XR79120 Datasheet | Exar

22V, 20A Synchronous Step Down COT Power Module General Description The XR79120 is a 20A synchronous step-down Power Module for point-of load supplies. A wide 4.5V to 22V input voltage range allows for single supply operation from industry standard 5V, 12V, and 19.6V rails. With a proprietary emulated current mode Constant On-Time (COT) control scheme, the XR79120 provides extremely fast line and load transient response using ceramic output capacitors. It requires no loop pensation hence simplifying circuit implementation and reducing overall ponent count. The control loop also provides 0.12% load and 0.17% line regulation and maintains constant operating frequency. A selectable power saving mode allows the user to operate in discontinuous mode (DCM) at light current loads thereby significantly increasing the converter efficiency. With a 93% peak efficiency and 84% for loads as low as 100m A, the XR79120 is suitable for applications where low power losses are important. A host of protection Features , including over-current, over-temperature, short-circuit and UVLO, help achieve safe operation under abnormal operating conditions. The XR79120 is available in a Ro HS pliant, green/halogen free space-saving 74-pin 12x14x4mm QFN package. With integrated controller, drivers, bootstrap diode and capacitor, MOSFETs, inductor, CIN and COUT, this solution allows the smallest possible 20A POL design. Features - Controller, drivers, bootstrap diode and capacitor, MOSFETs, Inductor, CIN and COUT integrated in one package - 20A Step Down Module  Wide 4.5V to 22V Input Voltage Range  >0.6V Adjustable Output Voltage - Proprietary Constant On-Time Control  No Loop pensation Required  Stable Ceramic Output Capacitor Operation  Programmable 200ns to 2μs On-Time  Constant 400k Hz to 600k Hz Frequency - Selectable CCM or CCM/DCM  CCM/DCM for high efficiency at light-load  CCM for constant frequency at light-load - Programmable Hiccup Current Limit with...