The LTC4219 is suitable for a wide range of RAID, server, telecom and industrial applications, especially in compact boards utilizing technologies like Fibre Channel where power is typically limited to less than 25W due to their small size and inability to dissipate large amounts of heat. The LTC4219 was designed with these considerations in mind. During
start-up, inrush currents are controlled by limiting the gate ramp rate to a safe 0.3V/ms. Load current is monitored using the voltage sensed across the internal 7.5mOhm sense resistor and adjusting the internal 33mOhm MOSFET gate-to-source voltage accordingly. A separate ISET pin enables adjustment of the 10% accurate (5A) current limit threshold during start-up and normal operation as needed. In addition, current foldback and power-good circuitry ensure that the switch is protected from excessive load current and indicate whether or not healthy power conditions are maintained. The LTC4219 also features current, temperature and fault outputs, as well as an adjustable current limit timer.The LTC4219 is available as a dedicated 12V (LTC4219-12) or 5V (LTC4219-5) version, which contain preset 12V/5V-specific thresholds. Both devices are offered in commercial and industrial operating temperature grades. The LTC4219 is available in a small, RoHS-compliant, 16-pin 5mm x 3mm DFN package and priced starting at $3.35 each in 1,000 piece quantities.
SOURCE: Linear Technology