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


Product details


Topology Buck-Boost Vin (Min) (V) 2.3 Vin (Max) (V) 5.5 Vout (Min) (V) 1 Vout (Max) (V) 5.5 Switch current limit (Typ) (A) 4.5 Duty cycle (Max) (%) 100 Features Enable, Light Load Efficiency, Output Discharge Switching frequency (Min) (kHz) 2500 Switching frequency (Max) (kHz) 2500 Type Converter Iq (Typ) (mA) 0.035 Rating Catalog Iout (Max) (A) 2 Operating temperature range (C) -40 to 85 open-in-new Find other Buck-boost, inverting & split-rail converters (integrated switch)

Package | Pins | Size

DSBGA (YFF) 25 5 mm² 2.126 x 2.108 open-in-new Find other Buck-boost, inverting & split-rail converters (integrated switch)


  • 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
open-in-new Find other Buck-boost, inverting & split-rail converters (integrated switch)


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.

open-in-new Find other Buck-boost, inverting & split-rail converters (integrated switch)

Technical documentation

Design & development

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Hardware development

document-generic User guide
The TPS63027EVM-870 is designed to help the user easily evaluate and test the operation and functionality of the TPS63027 Buck-Boost Converter. The EVM operates from 2.3-V to 5.5V-V input voltage. The output voltage is set to 3.3V. Output currents can go up to 4 A. The TPS63027 comes in a small 2.12 (...)
  • Input Voltage Range: 2.3 V to 5.5 V
  • Output Voltage Range: 1.0 V to 5.5 V
  • Output Current up to 2A in Boost mode and 4 A in Buck mode
  • Efficiency up to 95% in Buck or Boost Mode and up to 96% when VIN=VOUT
  • 2.5MHz Typical Switching Frequency

Design tools & simulation

SLVMBX2A.ZIP (76 KB) - PSpice Model

CAD/CAE symbols

Package Pins Download
DSBGA (YFF) 25 View options

Ordering & quality

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Lowering Noise in Battery Powered Applications with New Buck-Boost Mode Transition

This video shows how to avoid noise caused by mode changes common in battery powered applications when using buck-boost converters.

Posted: 30-Jan-2019
Duration: 04:40

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