NCP6121
Preliminary Datasheet
Dual Output 3 Phase +1/0 Phase
Controller with single SVID Interface
for Desktop CPU Applications
http://onsemi.com
The NCP6121 dual output three 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 Desktop 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.
Features
x Meets Intel VR12 Specifications
x Current Mode Dual Edge Modulation for Fastest
Initial Response to Transient Loading
x Dual High Performance Operational Error Amplifier Device Package Shipping
x One Digital Soft Start Ramp for Both Rails QFN52 2500/Tape &
NCP6121S52MNR2G
Single Row Reel
x Dynamic Reference Injection® (Patent
#US07057381) Pb-free and Halide-free packages are
available
x Accurate Total Summing Current Amplifier(Patent
#US006683441)
x Startup into Pre-Charged Loads While Avoiding
x DAC with Droop Feed-forward Injection(Patent
False OVP
Pending)
x Power Saving Phase Shedding
x Dual High Impedance Differential Voltage and Total
Current Sense Amplifiers x Vin Feed Forward Ramp Slope
x Phase-to-Phase Dynamic Current Balancing x Pin Programming for Internal SVID
parameters
x “Lossless” DCR Current Sensing for Current
Balancing x Over Voltage Protection (OVP) & Under
Voltage Protection (UVP)
x Summed Thermally Compensated Inductor Current
Sensing for Droop x Over Current Protection (OCP)
x True Differential Current Balancing Sense Amplifiers x Dual Power Good Output with Internal Delays
for Each Phase
Applications
x Adaptive Voltage Positioning (AVP)
x Desktop Processors
x Switching Frequency Range of 100KHz –
1.0MHz
x Input voltage range from 5V to 13.2V
ON Semiconductor Confidential 1
Confidential and Proprietary – Not for Public Release
Rev 1 – July, 2010
This datasheet has been downloaded from http://www.digchip.com at this page
