Description

The LX7180A is a 4A step-down regulator with integrated MOSFETs packaged in a space saving QFN12 2 mm x 2 mm for today’s mobile devices. It uses an ultra-fast, constant frequency hysteretic control method to minimize external filter components while maintaining excellent regulation. The LX7180A reference voltage is programmable from 0.6 V to 1.195 V through a high speed (up to 3.4 MHz), bi-directional I2C bus.

The LX7180 operates from 3 V to 5.5 V rails and outputs 0.6 V to 100 of the input voltage.

Cycle-by-cycle current limiting protects against over-current conditions. Hiccup mode provides protection for heavy over-load or short-circuit faults. Thermal protection shuts down the regulator under over-temperature conditions. Over voltage conditions will immediately shut off the output to protect against permanent damage. The LX7180A automatically restarts when all fault conditions are cleared.

Features

? 0-4 A Step-down Regulator

? Operational Input Supply Voltage Range: 3.0 V - 5.5 V (short durations to 6.5 V)

? Hysteretic Control Offers Best Transient Response

? PWM Switching at a Constant 1.65 MHz

? Power Save Mode (PSM) can be Selected to Improve Light Load Efficiency.

? 100 Duty Ratio Operation

? Input Under Voltage and Over Voltage Protection

? Enable and Power Good Function

? I2C Serial Interface at 3.4 Mbps

? Internal Soft-start

? Cycle-by-Cycle Over Current Protection

? Hiccup Mode Protects Against Short Circuit Faults

? Seven Bit Adjustable Reference Voltage via I2C Bus

? RoHS Compliant

Applications

? High Performance HDD

? LCD TV

? Notebook/Netbook

? Server and Workstations

? Video Cards

? PoE Powered Devices Smart Phone