Products
LTC3866
RECOMMENDED FOR NEW DESIGNSCurrent Mode Synchronous Controller for Sub Milliohm DCR Sensing
- Part Models
- 8
- 1ku List Price
- Starting From $3.75
Viewing:
Overview
- 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
The LTC3866 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.
Applications
- Computer Systems
- Telecom Systems
- Industrial and Medical Instruments
- DC Power Distribution Systems
Documentation
Data Sheet 1
User Guide 1
Application Note 1
Technical Articles 2
Video 2
Solutions Bulletin & Brochure 1
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| LTC3866EFE#PBF | 24-Lead TSSOP w/ EP | ||
| LTC3866EFE#TRPBF | 24-Lead TSSOP w/ EP | ||
| LTC3866EUF#PBF | 24-Lead QFN (4mm x 4mm x 0.75mm w/ EP) | ||
| LTC3866EUF#TRPBF | 24-Lead QFN (4mm x 4mm x 0.75mm w/ EP) | ||
| LTC3866IFE#PBF | 24-Lead TSSOP w/ EP | ||
| LTC3866IFE#TRPBF | 24-Lead TSSOP w/ EP | ||
| LTC3866IUF#PBF | 24-Lead QFN (4mm x 4mm x 0.75mm w/ EP) | ||
| LTC3866IUF#TRPBF | 24-Lead QFN (4mm x 4mm x 0.75mm w/ EP) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Feb 14, 2025 - 25_0016 Bond Wire Change from Gold to Copper Wire (Notification Only) |
||
| LTC3866EFE#PBF | PRODUCTION | |
| LTC3866EFE#TRPBF | PRODUCTION | |
| LTC3866EUF#PBF | PRODUCTION | |
| LTC3866EUF#TRPBF | PRODUCTION | |
| LTC3866IFE#PBF | PRODUCTION | |
| LTC3866IFE#TRPBF | PRODUCTION | |
|
Apr 6, 2022 - 22_0068 Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL |
||
| LTC3866EFE#PBF | PRODUCTION | |
| LTC3866EFE#TRPBF | PRODUCTION | |
| LTC3866IFE#PBF | PRODUCTION | |
| LTC3866IFE#TRPBF | PRODUCTION | |
|
Jan 20, 2022 - 21_0269 Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products |
||
| LTC3866EUF#PBF | PRODUCTION | |
| LTC3866EUF#TRPBF | PRODUCTION | |
| LTC3866IUF#PBF | PRODUCTION | |
| LTC3866IUF#TRPBF | PRODUCTION | |
|
Apr 9, 2025 - 25_0016 Bond Wire Change from Gold to Copper Wire (Notification Only) |
||
| LTC3866IUF#PBF | PRODUCTION | |
| LTC3866IUF#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
Can't find the software or driver you need?
Request a Driver/SoftwareHardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| Circuit Monitors 1 | ||
| LTC2960 | RECOMMENDED FOR NEW DESIGNS | 36V Nano-Current Two-Input Voltage Monitor |
| Power System Management (PSM) & Sequencers 1 | ||
| LTC2974 | RECOMMENDED FOR NEW DESIGNS | 4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement |
| Protection Switches & Controllers 1 | ||
| LT4363 | RECOMMENDED FOR NEW DESIGNS | High Voltage Surge Stopper with Current Limit |
| Switching Regulators & Controllers 1 | ||
| LTC3880 | RECOMMENDED FOR NEW DESIGNS | Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management |
Tools & Simulations
LTspice 2
- LTC3866 Demo Circuit - High Efficiency, Synchronous Step-Down Converter with Sub mΩ Inductor DCR Sensing (4.5-20V to 1.5V @ 30A)
- LTC3866 Demo Circuit - High Efficiency 12V Input, 5V/25A Step-Down Converter (12V to 5V @ 25A)
Models for the following parts are available in LTspice:
- LTC3866
LTpowerCAD 1
Design tools for the following parts are available in LTpowerCAD:
- LTC3866
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
LTpowerCAD® is a power supply design program which selects power stage components, provides detailed power efficiency, shows quick loop Bode plot stability and load transient analysis, and can export to LTspice for simulation.
Evaluation Kits
LTC3866EUF Demo Board VIN = 4.5V to 14V, VOUT = 1.5V @ 30A
Resources
Reference Designs
