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    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   
Synchronous Rectification
UVLO Adjustable   
Adjustable Current Limit    Adjustable Current Limit    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)    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    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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