RTQ2806/12/20A ACOT® High-Efficiency Synchronous Step-Down Converters

Richtek's RTQ2806/12/20A are high-performance, synchronous step-down converters that can deliver up to 20 A output current with a wide input supply voltage range of 3.5 V to 17 V. The devices integrate low R_DS(ON) power MOSFETs, an accurate 0.6 V ±1% reference over the full operating junction temperature range, and an integrated diode for the bootstrap circuit, offering a very compact solution.

The RTQ2806/12/20A adopts an advanced constant-on time (ACOT) control architecture that provides excellent transient performance and reduces the count of external components. The ACOT can operate at nearly constant switching frequency over line, load, and output voltage ranges in steady states, making the EMI filter design easier.

The devices offer a variety of functions to provide more design flexibility. The selectable switching frequency, current limit level, and PWM operating modes make these easy to use over a wide application range. An independent enable control input pin and power good indicator are also provided for easy sequence control. The device provides a programmable soft start-up by an external capacitor connected to the SS/TR pin to control the inrush current during start-up.

These converters provide complete protection functions, including input undervoltage lockout, output undervoltage protection, output overvoltage protection, overcurrent protection, and thermal shutdown. The RTQ2806/12/20A devices are available in two package types. The recommended junction temperature range is -40°C to +150°C.