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Analog Devices LTC3871 | Demoboard DC2348A-A
Bidirectional PolyPhase Synchronous Buck or Boost Controller
Overview
| Topology | Buck Converter |
| Input voltage | 30-75 V |
| Output 1 | 12.2 V / 60 A |
| IC revision | B |
Description
The LTCR3871/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.
Features
- Unique Architecture Allows Dynamic Regulation ofInput 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 Monitoringand 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
Typical applications
- Automotive 48V/12V Dual Battery Systems
- Backup Power Systems
More information
Products
| Order Code | Datasheet | Simulation | Downloads | Status | Product series | L (µH) | IRP,40K (A) | ISAT,10% (A) | ISAT,30% (A) | RDC max. (mΩ) | fres (MHz) | Pins (Value) (pcs) | Rows | H (mm) | Gender | Type | IR (A) | Packaging | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | 7443641000 | SPEC | 8 files | Active i| Production is active. Expected lifetime: >10 years. | WE-HCF SMT High Current Inductor | 10 | 34.95 | 32.6 | 37 | 2.64 | 13 | 2 | – | 18.5 | – | – | 35 | – | ||
 | 60800213421 | SPEC | – | 3 files | Active i| Production is active. Expected lifetime: >10 years. | WR-PHD 2.00 mm Jumper with Test Point | – | – | – | – | – | – | 2 | – | – | Jumper | – | 3 | Bag | |
 | 62000311121 | SPEC | – | 6 files | Active i| Production is active. Expected lifetime: >10 years. | WR-PHD 2.00 mm THT Pin Header | – | – | – | – | – | – | 3 | Single | – | Pin Header | Straight | 2 | Bag | |
 | 62000411121 | SPEC | – | 6 files | Active i| Production is active. Expected lifetime: >10 years. | WR-PHD 2.00 mm THT Pin Header | – | – | – | – | – | – | 4 | Single | – | Pin Header | Straight | 2 | Bag | |
 | 62000821121 | SPEC | – | 6 files | Active i| Production is active. Expected lifetime: >10 years. | WR-PHD 2.00 mm THT Dual Pin Header | – | – | – | – | – | – | 8 | Dual | – | Pin Header | Straight | 2 | Bag |
| Order Code | Datasheet | Simulation | |
|---|---|---|---|
| 7443641000 | SPEC | |
| 60800213421 | SPEC | – |
| 62000311121 | SPEC | – |
| 62000411121 | SPEC | – |
| 62000821121 | SPEC | – |
| Samples |
|---|
| Order Code | Datasheet | Simulation | Downloads | Status | Product series | L (µH) | IRP,40K (A) | ISAT,10% (A) | ISAT,30% (A) | RDC max. (mΩ) | fres (MHz) | Pins (Value) (pcs) | Rows | H (mm) | Gender | Type | IR (A) | Packaging | Samples |
|---|