Features

• Sub Milliohm DCR Current Sensing
• High Efficiency: Up to 95%
• Selectable Current Sensing Limit
• Programmable DCR Temperature Compensation
• Die Overtemperature Thermal Shutdown
• ± 0.5% 0.6V Output Voltage Accuracy
• Programmable Fixed Frequency 250kHz to 770kHz
• High Speed Differential Remote Sense Amplifier
• Wide Input Voltage Range: 4.5V to 38V
• Output Voltage Range: 0.6V to 3.5V with Diffamp
• Adjustable Soft-Start or Output Voltage Tracking
• Foldback Output Current Limit
• Short-Circuit Soft Recovery
• Output Overvoltage Protection
• 24-Lead (4mm × 4mm) QFN and 24-Lead FE Packages

Typical Application

Description

The LTC®3866 is a single phase current mode synchronous step-down switching regulator controller that drives all N-channel power MOSFET switches. It employs a unique architecture which enhances the signal-to-noise ratio of the current sense signal, allowing the use of a very low DC resistance power inductor to maximize the efficiency in high current applications. This feature also reduces the switching jitter commonly found in low DCR applications. The LTC3866 also includes a high speed remote sense differential amplifier, a programmable current sense limit that can be selected to 10mV, 15mV, 20mV, 25mV or 30mV, and DCR temperature compensation to limit the maximum output current precisely over temperature.

The LTC3866 also features a precise 0.6V reference with a guaranteed limit of ±0.5% that provides an accurate output voltage from 0.6V to 3.5V. A 4.5V to 38V input voltage range allows it to support a wide variety of bus voltages and various types of batteries.

The LTC3866 is offered in a low profile 24-lead 4mm × 4mm QFN and 24-lead exposed pad FE packages.