ADP2390 Datasheet | Analog Devices

Data Sheet 18 V, 12 A Step-Down Regulator with Programmable Current Limit ADP2389/ADP2390 12192-001 Features Input voltage: 4.5 V to 18 V Continuous output current: 12 A Integrated MOSFETs: 17 mΩ high-side/4.5 mΩ low-side 0.6 V ± 0.5% reference voltage Programmable switching frequency range: 200 k Hz to 2200 k Hz Enhanced transient response Programmable current limit with ±10% accuracy Precision enable and power good External pensation and soft start PFM mode (ADP2390 only) Start up into a precharged output Supported by the ADIsim Power design tool APPLICATIONS munication infrastructure Networking and servers Industrial and instrumentation Healthcare and medical Intermediate power rail conversions DC-to-DC point of load applications TYPICAL APPLICATIONS CIRCUIT VIN CIN RFTW RILIM RT CVREG VIN PVIN EN PGOOD BST SW ADP2389/ ADP2390 FTW ILIM RT VREG SS PGND CBST L VOUT COUT RTOP RBOT RC CSS CC Figure 1. GENERAL DESCRIPTION The ADP2389/ADP2390 are current mode control, synchronous step-down, dc-to-dc regulators. They integrate a 17 mΩ high-side power MOSFET and a 4.5 mΩ synchronous rectifier MOSFET to provide a high efficiency solution. The ADP2390 operates in pulse frequency modulation (PFM) mode to improve the system efficiency at light load. The ADP2389/ADP2390 run from an input voltage of 4.5 V to 18 V and can deliver up to 12 A of output current. The output voltage can be adjusted to 0.6 V and the switching frequency can be programmed between 200 k Hz to 2200 k Hz. The ADP2389/ADP2390 target high performance applications that require high efficiency and design flexibility. External pensation and soft start provide design flexibility. The powergood output and precision enable input provide simple and reliable power sequencing. An enhanced transient response feature improves the load transient performance, which reduces the output capacitance. Programmable current limit allows the user to optimized the inductor design and provide a...