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ISL8500

Obsolete

2A Standard Buck PWM Regulator

Alternative(s) Available
ISL85003 - Highly Efficient 3A Synchronous Buck Regulator

Features

  • Standard Buck Controller with Integrated Switching Power MOSFET
  • Integrated Boot Diode
  • Input Voltage Range
  • Fixed 5V ±10%
  • Variable 5.5V to 25V
  • PWM Output Voltage Adjustable from 0.6V to 19V with Continuous Output Current up to 2A
  • ±1% VFB Tolerance
  • Voltage Mode Control with Voltage Feed Forward
  • Fixed 500kHz Switching Frequency
  • Externally Adjustable Soft-Start Time
  • Output Undervoltage Protection
  • Enable Inputs
  • PGOOD Output
  • Overcurrent Protection
  • Thermal Overload Protection
  • Internal 5V LDO regulator
ISL8500 Functional Diagram
ISL8500 Functional Diagram

Description

The ISL8500 is a high-performance, simple output controller that provides a single, high frequency power solution for a variety of point-of-load applications. The ISL8500 integrates a 2A standard buck PWM controller and switching MOSFET. The PWM controller in the ISL8500 drives an internal switching N-Channel power MOSFET and requires an external Schottky diode to generate an output voltage from 0.6V to 19V. The integrated power switch is optimized for excellent thermal performance up to 2A of output current. The standard buck input voltage range supports a fixed 5V or variable 5.5V to 25V range. The PWM regulator switches at a fixed frequency of 500kHz and utilizes simple voltage mode control with input voltage feed forward to provide flexibility in component selection and minimize solution size. Protection features include overcurrent, undervoltage and thermal overload protection integrated into the IC. The ISL8500 power good signal output indicates loss of regulation on the PWM output. ISL8500 is available in a small 4mm x 3mm Dual Flat No-Lead (DFN) package.

Applications

  • General Purpose
  • WLAN Cards-PCMCIA, Cardbus32, MiniPCI Cards-Compact Flash Cards
  • Hand-Held Instruments
  • LCD Panel
  • Set-top Box
Part NumberStatusSamplesStockRoHSPackageCarrier Type
ISL8500IRZObsoleteN/AIn StockRoHS:EN
DFNTube
ISL8500IRZ-TObsoleteN/AOut of StockRoHS:EN
DFNReel
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    Recommended Documents (1)

  1. Datasheet
    ISL8500 Datasheet
    RECOMMENDED
    PDF 1.03 MB isl8500 Feb 27, 2001

    Datasheets (1)

  1. Datasheet
    ISL8500 Datasheet
    RECOMMENDED
    PDF 1.03 MB isl8500 Feb 27, 2001

    Manuals & Guides (2)

  1. Manual - Development Tools
    ISL59605-Catx-EVZ User Guide
    PDF 564 KB an1780 Oct 13, 2010
  2. Manual - Development Tools
    ISL59603-Coax-EVZ User Guide
    PDF 556 KB an1776 Oct 13, 2010

    Application Notes & White Papers (6)

  1. Application Note
    AN9208: High Frequency Power Converters
    PDF 592 KB an9208 Feb 01, 2018
    AI-generated Summary: The document discusses high frequency power converters, focusing on ZVS-QRC and multi-resonant topologies that reduce switching losses by operating switches at zero voltage. It highlights challenges like EMI and high voltage stress. The SEPIC converter is introduced, explaining its ability to buck or boost voltage without polarity inversion. The document details SEPIC’s operating modes, voltage-current relationships, and the importance of inductor values for continuous or discontinuous conduction modes.
  2. Application Note
    AN1684: Nonideality of Ground
    PDF 397 KB an1684 Jan 19, 2004
    AI-generated Summary: The document outlines important legal disclaimers and usage guidelines for semiconductor products. It emphasizes user responsibility for product design and safety, disclaims liability for damages, and clarifies no intellectual property licenses are granted. Products are categorized by quality grades with specific application recommendations. Users must comply with laws, avoid unauthorized modifications, and ensure safe use within specified conditions. Contact details for Renesas Electronics sales offices worldwide are provided.
  3. Application Note
    AN1681: Grounding Techniques
    PDF 509 KB an1681 Jan 19, 2004
    AI-generated Summary: The document explains grounding techniques for PCB layouts using a dual op amp example on a single-layer copper board. It compares three grounding schemes: a center spine ground trace, an outer ground plane, and a split/star ground plane, highlighting the benefits of single-point grounding to minimize noise and antenna effects. It emphasizes following current paths, minimizing loop lengths, and ensuring close forward and return paths to reduce interference. The document also includes disclaimers on product use, quality grades, safety, and legal compliance.
  4. Application Note
    AN9210: A New Pspice Subcircuit For The Power MOSFET Featuring Global Temperature Options
    PDF 650 KB an9210 Dec 21, 2001
    AI-generated Summary: This document presents a new PSPICE subcircuit model for power MOSFETs with global temperature options. It details synchronous rectifier circuit operation, including gate biasing and conduction modes. The model accurately simulates switching waveforms, diode recovery, and temperature-dependent efficiency. Measured and modeled data show excellent correlation for output characteristics, threshold voltage, breakdown voltage, and on-resistance across temperature ranges. Limitations in linear mode modeling are noted due to PSPICE assumptions.
  5. Application Note
    AN9209: A Spice-2 Subcircuit Representation For Power MOSFETs Using Empirical Methods
    PDF 387 KB an9209 Aug 13, 1998
    AI-generated Summary: The document presents an empirical SPICE-2 subcircuit model for power MOSFETs, accurately simulating static and dynamic behaviors including first and third-quadrant operations and avalanche breakdown. The model aligns closely with measured data and is compatible with all SPICE versions without code modification. It uses parameters derived from datasheets or simple measurements. The document also includes detailed comparisons of measured and calculated curves for transfer, output, switching, and diode recovery characteristics. Additionally, it provides legal and usage disclaimers from Renesas Electronics.
    6. View More (6)
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Simulation Models

    Software & Tools (1)

  1. Simulator
    iSim:PE Offline Simulation Tool
    iSim Personal Edition (iSim:PE) speeds the design cycle and reduces risk early in any project, identifying parts that can be used in current as well as next-generation designs.

    Simulation Models (1)

  1. Model - iSim
    ISL8500 iSim:PE Model
    Log in to Download SXSCH 227 KB SI100004 Mar 25, 2021
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Support Communities

  1. ISL85003A

    Anyone used this buck convertor, I cannot get it to regulate. output should be (set for) 0.9V. I get 1V off load and 0.77V full load (3A) I am thinking the problem is layout?   Jessica

    Aug 6, 2019

Knowledge Base

  1. What advantage does switching between CCM and DCM have?

    Question: What advantage does switching between continuous conduction mode (CCM) and discontinuous conduction mode (DCM) have?   Answer: Switching from CCM to DCM will improve the efficiency at light loads. For example, our ISL85003 can automatically switch between DCM and CCM for light load efficiency in DCM. Its fast transition between ...

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