low side MOSFET, while also increasing overall ef鏗乧iency.
switching frequency at light loads. Combined with an
鏗?/div>
ow in the low-side FET, system ef鏗乧iency is sig-
ni鏗乧antly enhanced during light loading conditions. The
SC452 changes from dual-phase to single-phase opera-
tion whenever PSI# asserts, providing optimal ef鏗乧iency
across the entire power range.
A 7-bit DAC, accurate to 0.85%, sets the output voltage
reference, and implements the 0.300V to 1.500V range
required by the processor. The DAC slew rate is externally
programmed to minimize transient currents and audible
noise. True differential remote sensing provides accu-
rate point-of-load regulation at the processor die. Other
features include programmable soft-start, open-drain
IMVP6_PWRGD and CLKEN# outputs, dynamic current
sharing, over-voltage and programmable over-current pro-
tection. The SC452 is available in a space-saving 44 pin
MLP package.
SC452
Features
Dual-Phase Solution with Integrated Drivers
Hysteretic Control for Fast Transient Response
Combi-Sense Provides Loss-Less Current Sensing
Dynamic Current Sharing
Active Voltage Positioning
True Differential Remote (die) Sensing
On-Chip Support for all IMVP-6 Power Management
Features
VID Programmed Deeper Sleep Voltage
Fast/Slow C4E Break-Event Support
Clock Enable (CLKEN#) Output
Delayed Power Good Signal with Blanking
Programmable Soft-Start and DAC Slew Control
Programmable OCP Threshold
Supports all Ceramic Decoupling Solutions
44 pin MLP (7x7)
Lead-free Package
Applications
IMVP-6/6+ Notebook PCs
Embedded Applications
Graphics and Other Processor Cores
February 22, 2006
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