5.5V to 36V Input, 2A, 500kHz Step-Down Converter - TPS5420


5.5V to 36V Input, 2A, 500kHz Step-Down Converter

Recommended alternative parts

  • TPS54240  -  Recommended for new Designs – The TPS54240 has a higher Vin and is in a smaller thermally enhanced package.
  • TPS5410  -  1A pin compatible version of the TPS5420
  • TPS5430  -  3A pin compatible version of the TPS5430
  • TPS40200  -  4.5 to 52V DC/DC controller requiring external MOSFET


The TPS5420 is a high-output-current PWM converter that integrates a low resistance high side N-channel MOSFET. Included on the substrate with the listed features is a high performance voltage error amplifier that provides tight voltage regulation accuracy under transient conditions; an undervoltage-lockout circuit to prevent start-up until the input voltage reaches 5.5 V; an internally set slow-start circuit to limit inrush currents; and a voltage feed-forward circuit to improve the transient response. Using the ENA pin, shutdown supply current is reduced to 18 µA typically. Other features include an active-high enable, overcurrent limiting, overvoltage protection and thermal shutdown. To reduce design complexity and external component count, the TPS5420 feedback loop is internally compensated.

The TPS5420 device is available in an easy to use 8-pin SOIC package. TI provides evaluation modules and the Designer software tool to aid in quickly achieving high-performance power supply designs to meet aggressive equipment development cycles.


  • Wide Input Voltage Range: 5.5 V to 36 V
  • Up to 2-A Continuous (3-A Peak) Output Current
  • High Efficiency up to 95% Enabled by
    110-mΩ Integrated MOSFET Switch
  • Wide Output Voltage Range: Adjustable Down to 1.22 V
    with 1.5% Initial Accuracy
  • Internal Compensation Minimizes External Parts Count
  • Fixed 500-kHz Switching Frequency for Small Filter Size
  • Improved Line Regulation and Transient Response by
    Input Voltage Feed Forward
  • System Protected by Over Current Limiting, Over Voltage
    Protection and Thermal
  • –40°C to 125°C Operating Junction
    Temperature Range
  • Available in Small 8-Pin SOIC Package

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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$)
TPS5420 TPS5410 TPS5430 TPS5450
1     1     1     1    
5.5     5.5     5.5     5.5    
36     36     36     36    
1.23     1.23     1.23     1.22    
31     31     31     31    
2     1     3     5    
Buck     Buck     Buck
Inverting Buck-Boost    
500     500     500     500    
3     1.2     4     6    
3     3     3     3    
87     87.5     87     89    
Fixed     Fixed     Fixed     Fixed    
Internal     Internal     Internal     Internal    
Enable     Enable     Enable     Enable    
Voltage Mode     Voltage Mode     Voltage Mode     Voltage Mode    
1.5     1.5     1.5     1.5    
Catalog     Catalog     Catalog     Catalog    
-40 to 125     -40 to 125     -40 to 125     -40 to 125    
8SOIC     8SOIC     8SO PowerPAD     8SO PowerPAD    
1.70 | 1ku     1.60 | 1ku     1.85 | 1ku     2.25 | 1ku    

Other qualified versions of TPS5420

Version Part Number Definition
Enhanced Product TPS5420-EP Supports Defense, Aerospace and Medical Applications
Automotive TPS5420-Q1 Q100 devices qualified for high-reliability automotive applications targeting zero defects
New! Interactive Design
Click to instantly view a schematic, charts, Bill of Materials, and Operating Values.
    Min   Max   Range  
  Vin V 5.5 to 36.0V  
  Vout V 1.23 to 31.0V  
  Iout A ≤ 2A  
  Ambient Temp °C -40 to 125°C  
Footprint BOM Cost Efficiency
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