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 device 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 device is available in WSON-8 and SO PowerPAD-8 plastic packages.

Features

  • Wide 7.5- to 100-V Input Range
  • Integrated 300-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:
    • WSON-8
    • SO PowerPAD™-8

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Parametrics Compare all products in Step-Down (Buck) Converter

 
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) (%)
Compensation
Special Features
Control Mode
Vref Accuracy (Typ) (%)
Rating
Pin/Package
Approx. Price (US$)
LM5018
7.5    
100    
1.25    
90    
0.3    
Buck    
1000    
0.7    
1.75    
90    
Not Needed    
Adjustable UVLO
Synchronous Rectification    
Constant on-time (COT)    
2    
Catalog    
8SO PowerPAD
8WSON    
1.40 | 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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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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