LM25574-Q1 (ACTIVE)

42V, 0.5A Step-Down Switching Regulator

42V, 0.5A Step-Down Switching Regulator - LM25574-Q1

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The LM25574-Q1 is an easy to use buck regulator which allows design engineers to design and optimize a robust power supply using a minimum set of components. Operating with an input voltage range of 6 V to 42 V, the LM25574-Q1 delivers 0.5-A of continuous output current with an integrated 750-mΩ N-Channel MOSFET. The regulator utilizes an Emulated Current Mode architecture which provides inherent line regulation, tight load transient response, and ease of loop compensation without the usual limitation of low-duty cycles associated with current mode regulators. The operating frequency is adjustable from 50 kHz to 1-MHz to allow optimization of size and efficiency. To reduce EMI, a frequency synchronization pin allows multiple IC’s from the LM(2)557x family to self-synchronize or to synchronize to an external clock. The LM25574-Q1 guarantees robustness with cycle-by-cycle current limit, short-circuit protection, thermal shut-down, and remote shut-down. The device is available in a TSSOP-16 package.


  • Qualified for Automotive Applications
  • AEC-Q100 Qualified With the Following Results:
    • Device Temperature Grade 1: –40°C to +125°C Ambient Operating Temperature
  • Integrated 42-V, 750-mΩ N-Channel MOSFET
  • Ultra-Wide Input Voltage From 6 V to 42 V
  • Adjustable Output Voltage as Low as 1.225 V
  • 1.5% Feedback Reference Accuracy
  • Operating Frequency Adjustable Between 50 kHz and 1 MHz With Single Resistor
  • Master or Slave Frequency Synchronization
  • Adjustable Soft-Start
  • Emulated Current Mode Control Architecture
  • Wide Bandwidth Error Amplifier
  • Built-In Protection
  • TSSOP-16 Package
  • Create a Custom Design Using the LM25574-Q1 With the WEBENCH® Power Designer

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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)
Control Mode
Duty Cycle (Max) (%)
Operating Temperature Range (C)
Package Group
LM25574-Q1 LM25575-Q1 LM25576-Q1 LM5574-Q1 LM5576-Q1
6    6    6    6    6   
42    42    42    75    75   
1.23    1.23    1.23    1.23    1.23   
40    40    40    70    70   
0.5    1.5    3    0.5    3   
1    1    1    1    1   
50    50    50    50    50   
1000    1000    1000    500    500   
1    1    1    1    1   
Frequency Synchronization    Frequency Synchronization    Frequency Synchronization    Enable    Enable   
Current Mode    Current Mode    Current Mode    Current Mode    Current Mode   
95    95    95    95    95   
-40 to 125    -40 to 125    -40 to 125    -40 to 125    -40 to 125   
Automotive    Automotive    Automotive    Automotive    Automotive   

Other qualified versions of LM25574-Q1

Version Part Number Definition
Catalog LM25574 TI's standard catalog product
New! Interactive Design
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WEBENCH® Designer LM25574-Q1

  Min   Max Range
Vin  V 6.0 to 42.0V
Vout  V -32 to 42V
Iout  A ≤ 0.5A
Ambient Temp  °C -40 to 125°C

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