Tiny 4A switch single-inductor buck-boost converter

Suitable for applications where the input voltage is higher or lower than the output, the Texas Instruments TPS63025x consists of high-efficiency, low quiescent current buck-boost converters. Available now from Farnell element14, the device's output currents can go as high as 2A in boost mode and up to 4A in buck mode, with the maximum average current being typically limited to 4A. The TPS63025x 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 that utilises synchronous rectification to obtain highest efficiency. The converter enters Power Save Mode on low load currents to maintain high efficiency over the complete load current range. A PFM/PWM pin allows the user to choose between automatic PFM/PWM mode operation and forced PWM operation. During PWM mode a fixed frequency, typically 2.5MHz, is used. The output voltage is programmable using an external resistor divider or may be fixed internally on the chip. The converters can be disabled to minimise battery drain. The device is available in a 20-pin WCSP package measuring 1.766mm × 2.086mm or a 14-pin HotRod package measuring 2.5mm × 3mm.