LT1680

PRODUCTION

High Power DC/DC Step-Up Controller

Data Sheet Product Selection Table
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Overview

  • High Voltage: Operation Up to 60V
  • High Current: N-Channel Drive Handles Up to 10,000pF Gate Capacitance
  • Programmable Average Current Limiting
  • 5V Reference Output with 10mA External Loading Capability
  • Fixed Frequency Current Mode Operation
  • Oscillator Synchronizable Up to 200kHz
  • Undervoltage Lockout with Hysteresis
  • Programmable Start Inhibit for Power Supply Sequencing and Protection
  • User Adjustable Slope Compensation

The LT1680 is a high power, current mode switching power supply controller optimized for boost topologies. The IC drives an N-channel MOSFET switch for DC/DC converter applications up to 60V input. A high current gate drive output handles up to 10,000pF gate capacitance, enabling the construction of high power DC/DC converters. Current sense common mode range up to 60V allows current sensing to be referenced to the input supply, eliminating the need for sense blanking circuits.

The LT1680 incorporates programmable average current limiting allowing accurate limiting of DC current in the magnetics, independent of ripple current. User adjustable slope compensation provides stable operation at duty cycles up to 90%.

The LT1680 operating frequency is programmable and can be synchronized up to 200kHz. Minimum off-time operation provides switch protection. The IC also incorporates a soft start feature that is gated by both shutdown and undervoltage lockout conditions.

Applications

  • High Power Single Board Systems
  • Distributed Power Converters
  • Industrial Control Systems
  • Lead-Acid Battery Back-Up Systems
  • Automotive and Heavy Equipment
LT1680
High Power DC/DC Step-Up Controller
12V to 48V, 250W Boost Converter Efficiency vs Output Power Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

Application Note 2

Data Sheet

This is the most up-to-date revision of the Data Sheet.

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Oscillators 2
LTC6908
Resistor Set SOT-23 Oscillator with Spread Spectrum Modulation
LTC6909
PRODUCTION 1 to 8 Output, Multiphase Silicon Oscillator with Spread Spectrum Modulation
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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

  • LT1680
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.

Latest Discussions

2 Years Ago
Need Help In Frequency Domain Simulation in LT Spice
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Short circuit protection on boost dc/dc converter LT1680 based
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