1 Features

• VLOW voltage range: 0.5V to 23V

– The minimum VLOW voltage is determined by

the VLOW/VHIGH ratio and frequency

• VHIGH voltage range: 4.5V to 25V

• Pin selectable bidirectional buck or boost mode

• Buck/boost forced PWM mode operation

• High efficiency and power capability

– Programmable current limit: 5A to 20A

– Integrated 8.5mΩ high-side MOSFET

• Switching frequency

– FSW 250kHz when VLOW > 1.7V

– FSW down to 100kHz when VLOW < 1.5V

– FSW down to 50kHz when VLOW < 0.5V

– 200mV hysteresis prevents frequency jitter

• Synchronization capability to external clock

• Rich protection

– VHIGH overvoltage protection at 27V

– VHIGH undervoltage protection at 3.1V

– VCC undervoltage protection at 2.15V

– Precise EN/UVLO threshold

– Cycle-by-cycle overcurrent protection

– Thermal shutdown

• 2.5mm × 3.0mm VQFN 14 HotRod™ Lite package

2 Applications

• Battery Testing System (BTS)

• Super-cap or battery backup power converter

• USB Type-C® power delivery

3 Description

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 device provides an excellent balance

of efficiency, thermal dissipation and solution size for

high power bidirectional conversion.

The TPS61289 offers adjustable switching current

limit function. In addition, the device provides VHIGH

overvoltage and undervoltage protection, cycle-bycycle

overcurrent protection, and thermal shutdown

protection.

The TPS61289 offers a very small solution size with

2.5mm x 3.0mm VQFN HotRod™ Lite package with

minimal external components.