Overview

Features and Benefits

  • Optimized for High Input Voltage Applications
  • Wide Chip Supply Voltage Range: 6V to 36V
  • Internal 7V Low Dropout Voltage Regulator Optimized for 6V-Rated MOSFETs
  • Current Mode Control Provides Excellent Transient Response
  • High Maximum Duty Cycle (92% Typ)
  • ±2% RUN Pin Threshold with 100mV Hysteresis
  • ±1% Internal Voltage Reference
  • Micropower Shutdown: IQ = 10µA
  • Programmable Operating Frequency (50kHz to 1MHz) with One External Resistor
  • Synchronizable to an External Clock Up to 1.3 × fOSC
  • User-Controlled Pulse Skip or Burst Mode® Operation
  • Output Overvoltage Protection
  • Can be Used in a No RSENSE Mode for VDS < 36V
  • Small 10-Lead MSOP Package

Product Details

The LTC1871-7 is a current mode, boost, flyback and SEPIC controller optimized for driving 6V-rated MOSFETs in high voltage applications. The LTC1871-7 works equally well in low or high power applications and requires few components to provide a complete power supply solution. The switching frequency can be set with an external resistor over a 50kHz to 1MHz range, and can be synchronized to an external clock using the MODE/SYNC pin. Burst Mode operation at light loads, a low minimum operating supply voltage of 6V and a low shutdown quiescent current of 10µA make the LTC1871-7 well suited for battery-operated systems. For applications requiring constant frequency operation, Burst Mode operation can be defeated using the MODE/SYNC pin. The LTC1871-7 is available in the 10-lead MSOP package.

VIN Range INTVCC Features
LTC1871 2.5V to 36V 5.2V -
LTC1871-1 2.5V to 36V 5.2V Lower Burst Mode Threshold (0.195V vs. 0.3V)
LTC1871-7 6V to 36V 7V Drives 6V Gate N-Channel MOSFETs
LTC1871X 2.5V to 36V 5.2V 175°C Junction Temp, 100% Tested at 175°C

Applications

  • Telecom Power Supplies
  • 42V Automotive Systems
  • 24V Industrial Controls
  • IP Phone Power Supplies

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Tools & Simulations

LTspice

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.

LTspice

Models for the following parts are available in LTspice:

LTC1871
LTC1871-1
LTC1871-7

Product Recommendations

LTC1871-7 Companion Parts

Recommended Suggested Oscillator

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

Discussions

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The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


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