LT1680 - High Power DC/DC Step-Up Controller

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.

Features
  • 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
Typical Application

Applications
  • High Power Single Board Systems
  • Distributed Power Converters
  • Industrial Control Systems
  • Lead-Acid Battery Back-Up Systems
  • Automotive and Heavy Equipment
Packaging
Order Information
Part NumberPackageTempPrice(1-99)Price (1k)*
LT1680CN#PBFN-16C$4.90$4.00
LT1680CSW#PBFSW-16C$5.15$4.20
LT1680CSW#TRPBFSW-16C$4.26
LT1680IN#PBFN-16I$5.90$4.80
LT1680ISW#PBFSW-16I$6.15$5.00
LT1680ISW#TRPBFSW-16I$5.06
Datasheet
Application Note
Reliability Data
Related Product
LT1680 - High Power DC/DC Step-Up Controller
AN73 - LT1339 Design Manual
R352 Reliability Data
LT1680 Footprints and Symbols