7.5-48V Wide Vin, 100mA Constant On-Time Synchronous Buck Regulator - LM25019

LM25019 (ACTIVE)

7.5-48V Wide Vin, 100mA Constant On-Time Synchronous Buck Regulator


The LM25019 is a 48 V, 100 mA synchronous step-down regulator with integrated high side and low side MOSFETs. The constant-on-time (COT) control scheme employed in the LM25019 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.

The LM25019 is available in WSON-8 and SO Power PAD-8 plastic packages.


  • Wide 7.5 V to 48 V Input Range
  • Integrated 48 V, High and Low Side
  • 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
  • Remote Shutdown
  • Thermal Shutdown
  • Packages:
    • WSON-8
    • SO Power PAD-8

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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) (%)
Soft Start
Special Features
Control Mode
Vref Accuracy (Typ) (%)
Operating Temperature Range (C)
Approx. Price (US$)
LM25019 LM25017 LM25018
1     1     1    
7.5     7.5     7.5    
48     48     48    
1.25     1.25     1.25    
40     40     40    
0.1     0.65     0.3    
Buck     Buck     Buck    
1000     1000     1000    
0.3     1.3     0.7    
1.75     1.75     1.75    
90     90     90    
None     None     None    
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    
-40 to 125     -40 to 125     -40 to 125    
8SO PowerPAD
8SO PowerPAD
8SO PowerPAD
0.81 | 1ku     1.25 | 1ku     1.12 | 1ku    

Related end equipment

  • Industrial Equipments
  • Smart Power Meters
  • Telecommunication Systems
  • Isolated Bias Supply

All trademarks are the property of their respective owners.

    Min   Max   Range  
  Vin V    9.00 – 48.00V  
  Vout V    1.25 – 48.00V  
  Iout A    ≤ 0.1A  
  Ambient Temp °C    ≤ 100°C  
Footprint BOM Cost Efficiency
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Companion parts

Part # Name Product Family Comments
LM5019   7.5-100V Wide Vin, 100mA Constant On-Time Synchronous Buck Regulator   CONVERTER (INTEGRATED SWITCH) - STEP-DOWN (BUCK) CONVERTER    
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