LM5117 Synchronous Buck Controller

By Texas Instruments 657

LM5117 Synchronous Buck Controller

Texas Instruments's LM5117 is a synchronous buck controller intended for step-down regulator applications from a high voltage or widely varying input supply. The control method is based upon current mode control utilizing an emulated current ramp. Current mode control provides inherent line feed-forward, cycle-by-cycle current limiting and ease of loop compensation. The use of an emulated control ramp reduces noise sensitivity of the pulse-width modulation circuit, allowing reliable control of very small duty cycles necessary in high input voltage applications.

  • Emulated peak current mode control
  • Wide operating range from 5.5 V to 65 V
  • Robust 3.3 A peak gate drives
  • Adaptive dead-time output driver control
  • Free-run or synchronizable clock up to 750 kHz
  • Optional diode emulation mode
  • Programmable output from 0.8 V
  • Precision 1.5% voltage reference
  • Analog current monitor
  • Programmable current limit
  • Hiccup mode over current protection
  • Programmable soft-start and tracking
  • Programmable line under-voltage lockout
  • Programmable switch-over to external bias supply
  • Thermal shutdown

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