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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 / 26 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 SmartDrive™ Programmable Soft-Start Programmable Boot Voltage Programmable Sleep Voltage with Sleep Mode Under-Voltage Lockout on V CCA and V 5 Over-voltage Protection on V CORE Current Limit Protection on V CORE Thermal Protection Power Good Flag with Blanking During V CORE Changes Automatic Power Save at Light Load Package Types — TSSOP-28, MLPQ-32 June 22, 2009 Description Features The SC453 IC is a single chip high-performance Hysteretic PWM controller. With its integrated SmartDrive™ 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 to provide fast transient response while avoiding the stability issues in- herent to classical PWM controllers. The DAC is externally slew rate limited to minimize transient currents and au- dible noise. The SC453 operates from a 5V supply and also features soft-start, an open-drain power good signal with V CORE tran- sition blanking, and an enable input. Programmable cur- rent 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. Smart Driver PWM Controller VID Logic and DAC VID (5:0) VIN V5 VCORE 0.700V – 1.708V VCCA SC453 Single Phase Power Supply + |
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