XR76108 Datasheet | Exar

XR76108 and XR76112 Power Blox™ 8A and 12A Synchronous Step Down COT Regulator General Description The XR76108 and XR76112 are synchronous step-down regulators bining the controller, drivers, bootstrap diode and MOSFETs in a single package for point-of-load supplies. The XR76108 has a load current rating of 8A and the XR76112 has a load current rating of 12A. 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 XR76108 and XR76112 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 0.25% 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 over-current, over-temperature, short-circuit and UVLO, help achieve safe operation under abnormal operating conditions. The XR76108/12 are available in a Ro HS-pliant, green/halogen-free space-saving QFN 5x5mm package. Typical Application Enable/Mode Power Good CIN R3 VIN PVIN EN/MODE PGOOD VCC XR76108 XR76112 SS ILIM CVCC TON RON AGND FB PGND CBST RLIM L1 VOUT CFF R1 R2 COUT Figure 1: XR76108/12 Application Diagram VOUT (V) Features - 8A and 12A Capable Step Down Regulators - 4.5V to 5.5V Low VIN Operation - 4.5V to 22V Wide Single Input...