GENERAL DESCRIPTION

The ADP3170 is a highly efficient output synchronous buck switching regulator controller optimized for converting a 5 V main supply into the core supply voltage required by next generation Intel Celeron processors. The ADP3170 uses an internal 5-bit DAC to read a voltage identification (VID) code directly from the processor, which is used to set the output voltage between 1.05 V and 1.825 V. The ADP3170 uses 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 8.5 Specifications with Lowest

System Cost

5-Bit Digitally Programmable 1.05 V to 1.825 V Output

N-Channel Synchronous Buck Controller

Onboard 1.8 V Linear Regulator Controller

Total Accuracy ±1 Over Temperature

High Efficiency Current-Mode Operation

Short Circuit Protection

Power Good Output

Overvoltage Protection Crowbar Protects

Microprocessors with No Additional External

Components

APPLICATIONS

Core and 1.8 V Standby Supplies for Next Generation

Intel Pentium® III Processors