LM3673

Product Folder Sample & Buy Technical Documents Tools & Software Support & Community LM3673 SNVS434M – JULY 2006 – REVISED NOVEMBER 2016 LM3673 2-MHz, 350-mA Step-Down DC-DC Converter 1 Features 1 16-µA Typical Quiescent Current 350-mA Maximum Load Capability 2-MHz PWM Fixed Switching Frequency (Typical) Automatic PFM/PWM Mode Switching Available in Fixed and Adjustable Output Voltages Internal Synchronous Rectification for High Efficiency Internal Soft Start 0.01-µA Typical Shutdown Current Operates From a Single Li-Ion Cell Battery Current Overload and Thermal Shutdown Protection Only Three Tiny Surface-Mount External Components Required (One Inductor, Two Ceramic Capacitors) 2 Applications Mobile Phones PDAs MP3 Players W-LAN Portable Instruments Digital Still Cameras Portable Hard Disk Drives 3 Description The LM3673 step-down DC-DC converter is optimized for powering low voltage circuits from a single Li-Ion cell battery and input voltage rails from 2.7 V to 5.5 V. It provides up to 350-mA load current over the entire input voltage range. There are several different fixed voltage output options available, as well as an adjustable output voltage version ranging from 1.1 V to 3.3 V. The device offers superior features and performance for mobile phones and similar portable systems. The LM3673 uses intelligent automatic switching between pulse width modulation (PWM) and pulse frequency modulation (PFM) for better efficiency. During P...