DESCRIPTION

The LX1684 is a monolithic, voltage mode pulse-width modulator controller. It is designed to implement a flexible, low cost buck (step-down) regulator supply with a minimal of external components.

KEY FEATURES

▪ Fixed 175kHz Switching Frequency

▪ Constant Frequency Voltage

Mode Control Requires No External Compensation

▪ Hiccup-Mode Over-Current Protection

▪ High Efficiency

▪ Output Voltage Set By Resistor Divider

▪ Under-Voltage Lockout

▪ Soft-Start And Enable

▪ Synchronous Rectification

▪ Small, 14-pin Surface Mount Package

APPLICATIONS

▪ 12V to 3.3V Or Less Buck Regulators

▪ 3.3/5V to 2.5V Or Less Buck Regulators

▪ Hard Disk Drives

▪ Computer Add-on Cards