XR76120 Datasheet | Exar

XR76116/20 Power Blox TM 15A and 20A Synchronous Step-Down COT Regulators Description The XR76116 and XR76120 are synchronous step-down regulators bining the controller, drivers, bootstrap diode and MOSFETs in a single package for point-of-load supplies. The XR76116 has a load current rating of 15A and the XR76120 has a load current rating of 20A. A wide 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 XR76116/20 provide extremely fast line and load transient response using ceramic output capacitors. They require no loop pensation, simplifying circuit implementation and reducing overall ponent count. The control loop also provides 0.1% load and 0.1% 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. A host of protection Features , including overcurrent, over temperature, overvoltage, short-circuit, open feedback detect and UVLO, helps achieve safe operation under abnormal operating conditions. The XR76116/20 are available in a Ro HS-pliant, green/halogenfree space-saving 5mm x 6mm QFN package. Features - 15A and 20A step-down regulators - 4.5V to 5.5V low VIN operation - 5V to 22V wide single input voltage - 3V to 22V operation with external 5V bias - ≥0.6V adjustable output voltage - Proprietary constant on-time control - No loop pensation required - Ceramic output capacitor stable operation - Programmable 70ns-1μs on-time - Constant 200k Hz-1MHz frequency - Selectable CCM or CCM/DCM operation - Power-good flag with low impedance when power removed - Precision enable - Programmable soft-start - 5mm x 6mm QFN package APPLICATIONS - Servers - Distributed power architecture - Point-of-load converters - FPGA, DSP and processor...