7.5-100V Wide Vin, 300mA Constant On-Time Synchronous Buck Regulator - LM5018

LM5018 (ACTIVE)

7.5-100V Wide Vin, 300mA Constant On-Time Synchronous Buck Regulator

Description

The LM5018 is a 100 V, 300 mA synchronous step-down regulator with integrated high side and low side MOSFETs. The constant-on-time (COT) control scheme employed in the LM5018 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 LM5018 is available in WSON-8 and SO PowerPAD-8 plastic packages.

Features

  • Wide 7.5 V to 100 V Input Range
  • Integrated 100 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 PowerPAD-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$)
LM5018 LM5017 LM5019 LM25017 LM25018 TPS54331 TPS54328 TPS54327 TPS54239 TPS54228 TPS54229 TPS54227 TPS54239E
1     1     1     1     1     1     1     1     1     1     1     1     1    
7.5     7.5     7.5     7.5     7.5     3.5     4.5     4.5     4.5     4.5     4.5     4.5     4.5    
100     100     100     48     48     28     18     18     23     18     18     18     23    
1.25     1.25     1.25     1.25     1.25     0.8     0.76     0.76     0.76     0.76     0.76     0.76     0.76    
90     90     90     40     40     25     7     7     7     7     7     7     7    
0.3     0.65     0.1     0.65     0.3     3     3     3     2     2     2     2     2    
Buck     Buck     Buck     Buck     Buck     Buck     Buck     Buck     Buck     Buck     Buck     Buck     Buck    
1000     1000     1000     1000     1000     570     700     700     600     700     650     700     600    
0.7     1.3     0.3     1.3     0.7     5.8     4.2     4.2     3.1     3.3     3.3     3.3     3.1    
1.75     1.75     1.75     1.75     1.75     0.11     0.8     0.8     0.6     0.8     0.8     0.8     0.6    
90     90     90     90     90     90     90     90     90     90     90     90     90    
      None     None     Adjustable     Adjustable     Adjustable     Adjustable     Adjustable     Adjustable     Adjustable     Adjustable    
Not Needed     Not Needed     Not Needed     Not Needed     Not Needed     External     Not Needed     Not Needed     Not Needed     Not Needed     Not Needed     Not Needed     Not Needed    
Adjustable UVLO
Synchronous Rectification    
Adjustable UVLO
Synchronous Rectification    
Adjustable UVLO
Synchronous Rectification    
Adjustable UVLO
Synchronous Rectification    
Adjustable UVLO
Enable
Synchronous Rectification    
Enable
Light Load Efficiency
Adjustable UVLO    
Enable
Light Load Efficiency
Synchronous Rectification    
Enable
Synchronous Rectification    
Enable
Synchronous Rectification    
Enable
Light Load Efficiency
Synchronous Rectification    
Enable
Synchronous Rectification    
Enable
Synchronous Rectification    
Enable
Light Load Efficiency
Synchronous Rectification    
            SWIFT     SWIFT       SWIFT          
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     D-CAP2     D-CAP2    
2     2     2     2     2     3.5     2     2     2     2     2     2     2    
Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog    
      -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     -40 to 85    
8SO PowerPAD
8WSON    
8SO PowerPAD
8WSON    
8SO PowerPAD
8WSON    
8SO PowerPAD
8WSON    
8SO PowerPAD
8WSON    
8SO PowerPAD
8SOIC    
10VSON
8SO PowerPAD    
10VSON
8SO PowerPAD    
8SO PowerPAD     10VSON
8SO PowerPAD
8SOIC    
8SO PowerPAD     10VSON
8SO PowerPAD    
8SO PowerPAD    
1.40 | 1ku     1.57 | 1ku     1.25 | 1ku     1.25 | 1ku     1.12 | 1ku     0.60 | 1ku     0.75 | 1ku     0.73 | 1ku     0.73 | 1ku     0.63 | 1ku     1.17 | 100u     0.61 | 1ku     0.75 | 1ku    
WEBENCH® LM5018
    Min   Max   Range  
  Vin V V    9.00 – 100.00V  
  Vout1 V    1.25 – 100.00V  
  Iout1 A    ≤ 0.3A  

  Vout2 V     
  Iout2 A     

  Ambient Temp °C    ≤ 100°C  
Footprint BOM Cost Efficiency
 
 
 
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What are WEBENCH® tools?

Companion parts

Part # Name Product Family Comments
LM25018   7.5-48V Wide Vin, 300mA Constant On-Time Synchronous Buck Regulator   CONVERTER (INTEGRATED SWITCH) - STEP-DOWN (BUCK) CONVERTER    
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