7.5-100V Wide Vin, 100mA Constant On-Time Synchronous Buck Regulator - LM5019

LM5019 (ACTIVE)

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

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Description

The LM5019 is a 100-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 LM5019 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 LM5019 device is available in WSON-8 and SO PowerPAD-8 plastic packages.

Features

  • Wide 7.5-V to 100-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$)
LM5019 LM25017 LM25018 LM25019 LM5017 LM5018 TPS54331 TPS62740 TPS62730 LM5008A LM5009A LM25010 TPS54328
              1     1         1      
              2.2     1.9         6      
              5.5     3.9         42      
              1.8     2.1         2.5      
              3.3     2.1         37      
0.1     0.65     0.3     0.1     0.65     0.3     3     0.3     0.1     0.35     0.15     1     3    
              Buck     Buck         Buck      
                      1000      
              0.6     0.41         1.25      
1.75     1.75     1.75     1.75     1.75     1.75     0.11     0.0003     0.025     0.485     0.485     0.645     0.8    
90     90     90     90     90     90     90     100     100     99     99     99     90    
              Fixed     Fixed         Adjustable      
Not Needed     Not Needed     Not Needed     Not Needed     Not Needed     Not Needed     External     Internal     Internal     Not Needed     Not Needed     Not Needed     Not Needed    
              Dynamic Voltage Scaling
Enable
Light Load Efficiency
Output Discharge
Synchronous Rectification    
Enable
Light Load Efficiency
Synchronous Rectification    
    Enable      
              DCS-Control     DCS-Control           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         Constant on-time (COT)     Constant on-time (COT)     Constant on-time (COT)     D-CAP2    
                2.1            
              2.5     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 125     -40 to 125     -40 to 125     -40 to 85    
8SO PowerPAD
8WSON    
8SO PowerPAD
8WSON    
8SO PowerPAD
8WSON    
8SO PowerPAD
8WSON    
8SO PowerPAD
8WSON    
8SO PowerPAD
8WSON    
8SO PowerPAD
8SOIC    
12WSON     6SON     8VSSOP
8WSON    
8VSSOP
8WSON    
10WSON
14HTSSOP    
10VSON
8SO PowerPAD    
1.25 | 1ku     1.25 | 1ku     1.12 | 1ku     0.81 | 1ku     1.57 | 1ku     1.40 | 1ku     0.60 | 1ku     1.15 | 1ku     0.65 | 1ku     1.20 | 1ku     1.10 | 1ku     0.95 | 1ku     0.75 | 1ku    
WEBENCH® LM5019
    Min   Max   Range  
  Vin V V    9.00 – 100.00V  
  Vout1 V    1.25 – 100.00V  
  Iout1 A    ≤ 0.1A  

  Vout2 V     
  Iout2 A     

  Ambient Temp °C    ≤ 100°C  
Footprint BOM Cost Efficiency
 
 
 
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Companion parts

Part # Name Product Family Comments
LM25019   7.5-48V Wide Vin, 100mA Constant On-Time Synchronous Buck Regulator   CONVERTER (INTEGRATED SWITCH) - STEP-DOWN (BUCK) CONVERTER    
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