LM5017 100 V Synchronous Buck Regulator

By Texas Instruments 86

LM5017 100 V Synchronous Buck Regulator

National Semiconductor's LM5017 is a 100 V, 600 mA synchronous step-down regulator with integrated high side and low side MOSFETs. The constant-on-time (COT) control scheme employed in the LM5017 requires no loop compensation, provides excellent transient response, and enables very low step-down ratios. The on-time varies inversely with the input voltage resulting in nearly constant frequency over the input voltage range. A high voltage startup regulator provides bias power for internal operation of the IC and for integrated gate drivers. A peak current limit circuit protects against overload conditions. The undervoltage lockout (UVLO) circuit allows the input undervoltage threshold and hysteresis to be independently programmed. Other protection features include thermal shutdown and bias supply undervoltage lockout (VCC UVLO).

  • Wide 9 V to 100 V input range
  • Integrated 100 V, high and low side switches
  • No schottky required
  • Constant on-time control
  • No loop compensation required
  • Smart power meters
  • Telecommunication systems
  • Automotive electronics
  • Isolated supply

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