LT1577

PRODUCTION

Ultrafast Transient Response, Low Dropout Regulators Adjustable and Fixed

Data Sheet Product Selection Table
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Overview

  • UltraFast™ Transient Response Eliminates Tantalum and Electrolytic Output Capacitors
  • FET RDS(ON) Defines Dropout Voltage
  • 1% Reference/Output Voltage Tolerance Over Temperature
  • Typical Load Regulation: 1mV
  • High Side Sense Current Limit
  • Multifunction Shutdown Pin with Latch off

The LT1575/LT1577 are single/dual controller ICs that drive low cost external N-channel MOSFETs as source followers to produce ultrafast transient response, low dropout voltage regulators.

The LT1575/LT1577 achieve unprecedented transient-load performance by eliminating expensive tantalum or bulk electrolytic output capacitors in the most demanding modern microprocessor applications. Precision-trimmed adjustable and fixed output voltage versions accommodate any required microprocessor power supply voltage. Selection of the N-channel MOSFET RDS(ON) allows very low dropout voltages to be achieved.

Unique protection features include a high side current limit amplifier that activates a fault protection timer circuit. A multifunction Shutdown pin provides either current limit time-out with latch off, over-voltage protection, thermal shutdown or a combination of these functions. The LT1575 is available in 8-pin SO or PDIP and the LT1577 is available in 16-pin narrow body SO.

Applications

  • Pentium® Processor Supplies
  • PowerPC™ Supplies
  • 5V to 3.XXV or 3.3V to 2.XXV Microprocessor Supplies
  • GTL Termination
  • Low Voltage Logic Supplies
LT1577
Ultrafast Transient Response, Low Dropout Regulators Adjustable and Fixed
Ultrafast Transient Response 5V to 3.3V Low Dropout Regulator (For Schematic Including Current Limit, See Typical Applications) Transient Response for 0.2A to 5A Output Load Step Product Package 1 Product Package 2 Product Package 3 Product Package 4 Product Package 5
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Documentation

Data Sheet 1

Reliability Data 1

Application Note 2

Design Note 1

Data Sheet

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Software Resources

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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

  • LT1577-2.8
  • LT1577-3.3
  • LT1577-ADJ
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.

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