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 is available in WSON-8 and SO Power PAD-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 Power PAD-8

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

  LM5019 Compare
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Regulated Outputs (#) 1
Vin (Min) (V) 7.5
Vin (Max) (V) 100
Vout (Min) (V) 1.25
Vout (Max) (V) 90
Iout (Max) (A) 0.1
Iout2 (Max) (A) -
Vout2 (Min) (V) -
Vout2 (Max) (V) -
Topology Buck
  • Boost
  • Buck
  • Buck-Boost
  • Inverting Buck-Boost
Switching Frequency (Max) (kHz) 1000
Switch Current Limit (Typ) (A) 0.3
Iq (Typ) (mA) 1.75
Duty Cycle (Max) (%) 90
Soft Start -
  • Adjustable
  • Fixed
  • None
Compensation Not Needed
  • External
  • Internal
  • Not Needed
Special Features Adjustable UVLO
Synchronous Rectification
  • Adjustable Current Limit
  • Adjustable UVLO
  • Dynamic Voltage Scaling
  • Enable
  • Frequency Synchronization
  • Light Load Efficiency
  • Phase Interleaving
  • Power Good
  • Synchronous Rectification
  • Tracking
Control Mode Constant on-time (COT)
  • COT with emulated ripple
  • Constant on-time (COT)
  • Current Mode
  • D-CAP
  • D-CAP+
  • D-CAP2
  • D-CAP3
  • Voltage Mode
Preset Vout (V) -
Vref Accuracy (Typ) (%) 2
Rating Catalog
  • Automotive
  • Catalog
  • HiRel Enhanced Product
  • High Temp
  • Military
  • Space
Operating Temperature Range (C) - °C to °C
Approx. Price (US$) 1.25 | 1ku
Package Group SO PowerPAD
WSON
  • CFP
  • DDPAK/TO-263
  • DSBGA
  • DSLGA
  • HTSSOP
  • LQFN-CLIP
  • LSON-CLIP
  • MSOP-PowerPAD
  • PDIP
  • QFN
  • SO PowerPAD
  • SOIC
  • SON
  • SOT
  • SOT-23
  • TO-220
  • TO-263
  • TSSOP
  • USON
  • VQFN
  • VQFN-CLIP
  • VSON
  • VSSOP
  • WQFN
  • WSON
  • XCEPT
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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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