The TPS61289 is a bidirectional buck/boost synchronous converter that integrates the high side synchronous rectifier MOSFET and uses an external low side MOSFET. The TPS61289 can be configured as a buck or boost converter using the MODE pin. The TPS61289 can support 20A switching current and the VHIGH voltage supports up to 25V. The minimum VLOW voltage is determined by the VLOW/VHIGH ratio and frequency, for example, the VLOW voltage can support as low as 0.5V at the VHIGH = 15V condition.

The TPS61289 operates in buck mode when current is required to flow from the high voltage side to the low voltage side. Alternatively in boost mode when current is required to flow from the low voltage side to the high voltage side. This makes the TPS61289 applicable for high-current battery test systems that require battery charging and discharging under current and voltage loop control signals. And the use of rechargeable batteries in testing systems is becoming increasingly extensive. To initialize the rechargeable batteries, multiple charge and discharge cycles are required. In this process, the current and voltage of the battery must be accurately controlled. This design does not fully consider the accuracy requirements and focuses only on displaying the charge and discharge functions.