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LM2638 - Motherboard Power Supply Solution

General Description

The LM2638 provides a comprehensive embedded power supply solution for motherboards hosting high performance MPUs such as Pentium™ II, M II™, K6™-2 and other similar high performance MPUs.

Key Features

  • 1.
  • 2345 Provides 3 regulated voltages.
  • Power Good flag and output enable.
  • Charge pump pin.
  • Switching Section.
  • Synchronous rectification.
  • 5-bit DAC programmable down to 1.3V.
  • Typical ±1% DAC tolerance.
  • Switching frequency: 50 kHz to 1 MHz.
  • Over-voltage protection.
  • Two methods of over-current protection.
  • Adaptive non-overlapping FET gate drives.
  • Soft start without external capacitor.

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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OBSOLETE LM2638 www.ti.com SNVS046A – MAY 2004 – REVISED NOVEMBER 2004 LM2638 Motherboard Power Supply Solution with a 5-Bit Programmable Switching Controller and Two Linear Regulator Controllers Check for Samples: LM2638 FEATURES 1 •2345 Provides 3 regulated voltages • Power Good flag and output enable • Charge pump pin – Switching Section • Synchronous rectification • 5-bit DAC programmable down to 1.3V • Typical ±1% DAC tolerance • Switching frequency: 50 kHz to 1 MHz • Over-voltage protection • Two methods of over-current protection • Adaptive non-overlapping FET gate drives • Soft start without external capacitor – Linear Section • N-FET and NPN drive capability • Ultra fast response speed • Under voltage latch-off at 0.63V • Output voltages default to 1.5V and 2.