Details, datasheet, quote on part number: ADP3161J
CategoryPower Management => Regulators => Switching Regulators
TitleRegulator Controller
Description4-Bit Programmable 2-Phase Synchronous Buck Controller
CompanyAnalog Devices
DatasheetDownload ADP3161J datasheet
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Features, Applications

FEATURES ADOPTTM Optimal Positioning Technology for Superior Load Transient Response and Fewest Output Capacitors Active Current Balancing Between Both Output Phases VRM 8.4-Compatible Digitally Programmable 2.05 V Output Dual Logic-Level PWM Outputs for Interface to External High-Power Drivers Total Output Accuracy 0.8% Over Temperature Current-Mode Operation Short Circuit Protection Power-Good Output Overvoltage Protection Crowbar Protects Microprocessors with No Additional External Components APPLICATIONS Desktop PC Power Supplies for: Intel Pentium® III Processors VRM Modules


The is a highly efficient dual output synchronous buck switching regulator controller optimized for converting 12 V main supply into the core supply voltage required by highperformance processors such as Pentium® III. The ADP3161 uses 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 1.3 V and 2.05 V. The ADP3161 uses a current mode PWM architecture to drive two logic-level outputs at a programmable switching frequency that can be optimized for VRM size and efficiency. The output signals are 180 degrees out of phase, allowing for the construction of two complementary buck switching stages. These two stages share the dc output current to reduce overall output voltage ripple. An active current balancing function ensures that both phases carry equal portions of the total load current, even under large transient loads, to minimize the size of the inductors.

The ADP3161 also uses a unique supplemental regulation technique called active voltage positioning 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 ADP3161 also provides accurate and reliable short circuit protection and adjustable current limiting. The ADP3161 is specified over the commercial temperature range to 70°C and is available a 16-lead narrow body SOIC 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 which 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 World Wide Web Site: Fax: 781/326-8703 © Analog Devices, Inc., 2001

Parameter FEEDBACK INPUT Accuracy 1.3 V Output 1.6 V Output 2.05 V Output Line Regulation Input Bias Current Crowbar Trip Point Crowbar Reset Point Crowbar Response Time FB Low Comparator Threshold REFERENCE Output Voltage Output Current VID INPUTS Input Low Voltage Input High Voltage Input Current Pull-Up Resistance Internal Pull-Up Voltage OSCILLATOR Maximum Frequency2 Frequency Variation CT Charge Current ERROR AMPLIFIER Output Resistance Transconductance Output Current Maximum Output Voltage Output Disable Threshold ­3 dB Bandwidth CURRENT SENSE Threshold Voltage Symbol VFB Conditions


TPC 1 TPC 1 TPC 1 VCC 14 V Percent of Nominal Output Percent of Nominal Output Overvoltage to PWM Going Low


2.0 VFB V FB Forced to VOUT 3% 560 COMP = Open CS+ = VCC, FB Forced to VOUT 0.8 V COMP 1 V VCOMP 3 V CS+ = CS­ = VCC CS+ ­ (CS­) mV to PWM Going Low Percent of Nominal Output Percent of Nominal Output IPWRGD(SINK) µA FB Going High FB Going Low IPWM(SINK) 400 µA IPWM(SOURCE) 400 µA Per Phase, Relative to fCT 69

VCOMP /VCS Input Bias Current Response Time POWER GOOD COMPARATOR Undervoltage Threshold Overvoltage Threshold Output Voltage Low Response Time PWM OUTPUTS Output Voltage Low Output Voltage High Output Current Duty Cycle Limit2

Parameter SUPPLY DC Supply Current Normal Mode UVLO Mode UVLO Threshold Voltage UVLO Hysteresis Symbol Conditions Min Typ Max Unit

NOTES 1 All limits at temperature extremes are guaranteed via correlation using standard Statistical Quality Control (SQC) methods. 2 Guaranteed by design, not tested in production. Specifications subject to change without notice.

VCC. +15 V CS+, CS­. V to VCC 0.3 V All Other Inputs and Outputs. +10 V Operating Ambient Temperature Range. to 70°C Operating Junction Temperature. 125°C Storage Temperature Range. +150°C JA Two-Layer Board. 125°C/W Four-Layer Board. 81°C/W Lead Temperature (Soldering, 10 sec). 300°C Vapor Phase (60 sec). 215°C Infrared (15 sec). 220°C

*This is a stress rating only; operation beyond these limits can cause the device to be permanently damaged. Unless otherwise specified, all voltages are referenced to GND.

Function No Connect. Voltage Identification DAC Inputs. These pins are pulled to an internal reference, providing a Logic 1 if left open. The DAC output programs the FB regulation voltage from 2.05 V. Error Amplifier Output and Compensation Point. The voltage at this output programs the output current control level between CS+ and CS­. Feedback Input. Error amplifier input for remote sensing of the output voltage. External capacitor CT connection to ground sets the frequency of the device. Ground. All internal signals of the ADP3161 are referenced to this ground. Open drain output that signals when the output voltage is in the proper operating range. Current Sense Positive Node. Positive input for the current comparator. The output current is sensed as a voltage at this pin with respect to CS­. Logic-level output for the phase 2 driver. Logic-level output for the phase 1 driver. Current Sense Negative Node. Negative input for the current comparator. 3.0 V Reference Output. Supply Voltage for the ADP3161.

ORDERING GUIDE Temperature Package Range Description Narrow Body SOIC Package Option R-16A (SO-16)

CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the ADP3161 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.


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