GENERAL DESCRIPTION

The ADP3158 and ADP3178 are highly efficient synchronous buck switching regulator controllers optimized for converting a 5 V main supply into the core supply voltage required by high performance processors. These devices use an internal 4-bit DAC to read a voltage identification (VID) code directly from the processor, which is used to set the output voltage between 1.3 V and 2.05 V. They use a current mode, constant off-time architecture to drive two N-channel MOSFETs at a programmable switching frequency that can be optimized for regulator size and efficiency.

FEATURES

Optimally Compensated Active Voltage Positioning with Gain and Offset Adjustment (ADOPT?) for Superior Load Transient Response

Complies with VRM Specifications with Lowest System Cost

4-Bit Digitally Programmable 1.3 V to 2.05 V Output

N-Channel Synchronous Buck Driver

Total Accuracy ±0.8 Over Temperature

Two On-Board Linear Regulator Controllers Designed to Meet System Power Sequencing Requirements

High Efficiency Current-Mode Operation

Short Circuit Protection for Switching Regulator

Overvoltage Protection Crowbar Protects Microprocessors with No Additional External Components

APPLICATIONS

Core Supply Voltage Generation for:

Intel Pentium? III

Intel Celeron?