DatasheetsPDF.com

ADP3181 Dataheets PDF



Part Number ADP3181
Manufacturers Analog Devices
Logo Analog Devices
Description 5-Bit or 6-Bit Programmable 2-/3-/4-Phase Synchronous Buck Controller
Datasheet ADP3181 DatasheetADP3181 Datasheet (PDF)

5-Bit or 6-Bit Programmable 2-,3-,4-Phase Synchronous Buck Controller ADP3181 FEATURES Selectable 2-, 3- or 4-phase operation at up to 1 MHz per phase ±14.5 mV worst-case mV 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 Digitally programmable output can be switched between VRM 9 (5-bit) and VRD 10 (6-bit) V.

  ADP3181   ADP3181


Document
5-Bit or 6-Bit Programmable 2-,3-,4-Phase Synchronous Buck Controller ADP3181 FEATURES Selectable 2-, 3- or 4-phase operation at up to 1 MHz per phase ±14.5 mV worst-case mV 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 Digitally programmable output can be switched between VRM 9 (5-bit) and VRD 10 (6-bit) VID codes Programmable short-circuit protection with programmable latch-off delay FUNCTIONAL BLOCK DIAGRAM VCC 28 RAMPADJ RT 14 13 ADP3181 EN 11 GND 19 DAC + 300mV CSREF CURRENTBALANCING CIRCUIT CMP RESET 2-/3-/4-PHASE DRIVER LOGIC RESET RESET CURRENT LIMIT 23 22 26 UVLO SHUTDOWN AND BIAS OSCILLATOR CMP SET RESET EN 27 PWM1 PWM2 CMP DAC – 250mV CMP PWRGD 10 DELAY 25 PWM3 PWM4 24 CROWBAR SW1 SW2 SW3 SW4 CSSUM CSREF CSCOMP APPLICATIONS Desktop PC power supplies for: Next-generation Intel® processors VRM modules ILIMIT 15 EN CURRENTLIMITING CIRCUIT 21 20 17 16 DELAY 12 GENERAL DESCRIPTION The ADP3181 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. The CPUID input selects whether the DAC codes match the VRM 9 or VRD 10 specifications. It 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 construction of up to four complementary buck-switching stages. The ADP3181 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 ADP3181 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. COMP 9 18 SOFT START 8 FB http://www.DataSheet4U.net/ PRECISION REFERENCE VID DAC 1 2 3 4 5 04796-0-001 datasheet pdf - http://www.DataSheet4U.net/ 7 6 FBRTN CPUID VID4 VID3 VID2 VID1 VID0 Figure 1. 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. 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. ADP3181 TABLE OF CONTENTS Specifications..................................................................................... 3 Test Circuits....................................................................................... 5 Absolute Maximum Ratings............................................................ 6 Pin Configuration and Function Descriptions............................. 7 Typical Performance Characteristics ............................................. 8 Theory of Operation ........................................................................ 9 Start-up Sequence......................................................................... 9 Master Clock Frequency............................................................ 10 Output Voltage Differential Sensing ........................................ 10 Output Current Sensing ............................................................ 11 Active Impedance Control Mode............................................. 11 Current Control Mode and Thermal Balance ....................... 11 Voltage Control Mode................................................................ 11 Soft Start ...................................................................................... 12 Current Limit, Short-Circuit, and Latch-Off Protection....... 12 Dynamic VID.............................................................................. 13 Power Good Monitoring ........................................................... 13 Output Crowbar ......................................................................... 13 Output Enable and UVLO ........................................................ 13 Application Information.........


2A07 ADP3181 BP1361


@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site.
(Privacy Policy & Contact)