LTC3866 - Current Mode Synchronous Controller for Sub Milliohm DCR Sensing

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.

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

Applications
  • Computer Systems
  • Telecom Systems
  • Industrial and Medical Instruments
  • DC Power Distribution Systems
Packaging

Order Information
Part NumberPackageTempPrice(1-99)Price (1k)*
LTC3866EFE#PBFTSSOP-24E$4.26$2.98
LTC3866EFE#TRPBFTSSOP-24E$3.04
LTC3866EUF#PBF4x4 QFN-24E$3.87$2.71
LTC3866EUF#TRPBF4x4 QFN-24E$2.77
LTC3866IFE#PBFTSSOP-24I$4.96$3.47
LTC3866IFE#TRPBFTSSOP-24I$3.53
LTC3866IUF#PBF4x4 QFN-24I$4.26$2.98
LTC3866IUF#TRPBF4x4 QFN-24I$3.04
Demo Boards
Part NumberDescriptionPrice
DC1829ALTC3866EUF Demo Board VIN = 4.5V to 14V, VOUT = 1.5V @ 30A$150.00
Datasheet
Reliability Data
LT Journal
Press Release
Ad
LTspice
LTpowerCAD
Related Product
LTC3866 - Current Mode Synchronous Controller for Sub Milliohm DCR Sensing
LTC3866 Package Drawing LTC3866
R526 - Reliability Data
Current Mode Switching Supply with Ultralow Inductor DCR Sensing for High Efficiency and High Reliability
以超低电感器 DCR 采样的电流模式开关电源实现高效率和高可靠性
同步降压型控制器利用 mΩ 以下的 DCR 检测提供真正的电流模式控制
LTC3866 Footprints and Symbols
Sub 0.2 OHM DCR Sensing Current Mode Controller
LTC3866 Demo Circuit - High Efficiency 12V Input, 5V/25A Step-Down Converter (12V to 5V @ 25A)
LTC3866 Demo Circuit - High Efficiency, Synchronous Step-Down Converter with Sub mΩ Inductor DCR Sensing (4.5-20V to 1.5V @ 30A)
LTC3866 Project - High Efficiency, Synchronous Step-Down Controller with Sub mΩ Inductor DCR Sensing (4.5-14V to 1.5 @ 30A)