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LM3687 Datasheet Step-Down DC-DC Converter

Manufacturer: Texas Instruments

General Description

The LM3687 is a step-down DC-DC converter with an integrated low dropout Linear Regulator optimized for powering ultra-low voltage circuits from a single Li-Ion cell or 3 cell NiMH/NiCd batteries.

It provides a dual output with fixed output voltages and combined load current up to 750mA in post regulation mode or 1100mA in independent mode of operation, over an input voltage range from 2.7V to 5.5V.

There are several different fixed output voltage combinations available (refer to Voltage Options).

Overview

LM3687 www.ti.com SNVS473B – DECEMBER 2007 – REVISED MAY 2013 LM3687 Step-Down DC-DC Converter with Integrated Low Dropout Regulator and Startup Mode Check for Samples:.

Key Features

  • 1 2DC-DC Converter:.
  • 750mA Maximum Load Capability.
  • 1.8MHz PWM Fixed Switching Frequency (Typ. ).
  • Automatic PFM/PWM Mode Switching.
  • 27µA typ. Quiescent Current.
  • Internal Synchronous Rectification for High Efficiency.
  • Internal Soft Start Dual Rail Linear Regulator:.
  • Startup Mode.
  • Load Transients < 25mVpeak Typ.
  • Line Transients < 1mVpeak Typ.
  • Very Low Dropout Voltage: 82mV Typ. at 350mA Load Current.