Analog Devices ADP3050

Description

The ADP3050 is a current-mode monolithic buck (step-down) PWM switching regulator that contains a high current 1A switch and all control, logic and protection functions. It uses a unique compensation scheme which 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 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.

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
• Configurable as a buck, buck-boost, and SEPIC regulator
• Available in 8-lead SOIC package
• Supported by ADIsimPower™ design tool

Typical applications

• Preregulator for linear regulators
• Automotive systems
• Battery chargers
• Industrial power systems
• PC peripheral power systems
• Distributed power systems

More information

• Datasheet
• IC product information