Details, datasheet, quote on part number: ADP3190
PartADP3190
CategoryPower Management
Description6-Bit, Programmable 2-/3-/4-Phase, Synchronous Buck Controller

The ADP3190/ADP3190A are highly efficient, multiphase, synchronous buck switching regulator controllers optimized for converting a 5 V or 12 V main supply into the core supply voltage required by high performance Intel processors. They use 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. The devices use 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 ADP3190/ADP3190A also include programmable, no-load offset and slope functions to adjust the output voltage as a function of the load current, so it is always optimally positioned for a system transient. The ADP3190/ADP3190A also provide 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 ADP3190 is a replacement for the ADP3188. A built-in shunt regulator allows the part to be connected to the 12 V system supply through a series resistor.

The devices are specified over the commercial temperature range of 0°C to +85°C and are available in a 28-lead TSSOP and a 28-lead QSOP.

Features

Selectable 2-, 3-, or 4-phase Operation at Up to 1 MHz per Phase
±9.5 mV Worst-case Differential Sensing Error over Temperature
Logic-level PWM Outputs for Interface to External High Power Drivers
PWM Flex-Mode™ Architecture for Excellent Load Transient Performance
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
CompanyAnalog Devices
DatasheetDownload ADP3190 datasheet
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Features, Applications
FEATURES

Selectable or 4-phase operation to 1 MHz per phase ±9.5 mV worst-case differential sensing error over temperature Logic-level PWM outputs for interface to external high power drivers PWM Flex-ModeTM architecture for excellent load transient performance Active current balancing between all output phases Built-in power good/crowbar blanking supports on-the-fly VID code changes 6-bit digitally programmable 1.6 V output Programmable short circuit protection with programmable latch-off delay

SHUNT REGULATOR (ADP3190 ONLY) OSCILLATOR EN 11 GND 19 DAC +150mV CSREF CURRENT BALANCING CIRCUIT UVLO SHUTDOWN AND BIAS SET CMP RESET EN

APPLICATIONS
Desktop PC power supplies for Next-generation Intel® processors VRM modules Games consoles

The ADP3190/ADP3190A1 are highly efficient, multiphase, synchronous buck switching regulator controllers optimized for converting 12 V main supply into the core supply voltage required by high performance Intel processors. They use 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. The devices use 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 or 4-phase operation, allowing for the construction up to four complementary buck switching stages. The ADP3190/ADP3190A also include programmable, no-load offset and slope functions to adjust the output voltage as a function of the load current, it is always optimally positioned for a system transient. The ADP3190/ADP3190A also provide 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 is a replacement for the ADP3188. A built-in shunt regulator allows the part to be connected to the 12 V system supply through a series resistor. The devices are specified over the commercial temperature range to +85°C and are available a 28-lead TSSOP and a 28-lead QSOP.

Protected U. S. Patent Number 6,683,441; other patents pending.

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: 781.461.3113 ©2006 Analog Devices, Inc. All rights reserved.

Features.............................................................................................. 1 Applications....................................................................................... 1 General Description......................................................................... 1 Functional Block Diagram.............................................................. 1 Specifications..................................................................................... 3 Absolute Maximum Ratings............................................................ 5 ESD Caution.................................................................................. 5 Pin Configuration and Function Descriptions............................. 6 Typical Performance Characteristics and Test Circuits............... 7 Theory of Operation........................................................................ 8 Startup Sequence.......................................................................... 8 Master Clock Frequency.............................................................. 8 Output Voltage Differential Sensing.......................................... 8 Output Current Sensing.............................................................. 8 Active Impedance Control Mode............................................... 9 Current-Control Mode and Thermal Balance.......................... 9 Voltage Control Mode.................................................................. 9 Soft Start........................................................................................ 9 Current-Limit, Short-Circuit, and Latch-Off Protection...... 10 Dynamic VID.............................................................................. 10 Power Good Monitoring........................................................... 12 Output Crowbar......................................................................... 12 Output Enable and UVLO........................................................ 12 Application Information................................................................ 14 Setting the Clock Frequency..................................................... 14 Soft Start and Current-Limit Latch-Off Delay Times........... 14 Inductor Selection...................................................................... 14 Designing an Inductor............................................................... 15 Output Droop Resistance.......................................................... 15 Inductor DCR Temperature Correction................................. 16 Output Offset.............................................................................. 16 COUT Selection............................................................................. 17 Power MOSFETs......................................................................... 18 Ramp Resistor Selection............................................................ 19 COMP Pin Ramp....................................................................... 19 Current-Limit Setpoint.............................................................. 19 Feedback Loop Compensation Design.................................... 19 CIN Selection and Input Current di/dt Reduction.................. 21 Tuning the ADP3190/ADP3190A............................................ 22 Replacing the ADP3188 with the ADP3190........................... 24 Choosing Between the ADP3190 and the ADP3190A........ 24 Layout and Component Placement.............................................. 25 General Recommendations....................................................... 25 Power Circuitry Recommendations........................................ 25 Signal Circuitry Recommendations......................................... 25 Outline Dimensions....................................................................... 26 Ordering Guide.......................................................................... 26

VCC 5 V, FBRTN = GND, to +85°C, unless otherwise noted. 1 Table 1.

Parameter ERROR AMPLIFIER Output Voltage Range Accuracy Line Regulation Input Bias Current FBRTN Current Output Current Gain Bandwidth Product Slew Rate VID INPUTS Input Low Voltage Input High Voltage Input Current, Input Voltage Low Input Current, Input Voltage High Pull-up Resistance Internal Pull-up Voltage VID Transition Delay Time 2 No CPU Detection Turn-off Delay Time2 OSCILLATOR Frequency Range2 Frequency Variation Symbol VCOMP VFB IFB IFBRTN IO(ERR) GBW(ERR) Conditions Min Typ Max VCC +8.0 +9.5 Units V mV MHz V/s ns

Relative to nominal DAC output, referenced to FBRTN, CSSUM = CSCOMP, VOUT 1 V Relative to nominal DAC output, referenced to FBRTN, CSSUM = CSCOMP, VOUT 1 V VCC 5.25 V

VID code change to FB change VID code change 11111 to PWM going low

Output Voltage RAMPADJ Output Voltage RAMPADJ Input Current Range CURRENT SENSE AMPLIFIER Offset Voltage Input Bias Current Gain Bandwidth Product Slew Rate Input Common-Mode Range Positioning Accuracy Output Voltage Range Output Current CURRENT BALANCE CIRCUIT Common-Mode Range Input Resistance Input Current Input Current Matching 3


 

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