LTC1553 5-Bit Programmable Synchronous Switching Regulator Controller for Pentium® II Processor
FEATURES
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DESCRIPTI...
LTC1553 5-Bit Programmable Synchronous Switching
Regulator Controller for Pentium® II Processor
FEATURES
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DESCRIPTION
The LTC®1553 is a high power, high efficiency switching
regulator controller optimized for 5V or 12V input to 1.8V3.5V output applications. It features a digitally programmable output voltage, a precision internal reference and an internal feedback system that provides output accuracy of ± 1.5% at room temperature and typically ± 2% over-temperature, load current and line voltage shifts. The LTC1553 uses a synchronous switching architecture with two external N-channel output devices, providing high efficiency and eliminating the need for a high power, high cost P-channel device. Additionally, it senses the output current across the on-resistance of the upper N-channel FET, providing an adjustable current limit without an external low value sense resistor. The LTC1553 free-runs at 300kHz and can be synchronized to a faster external clock if desired. It includes all the inputs and outputs required to implement a power supply conforming to the Intel Pentium® II Processor VRM 8.2 DC/DC Converter Specification.
, LTC and LT are registered trademarks of Linear Technology Corporation. Pentium is a registered trademark of Intel Corporation.
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5-Bit Digitally Programmable 1.8V to 3.5V Fixed Output Voltage Provides All Features Required by the Intel Pentium® II Processor VRM 8.2 DC/DC Converter Specification Flags for Power Good, Over-Temperatu...