LTC1753CSW#TR

Product Summary

The LTC1753CSW#TR is a high power, high efficiency switching regulator controller optimized for 5V input to a digitally programmable 1.3V-3.5V output. 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 LTC1753CSW#TR 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 LTC1753CSW#TR free-runs at 300kHz and can be synchronized to a faster external clock if desired. It provides a phase lead compensation 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. Applications are power supply for pentium III, AMD-K6-2, SPARC, ALPHA and PA-RISC microprocessors, high power 5V to 1.3V-3.5V regulators.

Parametrics

LTC1753CSW#TR absolute maximum ratings: (1)Supply Voltage VCC : 7V, PVCC : 14V; (2)Input Voltage IFB: PVCC + 0.3V, IMAX : – 0.3V to 9V; (3)All Other Inputs : – 0.3V to (VCC + 0.3V); (4)Digital Output Voltage : – 0.3V to 9V; (5)IFB Input Current: –100mA; (6)Junction Temperature : 125℃; (7)Operating Temperature Range : 0℃ to 70℃; (8)Storage Temperature Range : –65℃ to 150℃; (9)Lead Temperature (Soldering, 10 sec.): 300℃.

Features

LTC1753CSW#TR features: (1)5-Bit Digitally Programmable 1.3V to 3.5V Fixed Output Voltage, VRM 8.4 Compliant; (2)Fast Transient Response: 0% to 100% Duty Cycle; (3)Phase Lead Compensatiofor Remote Sensing; (4)Overtemperature Protection; (5)Flags for Power Good and Overvoltage Fault; (6)19A Output Current Capability from a 5V Supply; (7)Dual N-Channel MOSFET Synchronous Driver; (8)Initial Output Accuracy: ±1.5%; (9)Excellent Output Accuracy: ±2% Typ Over Line, Load and Temperature Variations; (10)High Efficiency: Over 95% Possible; (11)Adjustable Current Limit Without External Sense Resistors; (12)Available i2O-Lead SSOP and SW Packages.

Diagrams