LTC3871
RECOMMENDED FOR NEW DESIGNSBidirectional PolyPhase Synchronous Buck or Boost Controller
- Part Models
- 13
- 1ku List Price
- Starting From $8.05
Overview
- Unique Architecture Allows Dynamic Regulation of Input Voltage, Output Voltage or Current
- VHIGH Voltages Up to 100V
- VLOW Voltages Up to 30V
- Synchronous Rectification: Up to 97% Efficiency
- ADI-Proprietary Advanced Current Mode Control
- ±1% Voltage Regulation Accuracy Over Temperature
- Accurate, Programmable Output Current Monitoring and Regulation for Both Buck and Boost Operation
- Selectable Buck and Boost Current Sense Limits
- Programmable DRVCC/EXTVCC Optimizes Efficiency
- Programmable VHIGH UV and OV Thresholds
- Programmable VLOW OV Threshold
- Phase-Lockable Frequency: 60kHz to 460kHz
- Multiphase/Multi-ICs Operation Up to 12 Phases
- Selectable CCM/DCM Modes
- Thermally Enhanced 48-Lead LQFP Package
- AEC-Q100 Qualified for Automotive Applications
The LTC3871/LTC3871-1 is a high performance bidirectional buck or boost switching regulator controller that operates in either buck or boost mode on demand. It regulates in buck mode from VHIGH-to-VLOW and boost mode from VLOW-to-VHIGH depending on a control signal, making it ideal for 48V/12V automotive dual battery systems. An accurate current programming loop regulates the maximum current that can be delivered in either direction. The LTC3871/LTC3871-1 allows both batteries to supply energy to the load simultaneously by converting energy from one battery to the other.
Its proprietary constant-frequency current mode architecture enhances the signal-to-noise ratio enabling low noise operation and provides excellent current matching between phases. Additional features include discontinuous or continuous mode of operation, OV/UV monitors, independent loop compensation for buck and boost operation, accurate output current monitoring and overcurrent protection. The LTC3871 and LTC3871-1 have different current limit foldback characteristics.
Applications
- Automotive 48V/12V Dual Battery Systems
- Backup Power Systems
Documentation
Data Sheet 1
User Guide 2
Technical Articles 2
Video 2
Product Selector Card 2
Analog Dialogue 1
Thought Leadership 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 |
|---|---|---|---|
| LTC3871ELXE#PBF | 48-Lead LQFP (7mm x 7mm w/ EP) | ||
| LTC3871ELXE-1#PBF | 48-Lead LQFP (7mm x 7mm w/ EP) | ||
| LTC3871HLXE#3ZZPBF | 48-Lead LQFP (7mm x 7mm w/ EP) | ||
| LTC3871HLXE#PBF | 48-Lead LQFP (7mm x 7mm w/ EP) | ||
| LTC3871HLXE#WPBF | 48-Lead LQFP (7mm x 7mm w/ EP) | ||
| LTC3871HLXE-1#PBF | 48-Lead LQFP (7mm x 7mm w/ EP) | ||
| LTC3871HLXE-1#WPBF | 48-Lead LQFP (7mm x 7mm w/ EP) | ||
| LTC3871ILXE#PBF | 48-Lead LQFP (7mm x 7mm w/ EP) | ||
| LTC3871ILXE#WPBF | 48-Lead LQFP (7mm x 7mm w/ EP) | ||
| LTC3871ILXE-1#3OZPBF | 48-Lead LQFP (7mm x 7mm w/ EP) | ||
| LTC3871ILXE-1#3ZZPBF | 48-Lead LQFP (7mm x 7mm w/ EP) | ||
| LTC3871ILXE-1#PBF | 48-Lead LQFP (7mm x 7mm w/ EP) | ||
| LTC3871ILXE-1#WPBF | 48-Lead LQFP (7mm x 7mm w/ EP) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Jun 24, 2021 - 21_0046 Transfer of LQFP and LQFP_EP from AEM to AET |
||
| LTC3871ELXE#PBF | PRODUCTION | |
| LTC3871ELXE-1#PBF | PRODUCTION | |
| LTC3871ILXE#PBF | PRODUCTION | |
| LTC3871ILXE-1#PBF | PRODUCTION | |
|
Dec 17, 2021 - 21_0046 Transfer of LQFP and LQFP_EP from AEM to AET |
||
| LTC3871HLXE#PBF | PRODUCTION | |
| LTC3871HLXE-1#PBF | 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
Tools & Simulations
LTspice 2
- LTC3871 Demo Circuit - High Power PolyPhase Bi-Directional (Buck Mode) Converter (30-75V to 12V @ 30A)
- LTC3871 Demo Circuit - High Power PolyPhase Bi-Directional (Boost Mode) Converter (10-13V to 48V @ 7.5A)
Models for the following parts are available in LTspice:
- LTC3871
LTpowerCAD 4
- LTC3871 Project - Bidirectional PolyPhase Synchronous Buck Controller (30-75V to 12V @ 30A)
- LTC3871 Project - Bidirectional PolyPhase Synchronous Buck Controller (30-75V to 12V @ 60A)
- LTC3871 Demo Board DC2348A-A Buck with AECQ parts
- LTC3871 Demo Board DC2348A-B Buck Mode
Design tools for the following parts are available in LTpowerCAD:
- LTC3871
- LTC3871(BOOST)
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
20A LTC3871 Power boards for LT8740 Device Power Supply
Resources
LTC3871HLXE#PBF Demo Board | Bidirectional Controller, Buck Mode: 30V ≤ VIN ≤ 75V, VOUT = 12V @ 30A; Boost Mode: 10V ≤ VIN ≤ 13V, VOUT = 48V @ 7.5A
Resources
LTC3871HLXE#PBF Demo Board | Bidirectional Controller, Buck Mode: 30V ≤ VIN ≤ 75V, VOUT = 12V @ 60A; Boost Mode: 10V ≤ VIN ≤ 13V, VOUT = 48V @ 15A