical Application - 5V Input + N/C DISABLE 3 ISL6526, ISL6526A VCC OCSET CT1 CPVOUT ISL6526, ISL6526A D BOOT CT2 BOOT CPGND C BOOT UGATE ...

  • Page 4

    Block Diagram VCC CT1 CHARGE PUMP CT2 CPGND OCSET 20µ COMP 4 ISL6526, ISL6526A CPVOUT POWER-ON RESET (POR) + SOFT-START - OC COMPARATOR PWM ERROR COMPARATOR AMP + + - - PWM OSCILLATOR FIXED 300kHz OR ...

  • Page 5

    ... ISL6526, ISL6526A Thermal Information Thermal Resistance SOIC Package (Note +7.0V QFN Package (Notes 2, 3 Maximum Junction Temperature . . . . . . . . . . . . . . . . . . . . . +150°C Maximum Storage Temperature Range . . . . . . . . . .-65°C to +150°C Pb-Free Reflow Profile .see link below http://www.intersil.com/pbfree/Pb-FreeReflow.asp SYMBOL TEST CONDITIONS I BIAS POR Commercial Industrial f ...

  • Page 6

    Electrical Specifications Recommended Operating Conditions, unless otherwise noted V PARAMETER GATE DRIVERS Upper Gate Source Current Upper Gate Sink Current Lower Gate Source Current Lower Gate Sink Current PROTECTION/DISABLE OCSET Current Source Disable Threshold NOTE: 4. Limits should be considered ...

  • Page 7

    ENABLE This pin is the open-collector enable pin. Pulling this pin to a level below 0.8V will disable the controller. Disabling the ISL6526, ISL6526A causes the oscillator to stop, the LGATE and UGATE outputs to be held low, and the ...

  • Page 8

    VIN VCC CPVOUT D1 BOOT C4 Q1 UGATE ISL6526, L ISL6526A PHASE Q2 LGATE FB C1 COMP C2 R2 FIGURE 2. OUTPUT VOLTAGE SELECTION Overcurrent Protection The overcurrent function protects the converter from a shorted output by using the ...

  • Page 9

    This situation will allow the voltage level of the input rail to increase. If the ...

  • Page 10

    PHASE node. The PWM wave is smoothed by the output filter (L and The modulator transfer function is the small-signal transfer function This function is dominated OUT E/A ...

  • Page 11

    Component Selection Guidelines Charge Pump Capacitor Selection A capacitor across pins CT1 and CT2 is required to create the proper bias voltage for the ISL6526, ISL6526A when operating the IC from 3.3V. Selecting the proper capacitance value is important so ...

  • Page 12

    The RMS current rating requirement for the input capacitor of a buck regulator is approximately 1/2 the DC load current. The maximum RMS current required by the ...

  • Page 13

    ... ISL6526, ISL6526A DC/DC Converter Application Circuit Figure 8 shows an application circuit of a DC/DC Converter. is BOOT1 Detailed information on the circuit, including a complete Bill of Materials and circuit board description, can be found in Application Note AN1021: http://www.intersil.com/data/an/an1021.pdf 0.1µ VCC 6 OCSET CT1 ...

  • Page 14

    Package Outline Drawing L16.5x5B 16 LEAD QUAD FLAT NO-LEAD PLASTIC PACKAGE Rev 2, 02/08 5.00 6 PIN 1 INDEX AREA (4X) 0.15 TOP VIEW ( TYP ) ( TYPICAL RECOMMENDED LAND PATTERN 14 ...

  • Page 15

    ... Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. 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 ...