Overview

Features and Benefits

  • 5-Bit Digitally Programmable 1.8V to 3.5V Fixed Output Voltage
  • Provides All Features Required by the Intel Pentium® II Processor VRM 8.2 DC/DC Converter Specification
  • Flags for Power Good, Over-Temperature and Overvoltage Fault
  • 19A Output Current Capability from a 5V or 12V Supply
  • Dual N-Channel MOSFET Synchronous Driver
  • Initial Output Accuracy: ±1.5%
  • Excellent Output Accuracy: ±2% Typ Over Line, Load and Temperature Variations
  • High Efficiency: Over 95% Possible
  • Adjustable Current Limit Without External Sense Resistors
  • Fast Transient Response
  • Available in 20-Lead SSOP and SW Packages

Product Details

The LTC1553 is a high power, high efficiency switching regulator controller optimized for 5V or 12V input to 1.8V-3.5V output applications. It features a digitally programmable output voltage, a precision internal reference and an internal feedback system that provides output accuracy of ±1.5% at room temperature and typically ±2% over-temperature, load current and line voltage shifts. The LTC1553 uses a synchronous switching architecture with two external N-channel output devices, providing high efficiency and eliminating the need for a high power, high cost P-channel device. Additionally, it senses the output current across the on-resistance of the upper N-channel FET, providing an adjustable current limit without an external low value sense resistor.

The LTC1553 free-runs at 300kHz and can be synchronized to a faster external clock if desired. It includes all the inputs and outputs required to implement a power supply conforming to the Intel Pentium® II Processor VRM 8.2 DC/DC Converter Specification.

Applications

  • Power Supply for Pentium II, SPARC, ALPHA and PA-RISC Microprocessors
  • High Power 5V or 12V to 1.8V-3.5V Regulators

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Tools & Simulations

LTspice

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

LTspice

Models for the following parts are available in LTspice:

LTC1553
LTC1553L

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

Sample & Buy

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The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


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