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ADP3168JRU-REEL7 Datasheet(PDF) 1 Page - Analog Devices |
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ADP3168JRU-REEL7 Datasheet(HTML) 1 Page - Analog Devices |
1 / 24 page 6-Bit, Programmable 2-, 3-, 4-Phase Synchronous Buck Controller ADP3168 Rev. B 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. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. 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 © 2004 Analog Devices, Inc. All rights reserved. FEATURES Selectable 2-, 3-, or 4-phase operation at up to 1 MHz per phase ±10 mV worst-case differential sensing error over temperature Logic-level PWM outputs for interface to external high power drivers Active current balancing between all output phases Built-in Power Good/crowbar blanking supports On-the-fly VID code changes 6-bit digitally programmable 0.8375 V to 1.6 V output Programmable short-circuit protection with programmable latch-off delay APPLICATIONS Desktop PC power supplies for: Next generation Intel® processors VRM modules GENERAL DESCRIPTION The ADP3168 is a highly efficient, multiphase, synchronous buck switching regulator controller optimized for converting a 12 V main supply into the core supply voltage required by high performance Intel processors. It uses an internal 6-bit DAC to read a voltage identification (VID) code directly from the processor, which is used to set the output voltage between 0.8375 V and 1.6 V, and uses a multimode PWM architecture to drive the logic-level outputs at a programmable switching frequency that can be optimized for VR size and efficiency. The phase relationship of the output signals can be programmed to provide 2-, 3-, or 4-phase operation, allowing for the construc- tion of up to four complementary buck switching stages. The ADP3168 also includes programmable no-load offset and slope functions to adjust the output voltage as a function of the load current so that it is always optimally positioned for a system transient. The ADP3168 also provides accurate and reliable short-circuit protection, adjustable current limiting, and a delayed Power Good output that accommodates on-the-fly output voltage changes requested by the CPU. The device is specified over the commercial temperature range of 0°C to 85°C and is available in a 28-lead TSSOP package. FUNCTIONAL BLOCK DIAGRAM PWM2 FB PWM3 PWM4 SW1 CSSUM CSCOMP SW2 SW3 SW4 CSREF PWM1 ADP3168 VID4 VID3 VID2 VID1 VID5 VID0 FBRTN GND EN DELAY ILIMIT PWRGD COMP VCC RT RAMPADJ CROWBAR CURRENT LIMIT 2-, 3-, 4-PHASE DRIVER LOGIC EN SET RESET RESET RESET RESET OSCILLATOR CMP CMP CMP CMP CURRENT- BALANCING CIRCUIT DELAY UVLO SHUTDOWN AND BIAS DAC +150mV DAC –250mV CSREF PRECISION REFERENCE SOFT- START VID DAC EN CURRENT- LIMIT CIRCUIT 19 11 12 15 10 28 13 14 26 8 25 24 23 17 18 22 21 20 16 12 3 4 6 5 7 9 27 Figure 1. |
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