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 Buck Converter (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)
Special Features
Control Mode
Duty Cycle (Max) (%)
Operating Temperature Range (C)
Package Group
Approx. Price (US$)
TPS5420 TPS5410 TPS5430 TPS5450
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    
1     1     1     1    
500     500     500     500    
500     500     500     500    
3     3     3     3    
Enable     Enable     Enable     Enable    
Voltage Mode     Voltage Mode     Voltage Mode     Voltage Mode    
87     87.5     87     89    
-40 to 125     -40 to 125     -40 to 125     -40 to 125    
Catalog     Catalog     Catalog     Catalog    
SOIC     SOIC     SO PowerPAD     SO 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
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WEBENCH® Designer TPS5420

  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

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