8A, 18V, High-Efficiency Step-Down Converter with Internally-Compensated Fast Current-Mode Control

The RTQ2838A is a high-performance, synchronous step-down converter that can deliver up to 8A output current with an input supply voltage range of 4V to 18V. The device integrates low R_DS(ON) power MOSFETs, an accurate 0.5V reference and an integrated diode for the bootstrap circuit to offer a very compact solution.The RTQ2838A adopts internally-compensated fast current mode (FCM) control architecture that provides fast transient response and further reduces the external-component count. The FCM operates at a truly fixed switching frequency over the line, load and output voltage range and makes the EMI filter design easier.The device offers a variety of functions for more design flexibility. The selectable switching frequency allows the RTQ2838A to meet various application requirements. An independent enable control input pin and a power-good indicator are provided for easy sequence control. The built-in spread-spectrum frequency modulation further helps systems designers with better EMI management.Full protection features are also integrated in the device for increased reliability, including input UVLO, cycle-by-cycle current limit, OVP, UVP, OTP and selectable soft-start time to control the inrush current during the startup.The RTQ2838A is available in a thermally enhanced WQFN-14L 3x2.5 (FC) package. The recommended junction temperature range is -40°C to 150°C.