GENERAL DESCRIPTION

The ADP3161 is a highly efficient dual output synchronous buck switching regulator controller optimized for converting a 5 V or 12 V main supply into the core supply voltage required by high-performance processors such as Pentium® III. The ADP3161 uses 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. The ADP3161 uses a current mode PWM architecture to drive two logic-level outputs at a programmable switching frequency that can be optimized for VRM size and efficiency. The output signals are 180 degrees out of phase, allowing for the construction of two complementary buck switching stages.

FEATURES

ADOPT™ Optimal Positioning Technology for Superior

Load Transient Response and Fewest Output

Capacitors

Active Current Balancing Between Both Output Phases

VRM 8.4-Compatible Digitally Programmable 1.3 V to

2.05 V Output

Dual Logic-Level PWM Outputs for Interface to External

High-Power Drivers

Total Output Accuracy ±0.8 Over Temperature

Current-Mode Operation

Short Circuit Protection

Power-Good Output

Overvoltage Protection Crowbar Protects

Microprocessors with No Additional

External Components

APPLICATIONS

Desktop PC Power Supplies for:

Intel Pentium® III Processors

VRM Modules