4.5-V to 28-V Input, 3-A Output, EMI Friendly Synchronous Step-Down Converter



The TPS54302 is a 4.5-V to 28-V input voltage range, 3-A synchronous buck converter. The device includes two integrated switching FETs, internal loop compensation and 5-ms internal soft start to reduce component count.

By integrating the MOSFETs and employing the SOT-23 package, the TPS54302 achieves the high power density and offers a small footprint on the PCB.

Advanced Eco-mode implementation maximizes the light load efficiency and reduces the power loss.

In the TPS54302, the frequency spread spectrum operation is introduced for EMI reduction.

Cycle-by-cycle current limit in both high-side MOSFET protects the converter in an overload condition and is enhanced by a low-side MOSFET freewheeling current limit which prevents current runaway. Hiccup mode protection is triggered if the overcurrent condition has persisted for longer than the present time.


  • 4.5-V to 28-V Wide Input Voltage Range
  • Integrated 85-mΩ and 40-mΩ MOSFETs for 3-A, Continuous Output Current
  • Low 2-μA Shutdown, 45-μA Quiescent Current
  • Internal 5-mS Soft-Start
  • Fixed 400-kHz Switching Frequency
  • Frequency Spread Spectrum to Reduce EMI
  • Advanced Eco-mode Pulse Skip
  • Peak Current Mode Control
  • Internal Loop Compensation
  • Overcurrent Protection for Both MOSFETs with Hiccup Mode Protection
  • Over Voltage Protection
  • Thermal Shutdown
  • SOT-23 (6) 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)
Control Mode
Duty Cycle (Max) (%)
Operating Temperature Range (C)
Package Group
TPS54302 TPS5402 TPS5405 TPS54308 TPS54331 TPS54335A
4.5    3.5    6.8    4.5    3.5    4.5   
28    28    28    28    28    28   
0.6    0.8    4.85    1    0.8    0.8   
26    26    5.15    26    25    25   
3    1.7    2    3    3    3   
1    1    1    1    1    1   
400    50    50    350    570    50   
400    1100    1100    350    570    1500   
0.04    0.1    100    0.3    0.11    0.6   
Light Load Efficiency
Pre-Bias Start-Up
Synchronous Rectification
UVLO Adjustable   
Light Load Efficiency    Light Load Efficiency    Enable
Forced Pulse Width Modulation (FPWM) Mode
Pre-Bias Start-Up
Synchronous Rectification
UVLO Adjustable   
Light Load Efficiency
UVLO Adjustable   
Light Load Efficiency
Synchronous Rectification
UVLO Adjustable   
Current Mode    Current Mode    Current Mode    Current Mode    Current Mode    Current Mode   
100    93    93    100    90    90   
-40 to 85    -40 to 125    -40 to 85    -40 to 125    -40 to 150    -40 to 150   
Catalog    Catalog    Catalog    Catalog    Catalog    Catalog   
SOT-23-THIN    SOIC    SOIC    SOT-23-THIN    SO PowerPAD
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WEBENCH® Designer TPS54302

  Min   Max Range
Vin  V 4.5 to 28.0V
Vout  V 0.6 to 25.0V
Iout  A ≤ 3A
Ambient Temp  °C -40 to 85°C

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