XR76117 Datasheet | Exar

Power Blox TM 15A Synchronous Step-Down COT Regulator Description The XR76117 is a synchronous step-down regulator bining the controller, drivers, bootstrap diode and MOSFETs in a single package for point-of-load supplies. The XR76117 has a load current rating of 15A. 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 XR76117 provides extremely fast line and load transient response using ceramic output capacitors. It require sno 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 XR76117 is available in a Ro HS pliant, green/halogen-free space-saving 5mm x 6mm QFN package. Typical Application ENABLE VIN POWER GOOD CIN R CBST EN BST VIN SW RLIM PVIN ILIM PGOOD VCC SS FCCM CVCC CSS TON RON AGND VSNS PGND L1 CFF RFF VOUT R1 R2 VOUT R1 COUT R2 Figure 1. Typical Application Efficiency (%) Features - - 15A 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...