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


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

Recommended alternative parts

  • LM25574  -  42V Input Voltage Max, 0.5A Output Current
  • LM5574-Q1  - The device has SIMILAR FUNCTIONALITY but is not functionally equivalent to the compared device. 
  • LM25574-Q1  -  42V Input Voltage Max, 0.5A Output Current
  • LM25575  -  42V Input Voltage Max, 1.5A Output Current
  • LM25575-Q1  -  42V Input Voltage Max, 1.5A Output Current
  • LM25576  -  42V Input Voltage Max, 3A Output Current
  • LM25576-Q1  -  42V Input Voltage Max, 3A Output Current
  • LM5575  -  75V Input Voltage Max, 1.5A Output Current
  • LM5575-Q1  -  75V Input Voltage Max, 1.5A Output Current
  • LM5576  -  75V Input Voltage Max, 3A Output Current
  • LM5576-Q1  -  75V Input Voltage Max, 3A Output Current


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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  LM5574 Compare
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Regulated Outputs (#) 1
Vin (Min) (V) 6
Vin (Max) (V) 75
Vout (Min) (V) 1.23
Vout (Max) (V) 70
Iout (Max) (A) 0.5
Iout2 (Max) (A) -
Vout2 (Min) (V) -
Vout2 (Max) (V) -
Topology Buck
  • Boost
  • Buck
  • Buck-Boost
  • Inverting Buck-Boost
Switching Frequency (Max) (kHz) 500
Switch Current Limit (Typ) (A) 0.7
Iq (Typ) (mA) 1
Duty Cycle (Max) (%) 95
Soft Start Adjustable
  • Adjustable
  • Fixed
  • None
Compensation External
  • External
  • Internal
  • Not Needed
Special Features Enable
  • Adjustable Current Limit
  • Adjustable UVLO
  • Dynamic Voltage Scaling
  • Enable
  • Frequency Synchronization
  • Light Load Efficiency
  • Phase Interleaving
  • Power Good
  • Synchronous Rectification
  • Tracking
Control Mode Current Mode
  • COT with emulated ripple
  • Constant on-time (COT)
  • Current Mode
  • D-CAP
  • D-CAP+
  • D-CAP2
  • D-CAP3
  • Voltage Mode
Preset Vout (V) -
Vref Accuracy (Typ) (%) 1.5
Rating Catalog
  • Automotive
  • Catalog
  • HiRel Enhanced Product
  • High Temp
  • Military
  • Space
Operating Temperature Range (C) -40 to 125 °C to °C
Approx. Price (US$) 1.55 | 1ku
Package Group TSSOP
  • CFP
  • DDPAK/TO-263
  • MSOP-PowerPAD
  • PDIP
  • QFN
  • SO PowerPAD
  • SOIC
  • SON
  • SOT
  • SOT-23
  • TO-220
  • TO-263
  • USON
  • VQFN
  • VSON
  • WQFN
  • WSON
  Sample & Buy Reset Update

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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

    Min   Max   Range  
  Vin V    6.00 – 75.00V  
  Vout V    -65.00 – 75.00V  
  Iout A    ≤ 0.5A  
  Ambient Temp °C    -40 – 125°C  
Footprint BOM Cost Efficiency
'U1 D1 L1 Cramp Cboot Rt Cbyp Css Rfb1 Rfb2 Cout Cin Rcomp Ccomp '
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