Low Quiescent, High Efficiency 3A Buck-Boost Converter with I²C Interface

The RT6160A is a high-efficiency, single inductor and Advanced Constant On-Time (ACOT^®) monolithic synchronous Buck-Boost converter that can deliver up to 3A of output current from 2.2V to 5.5V. It can well regulate the digitally programmable output voltage from 2.025V to 5.2V, making it suitable for a wide range of input supply applications, regardless of whether the input voltage is lower, higher than, or even equal to the output voltage. The ACOT^® control architecture features outstanding line/load transient response, seamless transition between buck and boost modes, and provides stable operation with small ceramic output capacitors without the need for complicated external compensation.The RT6160A features an I²C interface, which allows for programmable output voltage, ultra-sonic mode control, soft-start slew-rate adjustment, and device status monitoring. The target output voltage can also be switched through the external VSEL pin to perform dynamic voltage scaling (DVS), and the ramp-up slew-rate and ramp mode of DVS can also be set by configuring the related registers.The RT6160A operates with automatic PFM and has a low quiescent current design of typically 2μA, maintaining high efficiency during light load operation.At higher loads, the device automatically switches to a 2.2MHz fixed frequency control, which easily smooths out the switching ripple voltage with small package filtering elements. And the integrated low R_DS(ON) power MOSFETs features excellent efficiency under heavy load conditions. In shutdown mode, the supply current is typically 0.1μA, excellent in reducing power consumption. PFM mode can be disabled if fixed frequency is desired. The RT6160A is available in a small WL-CSP-15B 1.4x2.3 (BSC) package.The recommended junction temperature range is -40°C to 125°C, and the ambient temperature range is -40°C to 85°C.