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Analog Devices LTC3871 | Demoboard DC2348A-A
Bidirectional PolyPhase Synchronous Buck or Boost Controller
Overview
| Topology | Boost Converter |
| Input voltage | 10-13 V |
| Output 1 | 49 V / 15 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) | Wire Type | Pins | Type | Mount | L(mm) | H(mm) | IR(A) | Working Voltage(V (AC)) | Operating Temperature | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-HCF SMT High Current Inductor, 10 µH, 34.95 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCF SMT High Current Inductor | Inductance10 µH | Performance Rated Current34.95 A | Saturation Current @ 10%32.6 A | Saturation Current @ 30%37 A | DC Resistance2.64 mΩ | Self Resonant Frequency13 MHz | Wire TypeFlat | Pins2 | – | MountSMT | Length27 mm | Height18.5 mm | Rated Current35 A | – | Operating Temperature -40 °C up to +125 °C | ||||
 | WR-PHD Jumper, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-PHD Jumper | – | – | – | – | – | – | – | Pins2 | – | – | – | – | Rated Current3 A | Working Voltage200 V (AC) | Operating Temperature -25 °C up to +105 °C | |||
 | WR-PHD Pin Header, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-PHD Pin Header | – | – | – | – | – | – | – | Pins3 | TypeStraight | MountTHT | Length6 mm | – | Rated Current2 A | Working Voltage200 V (AC) | Operating Temperature -40 °C up to +105 °C | |||
 | WR-PHD Pin Header, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-PHD Pin Header | – | – | – | – | – | – | – | Pins4 | TypeStraight | MountTHT | Length8 mm | – | Rated Current2 A | Working Voltage200 V (AC) | Operating Temperature -40 °C up to +105 °C | |||
 | WR-PHD Pin Header, –, – | Simulation– | Downloads7 files | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-PHD Pin Header | – | – | – | – | – | – | – | Pins8 | TypeStraight | MountTHT | Length8 mm | – | Rated Current2 A | Working Voltage200 V (AC) | Operating Temperature -40 °C up to +105 °C |