3.5V to 28V Input, 3A, 570kHz Step-Down Converter with Eco-mode

3.5V to 28V Input, 3A, 570kHz Step-Down Converter with Eco-mode - TPS54331

Recommended alternative parts

  • TPS54531  -  Looking for a device with more output current? Try the TPS54531.
  • TPS54339E  -  Looking for a device with lower input voltage? Try the TPS54339E.
  • TPS54231  -  Looking for a device with less output current? Try the TPS54231.
  • TPS54332  -  Looking for a device with higher switching frequency? Try theTPS54332.


The TPS54331 device is a 28-V, 3-A non-synchronous buck converter that integrates a low RDS(on) high-side MOSFET. To increase efficiency at light loads, a pulse skipping Eco-mode feature is automatically activated. Furthermore, the 1-µA shutdown supply-current allows the device to be used in battery-powered applications. Current mode control with internal slope compensation simplifies the external compensation calculations and reduces component count while allowing the use of ceramic output capacitors. A resistor divider programs the hysteresis of the input undervoltage lockout. An overvoltage transient protection circuit limits voltage overshoots during startup and transient conditions. A cycle-by-cycle current-limit scheme, frequency foldback and thermal shutdown protect the device and the load in the event of an overload condition. The TPS54331 device is available in an 8-pin SOIC package and 8-pin SO PowerPAD package that have been internally optimized to improve thermal performance.


  • 3.5 to 28-V Input Voltage Range
  • Adjustable Output Voltage Down to 0.8 V
  • Integrated 80-mΩ High-Side MOSFET
    Supports up to 3-A Continuous Output
  • High Efficiency at Light Loads With a
    Pulse Skipping Eco-mode™
  • Fixed 570 kHz Switching Frequency
  • Typical 1-µA Shutdown Quiescent
  • Adjustable Slow-Start Limits Inrush
  • Programmable UVLO Threshold
  • Overvoltage Transient Protection
  • Cycle-by-Cycle Current Limit, Frequency Fold
    Back, and Thermal Shutdown Protection
  • Available in Easy-to-Use SOIC8 Package or
    Thermally Enhanced SOIC8 PowerPAD™ Package
  • Supported by WEBENCH® Software Tool
    • Consumer Applications such as Set-Top Boxes,
      CPE Equipment, LCD Displays, Peripherals, and
      Battery Chargers
    • Industrial and Car-Audio Power Supplies
    • 5-V, 12-V, and 24-V Distributed Power Systems

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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)
Control Mode
Duty Cycle (Max) (%)
Operating Temperature Range (C)
Package Group
TPS54331 TPS54231 TPS54308 TPS54336A TPS54531
3.5    3.5    4.5    4.5    3.5   
28    28    28    28    28   
0.8    0.8    1    0.8    0.8   
25    25    26    25    25   
3    2    3    3    5   
1    1    1    1    1   
570    570    350    340    570   
570    570    350    340    570   
0.11    0.075    0.3    0.6    0.11   
Light Load Efficiency
UVLO Adjustable   
Light Load Efficiency
UVLO Adjustable   
Forced Pulse Width Modulation (FPWM) Mode
Pre-Bias Start-Up
Synchronous Rectification
UVLO Adjustable   
Light Load Efficiency
Synchronous Rectification
UVLO Adjustable   
Light Load Efficiency   
Current Mode    Current Mode    Current Mode    Current Mode    Current Mode   
90    90    100    90    90   
-40 to 150    -40 to 150    -40 to 125    -40 to 150    -40 to 85   
Catalog    Catalog    Catalog    Catalog    Catalog   
SOIC    SOT-23-THIN    SO PowerPAD
SO PowerPAD   

Other qualified versions of TPS54331

Version Part Number Definition
Automotive TPS54331-Q1 Q100 devices qualified for high-reliability automotive applications targeting zero defects
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WEBENCH® Designer TPS54331

  Min   Max Range
Vin  V 3.5 to 28.0V
Vout  V 0.8 to 25V
Iout  A ≤ 3A
Ambient Temp  °C -40 to 150°C

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