ADP3170JRUZ-REEL7

ADP3170JRUZ-REEL7 Datasheet

ADP3170

Part	Datasheet
ADP3170JRUZ-REEL7	ADP3170JRUZ-REEL7 (pdf)

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FEATURES Optimally Compensated Active Voltage Positioning with Gain and Offset Adjustment ADOPT for Superior Load Transient Response Complies with VRM Specifications with Lowest System Cost 5-Bit Digitally Programmable V to V Output N-Channel Synchronous Buck Controller Onboard V Linear Regulator Controller Total Accuracy Over Temperature High Efficiency Current-Mode Operation Short Circuit Protection Power Good Output Overvoltage Protection Crowbar Protects Microprocessors with No Additional External Components APPLICATIONS Core and V Standby Supplies for Next Generation Intel III Processors VRM Compatible Single Phase Core Controller ADP3170 FUNCTIONAL BLOCK DIAGRAM SD GND UVLO AND BIAS 3.0V REFERENCE SET OSCILLATOR RESET CROWBAR PWM LOGIC DAC +20% LRFB LRDRV 1.8V COMP ADP3170 VID DAC DAC gm DRVH DRVL PGND PWRGD CS+ FB VID3 VID2 VID1 VID0 VID25 GENERAL DESCRIPTION The ADP3170 is a highly efficient output synchronous buck switching regulator controller optimized for converting a 5 V main supply into the core supply voltage required by next generation Intel Celeron processors. The ADP3170 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 ADP3170 uses a current mode, constant off-time architecture to drive two N-channel MOSFETs at a programmable switching frequency that can be optimized for regulator size and efficiency. The ADP3170 also uses a unique supplemental regulation technique called Analog Devices Optimal Positioning Technology 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 ADP3170 also provides accurate and reliable short circuit protection and adjustable current limiting. It also includes an integrated overvoltage crowbar function to protect the microprocessor from destruction in case the core supply exceeds the nominal programmed voltage by more than The ADP3170 contains a V linear regulator controller that is designed to drive an external N-channel MOSFET. This linear regulator can be used to generate auxiliary voltages such as V standby power required in most motherboard designs, and has been designed to provide a high bandwidth load-transient response. The ADP3170 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 Conditions Max Unit FEEDBACK INPUT Output 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 ORDERING GUIDE Temperature Range 0°C to 70°C Package Description TSSOP Package Option RU-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 ADP3170 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 ADP3170 PIN CONFIGURATION RU-20 VID3 1 20 GND VID2 2 19 PGND VID1 3 18 DRVH VID0 4 17 DRVL VID25 PWRGD 5 ADP3170 16 VCC 6 TOP VIEW 15 LRFB Not to Scale 14 LRDRV 13 COMP 12 CT 11 CS+ Pin No. 9 10 11 12 13 14 15 16 17 Mnemonic VID3, VID2, VID1, VID0, VID25 PWRGD REF SD FB CS+ CT COMP LRDRV LRFB VCC DRVL DRVH PGND PIN FUNCTION DESCRIPTIONS Function Voltage Identification DAC Inputs. These pins are pulled up to an internal reference, providing a logic one if left open. The DAC output programs the FB regulation voltage from V to V. Open drain output that signals when the output voltage is in the proper operating range. V Reference Output. Regulator Shutdown. Pulling this pin high turns off both MOSFETs of the switching regulator. SD has no effect on the linear regulator controller. Feedback Input. Error amplifier input for remote sensing of the output voltage. Current Sense Negative Node. Negative input for the current comparator. Current Sense Positive Node. Positive input for the current comparator. The output current is sensed as a voltage at this pin with respect to External capacitor connected from CT to ground sets the OFF-Time of the device. Error Amplifier Output and Compensation Point. The voltage at this output programs the output current control level between CS+ and Gate Drive for the V linear regulator N-channel MOSFET. Feedback Connections for the V linear regulator controller. Supply Voltage for the ADP3170. Low-Side MOSFET Drive. Gate drive for the synchronous rectifier N-channel MOSFET. The voltage at DRVL swings from GND to VCC. High-Side MOSFET Drive. Gate drive for the buck switch N-channel MOSFET. The voltage at DRVH swings from GND to VCC. Power Ground. PGND should have a low impedance path to the source of the synchronous MOSFET. Small-Signal Ground. This ground reference can be used in conjunction with FB to provide remote sensing of the output voltage at the CPU pins. 5-BIT CODE VFB ADP3170 1 VID3 2 VID2 3 VID1 4 VID0 5 VID25 6 PWRGD 7 REF 8 SD 9 FB 10 GND 20 PGND 19 DRVH 18 DRVL 17

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FEATURES Optimally Compensated Active Voltage Positioning
with Gain and Offset Adjustment ADOPT for Superior Load Transient Response Complies with VRM Specifications with Lowest System Cost 5-Bit Digitally Programmable V to V Output N-Channel Synchronous Buck Controller Onboard V Linear Regulator Controller Total Accuracy Over Temperature High Efficiency Current-Mode Operation Short Circuit Protection Power Good Output Overvoltage Protection Crowbar Protects Microprocessors with No Additional External Components

APPLICATIONS Core and V Standby Supplies for Next Generation Intel III Processors

VRM Compatible Single Phase Core Controller

ADP3170

FUNCTIONAL BLOCK DIAGRAM

SD GND

UVLO AND BIAS
3.0V REFERENCE

SET OSCILLATOR

RESET

CROWBAR

PWM LOGIC

DAC +20%

LRFB LRDRV
1.8V

COMP

ADP3170

VID DAC

DAC gm

DRVH DRVL PGND

PWRGD

CS+ FB

VID3 VID2 VID1 VID0 VID25

GENERAL DESCRIPTION The ADP3170 is a highly efficient output synchronous buck switching regulator controller optimized for converting a 5 V main supply into the core supply voltage required by next generation Intel Celeron processors. The ADP3170 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 ADP3170 uses a current mode, constant off-time architecture to drive two N-channel MOSFETs at a programmable switching frequency that can be optimized for regulator size and efficiency.

The ADP3170 also uses a unique supplemental regulation technique called Analog Devices Optimal Positioning Technology 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 ADP3170 also provides accurate and reliable short circuit protection and adjustable current limiting. It also includes an integrated overvoltage crowbar function to protect the microprocessor from destruction in case the core supply exceeds the nominal programmed voltage by more than

The ADP3170 contains a V linear regulator controller that is designed to drive an external N-channel MOSFET. This linear regulator can be used to generate auxiliary voltages such as V standby power required in most motherboard designs, and has been designed to provide a high bandwidth load-transient response.

The ADP3170 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

Conditions

Max Unit

FEEDBACK INPUT Output 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
ORDERING GUIDE

Temperature Range 0°C to 70°C

Package Description TSSOP

Package Option RU-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 ADP3170 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

ADP3170

PIN CONFIGURATION RU-20

VID3 1
20 GND

VID2 2
19 PGND

VID1 3
18 DRVH

VID0 4
17 DRVL

VID25 PWRGD
5 ADP3170 16 VCC
6 TOP VIEW 15 LRFB Not to Scale
14 LRDRV
13 COMP
12 CT
11 CS+

Pin No.
9 10 11
12 13
14 15 16 17

Mnemonic VID3, VID2, VID1, VID0, VID25 PWRGD REF SD

FB CS+

CT COMP

LRDRV LRFB VCC DRVL

DRVH

PGND

PIN FUNCTION DESCRIPTIONS

Function

Voltage Identification DAC Inputs. These pins are pulled up to an internal reference, providing a logic one if left open. The DAC output programs the FB regulation voltage from V to V. Open drain output that signals when the output voltage is in the proper operating range. V Reference Output. Regulator Shutdown. Pulling this pin high turns off both MOSFETs of the switching regulator. SD has no effect on the linear regulator controller. Feedback Input. Error amplifier input for remote sensing of the output voltage. Current Sense Negative Node. Negative input for the current comparator. Current Sense Positive Node. Positive input for the current comparator. The output current is sensed as a voltage at this pin with respect to External capacitor connected from CT to ground sets the OFF-Time of the device. Error Amplifier Output and Compensation Point. The voltage at this output programs the output current control level between CS+ and Gate Drive for the V linear regulator N-channel MOSFET. Feedback Connections for the V linear regulator controller. Supply Voltage for the ADP3170. Low-Side MOSFET Drive. Gate drive for the synchronous rectifier N-channel MOSFET. The voltage at DRVL swings from GND to VCC. High-Side MOSFET Drive. Gate drive for the buck switch N-channel MOSFET. The voltage at DRVH swings from GND to VCC. Power Ground. PGND should have a low impedance path to the source of the synchronous MOSFET. Small-Signal Ground. This ground reference can be used in conjunction with FB to provide remote sensing of the output voltage at the CPU pins.
5-BIT CODE VFB

ADP3170
1 VID3 2 VID2 3 VID1 4 VID0 5 VID25 6 PWRGD 7 REF 8 SD 9 FB 10

GND 20 PGND 19 DRVH 18 DRVL 17

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Datasheet ID: ADP3170JRUZ-REEL7 517852