GENERAL DESCRIPTION

The ADP3422 is a hysteretic dc-dc buck converter controller to power a mobile processor’s core. The optimized low voltage design is powered from the 3.3 V system supply. The 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 ADP3422 features high-speed operation to allow a minimized inductor size that results in the fastest change of current to the output. To further allow for the minimum number of output capacitors to be used, the ADP3422 features active voltage positioning that can be optimally compensated to ensure a superior load transient response. The output signal interfaces with the ADP3415 MOSFET driver that is optimized for high speed and high efficiency for driving both the upper and lower (synchronous) MOSFETs of the buck converter.

FEATURES

Certified IMVP-II Controller

Excellent Transient Containment

Minimum Number of Output Capacitors

Fast, Smooth, Output Transition During VID Code Change

Current Limit with Hiccup Protection

Transient-Glitch-Free Power Good

Low Shutdown Current

Soft Start Eliminates In-Rush Current Surge

Adaptive Noise-Blanking Enhancement for Speed and

Stability

Highly Redundant Over-Voltage and Reverse-Voltage

Protection

Controls Synchronous Rectifier for Improved Battery Life

APPLICATIONS

IMVP-II Enabled Core DC/DC Converters

Fixed-Voltage Mobile CPU Core DC/DC Converters

Notebook/Laptop Power Supplies

Programmable Output Power Supplies