Datasheet Linear Technology LT3581

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Application Notes

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  2-Wire Virtual Remote Sensing for Voltage Regulators - Clairvoyance Marries Remote Sensing &mdash AN126
  PDF, 1.4 Mb, File published: Oct 1, 2010
  Wires and connectors have resistance. This simple, unavoidable truth dictates that a power source’s remote load voltage will be less than the source’s output voltage. Traditional methods for countering this include increasing the power source voltage and "4-wire" remote voltage sensing. Both have limitations. A new IC based approach achieves "virtual" remote sensing at the load without adding the usual two extra sense wires. Numerous circuit examples show the IC working with various voltage regulators and remote loads. Appendices detail IC internal operation and design guidelines for applying the part in any regulator circuit.
  Extract from the document

  Application Note 126
  October 2010
  2-Wire Virtual Remote Sensing for Voltage Regulators
  Clairvoyance Marries Remote Sensing
  Jim Williams, Jesus Rosales, Kurk Mathews, Tom Hack
  Introduction
  Wires and connectors have resistance. This simple, unavoidable truth dictates that a power source’s remote load
  voltage will be less than the source’s output voltage. Figure 1
  shows this, and implies that intended load voltage can
  be maintained by raising regulator output. Unfortunately,
  line resistance and load variations introduce uncertainties,
  limiting achievable performance.
  WIRING DROPS POWER
  SUPPLY LOAD
  AN125 F01 WIRING DROPS Figure 1. Unavoidable Wiring Drops Cause Low Load
  Voltage. Line and Load Resistance Variations Introduce
  Additional Load Voltage Uncertainty, Mitigating Against
  Compensation by Raising Supply Voltage LOAD
  VOLTAGE
  REGULATOR POWER
  SUPPLY LOAD
  AN125 F02 Figure 2. Local Regulation Stabilizes
  Load Voltage But is Inefп¬Ѓcient VOUT+ VOLTAGE DROP Figure 2 illustrates one compensatory approach. Locally …

Articles

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  Two High Power Monolithic Switching Regulators Include Integrated 6A, 42V or 3.3A, 42V Power Switches &mdash LT Journal
  PDF, 1.8 Mb, File published: Jan 18, 2011
  Extract from the document

  Two High Power Monolithic Switching Regulators Include
  Integrated 6A, 42V or 3.3A, 42V Power Switches,
  Built-in Fault Protection and Operation up to 2.5MHz
  Matthew Topp and Joshua Moore Power supply designers looking to shrink applications and simplify layout often turn to
  monolithic switching regulators. Monolithics simplify power supply layout by including
  the power switch on the die—no external FETs or precision sense resistors are needed.
  Monolithics can also operate at substantially higher switching frequencies than their
  controller-only counterparts, thus reducing the size and number of external passive
  components. The benefits of monolithic regulators are clear, but they traditionally have one
  major limitation: as the required power level goes up, the likelihood of finding a suitable
  monolithic regulator diminishes. Two new high power monolithics, the LT3579 and LT3581,
  solve this problem by integrating 6A (42V) and 3.3A (42V) power switches, respectively.
  The LT3579 and LT3581 are highly flexible parts and can be configured in
  boost, SEPIC, inverting, or flyback configurations. They also offer many unique
  performance and fault protection features. When configured as high power
  boost converters, these parts can survive
  output overloads with only a few additional external components. They can
  also be configured to provide hot-plug
  and reverse input voltage protection.
  In addition, a novel master and slave
  power switch design allows high voltage
  charge pump circuits to be made with low
  power dissipation and few components. …

Model Line

Manufacturer's Classification

• Power Management > Switching Regulator > Inverting Regulators | LCD/CCD/OLED Bias | SEPIC Regulators | Flyback, Forward and Isolated Controllers
• Power Management > Switching Regulator > Step-Up (Boost) Regulators > Internal Power Switch Boost
• Space & Harsh Environment > Extended Temperature Plastic (H & MP) > Extended Temperature (H & MP) Switching Regulators