LTC3880/LTC3887 DC/DC Synchronous Regulator Controllers

By 3M


Image of Linear Technology LTC3880/LTC3887 DC/DC Synchronous Regulator ControllersPower by Linear™ / Analog Devices LTC3880 and LTC3887 are dual, PolyPhase® DC/DC synchronous step-down switching regulator controllers with an I²C-based PMBus compliant serial interface. These controllers use a constant frequency, current mode architecture that is supported by LTpowerPlay™ software development tool with graphical user interface (GUI). Switching frequency, output voltage, and device address can be programmed using external configuration resistors. Additionally, parameters can be set via the digital interface or stored in EEPROM. Voltage, current, internal/external temperature, and fault status can be read back through the bus interface.

The LTC3880 incorporates a 5 V linear regulator while the LTC3880-1 uses an external 5 V supply for minimum power loss. The LTC3887 has integrated gate drivers. The LTC3887-1 has three-state PWM pins to drive DrMOS power stages. The LTC3887-2 has gate drivers and no LDO and supports VIN up to 34 V. The LTC3887 is an enhanced version of the LTC3880 with greater output voltage range and more digital features.

These controllers come in a 40-pin QFN package that has a temperature range of -40°C to +125°C. The LTC3880 and LTC3887 are perfect for telecom, power distribution, and smart energy applications.

Features

  • PMBus/I²C compliant serial interface
  • Telemetry read back includes VIN, IIN, VOUT, IOUT, temperature, duty cycle, and faults
  • Programmable voltage, current limit, digital soft-start/stop, sequencing, margining, OV/UV, and frequency synchronization (250 kHz to 1 MHz)
  • ±0.5% output voltage accuracy over temperature
  • Integrated 16-bit ADC
  • Internal EEPROM and fault logging with ECC
  • Integrated N-channel MOSFET gate drivers
  • Minimum on-time: 45 ns
  • Wide VIN range: 4.5 V to 24 V
  • VOUT range: 0.5 V to 5.5 V (VOUT0, VOUT1)
  • Analog current mode control loop
  • Remote differential sense for PolyPhase applications
  • PolyPhase current sharing for up to six phases
  • 40-pin (6 mm × 6 mm) QFN package

Applications

  • Telecom, datacom, and storage systems
  • High current distributed power systems
  • Intelligent energy efficient power regulation
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