High Efficiency 4.5A Switch Single-Inductor Buck-Boost Converter

High Efficiency 4.5A Switch Single-Inductor Buck-Boost Converter - TPS63027


The TPS63027 is a high efficiency, low quiescent current buck-boost converters suitable for application where the input voltage is higher or lower than the output. Output currents can go as high as 2 A in boost mode and as high as 4 A in buck mode. The maximum average current in the switches is limited to a typical value of 4.5 A. The TPS63027 regulates the output voltage over the complete input voltage range by automatically switching between buck or boost mode depending on the input voltage ensuring a seamless transition between modes. The buck-boost converter is based on a fixed frequency, pulse-width-modulation (PWM) controller using synchronous rectification to obtain highest efficiency. At low load currents, the converter enters Power Save Mode to maintain high efficiency over the complete load current range. There is a PFM/PWM pin that allows the user to choose between automatic PFM/PWM mode operation and forced PWM operation. During PWM mode a fixed-frequency of typically 2.5 MHz is used. The output voltage is programmable using an external resistor divider, or is fixed internally on the chip. The converter can be disabled to minimize battery drain. During shutdown, the load is disconnected from the battery. The device is packaged in a 25-pin WCSP package measuring 2.1 mm × 2.1 mm.


  • Real Buck or Boost Operation with Automatic and Seamless Transition Between Buck and Boost Operation
  • 2.3 V to 5.5 V Input Voltage Range
  • 1.0V to 5.5V Output Voltage Range
  • 2 A Continuous Output Current : VIN≥ 2.5 V, VOUT= 3.5 V
  • Efficiency up to 96%
  • 2.5MHz Typical Switching Frequency
  • 35-µA Operating Quiescent Current
  • Integrated Soft Start
  • Power Save Mode
  • True Shutdown Function
  • Output Capacitor Discharge Function
  • Over-Temperature Protection and Over-Current Protection
  • Wide Capacitance Selection
  • Small 2.1 mm × 2.1 mm, 25-pin WCSP

View more

Parametrics Compare all products in Buck/Boost, Inverting or Split-Rail Converter (Integrated Switch)

Vin (Min) (V)
Vin (Max) (V)
Vout (Min) (V)
Vout (Max) (V)
Switch Current Limit (Typ) (A)
Duty Cycle (Max) (%)
Switching Frequency (Min) (kHz)
Switching Frequency (Max) (kHz)
Iq (Typ) (mA)
Iout (Max) (A)
Operating Temperature Range (C)
Package Group
TPS63027 TPS630250 TPS63050
Buck/Boost    Buck/Boost    Buck/Boost   
2.3    2.3    2.5   
5.5    5.5    5.5   
1    2.3    2.5   
5.5    3.6    5.5   
4.5    4.5    1   
100    100    100   
2500    2500    2500   
2500    2500    2500   
0.035    0.035    0.045   
Light Load Efficiency
Output Discharge   
Light Load Efficiency
Load Disconnect
Output Discharge
Synchronous Rectification
UVLO Fixed   
Adjustable Current Limit
Light Load Efficiency
Load Disconnect
Power Good
Synchronous Rectification
UVLO Fixed   
2    2    0.5   
-40 to 85    -40 to 85    -40 to 85   
Catalog    Catalog    Catalog   

Featured tools and software

New! Interactive Design
Click to instantly view a schematic, charts, Bill of Materials, and Operating Values.

WEBENCH® Designer TPS63027

  Min   Max Range
Vin  V 2.3 to 5.5V
Vout  V 1 to 5.5V
Iout  A ≤ 4A
Ambient Temp  °C -40 to 85°C

Footprint BOM Cost Efficiency

Preview design