LM25574-Q1 42V, 0.5A Step-Down Switching Regulator | TI.com

LM25574-Q1 (ACTIVE)

42V, 0.5A Step-Down Switching Regulator


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  • LM43600-Q1  -  3.5 to 36V, 500mA synchronous step-down voltage regulator - high efficiency, low quiescent current, smaller solution size


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 converters (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
6     6     6     6    
42     42     42     75    
1.23     1.23     1.23     1.23    
40     40     40     70    
0.5     1.5     3     0.5    
1     1     1     1    
50     50     50     50    
1000     1000     1000     500    
1     1     1     1    
Frequency Synchronization     Frequency Synchronization     Frequency Synchronization     Enable    
Current Mode     Current Mode     Current Mode     Current Mode    
95     95     95     95    
-40 to 125     -40 to 125     -40 to 125     -40 to 125    
Automotive     Automotive     Automotive     Automotive    
TSSOP | 16     HTSSOP | 16     HTSSOP | 20     TSSOP | 16    
Converter     Converter     Converter     Converter    

Design tool

WEBENCH® Power Designer is now even easier to use. Try it now.

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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