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SC453 Datasheet(PDF) 1 Page - Semtech Corporation |
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SC453 Datasheet(HTML) 1 Page - Semtech Corporation |
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1 / 23 page  www.semtech.com 1 POWER MANAGEMENT Portable, VID Programmed Single Phase Power Supply Controller SC453 High Speed Hysteretic Controller Single Phase Operation Selectable Analog or VID Controlled Sleep Setting 6 Bit VID programmable Output Integrated Drivers with Soft-High Side Turn-On Programmable Soft-Start Programmable Boot Voltage Programmable Sleep Voltage with Sleep Mode Under-Voltage Lockout on VCCA Over-voltage Protection on CORE Current Limit Protection on CORE Thermal Protection Power Good Flag with Blanking During V CORE Changes Automatic Power Save at Light Load TSSOP-28 Package August 25, 2006 Description Features The SC453 IC is a single chip high-performance Hysteretic PWM controller. With its integrated SmartDriver™, it pow- ers advanced graphics and core processors. It provides 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. 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 comparator without an error amplifier, and therefore pro- vides the fastest possible transient response, while avoid- ing the stability issues inherent to classical PWM control- lers. The DAC is externally slew rate limited to minimize transient currents and audible noise. The SC453 operates from 5VDC and also features soft- start, an open-drain PWRGD signal with power good blank- ing, and an enable input. Programmable current limiting shuts down the SC453 after 32 current limit pulses. Low Power Notebook and Laptop Computers Embedded Applications Typical Application Circuit Applications Features PowerStep IV™ and Smart Driver™ are trademarks of Semtech Corporation. SC453 Single Phase Power Supply Smart Driver PWM Controller VID Logic and DAC VID (5:0) VIN V 5 V CCA VCORE 0.700V-1.708V |
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