GENERAL DESCRIPTION

The ADP3164 is a highly efficient 4-phase synchronous buck switching regulator controller optimized for converting a 12 V main supply into the core supply voltage required by high performance Intel processors. The ADP3164 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 1.1 V and 1.85 V. The ADP3164 uses a current mode PWM architecture to drive the logic-level outputs at a programmable switching frequency that can be optimized for VRM size and efficiency. The four output phases share the dc output current to reduce overall output voltage ripple. An active current balancing function ensures that all phases carry equal portions of the total load current, even under large transient loads, to minimize the size of the inductors.

FEATURES

ADOPT? Optimal Positioning Technology for Superior Load Transient Response and Fewest Output Capacitors

Complies with VRM 9.1 with Lowest System Cost

4-Phase Operation at up to 500 kHz per Phase

Quad Logic-Level PWM Outputs for Interface to External High-Power Drivers

Active Current Balancing between All Output Phases

Accurate Multiple VRM Module Current Sharing

5-Bit Digitally Programmable 1.1 V to 1.85 V Output

Total Output Accuracy
0.8 Over Temperature

Current-Mode Operation

Short Circuit Protection

Enhanced Power Good Output Detects Open Outputs in Multi-VRM Power Systems

Overvoltage Protection Crowbar Protects Microprocessors with No Additional External Components

APPLICATIONS

Desktop PC Power Supplies for: Intel Pentium? 4 Processors VRM Modules