LTC3871ELXE#PBF
ActiveBIDIRECTIONAL POLYPHASE SYNCHRONOUS BUCK OR BOOST CONTROLLER
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LTC3871ELXE#PBF
ActiveBIDIRECTIONAL POLYPHASE SYNCHRONOUS BUCK OR BOOST CONTROLLER
Technical Specifications
Parameters and characteristics for this part
| Specification | LTC3871ELXE#PBF |
|---|---|
| Clock Sync | True |
| Control Features | Frequency Control, Phase Control, Enable, Current Limit, Soft Start |
| Duty Cycle (Max) [Max] | 98 % |
| Frequency - Switching [Max] | 460 kHz |
| Frequency - Switching [Min] | 60 kHz |
| Function | Step-Down, Step-Up |
| Mounting Type | Surface Mount |
| Number of Outputs | 2 |
| Operating Temperature [Max] | 125 °C |
| Operating Temperature [Min] | -40 °C |
| Output Configuration | Positive |
| Output Phases | Programmable |
| Output Type | Transistor Driver |
| Package / Case | 48-LQFP Exposed Pad |
| Supplier Device Package | 48-eLQFP (7x7) |
| Synchronous Rectifier | True |
| Topology | Boost, Buck |
| Voltage - Supply (Vcc/Vdd) [Max] | 100 V |
| Voltage - Supply (Vcc/Vdd) [Min] | 1.2 V |
LTC3871 Series
Bidirectional PolyPhase Synchronous Buck or Boost Controller
| Part | Operating Temperature [Min] | Operating Temperature [Max] | Number of Outputs | Voltage - Supply (Vcc/Vdd) [Min] | Voltage - Supply (Vcc/Vdd) [Max] | Output Type | Frequency - Switching [Min] | Frequency - Switching [Max] | Clock Sync | Control Features | Mounting Type | Duty Cycle (Max) [Max] | Output Configuration | Output Phases | Function | Supplier Device Package | Package / Case | Synchronous Rectifier | Topology | Frequency - Switching | Main Purpose | Regulator Topology | Voltage - Input [Min] | Voltage - Input [Max] | Outputs and Type | Outputs and Type | Board Type | Voltage - Output | Current - Output | Supplied Contents |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Analog Devices | -40 °C | 125 °C | 2 | 1.2 V | 100 V | Transistor Driver | 60 kHz | 460 kHz | Current Limit Enable Frequency Control Phase Control Soft Start | Surface Mount | 98 % | Positive | Programmable | Step-Down Step-Up | 48-eLQFP (7x7) | 48-LQFP Exposed Pad | Boost Buck | |||||||||||||
Analog Devices | -40 °C | 125 °C | 2 | 1.2 V | 100 V | Transistor Driver | 60 kHz | 460 kHz | Current Limit Enable Frequency Control Phase Control Soft Start | Surface Mount | 98 % | Positive | Programmable | Step-Down Step-Up | 48-eLQFP (7x7) | 48-LQFP Exposed Pad | Boost Buck | |||||||||||||
Analog Devices | 110 kHz | Bidirectional DC/DC | Boost Buck | 10 V 30 V | 13 V 75 V | Non-Isolated | 1 | Fully Populated | 12 V 48 V | 7.5 A 30 A | Board(s) | |||||||||||||||||||
Analog Devices | -40 °C | 125 °C | 2 | 1.2 V | 100 V | Transistor Driver | 60 kHz | 460 kHz | Current Limit Enable Frequency Control Phase Control Soft Start | Surface Mount | 98 % | Positive | Programmable | Step-Down Step-Up | 48-eLQFP (7x7) | 48-LQFP Exposed Pad | Boost Buck |
Pricing
Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly
| Distributor | Package | Quantity | $ | |
|---|---|---|---|---|
| Digikey | Tray | 1 | $ 16.10 | |
| 10 | $ 11.54 | |||
| 25 | $ 10.37 | |||
| 80 | $ 9.24 | |||
| 230 | $ 8.47 | |||
| 440 | $ 8.10 | |||
| 945 | $ 7.95 | |||
Description
General part information
LTC3871 Series
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-VLOWand boost mode from VLOW-to-VHIGHdepending 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.ApplicationsAutomotive 48V/12V Dual Battery SystemsBackup Power Systems
Documents
Technical documentation and resources