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

LM25018 (ACTIVE)

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

Description

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

Features

  • Wide 7.5 V to 48 V Input Range
  • Integrated 48 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
  • 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)
Topology
Switching Frequency (Max) (kHz)
Switch Current Limit (Typ) (A)
Iq (Typ) (mA)
Duty Cycle (Max) (%)
Soft Start
Compensation
Special Features
Brand
Control Mode
Vref Accuracy (Typ) (%)
Rating
Operating Temperature Range (C)
Pin/Package
Approx. Price (US$)
LM25018 LM25017 LM5017 LM5018 TPS54360 TPS54560 TPS54561 TPS54361 TPS54360-Q1 TPS54361-Q1 TPS54560-Q1 LM25019 TPS54260
1     1     1     1     1     1     1     1     1     1     1     1     1    
7.5     7.5     7.5     7.5     4.5     4.5     4.5     4.5     4.5     4.5     4.5     7.5     3.5    
48     48     100     100     60     60     60     60     60     60     60     48     60    
1.25     1.25     1.25     1.25     0.8     0.8     0.8     0.8     0.8     0.8     0.8     1.25     0.8    
40     40     90     90     58.8     58.8     59     59     58.8     59     58.8     40     58    
0.3     0.65     0.65     0.3     3.5     5     5     3.5     3.5     3.5     5     0.1     2.5    
Buck     Buck     Buck     Buck     Buck
Inverting Buck-Boost    
Buck
Inverting Buck-Boost    
Buck     Buck     Buck
Inverting Buck-Boost    
Buck     Buck
Inverting Buck-Boost    
Buck     Buck
Inverting Buck-Boost    
1000     1000     1000     1000     2500     2500     2500     2500     2500     2500     2500     1000     2500    
0.7     1.3     1.3     0.7     5.5     7.5     7.5     5.5     5.5     5.5     7.5     0.3     3.5    
1.75     1.75     1.75     1.75     0.146     0.146     0.152     0.152     0.146     0.152     0.146     1.75     0.138    
90     90     90     90     98     98     98     98     98     98     98     90     98    
None     None         Fixed     Fixed     Adjustable     Adjustable     Fixed     Adjustable     Fixed     None     Adjustable    
Not Needed     Not Needed     Not Needed     Not Needed     External     External     External     External     External     External     External     Not Needed     External    
Adjustable UVLO
Enable
Synchronous Rectification    
Adjustable UVLO
Synchronous Rectification    
Adjustable UVLO
Synchronous Rectification    
Adjustable UVLO
Synchronous Rectification    
Enable
Frequency Synchronization
Light Load Efficiency
Adjustable UVLO    
Enable
Frequency Synchronization
Light Load Efficiency
Adjustable UVLO    
Enable
Frequency Synchronization
Light Load Efficiency
Power Good
Tracking
Adjustable UVLO    
Enable
Frequency Synchronization
Light Load Efficiency
Power Good
Tracking
Adjustable UVLO    
Enable
Frequency Synchronization
Light Load Efficiency
Adjustable UVLO    
Enable
Frequency Synchronization
Light Load Efficiency
Power Good
Tracking
Adjustable UVLO    
Enable
Frequency Synchronization
Light Load Efficiency
Adjustable UVLO    
Adjustable UVLO
Enable
Synchronous Rectification    
Enable
Frequency Synchronization
Light Load Efficiency
Power Good
Tracking
Adjustable UVLO    
          SWIFT                 SWIFT    
Constant on-time (COT)     Constant on-time (COT)     Constant on-time (COT)     Constant on-time (COT)     Current Mode     Current Mode     Current Mode     Current Mode     Current Mode     Current Mode     Current Mode     Constant on-time (COT)     Current Mode    
2     2     2     2     1     1     1     1     1     1     1     2     1    
Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Automotive     Automotive     Automotive     Catalog     Catalog    
-40 to 125     -40 to 125         -40 to 125     -40 to 125     -40 to 125     -40 to 85     -40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125    
8SO PowerPAD
8WSON    
8SO PowerPAD
8WSON    
8SO PowerPAD
8WSON    
8SO PowerPAD
8WSON    
8SO PowerPAD     8SO PowerPAD     10WSON     10WSON     8SO PowerPAD     10WSON     8SO PowerPAD     8SO PowerPAD
8WSON    
10MSOP-PowerPAD
10VSON    
1.12 | 1ku     1.25 | 1ku     1.57 | 1ku     1.40 | 1ku     2.10 | 1ku     2.30 | 1ku     3.00 | 1ku     2.60 | 1ku     2.75 | 1ku     3.10 | 1ku     3.20 | 1ku     0.81 | 1ku     1.86 | 1ku    
WEBENCH® LM25018
    Min   Max   Range  
  Vin V    9.00 – 48.00V  
  Vout V    1.25 – 48.00V  
  Iout A    ≤ 0.325A  
  Ambient Temp °C    -40 – 125°C  
Footprint BOM Cost Efficiency
 
   
 
 
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Companion parts

Part # Name Product Family Comments
LM5018   7.5-100V Wide Vin, 300mA Constant On-Time Synchronous Buck Regulator   CONVERTER (INTEGRATED SWITCH) - STEP-DOWN (BUCK) CONVERTER    
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