GENERAL DESCRIPTION

The ADP3421 is a hysteretic dc-dc buck converter controller with two auxiliary linear regulator controllers. The ADP3421 provides a total power conversion control solution for a microprocessor by delivering the core, I/O, and clock voltages. The optimized low-voltage design is powered from the 3.3 V system supply and draws only 10 µA maximum in shutdown. The main output voltage is set by a 5-bit VID code. To accommodate the transition time required by the newest processors for on-thefly VID changes, the ADP3421 features high-speed operation to allow a minimized inductor size that results in the fastest change of current to the output.

FEATURES

Meets Intel® Mobile Voltage Positioning Requirements

Lowest Processor Dissipation for Longest Battery Life

Best Transient Containment

Minimum Number of Output Capacitors

System Power Management Compliant

Fast, Smooth Output Transition During VID Code

Change

Programmable Current Limit

Power Good

Integrated LDO Controllers for Clock and I/O Supplies

Programmable UVLO

Soft Start with Restart Lock-In

APPLICATIONS

Geyserville-Enabled Core DC-DC Converters

Fixed Voltage Mobile CPU Core DC-DC Converters

Notebook/Laptop Power Supplies

Programmable Output Power Supplies