XR76203 Datasheet | Exar

XR76203/5/8 40V Power Blox TM 3A/5A/8A Synchronous Step Down COT Regulator General Description The XR76203, XR76205 and XR76208 are synchronous step-down regulators bining the controller, drivers, bootstrap diode and MOSFETs in a single package for point-of-load supplies. The XR76203, XR76205 and XR76208 have load current ratings of 3A, 5A and 8A respectively. A wide 5V to 40V input voltage range allows for single supply operation from industry standard 24V ±10%, 18V-36V, and rectified 18VAC and 24VAC rails. With a proprietary emulated current mode Constant On-Time (COT) control scheme, the XR76203, XR76205 and XR76208 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 0.07% load and 0.15% line regulation and maintains constant operating frequency. A selectable power saving mode allows the user to operate in discontinuous conduction mode (DCM) at light current loads thereby significantly increasing the converter efficiency. A host of protection Features , including over-current, over-temperature, short-circuit and UVLO, helps achieve safe operation under abnormal operating conditions. The XR76203/5/8 are available in a Ro HS-pliant, green/halogen-free space-saving QFN 5x5mm package. Features - Controller, drivers, bootstrap diode and MOSFETs integrated in one package - 3A, 5A and 8A Step Down Regulators  Wide 5V to 40V 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 100k Hz to 800k 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 Thermal pensation - Precision Enable and Power Good flag - Programmable...