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  6. LTC3701

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Overview

Features and Benefits

  • Out-of-Phase Controllers Reduce Required Input Capacitance
  • True PLL for Frequency Locking or Frequency Adjustment
  • Operating Frequency Range: 300kHz to 750kHz
  • Wide VIN Range: 2.5V to 10V
  • Constant Frequency Current Mode Architecture
  • Low Dropout: 100% Duty Cycle
  • Power Good Output Voltage Monitor
  • Internal Soft-Start Circuitry
  • Selectable Burst Mode®/Pulse Skipping Operation at Light Loads
  • Output Overvoltage Protection
  • Low Quiescent Current: 460µA
  • 0.8V ±2% Voltage Reference
  • Small 16-Lead Narrow SSOP Package

Product Details

The LTC3701 is a 2-phase dual constant frequency current mode step-down DC/DC controller providing excellent load and line regulation. Power loss and noise due to ESR of the input capacitor are minimized by operating the two controller output stages out-of-phase.

The LTC3701 provides a 0.8V ±2% voltage reference and consumes only 460µA of quiescent current. To further maximize the life of a battery source, the external P-channel MOSFET is turned on continuously in dropout (100% duty cycle).

Switching frequency is internally set at 550kHz, allowing the use of small inductors and capacitors. For noise sensitive applications, the LTC3701 can be externally synchronized using its phase-locked loop. The frequency can also be externally set from 300kHz to 750kHz by applying a voltage to the PLLLPF pin. Burst Mode operation is inhibited during synchronization or when the EXTCLK/MODE pin is pulled low to reduce noise and RF interference.

The LTC3701 contains independent internal soft-start circuitry for each controller. Other features include a power good output voltage monitor and output overvoltage and short-circuit protection.

The LTC3701 is available in a small footprint 16-lead narrow SSOP package.

Applications

  • One or Two Lithium-Ion Powered Applications
  • Notebook and Handheld Computers
  • Personal Digital Assistants
  • Portable Instruments
  • Distributed DC Power Systems

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Evaluation Kits (1)

Documentation & Resources

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  • Data Sheets (1)
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    Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
    LTC3701EGN#PBF Material Declaration Reliability Data 16-Lead SSOP (Narrow 0.15 Inch)
    LTC3701EGN#TRPBF Material Declaration Reliability Data 16-Lead SSOP (Narrow 0.15 Inch)
    Wafer Fabrication Data R421 Reliability Data

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    • LTC3701EGN#PBF Production
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