ADP3164JRUZ-REEL7

ADP3164JRUZ-REEL7 Datasheet

ADP3164

Part	Datasheet
ADP3164JRUZ-REEL7	ADP3164JRUZ-REEL7 (pdf)

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FEATURES ADOPT Optimal Positioning Technology for Superior Load Transient Response and Fewest Output Capacitors Complies with VRM with Lowest System Cost 4-Phase Operation at up to 500 kHz per Phase Quad Logic-Level PWM Outputs for Interface to External High-Power Drivers Active Current Balancing between All Output Phases Accurate Multiple VRM Module Current Sharing 5-Bit Digitally Programmable V to V Output Total Output Accuracy Over Temperature Current-Mode Operation Short Circuit Protection Enhanced Power Good Output Detects Open Outputs in Multi-VRM Power Systems Overvoltage Protection Crowbar Protects Microprocessors with No Additional External Components APPLICATIONS Desktop PC Power Supplies for: Intel 4 Processors VRM Modules 5-Bit Programmable 4-Phase Synchronous Buck Controller ADP3164 REF GND FUNCTIONAL BLOCK DIAGRAM UVLO & BIAS ADP3164 SET RESET CROWBAR 3.0V REFERENCE 4-PHASE DRIVER LOGIC OSCILLATOR DAC + 20% POWER GOOD PWM1 PWM2 PWM3 PWM4 PGND PWRGD SHARE COMP SOFT START DAC 20% VID DAC CS+ FB VID4 VID3 VID2 VID1 VID0 GENERAL DESCRIPTION The ADP3164 is a highly efficient 4-phase synchronous buck switching regulator controller optimized for converting a 12 V main supply into the core supply voltage required by high performance Intel processors. The ADP3164 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 V and V. The ADP3164 uses a current mode PWM architecture to drive the logic-level outputs at a programmable switching frequency that can be optimized for VRM size and efficiency. The four output phases share the dc output current to reduce overall output voltage ripple. An active current balancing function ensures that all phases carry equal portions of the total load current, even under large transient loads, to minimize the size of the inductors. The ADP3164 also uses a unique supplemental regulation technique called active voltage positioning 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 ADP3164 also provides accurate and reliable short circuit protection, adjustable current limiting, and an enhanced Power Good output that can detect open outputs in any phase for single or multi-VRM systems. The ADP3164 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. 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. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel 781/329-4700 Fax 781/326-8703 Analog Devices, Inc., 2001 VCC = 12 V, IREF = 150 TA = to unless otherwise noted. Parameter Symbol Conditions Min Typ Max Unit FEEDBACK INPUT Accuracy V Output V Output V Output Line Regulation Input Bias Current Crowbar Trip Point Crowbar Reset Point Crowbar Response Time REFERENCE Output Voltage Output Current VID INPUTS Input Low Voltage Input High Voltage Input Current Pull-Up Resistance Internal Pull-Up Voltage ORDERING GUIDE Temperature Range 0°C to 70°C Package Description Thin Shrink Small Outline Package Option RU-20 TSSOP-20 CAUTION ESD electrostatic discharge sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the ADP3164 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high-energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality. WARNING! ESD SENSITIVE DEVICE ADP3164 PIN FUNCTION DESCRIPTIONS Pin Mnemonic VID4 VID0 6 SHARE 7 COMP 8 GND 9 FB 10 CT 11 PWRGD 12 CS+ 13 14 PGND 15 PWM4 16 PWM3 17 PWM2 18 PWM1 19 REF 20 VCC Function Voltage Identification DAC Inputs. These pins are pulled up to an internal 3 V reference, providing a Logic 1 if left open. The DAC output programs the FB regulation voltage from V to V. Leaving all five DAC inputs open results in the ADP3164 going into a “No CPU” mode, shutting off its PWM outputs. Current Sharing Output. This pin is connected to the SHARE pins of other ADP3164s in multiple VRM systems to ensure proper current sharing between the converters. The voltage at this output programs the output current control level between CS+ and Error Amplifier Output and Compensation Point. Ground. FB, REF, and the VID DAC of the ADP3164 are referenced to this ground. This is a low current ground that can also be used as a return for the FB pin in remote voltage sensing applications. Feedback Input. Error amplifier input for remote sensing of the output voltage. External capacitor CT connection to ground sets the frequency of the device. Open drain output that signals when the output voltage is outside of the proper operating range or when a phase is not supplying current even if the output voltage is in specification. Current Sense Positive Node. Positive input for the current comparator. The output current is sensed as a voltage at this pin with respect to Current Sense Negative Node. Negative input for the current comparator. Power Ground. All internal biasing and logic output signals of the ADP3164 are referenced to this ground. Logic-Level Output for the Phase 4 Driver. Logic-Level Output for the Phase 3 Driver. Logic-Level Output for the Phase 2 Driver. Logic-Level Output for the Phase 1 Driver. V Reference Output. Supply Voltage for the ADP3164. 5-BIT CODE 100nF ADP3164 1 VID4 2 VID3 3 VID2 4 VID1 VCC 20 REF 19 PWM1 18 PWM2 17 5 VID0 PWM3 16 6 SHARE PWM4 15 7 COMP PGND 14 8 GND CS+ 12 10 CT PWRGD 11 12V 100nF AD820 1.2V Figure Closed-Loop Output Voltage Accuracy Test Circuit Typical Performance TA = VOUT = 1.6V NUMBER OF PARTS % FREQUENCY MHz

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FEATURES ADOPT Optimal Positioning Technology for Superior

Load Transient Response and Fewest Output Capacitors Complies with VRM with Lowest System Cost 4-Phase Operation at up to 500 kHz per Phase Quad Logic-Level PWM Outputs for Interface to External High-Power Drivers Active Current Balancing between All Output Phases Accurate Multiple VRM Module Current Sharing 5-Bit Digitally Programmable V to V Output Total Output Accuracy Over Temperature Current-Mode Operation Short Circuit Protection Enhanced Power Good Output Detects Open Outputs in Multi-VRM Power Systems Overvoltage Protection Crowbar Protects Microprocessors with No Additional External Components

APPLICATIONS Desktop PC Power Supplies for:

Intel 4 Processors VRM Modules
5-Bit Programmable 4-Phase Synchronous Buck Controller

ADP3164

REF GND

FUNCTIONAL BLOCK DIAGRAM

UVLO & BIAS

ADP3164

SET RESET CROWBAR
3.0V REFERENCE
4-PHASE DRIVER LOGIC

OSCILLATOR

DAC + 20%

POWER GOOD

PWM1 PWM2 PWM3 PWM4 PGND

PWRGD

SHARE

COMP

SOFT START

DAC 20%

VID DAC

CS+ FB

VID4 VID3 VID2 VID1 VID0

GENERAL DESCRIPTION The ADP3164 is a highly efficient 4-phase synchronous buck switching regulator controller optimized for converting a 12 V main supply into the core supply voltage required by high performance Intel processors. The ADP3164 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 V and V. The ADP3164 uses a current mode PWM architecture to drive the logic-level outputs at a programmable switching frequency that can be optimized for VRM size and efficiency. The four output phases share the dc output current to reduce overall output voltage ripple. An active current balancing function ensures that all phases carry equal portions of the total load current, even under large transient loads, to minimize the size of the inductors.

The ADP3164 also uses a unique supplemental regulation technique called active voltage positioning 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 ADP3164 also provides accurate and reliable short circuit protection, adjustable current limiting, and an enhanced Power Good output that can detect open outputs in any phase for single or multi-VRM systems.

The ADP3164 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.

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.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel 781/329-4700

Fax 781/326-8703

Analog Devices, Inc., 2001

VCC = 12 V, IREF = 150 TA = to unless otherwise noted.

Parameter

Symbol Conditions

Min Typ Max Unit

FEEDBACK INPUT Accuracy V Output V Output V Output Line Regulation Input Bias Current Crowbar Trip Point Crowbar Reset Point Crowbar Response Time

REFERENCE Output Voltage Output Current

VID INPUTS Input Low Voltage Input High Voltage Input Current Pull-Up Resistance Internal Pull-Up Voltage
ORDERING GUIDE

Temperature Range 0°C to 70°C

Package Description Thin Shrink Small Outline

Package Option RU-20 TSSOP-20

CAUTION ESD electrostatic discharge sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the ADP3164 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high-energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality.

WARNING!

ESD SENSITIVE DEVICE

ADP3164

PIN FUNCTION DESCRIPTIONS

Pin Mnemonic VID4

VID0
6 SHARE
7 COMP 8 GND
9 FB 10 CT 11 PWRGD
12 CS+
13 14 PGND 15 PWM4 16 PWM3 17 PWM2 18 PWM1 19 REF 20 VCC

Function

Voltage Identification DAC Inputs. These pins are pulled up to an internal 3 V reference, providing a Logic 1 if left open. The DAC output programs the FB regulation voltage from V to V. Leaving all five DAC inputs open results in the ADP3164 going into a “No CPU” mode, shutting off its PWM outputs. Current Sharing Output. This pin is connected to the SHARE pins of other ADP3164s in multiple VRM systems to ensure proper current sharing between the converters. The voltage at this output programs the output current control level between CS+ and Error Amplifier Output and Compensation Point. Ground. FB, REF, and the VID DAC of the ADP3164 are referenced to this ground. This is a low current ground that can also be used as a return for the FB pin in remote voltage sensing applications. Feedback Input. Error amplifier input for remote sensing of the output voltage. External capacitor CT connection to ground sets the frequency of the device. Open drain output that signals when the output voltage is outside of the proper operating range or when a phase is not supplying current even if the output voltage is in specification. Current Sense Positive Node. Positive input for the current comparator. The output current is sensed as a voltage at this pin with respect to Current Sense Negative Node. Negative input for the current comparator. Power Ground. All internal biasing and logic output signals of the ADP3164 are referenced to this ground. Logic-Level Output for the Phase 4 Driver. Logic-Level Output for the Phase 3 Driver. Logic-Level Output for the Phase 2 Driver. Logic-Level Output for the Phase 1 Driver. V Reference Output. Supply Voltage for the ADP3164.
5-BIT CODE
100nF

ADP3164
1 VID4 2 VID3 3 VID2 4 VID1

VCC 20

REF 19 PWM1 18

PWM2 17
5 VID0

PWM3 16
6 SHARE PWM4 15
7 COMP

PGND 14
8 GND

CS+ 12
10 CT

PWRGD 11
12V 100nF

AD820 1.2V

Figure Closed-Loop Output Voltage Accuracy Test Circuit

Typical Performance

TA = VOUT = 1.6V

NUMBER OF PARTS %

FREQUENCY MHz

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Datasheet ID: ADP3164JRUZ-REEL7 517850