NCP5381A Series

2/3/4-Phase Buck Controller for VR10 and VR11 Pentium IV Processor Applications

Catalog

2/3/4-Phase Buck Controller for VR10 and VR11 Pentium IV Processor Applications

Part	Supplier Device Package	Voltage - Input [Min]	Voltage - Input [Max]	Mounting Type	Number of Outputs	Operating Temperature [Max]	Operating Temperature [Min]	Package / Case	Applications
ON Semiconductor NCP5381AMNR2G	40-QFN (7x7)	10.8 V	13.2 V	Surface Mount	4	70 °C	0 °C	40-VFQFN Exposed Pad	Controller Intel Pentium® IV

Catalog

2/3/4-Phase Buck Controller for VR10 and VR11 Pentium IV Processor Applications

Key Features

• Dual-Edge PWM for Fastest Initial Response to Transient Loading

• High Performance Operational Error Amplifier

• Supports both VR11 and Legacy VR10 Soft-Start Modes

• Dynamic Reference Injection (Patent Pending)

• DAC Range from 0.5V to 1.6V

• +/- 0.5% System Voltage Accuracy

• Remote Temperature Sensing per VR11

• 2,3, or 4-Phase Operation

• True Differential Remote Voltage Sensing Amplifier

• Phase-to-Phase Current Balancing

• Lossless Differential Inductor Current Sensing

• Differential Current Sense Amplifiers for each Phase

• Adaptive Voltage Positioning

• Fixed No-Load Voltage Positioning at -15mV

• Frequency Range: 100kHz-1.0MHz

• Latched Overvoltage Protection (OVP)

• Threshold Sensitive Enable Pin for VTT Sensing

• Power Good Output with Internal Delays

• Programmable Soft-Start Time

• Operates from 12V

• Low Voltage, High Current Power Supplies

Description

NCP5388 is a two-three or four phase buck controller which combines differential voltage and current sensing, and adaptive voltage positioning to power Intel's most demanding Pentium IV ® processors and low voltage, high current power supplies. Dual edge pulse width modulation (PWM) combined with inductor current sensing reduces system cost by providing the fastest initial response to transient loads thereby requiring less bulk and ceramic output capacitors to satisfy transient load-line requirements. A high performance operational error amlifer is provided, which allows easy compensation of the system. The proprietary method of Dynamic Reference Injection (patented) makes the error amplifer compensation virtually independent of hte sytem response to VID changes, eliminating the need for tradoffs between load transients and Dynamic VID performance.