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)
Iout2 (Max) (A)
Vout2 (Min) (V)
Vout2 (Max) (V)
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$)
LM25019 LM25017 LM25018 LM5017 LM5019 LM5018 LM26420 TPS54360 TPS54560 TPS54061 TPS54561 TPS54361 TPS54360-Q1
            2     1     1     1     1     1     1    
7.5     7.5     7.5     7.5     7.5     7.5     3     4.5     4.5     4.7     4.5     4.5     4.5    
48     48     48     100     100     100     5.5     60     60     60     60     60     60    
1.25     1.25     1.25     1.25     1.25     1.25     0.8     0.8     0.8     0.8     0.8     0.8     0.8    
40     40     40     90     90     90     4.5     58.8     58.8     58     59     59     58.8    
0.1     0.65     0.3     0.65     0.1     0.3     2     3.5     5     0.2     5     3.5     3.5    
            2                
            0.8                
            4.5                
Buck     Buck     Buck     Buck     Buck     Buck     Buck     Buck
Inverting Buck-Boost    
Buck
Inverting Buck-Boost    
Buck
Inverting Buck-Boost    
Buck     Buck     Buck
Inverting Buck-Boost    
1000     1000     1000     1000     1000     1000     2200     2500     2500     1100     2500     2500     2500    
0.3     1.3     0.7     1.3     0.3     0.7     3.3     5.5     7.5     0.35     7.5     5.5     5.5    
1.75     1.75     1.75     1.75     1.75     1.75     0.9     0.146     0.146     0.09     0.152     0.152     0.146    
90     90     90     90     90     90     98     98     98     98     98     98     98    
None     None     None           Fixed     Fixed     Fixed     Fixed     Adjustable     Adjustable     Fixed    
Not Needed     Not Needed     Not Needed     Not Needed     Not Needed     Not Needed     Internal     External     External     External     External     External     External    
Adjustable UVLO
Enable
Synchronous Rectification    
Adjustable UVLO
Synchronous Rectification    
Adjustable UVLO
Enable
Synchronous Rectification    
Adjustable UVLO
Synchronous Rectification    
Adjustable UVLO
Synchronous Rectification    
Adjustable UVLO
Synchronous Rectification    
Enable
Light Load Efficiency
Phase Interleaving
Power Good
Pre-Bias Start-Up    
Enable
Frequency Synchronization
Light Load Efficiency
Adjustable UVLO    
Enable
Frequency Synchronization
Light Load Efficiency
Adjustable UVLO    
Adjustable UVLO
Enable
Frequency Synchronization
Light Load Efficiency
Synchronous Rectification    
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    
                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     Current Mode     Current Mode     Current Mode     Current Mode     Current Mode     Current Mode    
2     2     2     2     2     2     1.5     1     1     1     1     1     1    
Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Automotive    
-40 to 125     -40 to 125     -40 to 125           -40 to 125     -40 to 125     -40 to 125     -40 to 150     -40 to 125     -40 to 85     -40 to 125    
8SO PowerPAD
8WSON    
8SO PowerPAD
8WSON    
8SO PowerPAD
8WSON    
8SO PowerPAD
8WSON    
8SO PowerPAD
8WSON    
8SO PowerPAD
8WSON    
16WQFN
20HTSSOP    
8SO PowerPAD     8SO PowerPAD     8SON     10WSON     10WSON     8SO PowerPAD    
0.81 | 1ku     1.25 | 1ku     1.12 | 1ku     1.57 | 1ku     1.25 | 1ku     1.40 | 1ku     2.05 | 1ku     2.10 | 1ku     2.30 | 1ku     1.04 | 1ku     3.00 | 1ku     2.60 | 1ku     2.75 | 1ku    
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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