LTC1553 Datasheet | Linear Technology

LTC1553 5-Bit Programmable Synchronous Switching Regulator Controller for Pentium® II Processor Features s s 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 300k Hz 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. s s s s s s s s s 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-Temperature and Overvoltage Fault 19A Output Current Capability from a 5V or 12V Supply Dual N-Channel MOSFET Synchronous Driver Initial Output Accuracy: ± 1.5% Excellent Output Accuracy: ±2% Typ Over Line, Load and Temperature Variations High Efficiency: Over 95% Possible Adjustable Current Limit Without External Sense Resistors Fast Transient Response Available in 20-Lead SSOP and SW Packages U APPLICATIONS s s Power Supply for Pentium II, SPARC, ALPHA and PA-RISC Microprocessors High Power 5V or...