Analog Devices Inc. LTC7871 Bidirectional Buck or Boost Controllers

Analog Devices Inc. LTC7871 Bidirectional Buck or Boost Controllers are a high-performance switching regulator controllers that operate either in buck or boost mode on demand. The buck mode operates from V_HIGH to V_LOW and boost mode operates from V_LOW to V_HIGH depending on the control signal. This makes it ideal for 48V/12V automotive dual battery systems that allow both the batteries to supply energy to the load simultaneously.

The LTC7871 controllers exhibit unique architecture that allows dynamic regulation of input voltage, output voltage, or current. These buck or boost controllers feature SPI compliant serial interface, discontinuous or continuous mode of operation, OV/UV monitors, accurate inductor current monitoring, and overcurrent protection. The LTC7871 controllers are available in a 64 pin 10mm × 10mm LQFP package and are AEC-Q100 qualified.

Features

Unique architecture allows dynamic regulation of input voltage, output voltage, or current
Operates with external gate drivers and MOSFETs
V_HIGH voltages Up to 100V and V_LOW voltages Up to 60V
Synchronous rectification: Up to 98% efficiency
Accurate, programmable inductor current monitoring, and bidirectional regulation
SPI compliant serial interface
- Operation status and fault report
- Programmable V_HIGHand V_LOW margining

60kHz to 750kHz phase-lockable frequency
ADI-proprietary advanced current mode control
±1% voltage regulation accuracy overtemperature
Optional spread spectrum modulation
Multiphase/multi-ICs operation up to 24 phases
Selectable CCM/DCM/burst mode operation
Thermally enhanced 64-lead LQFP package
AEC-Q100 qualification in progress

Applications

Automotive 48V/12V dual battery systems

Backup power systems

Analog Devices Inc. LTC7871 Bidirectional Buck or Boost Controllers

Features

Applications

Application Circuit

Boost-to-Buck Transition Graph

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