The NCP6151/NCP6151A dual output four plus one

phase buck solution is optimized for Intel VR12

compatible CPUs. The controller combines true

differential voltage sensing, differential inductor DCR

current sensing, input voltage feed-forward, and

adaptive voltage positioning to provide accurately

regulated power for both Desktop and Notebook

applications. The control system is based on Dual-Edge

pulse-width modulation (PWM) combined with DCR

current sensing providing the fastest initial response to

dynamic load events and reduced system cost. It also

sheds to single phase during light load operation and

can auto frequency scale in light load while maintaining

excellent transient performance.

Dual high performance operational error amplifiers are

provided to simplify compensation of the system.

Patented Dynamic Reference Injection further simplifies

loop compensation by eliminating the need to

compromise between closed-loop transient response

and Dynamic VID performance. Patented Total Current

Summing provides highly accurate current monitoring for

droop and digital current monitoring.

NCP6151A support coupled inductor operation. It

operates with 2 phases versus NCP6151 operating with

single phase during PS1 mode.

Features

? Meets Intel VR12/IMVP7 Specifications

? Current Mode Dual Edge Modulation for Fastest

Initial Response to Transient Loading

? Dual High Performance Operational Error Amplifier

? One Digital Soft Start Ramp for Both Rails

? Dynamic Reference Injection? (Patent

#US07057381)

? Accurate Total Summing Current Amplifier(Patent

#US006683441)

? DAC with Droop Feed-forward Injection(Patent

Pending)

? Dual High Impedance Differential Voltage and Total

Current Sense Amplifiers

? Phase-to-Phase Dynamic Current Balancing

? “Lossless” DCR Current Sensing for Current

Balancing

? Summed Thermally Compensated Inductor Current

Sensing for Droop

? True Differential Current Balancing Sense Amplifiers

for Each Phase

? Adaptive Voltage Positioning (AVP)

? Switching Frequency Range of 200KHz –

1.0MHz

? Startup into Pre-Charged Loads While

Avoiding False OVP

? Power Saving Phase Shedding

? Vin Feed Forward Ramp Slope

? Pin Programming for Internal SVID

parameters

? Over Voltage Protection (OVP) & Under

Voltage Protection (UVP)

? Over Current Protection (OCP)

? Dual Power Good Output with Internal Delays

? NCP6151A support coupled inductor operation

Applications

? Desktop & Notebook Processors