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LM3686 - Step-Down DC-DC Converter

General Description

The LM3686 is a step-down DC-DC converter with a very low-dropout linear regulator and a low-noise linear regulator optimized for powering ultra-low voltage circuits.

It provides three outputs with combined load current up to 900 mA over an input voltage range from 2.7 V to 5.5 V.

Key Features

  • 1 DC-DC Regulator.
  • VOUT_DCDC = 1.2 V to 2.5 V.
  • 600-mA Maximum ILOAD.
  • 3-MHz Typical PWM Fixed Switching Frequency.
  • Automatic PFM/PWM Mode Switching.
  • Internal Synchronous Rectification.
  • Internal Soft Start.
  • Dual-Rail Linear Regulator: LILO.
  • Load Transients < 50-mV Peak Typical.
  • Line Transients < 1-mV Peak Typical.
  • VOUT_LILO = 0.7 V to 2 V.
  • 70-µA Typical IQ and 300-mA Maximum ILOAD.

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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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Product Folder Sample & Buy Technical Documents Tools & Software Support & Community LM3686 SNVS520F – AUGUST 2008 – REVISED NOVEMBER 2016 LM3686 Step-Down DC-DC Converter With Integrated Post Linear Regulators System And Low-Noise Linear Regulator 1 Features •1 DC-DC Regulator – VOUT_DCDC = 1.2 V to 2.5 V – 600-mA Maximum ILOAD – 3-MHz Typical PWM Fixed Switching Frequency – Automatic PFM/PWM Mode Switching – Internal Synchronous Rectification – Internal Soft Start • Dual-Rail Linear Regulator: LILO – Load Transients < 50-mV Peak Typical – Line Transients < 1-mV Peak Typical – VOUT_LILO = 0.7 V to 2 V – 70-µA Typical IQ and 300-mA Maximum ILOAD • Linear Regulator: LDO – Load Transients < 80-mV Peak Typical – Line Transients < 1-mV Peak Typical – VOUT_LDO = 1.5 V to 3.