GENERAL DESCRIPTION
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 that allows 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 devices internal operating current. 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 SOIC package.

FEATURES
  Wide Input Voltage Range: 3.6 V to 30 V
  Adjustable and Fixed (3.3 V, 5 V) Output Options
  Integrated 1 A Power Switch
  Uses Small Surface-Mount Components
  Cycle-By-Cycle Current Limiting
  Peak Input Voltage (100 ms): 60 V
  Thermally Enhanced 8-Lead SOIC Package
  Configurable as a Buck, Buck-Boost and SEPIC Regulator

APPLICATIONS
  Industrial Power Systems
  PC Peripheral Power Systems
  Preregulator for Linear Regulators
  Distributed Power Systems
  Automotive Systems
  Battery Chargers