Overview

The ISL6840, ISL6841, ISL6842, ISL6843, and ISL6844 (ISL684x) family of adjustable frequency, low power, Pulse-Width Modulating (PWM) current mode controllers is designed for a wide range of power conversion applications including boost, flyback, and isolated output configurations. Peak current mode control effectively handles power transients and provides inherent overcurrent protection. This advanced BiCMOS design is pin-compatible with the industry standard 384x family of controllers and offers significantly improved performance. Features include low operating current, 60µA start-up current, adjustable operating frequency to 2MHz, and high peak current drive capability with 20ns rise and fall times.

ISL684x Functional Diagram
ISL684x Functional Diagram
  • 1A MOSFET gate driver
  • 60µA start-up current, 100µA maximum
  • 25ns propagation delay current sense to output
  • Fast transient response with peak current mode control
  • Adjustable switching frequency to 2MHz
  • 20ns rise and fall times with 1nF output load
  • Trimmed timing capacitor discharge current for accurate deadtime/maximum duty cycle control
  • High bandwidth error amplifier
  • Tight tolerance voltage reference over line, load, and temperature
  • Tight tolerance current limit threshold
  • Pb-free available (RoHS compliant)

Applications

  • Telecom and Datacom Power
  • Wireless Base Station Power
  • File Server Power
  • Industrial Power Systems
  • PC Power Supplies
  • Isolated Buck and Flyback Regulators
  • Boost Regulators

Documentation

Design & Development

ECAD Models

Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on products in the Product Options table. If a symbol or model isn't available, it can be requested directly from the website.

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Diagram of ECAD Models

Product Options

    Processing table
    Pkg. Type
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    Price (USD) | 1ku
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    Part Number
    ISL6840IBZ-T
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    		SOICN Reel 3 1.963 Get Samples,
    ISL6840IRZ-T
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    		DFN Reel 3 1.719 Get Samples,
    ISL6840IUZ
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    		MSOP Tube 1 Get Samples,
    ISL6840IUZ-T
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    		MSOP Reel 1 1.963
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