LM25018 (ACTIVE)

7.5-48V Wide Vin, 300mA Constant On-Time Synchronous Buck Regulator

7.5-48V Wide Vin, 300mA Constant On-Time Synchronous Buck Regulator - LM25018


The LM25018 device is a 48-V, 325-mA synchronous step-down regulator with integrated high-side and low-side MOSFETs. The constant on-time (COT) control scheme employed in the LM25018 device 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.

The LM25018 device is available in WSON-8 and SO Power PAD-8 plastic packages.


  • Wide 7.5-V to 48-V Input Range
  • Integrated 325-mA, 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
  • Remote Shutdown
  • Thermal Shutdown
  • Create a Custom Design Using the LM25018 With the WEBENCH® Power Designer

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Parametrics Compare all products in Buck Converter (Integrated Switch)

Vin (Min) (V)
Vin (Max) (V)
Vout (Min) (V)
Vout (Max) (V)
Iout (Max) (A)
Regulated Outputs (#)
Switching Frequency (Min) (kHz)
Switching Frequency (Max) (kHz)
Iq (Typ) (mA)
Control Mode
Duty Cycle (Max) (%)
Operating Temperature Range (C)
Package Group
LM25018 LM25019
7.5    7.5   
48    48   
1.25    1.25   
40    40   
0.3    0.1   
1    1   
50    50   
1000    1000   
1.75    1.75   
Synchronous Rectification
UVLO Adjustable   
Synchronous Rectification
UVLO Adjustable   
Constant on-time (COT)    Constant on-time (COT)   
90    90   
-40 to 125    -40 to 125   
Catalog    Catalog   

WEBENCH® Designer LM25018

  Min   Max Range
Vin  V 9.00 to 48.00V
Vout  V 1.25 to 48.00V
Iout  A ≤ 0.325A
Ambient Temp  °C ≤ 100°C
Isolated Output

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