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 Buck Converter (Integrated Switch)

 
Vin (Min) (V)
Vin (Max) (V)
Vout (Min) (V)
Vout (Max) (V)
Iout (Max) (A)
Regulated Outputs (#)
Switching Frequency (Min) (kHz)
Switching Frequency (Max) (kHz)
Iq (Typ) (mA)
Special Features
Control Mode
Duty Cycle (Max) (%)
Operating Temperature Range (C)
Rating
Package Group
Approx. Price (US$)
LM25019 LM25011 LM25011-Q1 LM25018 LM5009 LM5165 LM5165-Q1 TPS54061 TPS54061-Q1 TPS54062
7.5     6     6     7.5     9.5     3     3     4.7     4.7     4.7    
48     42     42     48     95     65     65     60     60     60    
1.25     2.51     2.51     1.25     2.5     1.23     1.23     0.8     0.8     0.8    
40     40     40     40     85     65     65     58     58     58    
0.1     2     2     0.3     0.15     0.15     0.15     0.2     0.2     0.05    
1     1     1     1     1     1     1     1     1      
50     50     50     50     50     50     50     50     50     100    
1000     2000     2000     1000     600     600     600     1100     1100     400    
1.75     1.2     1.2     1.75     0.485     0.01     0.01     0.09     0.09     0.089    
Enable
Synchronous Rectification
UVLO Adjustable    
Adjustable Current Limit
Power Good    
Adjustable Current Limit
Power Good    
Enable
Synchronous Rectification
UVLO Adjustable    
Enable     Adjustable Current Limit
Enable
Light Load Efficiency
Power Good
Pre-Bias Start-Up
Synchronous Rectification
UVLO Adjustable    
Adjustable Current Limit
Enable
Light Load Efficiency
Power Good
Pre-Bias Start-Up
Synchronous Rectification
UVLO Adjustable    
Enable
Frequency Synchronization
Light Load Efficiency
Synchronous Rectification
UVLO Adjustable    
Enable
Frequency Synchronization
Light Load Efficiency
Synchronous Rectification
UVLO Adjustable    
Enable
Frequency Synchronization
Light Load Efficiency
Synchronous Rectification
UVLO Adjustable    
Constant on-time (COT)     COT with emulated ripple     COT with emulated ripple     Constant on-time (COT)       Constant on-time (COT)     Constant on-time (COT)     Current Mode     Current Mode     Current Mode    
90     99     99     90     99     100     100     98     98     98    
-40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 150     -40 to 150     -40 to 150     -40 to 150     -40 to 125    
Catalog     Catalog     Automotive     Catalog     Catalog     Catalog     Automotive     Catalog     Automotive     Catalog    
SO PowerPAD
WSON    
MSOP-PowerPAD     MSOP-PowerPAD     SO PowerPAD
WSON    
VSSOP
WSON    
VSON     VSON     SON     SON     SON
VSSOP    
0.81 | 1ku     0.95 | 1ku     1.40 | 1ku     1.12 | 1ku     1.10 | 1ku     1.35 | 1ku     1.58 | 1ku     1.04 | 1ku     1.30 | 1ku     0.88 | 1ku    
s

WEBENCH® Designer LM25019

  Min   Max Range
Vin  V 9.00 to 48.00V
Vout  V 1.25 to 48.00V
Iout  A ≤ 0.10A
Ambient Temp  °C ≤ 100°C
Isolated Output


Footprint BOM Cost Efficiency

 
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