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

Description

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 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 start-up 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 8-pin WSON and 8-pin SO PowerPAD plastic packages.

Features

  • Wide 7.5-V to 48-V Input Range
  • Integrated 100-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
  • Packages:
    • 8-Pin WSON
    • 8-Pin SO PowerPAD™

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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
Preset Vout (V)
Vref Accuracy (Typ) (%)
Rating
Operating Temperature Range (C)
Pin/Package
Approx. Price (US$)
LM25019 LM25017 LM25018 LM5017 LM5019 LM5018 TPS54331 TPS62730 TPS54328 TPS54327 TPS54239 TPS54228 TPS54227
              1         1        
              1.9         4.5        
              3.9         23        
              2.1         0.76        
              2.1         7        
0.1     0.65     0.3     0.65     0.1     0.3     3     0.1     3     3     2     2     2    
              Buck         Buck        
                    600        
              0.41         3.1        
1.75     1.75     1.75     1.75     1.75     1.75     0.11     0.025     0.8     0.8     0.6     0.8     0.8    
90     90     90     90     90     90     90     100     90     90     90     90     90    
              Fixed         Adjustable        
Not Needed     Not Needed     Not Needed     Not Needed     Not Needed     Not Needed     External     Internal     Not Needed     Not Needed     Not Needed     Not Needed     Not Needed    
              Enable
Light Load Efficiency
Synchronous Rectification    
    Enable
Synchronous Rectification    
   
              DCS-Control     SWIFT     SWIFT       SWIFT      
Constant on-time (COT)     Constant on-time (COT)     Constant on-time (COT)     Constant on-time (COT)     Constant on-time (COT)     Constant on-time (COT)     Current Mode       D-CAP2     D-CAP2     D-CAP2     D-CAP2     D-CAP2    
              2.1              
              1.5         2        
Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog    
-40 to 125     -40 to 125     -40 to 125           -40 to 150     -40 to 85     -40 to 85     -40 to 85     -40 to 85     -40 to 85     -40 to 85    
8SO PowerPAD
8WSON    
8SO PowerPAD
8WSON    
8SO PowerPAD
8WSON    
8SO PowerPAD
8WSON    
8SO PowerPAD
8WSON    
8SO PowerPAD
8WSON    
8SO PowerPAD
8SOIC    
6SON     10VSON
8SO PowerPAD    
10VSON
8SO PowerPAD    
8SO PowerPAD     10VSON
8SO PowerPAD
8SOIC    
10VSON
8SO PowerPAD    
0.81 | 1ku     1.25 | 1ku     1.12 | 1ku     1.57 | 1ku     1.25 | 1ku     1.40 | 1ku     0.60 | 1ku     0.65 | 1ku     0.75 | 1ku     0.73 | 1ku     0.73 | 1ku     0.63 | 1ku     0.61 | 1ku    

Related end equipment

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

All trademarks are the property of their respective owners.

WEBENCH® LM25019
    Min   Max   Range  
  Vin V    9.00 – 48.00V  
  Vout V    1.25 – 48.00V  
  Iout A    ≤ 0.1A  
  Ambient Temp °C    -40 – 125°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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