LM3686

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 3.3 V – 50-µA Typical IQ and 350-mA Maximum ILOAD Combined Global Features – VBATT ≥ Maximum (VOUT_LILO + 1.5 V, 2.7 V) – Operates From a Single Li-Ion Cell or 3-Cell NiMH/NiCd Batteries – 100-µA IQ and 900-mA Maximum ILOAD 2 Applications Mobile TVs, Hand-Held Radios Personal Digital Assistants, Palm-Top PCs Portable Instruments and Personal Clients Battery-Powered Devices 3 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. The device offers superior featur...