(ACTIVE) 7.5-100V Wide Vin, 600mA Constant On-Time Synchronous Buck Regulator


Functional diagram

Typical Application


The 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 high 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).

The LM5017 device is available in WSON-8 and HSOP PowerPAD-8 plastic packages.


  • Wide 7.5-V to 100-V Input Range
  • Integrated 100-V High-Side,
    and Low-Side Switches
  • No Schottky Required
  • Constant On-Time Control
  • No Loop Compensation Required
  • Ultra-Fast Transient Response
  • Nearly Constant Operating Frequency
  • Intelligent Peak Current Limit
  • Adjustable Output Voltage From 1.225 V
  • Precision 2% Feedback Reference
  • Frequency Adjustable to 1 MHz
  • Adjustable Undervoltage Lockout (UVLO)
  • Remote Shutdown
  • Thermal Shutdown
  • Packages:
    • WSON-8
    • SO PowerPAD™-8
  • Create a Custom Design Using the LM5017 with the WEBENCH Power Designer

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Vin (Min) (V) 7.5   
Vin (Max) (V) 100   
Vout (Min) (V) 1.25   
Vout (Max) (V) 90   
Iout (Max) (A) 0.65   
Regulated Outputs (#) 1   
Switching Frequency (Min) (kHz) 50   
Switching Frequency (Max) (kHz) 1000   
Iq (Typ) (mA) 1.75   
Special Features Synchronous Rectification^UVLO Adjustable   
Control Mode Constant on-time (COT)   
Duty Cycle (Max) (%) 90   
Operating Temperature Range (C) -40 to 125   
Rating Catalog   
Package Group SO PowerPAD^WSON   

Companion Products

Technical Documents

Datasheet (1)

Application notes (6)

User guides (2)

Selection guides (10)

Solution guides (7)

White papers (3)

More literature (3)

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