Synchronous 4-Switch Buck-Boost DC-DC Controller with Pass-Through

The LT8210 from Analog Devices is a 4-switch synchronous buck-boost dc-dc controller that can operate in pass-through, forced continuous, pulse-skipping and Burst Mode® operation. Pass-through is a feature that passes the input directly to the output when the input is within a user programmable window.

Pass-through mode eliminates switching losses and EMI along with maximizing efficiency. For input voltages above or below the pass-through window, the buck or boost regulation loops maintain the output at the set maximum or minimum values, respectively.

Applications are expected to include:

  • Automotive, Industrial, Telecom, Avionics Systems
  • Automotive Start-Stop, Emergency Call Applications
  • ISO 7637, ISO 16750, MIL-1275, DO-160 Applications

The GATEVCC driver supply is regulated to 10.6V allowing the use of standard-level MOSFETs and can be powered through the EXTVCC pin for improved efficiency. The GATEVCC regulator is back-drive-protected to ride through input brownouts while maintaining regulation.

Optional reverse input protection down to -40V can be implemented with the addition of a single N-channel MOSFET. The LT8210 includes a precision current sense amplifier that can accurately monitor and limit output or input average current.

Typical application schematic (click on image to enlarge)

Features & Specifications

  • Pin-Selectable Pass-Through or Fixed Output CCM, DCM, Burst Mode® Operation
  • Programmable Non-Switching Pass-Through Window
  • 18µA Pass-Through Mode IQ with 99.9% Efficiency
  • VIN Range: 2.8V to 100V (4.5V for Start-Up)
  • VOUT Range: 1V to 100V
  • Reverse Input Protection to -40V
  • ±1.25% Output Voltage Accuracy (-40°C to 125°C)
  • ±3% Accurate Current Monitoring
  • ±5% Accurate Current Regulation
  • 10V Quad N-Channel MOSFET Gate Drivers
  • EXTVCC LDO Powers Drivers from VOUT/External Rail
  • ±20% Cycle-by-Cycle Inductor Current Limit
  • No Top MOSFET Refresh Noise in Buck or Boost
  • Fixed/Phase-Lockable Frequency: 80kHz to 400kHz
  • Spread Spectrum Frequency Modulation for Low EMI
  • Power Good Output Voltage/Overcurrent Monitor
  • Available in a 38-Lead TSSOP Package
Analog Devices Inc.
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