The LTC1553L is a high power, high efficiency switching regulator controller optimized for a 5V input to 1.8V-3.5V 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 LTC1553L 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 LTC1553L 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. Applications * Power Supply for Pentium II, SPARC, ALPHA and PA-RISC Microprocessors * High Power 5V to 1.8V-3.5V Regulators * 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 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 2O-Lead SSOP and SW Packages https://elecena.pl/product/378691/5-bit-programmable-synchronous-switching-regulator-controller-for-pentium-ii-processor 2007-04-24 https://elecena.pl/product/378691/5-bit-programmable-synchronous-switching-regulator-controller-for-pentium-ii-processor 2014-04-05 https://elecena.pl/product/378691/5-bit-programmable-synchronous-switching-regulator-controller-for-pentium-ii-processor 2025-01-18