SC451 Datasheet | SEMTECH

.. Portable IMVP-IV™ and IMVP-IV+™ Single Phase Power Supply Controller POWER MANAGEMENT Description The SC451 Power Step IV™ IC is a single chip high-performance Hysteretic PWM controller. With its integrated Smart Driver™, it powers advanced IMVP-IV™ and IMVP4+™ processors. The SC451 Features extended Intel Mobile Voltage Positioning (IMVP™) to increase battery life by reducing the voltage at the processor when it is heavily loaded. It directly supports Intel’s Speed Step® processors for even longer battery life. The SC451 fully supports the Intel® Geyserville-III core voltage specification. It provides direct “deeper sleep” mode and boot voltage support. Automatic “power-save” is present to prevent negative current flow in the low-side FET during light loading conditions, saving even more power. The high side driver initially turns on with a weak drive to reduce ringing, EMI, and capacitive turn-on of the low side. Features ‹ IMVP-IV™ and IMVP-IV+™ pliant single chip ‹ ‹ ‹ ‹ ‹ solution On chip CLK_ENABLE# and IMVP4_PWRGD outputs Backward patible with SC1479 High speed hysteretic controller Single phase operation Selectable analog or VID controlled Deeper Sleep setting ‹ 6 bit VID programmable output ‹ Integrated drivers with soft high side turn-on ‹ Programmable softstart ‹ Programmable boot voltage ‹ Programmable Deeper Sleep voltage ‹ Under-voltage lock out on Vcc A ‹ Over-voltage protection on CORE A 6-bit DAC, accurate to 0.85%, sets the output voltage ‹ Current limit protection on CORE reference, and implements the 0.700V to 1.708V range ‹ Thermal protection required by the processor. The hysteretic converter uses a ‹ Powergood flag with blanking during VID or parator without an error amplifier, and therefore proe Deeper Sleep mode changes Data She vides the fastest possible transient response, while avoid‹ Automatic powersave at light load ing the stability issues inherent to classical PWM . controllers. The DAC...