Overview

Features and Benefits

  • Dual Synchronous Buck Plus Single Boost Controllers
  • Low Operating IQ:
    • 14μA (14V to 3.3V, Channel 1 On)
  • Outputs Remain in Regulation Through Cold Crank Down to 1V Input Supply Voltage
  • Wide Bias Input Voltage Range: 4.5V to 40V
  • Buck Output Voltages Up to 40V
  • Boost Output Voltage Limited Only by External Components
  • Spread Spectrum Operation
  • RSENSE or DCR Current Sensing
  • Low Battery Indicator for Automotive Applications
  • Programmable Fixed Frequency (100kHz to 3MHz)
  • Phase-Lockable Frequency (100kHz to 3MHz)
  • Selectable Continuous, Pulse-Skipping, or Low Ripple Burst Mode® Operation at Light Loads
  • Boost Channel Current Monitor Output
  • Low Shutdown IQ: 1.5μA
  • Small 40-Lead 6mm × 6mm QFN Package
  • AEC-Q100 Qualified for Automotive Applications

Product Details

The LTC7811 is a high performance triple output (buck/buck/boost) DC/DC switching regulator controller that drives all N-channel power MOSFET stages. Its constant frequency current mode architecture allows a phase-lockable switching frequency of up to 3MHz. The LTC7811 operates from a wide 4.5V to 40V input supply range. When biased from the output of the boost converter or another auxiliary supply, the LTC7811 can operate from an input supply as low as 1V after start-up.

The very low no-load quiescent current extends operating run time in battery powered systems. OPTI-LOOP® compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. The LTC7811 features a precision 0.8V reference for the bucks, 1.2V reference for the boost and a power good output indicator.

The LTC7811 additionally features spread spectrum operation which significantly reduces the peak radiated and conducted noise on both the input and output supplies, making it easier to comply with electromagnetic interference (EMI) standards.

APPLICATIONS

  • Automotive and Transportation
  • Industrial
  • Military/Avionics

Product Lifecycle icon-recommended Recommended for New Designs

This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

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Evaluation Boards

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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.