SC450 Datasheet | SEMTECH

ription The SC450 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 SC450 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 SC450 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 IMVP4+™ pliant single chip solution On chip CLK_ENABLE# and IMVP4_PWRGD outputs Backward patible with SC1476 High speed hysteretic controller 6 bit VID programmable output Integrated drivers with soft high side turn-on Programmable softstart Programmable boot voltage Programmable Deeper Sleep voltage Dynamic phase current matching Under-voltage lockout on Vcc A Over-voltage protection on CORE Current Limit protection on CORE Thermal protection Powergood flag with blanking during VID or Deeper Sleep mode changes Automatic powersave at light load Slew rate limited DAC TSSOP-38 package ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ A 6-bit DAC, accurate to 0.85%, sets the output voltage ‹ reference, and implements the 0.700V to 1.708V range required by the processor. The hysteretic converter uses a parator without an error amplifier, and therefore provides the fastest possible transient response, while avoiding the stability issues inherent to classical PWM controllers. The DAC is externally slew rate limited to minimize transient currents and audible noise. soft-start, an open-drain PWRGD signal with power-good blanking, and an enable...