LM3678 - Texas Instruments

LM3678 High-Performance Miniature 1.5-A Step-Down DC-DC Converter

The LM3678 step-down DC-DC converter is optimized for powering low-voltage circuits from a single Li-Ion cell battery and input voltage rails from 2.5 V to 5.5 V. It provides up to 1.5-A load current, over the entire input voltage range. LM3678 offers a 0.8V or 1.2V option. One of the pair of voltages is set through the VSELECT pin. LM3678 operates in PWM mo.

Features

1
•2 VOUT = 0.8 V or 1.2 V
• VIN = 2.5 V to 5.5 V
• 1.5-A Maximum Load Capability
• 3.3-MHz (Typical) PWM Fixed Switching Frequency Allows Use of 1-µH Inductor
• ±3% DC Output Voltage Precision
• 0.01-µA (Typical) Shutdown Current
• Internal Synchronous Rectification for High Efficiency
• Internal Soft Start
• Current Overload and Thermal Shutdown Protection APPLICATIONS
• PDAs and Smart Phones
• Personal Media Players
• W-LAN
• USB Modem Applications
• Digital Still Cameras
• Portable Hard Disk Drives DESCRIPTION The LM3678 step-down DC-DC converter is optimized for powering low-voltage circ.