LTC1553CSW

Product Summary

The LTC1553CSW is a Programmable Synchronous Switching Regulator Controller. The LTC1553CSW is a high power, high efficiency switching regulator controller optimized for 5V or 12V 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 LTC1553CSW 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 applications of the LTC1553CSW include Power Supply for Pentium II, SPARC, ALPHA and PA-RISC Microprocessors.

Parametrics

LTC1553CSW absolute maximum ratings: (1)Supply Voltage VCC: 9V; (2)PVCC: 20V; (3)Input Voltage IFB (Note 2): PVCC + 0.3V; (4)IMAX: –0.3V to 13V; (5)All Other Inputs: – 0.3V to VCC + 0.3V; (6)Digital Output Voltage: –0.3V to 13V; (7)IFB Input Current (Notes 2, 3): –100mA; (8)Operating Temperature Range: 0℃ to 70℃; (9)Storage Temperature Range: –65℃ to 150℃; (10)Lead Temperature (Soldering, 10 sec.): 300℃.

Features

LTC1553CSW features: (1)5-Bit Digitally Programmable 1.8V to 3.5V Fixed Output Voltage; (2)Provides All Features Required by the Intel PentiumII Processor VRM 8.2 DC/DC Converter Specification; (3)Flags for Power Good, Over-Temperature and Overvoltage Fault; (4)19A Output Current Capability from a 5V or 12V Supply; (5)Dual N-Channel MOSFET Synchronous Driver; (6)Initial Output Accuracy: ±1.5%; (7)Excellent Output Accuracy: ±2% Typ Over Line, Load and Temperature Variations; (8)High Efficiency: Over 95% Possible; (9)Adjustable Current Limit Without External Sense Resistors; (10)Fast Transient Response; (11)Available in 20-Lead SSOP and SW Packages.

Diagrams