3-A Boost Converter with 0.5-V Ultra Low Input Voltage

3-A Boost Converter with 0.5-V Ultra Low Input Voltage  - TPS61021A


The TPS61021A provides a power supply solution for portable or smart devices powered by alkaline, NiMH, Li-Mn, or Li-ion batteries. The TPS61021A is capable of outputting 3.3-V voltage and 1.5-A current from a battery discharged to as low as 1.8 V. Capable of operating with 0.5-V input voltage enables the TPS61021A to extend the battery run time.

The TPS61021A operates at 2-MHz switching frequency at heavy load and enters power-save mode at light load to maintain high efficiency over the entire load current range. The device only consumes a 17-µA quiescent current from VOUT in light load condition. During shutdown, the load is completely disconnected from the input. In addition, The TPS61021A provides 4.35-V output overvoltage protection, output short circuit protection, and thermal shutdown protection.

The TPS61021A offers a very small solution size due to low count of external components. It allows the use of small inductors and output capacitors with the 2-MHz switching frequency.

The TPS61021A is available in 2.0-mm × 2.0-mm WSON package.


  • Input Voltage Range: 0.5 V to 4.4 V
  • 0.9 V Minimum Input Voltage for Startup
  • Output Voltage Setting Range: 1.8 V to 4.0 V
  • 91% Efficiency at VIN = 2.4 V, VOUT = 3.3 V and
    IOUT = 1.5 A
  • 2.0-MHz Switching Frequency
  • IOUT > 1.5 A at VOUT = 3.3 V when VIN > 1.8 V
  • 17-µA Typical Quiescent Current
  • ±2.5% Reference Voltage Accuracy over –40°C to
  • PFM Operation Mode at Light Load
  • True Disconnection Between Input and Output
    During Shutdown
  • Output Over Voltage Protection
  • Output Short Circuit Protection
  • Thermal Shutdown Protection
  • 2-mm × 2-mm WSON Package

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Parametrics Compare all products in Boost Converter (Integrated Switch)

Vin (Min) (V)
Vin (Max) (V)
Vout (Min) (V)
Vout (Max) (V)
Switch Current Limit (Typ) (A)
Regulated Outputs (#)
Iq (Typ) (mA)
Duty Cycle (Max) (%)
Operating Temperature Range (C)
Package Group
Light Load Efficiency
Load Disconnect
Synchronous Rectification   
-40 to 125   
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WEBENCH® Designer TPS61021A

  Min   Max Range
Vin  V 0.5 to 3.6V
Vout  V 1.8 to 4V
Iout  A ≤ 3A
Ambient Temp  °C -40 to 125°C

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