|Description||4-Bit Programmable Synchronous Buck Controller|
|Datasheet||Download ADP3179JRU datasheet
|Cross ref.||Similar parts: LM20242, LM20323, LM20333, LM20343, LM25005, LM25116, LM25117, LM25117-Q1, LM25118, LM25118-Q1|
FEATURES Optimally Compensated Active Voltage Positioning with Gain and Offset Adjustment (ADOPTTM) for Superior Load Transient Response Complies with VRM 8.4 Specifications with Lowest System Cost 4-Bit Digitally Programmable 2.05 V Output N-Channel Synchronous Buck Driver Two On-Board Linear Regulator Controllers Total Accuracy 0.8% 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 Supply Voltage Generation for: Intel Pentium® III Intel CeleronTM
UVLO & BIAS OSCILLATOR SET RESET CROWBAR REFERENCE GND LRDRV2 gm COMP REF VID DAC CMP + CS+ FB PWRGD REF PWM DRIVE DRVL DRVH
The ADP3159 and ADP3179 are highly efficient output synchronous buck switching regulator controllers optimized for converting 5 V main supply into the core supply voltage required by high-performance 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 1.3 V and 2.05 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 ADP3159 and ADP3179 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 high-performance processors, with the minimum number
of output capacitors and smallest footprint. Unlike voltagemode and standard current-mode architectures, active voltage positioning adjusts the output voltage as a function of the load current it is always optimally positioned for a system transient. The devices also provide accurate and reliable short circuit protection and adjustable current limiting. They also 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 20%. The ADP3159 and ADP3179 contain two fixed-output voltage linear regulator controllers that are designed to drive external N-channel MOSFETs. The outputs are internally fixed 2.5 V and V in the ADP3159, while the ADP3179 provides adjustable output, which is 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 load-transient response. The ADP3159 and ADP3179 are specified over the commercial temperature range to 70°C and are available a 20-lead TSSOP 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 www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 2001
Parameter FEEDBACK INPUT Output Accuracy 1.3 V Output 1.65 V Output 2.05 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 OSCILLATOR Off Time CT Charge Current ERROR AMPLIFIER Output Resistance Transconductance Output Current Maximum Output Voltage Output Disable Threshold 3 dB Bandwidth CURRENT SENSE Threshold Voltage Input Bias Current Response Time OUTPUT DRIVERS Output Resistance Output Transition Time LINEAR REGULATORS Feedback Current LR1 Feedback Voltage LR2 Feedback Voltage Driver Output Voltage POWER GOOD COMPARATOR Undervoltage Threshold Undervoltage Hysteresis Overvoltage Threshold Overvoltage Reset Point Output Voltage Low Response Time SUPPLY DC Supply Current2 UVLO Threshold Voltage UVLO HysteresisVOUT VCROWBAR tCROWBAR VIL(VID) VIH(VID) IVID RVID
Figure 1 Figure 1 Figure 1 VCC % of Nominal DAC Voltage % of Nominal DAC Voltage Overvoltage to DRVL Going High
RO(ERR) gm(ERR) FB Forced to VOUT 3% IO(ERR) VCOMP(MAX) FB Forced to VOUT 3% VCOMP(OFF) BWERR COMP = Open VCS(TH) ICS+, ICS tCS FB Forced to VOUT 3% FB 0.8 V COMP 1 V CS+ = CS = VOUT CS+ (CS) mV to DRVH Going Low 3000 pFRO(DRV(X)) , tF ILRFB(X) VLRFB(1) VLRFB(2) VLRDRV(X) VPWRGD(UV) VPWRGD(OV) VOL(PWRGD)
ADP3159 Figure 2, VCC V ADP3179 Figure 2, VCC V ADP3159 Figure 2, VCC V ADP3179 Figure 2, VCC 12.6 V VCC 4.5 V, VLRFB(X) of Nominal DAC Voltage % of Nominal DAC Voltage % of Nominal DAC Voltage % of Nominal DAC Voltage IPWRGD(SINK) 1 mA
NOTES 1 All limits at temperature extremes are guaranteed via correlation using standard Statistical Quality Control (SQC). 2 Dynamic supply current is higher due to the gate charge being delivered to the external MOSFETs. Specifications subject to change without notice.
VCC. +15 V DRVH, DRVL, 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. to +150°C JA. 143°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.
NC No Connection. VID3, VID2, Voltage Identification DAC Inputs. These VID1, VID0 pins are pulled to an internal reference, providing a Logic One if left open. The DAC output programs the FB regulation voltage from V. 6 PWRGD Open drain output that signals when the output voltage is in the proper operating range. 15 LRFB1, Feedback connections for the linear LRFB2 regulator controllers. 14 LRDRV1, Gate drives for the respective linear LRDRV2 regulator N-channel MOSFETs. 9 FB Feedback Input. Error amplifier input for remote sensing of the output voltage. 10 CS Current Sense Negative Node. Negative input for the current comparator. 11 CS+ 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. 12 CT External capacitor connected from CT to ground sets the Off-time of the device. 13 COMP Error Amplifier Output and Compensation Point. The voltage at this output programs the output current control level between CS+ and CS. 16 VCC Supply Voltage for the device. 17 DRVL Low-Side MOSFET Drive. Gate drive for the synchronous rectifier N-channel MOSFET. The voltage at DRVL swings from GND to VCC. 18 DRVH High-side MOSFET Drive. Gate drive for the buck switch N-channel MOSFET. The voltage at DRVH swings from GND to VCC. 20 GND Ground Reference. GND should have a low impedance path to the source of hte synchronous MOSFET.Package Description Thin Shrink Small Outline Thin Shrink Small Outline
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 ADP3159 and the ADP3179 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.
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