GENERAL DESCRIPTION

The ADP3203 is a 1- or 2-phase hysteretic peak current dc-to-dc buck converter controller dedicated to power a mobile processor’s core. The optimized low voltage design is powered from the 3.3 V system supply and draws only 10 µA maximum in shutdown. The nominal output voltage is set by a 5-bit VID code. To accommodate the transition time required by the newest processors for on-the-fly VID changes, the ADP3203 features high speed operation to allow a minimized inductor size that results in the fastest change of current to the output.

FEATURES

Pin Selectable 1- or 2-Phase Operation

Static and Dynamic Current Sharing Characteristics

Backward Compatible to IMVP-II

Superior Load Transient Response with ADOPTTM Optimal Positioning Technology

Noise Blanking for Speed and Stability

Synchronous Rectifier Control Extends Battery Life

Smooth Output Transition During VID Code Change

Cycle-by-Cycle Current Limiting

Hiccup or Latched Overload Protection

Transient Glitch-Free Power Good

Soft Start Eliminates Power-On In-Rush Current Surge

2-Level Overvoltage and Reverse Voltage Protection

APPLICATIONS

IMVP-II and IMVP-III Core DC-to-DC Converters

Fixed Voltage Mobile CPU Core DC-to-DC Converters

Notebook/Laptop Power Supplies

Programmable Output Power Supplies