资 源 简 介
The ADP3050 is a current mode monolithic buck （step down） PWM switching regulator that contains a high current 1 A power switch and all control， logic， and protecTIon funcTIons. It uses a unique compensaTIon scheme allowing the use of any type of output capacitor （tantalum， ceramic， electrolyTIc， OS-CON）。 Unlike some buck regulators， the design is not restricted to using a specific type of output capacitor or ESR value. A special boosted drive stage is used to saturate the NPN power switch， providing a system efficiency higher than conventional bipolar buck switchers. Further efficiency improvements are obtained by using the low voltage regulated output to provide the internal operating current of the device. A high switching frequency allows the use of small external surface-mount components. A wide variety of standard off-the-shelf devices can be used， providing a great deal of design flexibility. A complete regulator design requires only a few external components. The ADP3050 includes a shutdown input that places the device in a low power mode， reducing the total supply current to under 20 µA. Internal protection features include thermal shutdown circuitry and a cycle-by-cycle current limit for the power switch to provide complete device protection under fault conditions. The ADP3050 provides excellent line and load regulation， maintaining typically less than ±3% output voltage accuracy over temperature and under all input voltage and output current conditions. The ADP3050 is specified over the industrial temperature range of −40°C to +85°C and is available in a thermally enhanced 8-lead （not Pb-free only） SOIC package and a standard 8-lead （Pb-free only） RoHS-compliant SOIC package.
