HIP6311A
Microprocessor CORE Voltage Regulator Multiphase Buck PWM Controller

Key Features

• Precision CORE Voltage Regulation
• ±0.5% System Accuracy Over Temperature
• Microprocessor Voltage Identification Input
• 5-Bit VID Input
• 1.100V to 1.850V in 25mV Steps
• Programmable Droop Voltage
• RDS(on) Current Sensing
• Accurate Channel Current Balancing
• Loss less Current Sampling
• Low-Cost Implementation
• Fast Transient Response
• Digital Soft Start
• Over Current Protection
• Selection of 2, 3, or 4 Phase Operation
• 50kHz to 1.5MHz Switching Frequency
• Pb-free available

Description

The HIP6311A Multiphase Buck PWM control IC together with HIP6601A, HIP6602A or HIP6603A companion gate drivers form a precision voltage regulation system for advanced microprocessors. The HIP6311A controls microprocessor core voltage regulation by driving 2 to 4 synchronous-rectified buck channels in parallel. The multiphase buck topology takes advantage of interleaving phases to increase ripple frequency and reduce input and output ripple currents. Resulting in fewer components, reduced component ratings, lower power dissipation, and smaller implementation area.

The HIP6311A control IC features a 5 bit digital-to-analog converter (DAC) that adjusts the core output voltage from 1.100V to 1.850V with an unsurpassed system accuracy of ±0.5% over temperature. The HIP6311A uses a lossless current sensing approach in which the voltage developed across the on-resistance of the lower MOSFETs during conduction is sampled. Current sensing provides the required signals for precision droop, channel-current balancing, load sharing, and over-current protection.

Another feature of this control IC is the PGOOD monitor which is held low until the core voltage increases to within 8% of the programmed voltage. An over-voltage condition is detected when the output voltage exceeds 115% of the programmed VID. This results in the converter shutting down and PGOOD being pulled low. During an under-voltage condition (output voltage 10% below the programmed VID), PGOOD transitions low, but the converter continues to operate.

Applications

• Desktop Motherboards
• Voltage Regulator Modules
• Servers and Workstations