SIMPLE SWITCHER® 75V, 0.5A Step-Down Switching Regulator - LM5574


SIMPLE SWITCHER® 75V, 0.5A Step-Down Switching Regulator

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The LM5574 is an easy to use SIMPLE SWITCHER® 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 - 75V, the LM5574 delivers 0.5A of continuous output current with an integrated 750mΩ 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 50kHz to 500kHz 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 LM5574 ensures 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. The LM5574 is supported by the full suite of WEBENCH On-Line design tools.


  • LM5574-Q1 is an Automotive Grade Product that is AEC-Q100 Grade 1 Qualified (−40°C to + 125°C Operating Junction Temperature)
  • Integrated 75V, 750mΩ N-channel MOSFET
  • Ultra-Wide Input Voltage Range from 6V to 75V
  • Adjustable Output Voltage as Low as 1.225V
  • 1.5% Feedback Reference Accuracy
  • Operating Frequency Adjustable Between 50kHz and 500kHz with Single Resistor
  • Master or Slave Frequency Synchronization
  • Adjustable Soft-Start
  • Emulated Current Mode Control Architecture
  • Wide Bandwidth Error Amplifier
  • Built-in Protection
  • Automotive Grade Product Datasheet that is AEC-Q100 Grade 0 Qualified is Available Upon Request
    • (−40°C to + 150°C Operating Junction Temperature)


  • TSSOP-16

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

Regulated Outputs (#)
Vin (Min) (V)
Vin (Max) (V)
Vout (Min) (V)
Vout (Max) (V)
Iout (Max) (A)
Switching Frequency (Max) (kHz)
Switch Current Limit (Typ) (A)
Iq (Typ) (mA)
Duty Cycle (Max) (%)
Soft Start
Special Features
Control Mode
Vref Accuracy (Typ) (%)
Operating Temperature Range (C)
Approx. Price (US$)
LM5574 LM5575 LM5576 LMR14030
1     1     1     1    
6     6     6     4    
75     75     75     40    
1.23     1.23     1.23     1    
70     70     70     36    
0.5     1.5     3     3.5    
Buck     Buck     Buck     Buck
Inverting Buck-Boost    
500     500     500     2500    
0.7     2.1     4.2     5.5    
1     1     1     0.04    
95     95     95     98    
Adjustable     Adjustable     Adjustable     Adjustable    
External     External     External     Internal    
Adjustable UVLO
Frequency Synchronization
Light Load Efficiency
Power Good
Pre-Bias Start-Up
Spread Spectrum
Current Mode     Current Mode     Current Mode     Current Mode    
1.5     1.5     1.5     1    
Catalog     Catalog     Catalog     Catalog    
-40 to 125     -40 to 125     -40 to 125     -40 to 125    
16TSSOP     16HTSSOP     20HTSSOP     8SO PowerPAD    
1.55 | 1ku     2.05 | 1ku     2.60 | 1ku     1.68 | 1ku    

Other qualified versions of LM5574

Version Part Number Definition
Automotive LM5574-Q1 Q100 devices qualified for high-reliability automotive applications targeting zero defects

Related end equipment

  • Automotive
  • Industrial

New! Interactive Design
Click to instantly view a schematic, charts, Bill of Materials, and Operating Values.
    Min   Max   Range  
  Vin V 6.0 to 75.0V  
  Vout V 1.23 to 75.0V  
  Iout A ≤ 0.5A  
  Ambient Temp °C -40 to 125°C  
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