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The LTC®1552 is a high power, high efficiency switching regulator controller optimized for 5V or 12V input to 2.1V - 3.5V output applications. It features digitally programmable output voltage, a precision internal reference and an internal feedback system that can provide output regulation of ±1% over temperature, load current and line voltage shifts. The LTC1552 uses a synchronous switching architecture with two external N-channel output devices, 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 LTC1552 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 Pro Processor VRM 8.0 DC/DC Converter Specification.
LTC1552 Maximum Ratings
Supply Voltage VCC ........................................................................ 7V PVCC ...................................................................... 20V Input Voltage IFB ......................................................................... – 0.3V to PVCC + 0.3V IMAX ......................................................................–0.3V to 13V All Other Inputs .................................................... –0.3V to VCC + 0.3V Digital Output Voltage ..............................................–0.3V to 13V Operating Temperature Range ................................. 0°C to 70°C Storage Temperature Range .................................... –65°C to 150°C Lead Temperature (Soldering, 10 sec) ..................... 300°C
LTC1552 Features
■Digitally Programmable 2.1V to 3.5V Fixed Output Voltage with 100mV Steps ■Provides All Features Required by the Intel Pentium® Pro Processor VRM 8.0 DC/DC Converter Specification ■Flags for Power Good, Over Temperature and Over Voltage Fault ■Output Current Exceeds 14A from a 5V or 12V Supply ■Dual N-Channel MOSFET Synchronous Drive ■Excellent Output Regulation: ±1% Over Line, Load and Temperature Variations ■High Efficiency: Over 95% Possible ■Adjustable Current Limit Without External Sense Resistors ■Fast Transient Response ■Available in SSOP-20 Package
LTC1552 Typical Application
■Power Supply for Pentium Pro, SPARC, ALPHA and PA-RISC Microprocessors ■High Power 5V or 12V/2.1V - 3.5V Regulators