1 Features

1• 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 x 2.1 mm, 25-pin WCSP

2 Applications

• Cellular Phones, Smart Phones

• Tablets PC

• PC and Smart Phone accessories

• Point of Load Regulation

• Battery Powered Applications

3 Description

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-widthmodulation

(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 x 2.1 mm.