ADP3178JRZ-REEL7

ADP3178JRZ-REEL7 Datasheet

ADP3158/ADP3178

Part	Datasheet
ADP3178JRZ-REEL7	ADP3178JRZ-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 4-Bit Digitally Programmable V to V Output N-Channel Synchronous Buck Driver Total Accuracy Over Temperature Two On-Board Linear Regulator Controllers Designed to Meet System Power Sequencing Requirements High Efficiency Current-Mode Operation Short Circuit Protection for Switching Regulator Overvoltage Protection Crowbar Protects Microprocessors with No Additional External Components APPLICATIONS Core Supply Voltage Generation for: Intel III Intel Celeron 4-Bit Programmable Synchronous Buck Controllers ADP3158/ADP3178 FUNCTIONAL BLOCK DIAGRAM UVLO & BIAS ADP3158/ ADP3178 OSCILLATOR PWM DRIVE REFERENCE REF DRVH DRVL GND LRFB1 VLR1 LRDRV1 LRFB2 VLR2 LRDRV2 COMP DAC+20% VID DAC VID3 VID2 VID1 VID0 GENERAL DESCRIPTION The ADP3158 and ADP3178 are highly efficient synchronous buck switching regulator controllers optimized for converting a 5 V main supply into the core supply voltage required by highperformance processors. These devices use an internal 4-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. They use 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 ADP3158 and ADP3178 also use 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 highperformance 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 it is always optimally positioned for a system transient. They also provide accurate and reliable short circuit protection and adjustable current limiting. The devices include 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 ADP3158 and ADP3178 contain two linear regulator controllers that are designed to drive external N-channel MOSFETs. The outputs are internally fixed at V and V in the ADP3158, while the ADP3178 provides adjustable outputs that are set using an external resistor divider. These linear regulators are used to generate the auxiliary voltages AGP, GTL, etc. required in most motherboard designs, and have been designed to provide a high bandwidth loadtransient response. The ADP3158 and ADP3178 are specified over the commercial temperature range of 0°C to 70°C and are available in a 16-lead SOIC package. ADOPT is a trademark of Analog Devices, Inc. Pentium is a registered trademark of Intel Corporation. Celeron is a 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, TA = to unless otherwise noted. Parameter Conditions Min Typ Max Unit SWITCHING REGULATOR Output Accuracy V Output V Output V Output Line Regulation Crowbar Trip Point Crowbar Reset Point Crowbar Response Time VID INPUTS Input Low Voltage Input High Voltage Input Current Pull-Up Resistance Internal Pull-Up Voltage VCROWBAR tCROWBAR ORDERING GUIDE LDO Voltage V, V Adjustable Package Description SO = Small Outline Package SO = Small Outline Package Package Option R-16A SO-16 R-16A SO-16 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 ADP3158/ADP3178 feature 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 SUPPLY CURRENT mA NUMBER OF PARTS % Performance Characteristics 0 100 200 300 400 500 600 700 800 OSCILLATOR FREQUENCY kHz TPC Supply Current vs. Operating Frequency Using MOSFETs of Figure 3 TEK RUN TRIG'D VCC 1 VCORE 2 CH1 5.00V BW CH2 500mV BW M 10.0ms A CH1 s 5.90V TPC Power-On Start-Up Waveform TEK RUN DRVH TRIG'D DRVL CH1 5.00V BW CH2 5.00V BW M A CH1 5.90V TPC Gate Switching Waveforms Using MOSFETs of Figure 3 25 TA = VOUT = 1.65V 15 10 OUTPUT ACCURACY % of Nominal TPC Output Accuracy Distribution TEK RUN TRIG'D DRVH DRVL CH1 2.00V BW CH2 2.00V BW M 1.00ns A CH1 5.88V TPC Driver Transition Waveforms Using MOSFETs of Figure 3 ADP3158/ADP3178 4-BIT CODE ADP3158/ Addition to ORDERING GUIDE 3 Edits to the On-board Linear Regulator Controllers section 5 Edits to Figure 3 6 Edits to Equations 24, 27, and 31 11 Addition of new text to Linear Regulators section 12 PRINTED IN U.S.A.

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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 4-Bit Digitally Programmable V to V Output N-Channel Synchronous Buck Driver Total Accuracy Over Temperature Two On-Board Linear Regulator Controllers Designed to Meet System Power Sequencing Requirements High Efficiency Current-Mode Operation Short Circuit Protection for Switching Regulator Overvoltage Protection Crowbar Protects Microprocessors with No Additional External Components

APPLICATIONS Core Supply Voltage Generation for:

Intel III Intel Celeron
4-Bit Programmable Synchronous Buck Controllers

ADP3158/ADP3178

FUNCTIONAL BLOCK DIAGRAM

UVLO & BIAS

ADP3158/ ADP3178

OSCILLATOR

PWM DRIVE

REFERENCE REF

DRVH

DRVL GND

LRFB1

VLR1

LRDRV1 LRFB2

VLR2

LRDRV2 COMP

DAC+20%

VID DAC

VID3 VID2 VID1 VID0

GENERAL DESCRIPTION The ADP3158 and ADP3178 are highly efficient synchronous buck switching regulator controllers optimized for converting a 5 V main supply into the core supply voltage required by highperformance processors. These devices use an internal 4-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. They use 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 ADP3158 and ADP3178 also use 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 highperformance 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 it is always optimally positioned for a system transient. They also provide accurate and reliable short circuit protection and adjustable current limiting. The devices include 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 ADP3158 and ADP3178 contain two linear regulator controllers that are designed to drive external N-channel MOSFETs. The outputs are internally fixed at V and V in the ADP3158, while the ADP3178 provides adjustable outputs that are set using an external resistor divider. These linear regulators are used to generate the auxiliary voltages AGP, GTL, etc. required in most motherboard designs, and have been designed to provide a high bandwidth loadtransient response.

The ADP3158 and ADP3178 are specified over the commercial temperature range of 0°C to 70°C and are available in a 16-lead SOIC package.

ADOPT is a trademark of Analog Devices, Inc. Pentium is a registered trademark of Intel Corporation. Celeron is a 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, TA = to unless otherwise noted.

Parameter

Conditions

Min Typ Max

Unit

SWITCHING REGULATOR Output Accuracy V Output V Output V Output Line Regulation Crowbar Trip Point Crowbar Reset Point Crowbar Response Time

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

VCROWBAR tCROWBAR
ORDERING GUIDE

LDO Voltage

V, V Adjustable

Package Description

SO = Small Outline Package SO = Small Outline Package

Package Option

R-16A SO-16 R-16A SO-16

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 ADP3158/ADP3178 feature 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

SUPPLY CURRENT mA NUMBER OF PARTS %

Performance Characteristics
0 100 200 300 400 500 600 700 800 OSCILLATOR FREQUENCY kHz

TPC Supply Current vs. Operating Frequency Using MOSFETs of Figure 3

TEK RUN

TRIG'D

VCC 1

VCORE 2

CH1 5.00V BW CH2 500mV BW M 10.0ms A CH1 s
5.90V

TPC Power-On Start-Up Waveform

TEK RUN DRVH

TRIG'D

DRVL

CH1 5.00V BW CH2 5.00V BW M A CH1
5.90V

TPC Gate Switching Waveforms Using MOSFETs of Figure 3
25 TA = VOUT = 1.65V
15 10

OUTPUT ACCURACY % of Nominal

TPC Output Accuracy Distribution

TEK RUN

TRIG'D

DRVH

DRVL

CH1 2.00V BW CH2 2.00V BW M 1.00ns A CH1
5.88V

TPC Driver Transition Waveforms Using MOSFETs of Figure 3

ADP3158/ADP3178
4-BIT CODE

ADP3158/
Addition to ORDERING GUIDE 3

Edits to the On-board Linear Regulator Controllers section 5

Edits to Figure 3 6

Edits to Equations 24, 27, and 31 11

Addition of new text to Linear Regulators section 12

PRINTED IN U.S.A.

Notice: we do not provide any warranties that information, datasheets, application notes, circuit diagrams, or software stored on this website are up-to-date or error free. The archived ADP3178JRZ-REEL7 Datasheet file may be downloaded here without warranties.

Datasheet ID: ADP3178JRZ-REEL7 517847