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

LM5574 (ACTIVE)

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

Recommended alternative parts

  • LM46000  - The device has SIMILAR FUNCTIONALITY but is not functionally equivalent to the compared device.   Synchronous 60V, 500mA Regulator - Higher efficiency, Low Quiescent Current, Smaller Solution Size

Description

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.

Features

  • 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)

Package

  • 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)
Topology
Switching Frequency (Max) (kHz)
Switch Current Limit (Typ) (A)
Iq (Typ) (mA)
Duty Cycle (Max) (%)
Soft Start
Compensation
Special Features
Brand
Control Mode
Vref Accuracy (Typ) (%)
Rating
Operating Temperature Range (C)
Pin/Package
Approx. Price (US$)
LM5574 LM25575 LM25576 LM5575 LM5576
1     1     1     1     1    
6     6     6     6     6    
75     42     42     75     75    
1.23     1.23     1.23     1.23     1.23    
70     40     40     70     70    
0.5     1.5     3     1.5     3    
Buck     Buck     Buck     Buck     Buck    
500     1000     1000     500     500    
0.7     2.1     4.2     2.1     4.2    
1     1     1     1     1    
95     95     95     95     95    
Adjustable     Adjustable     Adjustable     Adjustable     Adjustable    
External     External     External     External     External    
Enable
Tracking    
Enable
Tracking    
Enable
Tracking    
Enable
Tracking    
Enable
Tracking    
SIMPLE SWITCHER     SIMPLE SWITCHER     SIMPLE SWITCHER     SIMPLE SWITCHER     SIMPLE SWITCHER    
Current Mode       Current Mode     Current Mode     Current Mode    
1.5     1.5     1.5     1.5     1.5    
Catalog     Catalog     Catalog     Catalog     Catalog    
-40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125    
16TSSOP     16HTSSOP     20HTSSOP     16HTSSOP     20HTSSOP    
1.55 | 1ku     1.60 | 1ku     2.00 | 1ku     2.05 | 1ku     2.60 | 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.
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WEBENCH® LM5574
    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  
Footprint BOM Cost Efficiency
 
   
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