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ADP3166

Analog Devices
Part Number ADP3166
Manufacturer Analog Devices
Description 4-Phase Synchronous Buck Controller
Published Oct 26, 2006
Detailed Description www.DataSheet4U.com 5-Bit Programmable 2-, 3-, 4-Phase Synchronous Buck Controller ADP3166* FEATURES Selectable 2-, 3- ...
Datasheet PDF File ADP3166 PDF File

ADP3166
ADP3166

Overview
www.
DataSheet4U.
com 5-Bit Programmable 2-, 3-, 4-Phase Synchronous Buck Controller ADP3166* FEATURES Selectable 2-, 3- or 4-Phase Operation at up to 1 MHz per Phase Differential Sensing Error ± 1% over Temperature Logic-Level PWM Outputs for Interface to External High Power Drivers Active Current Balancing between All Output Phases Built-in Power Good Blanking Supports On-the-Fly VID Code Changes 5-Bit Digitally Programmable 0.
8 V to 1.
55 V Output Short-Circuit Protection with Programmable Latch-Off Delay Overvoltage Protection Crowbar Logic Output APPLICATIONS Desktop PC Power Supplies Next-Generation AMD Processors VRM Modules GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM VCC 28 RAMPADJ RT 14 13 ADP3166 EN 11 UVLO SHUTDOWN AND BIAS OSCILLATOR + GND 19 CROWBAR 6 CSREF 2.
1V DAC + 300mV CSREF + – DAC – 300mV 23 SW1 PWRGD 10 DELAY 22 SW2 21 SW3 ILIMIT 15 EN CURRENT LIMIT CIRCUIT – + 20 SW4 17 CSSUM 16 CSREF 18 CSCOMP SOFT START COMP 9 – + + – 8 FB + – + – CURRENT BALANCING CIRCUIT + – CMP – CMP SET RESET EN 27 PWM1 + – CMP RESET 2-, 3- , 4-PHASE DRIVER LOGIC RESET 26 PWM2 25 PWM3 + – CMP RESET 24 PWM4 CROWBAR CURRENT LIMIT The ADP3166 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 AMD processors.
It 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 0.
8 V and 1.
55 V.
The ADP3166 also uses a multimode PWM architecture to drive the logic-level outputs at a programmable switching frequency that can be optimized for VRM 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 ADP3166 includes programmable no-load offset and slope functions to adjust the output voltage as a fun...


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