RTQ2158-QA ACOT® Buck Converter

Richtek's RTQ2158 is a high-performance, advanced constant on-time (ACOT) monolithic synchronous step-down DC/DC converter that can deliver up to 8 A output current from a 2.85 V to 6.5 V input supply. The device integrates low R_DS(ON) power MOSFETs, accurate 0.6 V reference, and an integrated diode of bootstrap circuit to offer a very compact solution.

The RTQ2158 adopts ACOT control architecture that provides ultrafast transient response and further reduces the external-component count. In steady states, the ACOT operates in nearly constant switching frequency over line, load, and output voltage ranges and makes the EMI filter design easier.

The device offers an independent enable control input pin and power good indicator for easy sequence control. To control the inrush current during the startup, the device provides a programmable soft start-up by an external capacitor connected to the SS pin. Full protection features are also integrated into the device including the cycle-by-cycle current limit control, UVP, input UVLO, and OTP. The RTQ2158-QA is available in a thermally-enhanced WET-WQFN-21L 4 x 4 (FC) package.