LTC1553 Series

5-Bit Programmable Synchronous Switching Regulator Controller for Pentium®II Processor

Catalog

5-Bit Programmable Synchronous Switching Regulator Controller for Pentium®II Processor

Part	Package / Case	Package / Case [y]	Package / Case [y]	Number of Outputs	Voltage - Input	Supplier Device Package	Mounting Type	Applications	Voltage - Output [Min]	Voltage - Output [Max]	Operating Temperature [Max]	Operating Temperature [Min]
Analog Devices LTC1553CSW#PBF	20-SOIC	0.295 in	7.5 mm	1	5 VDC 12 VDC	20-SO	Surface Mount	Controller Intel Pentium® II	1.8 V	3.5 V	70 °C	0 °C
Analog Devices LTC1553CG#TRPBF	20-SSOP			1	5 VDC 12 VDC	20-SSOP	Surface Mount	Controller Intel Pentium® II	1.8 V	3.5 V	70 °C	0 °C

Catalog

5-Bit Programmable Synchronous Switching Regulator Controller for Pentium®II Processor

Key Features

• 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 or 12V 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 20-Lead SSOP and SW Packages

Description

The LTC1553 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 LTC1553 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 LTC1553 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.ApplicationsPower Supply for Pentium II, SPARC, ALPHA and PA-RISC MicroprocessorsHigh Power 5V or 12V to 1.8V-3.5V Regulators