LTC1753 Datasheet | Linear Technology

LTC1753 5-Bit Programmable Synchronous Switching Regulator Controller for Pentium® III Processor Features s s s s s s s s s DESCRIPTIO s s s 5-Bit Digitally Programmable 1.3V to 3.5V Fixed Output Voltage, VRM 8.4 pliant Fast Transient Response: 0% to 100% Duty Cycle Phase Lead pensation for Remote Sensing Overtemperature Protection Flags for Power Good 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 Available in 2O-Lead SSOP and SW Packages U APPLICATIO S s s Power Supply for Pentium® III, AMD-K6®-2, SPARC, ALPHA and PA-RISC Microprocessors High Power 5V to 1.3V-3.5V Regulators The LTC®1753 is a high power, high efficiency switching regulator controller optimized for 5V input to a digitally programmable 1.3V-3.5V output. The internal 5-bit DAC programs the output voltage from 1.3V to 2.05V in 50m V increments and from 2.1V to 3.5V in 100m V increments. The precision internal reference and an internal feedback system provide an output accuracy of ± 1.5% at room temperature and typically ± 2% over temperature, load current and line voltage shifts. The LTC1753 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 Nchannel FET, providing an adjustable current limit without an external low value sense resistor. The LTC1753 free-runs at 300k Hz and can be synchronized to a faster external clock if desired. It provides a phase lead pensation scheme and under harsh loading conditions, the PWM duty cycle can be momentarily forced to 0% or 100% to reduce the output voltage recovery time. , LTC...