• 16-µA Typical Quiescent Current
• 600-mA Maximum Load Capability
• 2-MHz PWM Fixed Switching Frequency (Typ.)
• Automatic PFM/PWM Mode Switching
• Internal Synchronous Rectification for High Efficiency
• Internal Soft Start
• 0.01-µA Typical Shutdown Current
• Operates from a Single Li-Ion Cell Battery
• Only Three Tiny Surface-Mount External Components Required (One Inductor, Two Ceramic Capacitors)
• Current Overload and Thermal Shutdown Protection
• Available in Fixed Output Voltages and Adjustable Version
• LM3671-Q1 is an AEC-Q100 Grade 1 Qualified Automotive Grade Product

• Mobile Phones
• PDAs
• MP3 Players
• W-LAN
• Portable Instruments
• Digital Still Cameras
• Portable Hard Disk Drives
• Automotive

The LM3671 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 600-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 range from 1.1 V to 3.3 V.

The device offers superior features and performance for mobile phones and similar portable systems. Automatic intelligent switching between PWM low-noise and PFM low-current mode offers improved system control. During PWM mode, the device operates at a fixed-frequency of 2 MHz (typ.). Hysteretic PFM mode extends the battery life by reducing the quiescent current to 16 µA (typ.) during light load and standby operation. Internal synchronous rectification provides high efficiency during PWM mode operation. In shutdown mode, the device turns off and reduces battery consumption to 0.01 µA (typ.).

A high-switching frequency of 2 MHz (typ.) allows use of tiny surface-mount components. Only three external surface-mount components, an inductor, and two ceramic capacitors, are required.