MaxLinear XR76121ELTR-F

The XR76121 is a synchronous step-down regulator combining the controller, drivers, bootstrap diode and MOSFETs in a single package for point-of-load supplies. The XR76121 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 XR76121 provides extremely fast line and load transient response using ceramic output capacitors. They require no loop compensation, simplifying circuit implementation and reducing overall component 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.

• 20A step-down regulator
• 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 compensation required
• Ceramic output capacitor stable operation
• Programmable 70ns - 1µs on-time
• Constant 200kHz - 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
• RoHS compliant, green/halogen-free space-saving 5mm x 6mm QFN package

• Servers
• Distributed power architecture
• Point-of-load converters
• FPGA, DSP and processor supplies
• Base stations, switches/routers