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 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.

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

APPLICATIONS

Industrial power systems

PC peripheral power systems

Preregulator for linear regulators

Distributed power systems

Automotive systems

Battery chargers