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ADP3170 Datasheet(PDF) 1 Page - Analog Devices |
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ADP3170 Datasheet(HTML) 1 Page - Analog Devices |
1 / 16 page REV. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a ADP3170 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 2001 VRM 8.5 Compatible Single Phase Core Controller FUNCTIONAL BLOCK DIAGRAM OSCILLATOR PWM LOGIC SET RESET CROWBAR 3.0V REFERENCE 1.8V DAC +20% DAC –20% CMP gm REF VID DAC REF VID25 VID0 VID1 VID2 VID3 UVLO AND BIAS SD DRVH VCC GND REF LRFB LRDRV COMP DRVL PGND PWRGD CS– CS+ FB CT ADP3170 FEATURES Optimally Compensated Active Voltage Positioning with Gain and Offset Adjustment (ADOPT™) for Superior Load Transient Response Complies with VRM 8.5 Specifications with Lowest System Cost 5-Bit Digitally Programmable 1.05 V to 1.825 V Output N-Channel Synchronous Buck Controller Onboard 1.8 V Linear Regulator Controller Total Accuracy 1% Over Temperature High Efficiency Current-Mode Operation Short Circuit Protection Power Good Output Overvoltage Protection Crowbar Protects Microprocessors with No Additional External Components APPLICATIONS Core and 1.8 V Standby Supplies for Next Generation Intel Pentium® III Processors GENERAL DESCRIPTION The ADP3170 is a highly efficient output synchronous buck switching regulator controller optimized for converting a 5 V main supply into the core supply voltage required by next generation Intel Celeron processors. The ADP3170 uses an internal 5-bit DAC to read a voltage identification (VID) code directly from the processor, which is used to set the output voltage between 1.05 V and 1.825 V. The ADP3170 uses a current mode, constant off-time architecture to drive two N-channel MOSFETs at a programmable switching frequency that can be optimized for regulator size and efficiency. The ADP3170 also uses a unique supplemental regulation tech- nique called Analog Devices Optimal Positioning Technology (ADOPT) to enhance load transient performance. Active voltage positioning results in a dc/dc converter that meets the stringent output voltage specifications for high performance processors, with the minimum number of output capacitors and smallest footprint. Unlike voltage-mode and standard current- mode architectures, active voltage positioning adjusts the output voltage as a function of the load current so that it is always optimally positioned for a system transient. The ADP3170 also provides accurate and reliable short circuit protection and adjustable current limiting. It also includes an integrated overvoltage crowbar function to protect the microprocessor from destruction in case the core supply exceeds the nominal programmed voltage by more than 20%. The ADP3170 contains a 1.8 V linear regulator controller that is designed to drive an external N-channel MOSFET. This linear regulator can be used to generate auxiliary voltages (such as 1.8 V standby power) required in most motherboard designs, and has been designed to provide a high bandwidth load-transient response. The ADP3170 is specified over the commercial temperature range of 0 °C to 70°C and is available in a 20-lead TSSOP package. ADOPT is a trademark of Analog Devices, Inc. Pentium is a registered trademark of Intel Corporation |
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