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LTC1553 Datasheet(PDF) 1 Page - Linear Technology |
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LTC1553 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 24 page  1 LTC1553 5-Bit Programmable Synchronous Switching Regulator Controller for Pentium ® II Processor FEATURES DESCRIPTION s 5-Bit Digitally Programmable 1.8V to 3.5V Fixed Output Voltage s Provides All Features Required by the Intel Pentium ® II Processor VRM 8.2 DC/DC Converter Specification s Flags for Power Good, Over-Temperature and Overvoltage Fault s 19A Output Current Capability from a 5V or 12V Supply s Dual N-Channel MOSFET Synchronous Driver s Initial Output Accuracy: ±1.5% s Excellent Output Accuracy: ±2% Typ Over Line, Load and Temperature Variations s High Efficiency: Over 95% Possible s Adjustable Current Limit Without External Sense Resistors s Fast Transient Response s Available in 20-Lead SSOP and SW Packages The LTC ®1553 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 synchro- nous 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. Addition- ally, 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 conform- ing to the Intel Pentium ® II Processor VRM 8.2 DC/DC Converter Specification. APPLICATIONS s Power Supply for Pentium II, SPARC, ALPHA and PA-RISC Microprocessors s High Power 5V or 12V to 1.8V-3.5V Regulators TYPICAL APPLICATION Figure 1. 5V to 1.8V-3.5V Supply Application PWRGD FAULT OT VID0 TO VID4 OUTEN COMP SS SGND GND SENSE 10 µF Q1* 20 Ω Q2* 0.1 µF VCC IMAX PVCC PVCC 12V VIN 5V LO† 2 µH 18A LTC1553 G1 IFB G2 + 0.1 µF 1553 F01 CC 0.01 µF RC 8.2k 5.6k 2.7k 5.6k 5.6k CSS 0.1 µF 0.1 µF 10 µF CIN** 1200 µF × 4 VOUT 1.8V TO 3.5V 14A COUT†† 330 µF × 7 + + C1 150pF + 5 PENTIUM ® II SYSTEM *SILICONIX SUD50N03-10 **SANYO 10MV1200GX †COILTRONICS CTX02-13198 OR PANASONIC 12TS-2R5SP ††AVX TPSE337M006R0100 , LTC and LT are registered trademarks of Linear Technology Corporation. Pentium is a registered trademark of Intel Corporation. |
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