Low Quiescent, High-Efficiency 3A ACOT® Synchronous Buck-Boost Converter with Power-Good Indicator

The RT6167 is a high-efficiency, single-inductor and ACOT^® (Advanced Constant On-Time) monolithic synchronous buck-boost converter that can deliver up to 3A output current from an input voltage range of 2.2V to 5.5V. It can 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 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.Users can select two output voltages of the 128 types in Table 2, when the VSEL pin is in the low and high states, respectively. The RT6167 employs specific switching methods by adjusting the MODE pin. When set to low, the RT6167 operates in automatic PFM (Pulse Frequency Modulation) mode, featuring a low quiescent current design with a typical value of 2μA, maintaining high efficiency during light load operation. At higher loads, the device automatically switches to a 2.2MHz fixed frequency control, effectively smoothing out the switching ripple voltage with small package filtering elements. The integrated low R_DS(ON) power MOSFETs exhibit excellent efficiency under heavy load conditions. In shutdown mode, the supply current is typically 0.1μA, contributing to reduce power consumption. If acoustic noise is a concern or a fixed frequency operation is required, the RT6167 can operate in either Ultra-Sonic Mode (USM) or Forced PWM Mode (FPWM). The RT6167 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.