LTC1553L

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5-Bit Programmable Synchronous Switching Regulator Controller for Pentium® II Processor

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Overview

  • 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 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 2O-Lead SSOP and SW Packages

The LTC1553L is a high power, high efficiency switching regulator controller optimized for a 5V 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 LTC1553L 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 LTC1553L 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 to 1.8V-3.5V Regulators
LTC1553L
5-Bit Programmable Synchronous Switching Regulator Controller for Pentium® II Processor
Product Package 1 Figure 1. 5V to 1.8V-3.5V Supply Application
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Documentation

Data Sheet 1

Reliability Data 1

Data Sheet

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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

  • LTC1553
  • LTC1553L
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