7.5-100V Wide Vin, 600mA Constant On-Time Synchronous Buck Regulator - LM5017


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


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 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).

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


  • Wide 7.5 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
  • 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

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Parametrics Compare all products in Step-Down (Buck) Converter

Regulated Outputs (#)
Vin (Min) (V)
Vin (Max) (V)
Vout (Min) (V)
Vout (Max) (V)
Iout (Max) (A)
Switching Frequency (Max) (kHz)
Switch Current Limit (Typ) (A)
Iq (Typ) (mA)
Duty Cycle (Max) (%)
Special Features
Control Mode
Vref Accuracy (Typ) (%)
Approx. Price (US$)
LM5017 LM5018 LM5019
1     1     1    
7.5     7.5     7.5    
100     100     100    
1.25     1.25     1.25    
90     90     90    
0.65     0.3     0.1    
Buck     Buck     Buck    
1000     1000     1000    
1.3     0.7     0.3    
1.75     1.75     1.75    
90     90     90    
Not Needed     Not Needed     Not Needed    
Adjustable UVLO
Synchronous Rectification    
Adjustable UVLO
Synchronous Rectification    
Adjustable UVLO
Synchronous Rectification    
Constant on-time (COT)     Constant on-time (COT)     Constant on-time (COT)    
2     2     2    
Catalog     Catalog     Catalog    
8SO PowerPAD
8SO PowerPAD
8SO PowerPAD
1.57 | 1ku     1.40 | 1ku     1.25 | 1ku    
    Min   Max   Range  
  Vin V V    9.00 – 100.00V  
  Vout1 V    1.25 – 100.00V  
  Iout1 A    ≤ 0.6A  

  Vout2 V     
  Iout2 A     

  Ambient Temp °C    ≤ 100°C  
Footprint BOM Cost Efficiency
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Companion parts

Part # Name Product Family Comments
LM25017   7.5-48V Wide Vin, 650mA Constant On-Time Synchronous Buck Regulator   CONVERTER (INTEGRATED SWITCH) - STEP-DOWN (BUCK) CONVERTER    
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