|Category||Analog & Mixed-Signal Processing => Power|
|Description||VRM 8.2/3/4 Buck Controller|
|Datasheet||Download ADP3157 datasheet
VCC DRIVE1 DRIVE2 PGND AGND PWRGD SENSE+ SENSE DELAY NONOVERLAP DRIVE VREF +15% 2R CROWBAR IN CMPI R gm VREF REFERENCE 1.20V VID0 SENSE R VT1 VREF +5% VREF 5%
FEATURES Active Voltage Positioning with Gain and Offset Adjustment Optimal Compensation for Superior Load Transient Response VRM 8.2, VRM 8.3 and VRM 8.4 Compliant 5-Bit Digitally Programmable 3.5 V Output Dual N-Channel Synchronous Driver Total Output Accuracy 1% Over Temperature High Efficiency, Current-Mode Operation Short Circuit Protection Overvoltage Protection Crowbar Protects Microprocessors with No Additional External Components Power Good Output SO-16 Package APPLICATIONS Desktop PC Power Supplies for: Pentium II and Pentium III Processor Families AMD-K6 Processors VRM Modules GENERAL DESCRIPTION
The is a highly efficient synchronous buck switching regulator controller optimized for converting the 5 V main supply into the core supply voltage required by the Pentium III and other high performance processors. The ADP3157 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 1.3 V and 3.5 V. The ADP3157 uses a current mode, constant off-time architecture to drive two external Nchannel MOSFETs at a programmable switching frequency that can be optimized for size and efficiency. It 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 Pentium II and Pentium III 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 ADP3157 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 15%.
Pentium is a registered trademark of Intel Corporation. All other trademarks are the property of their respective holders.
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: http://www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 1999
Parameter OUTPUT ACCURACY 1.3 V Output Voltage 2.0 V Output Voltage 3.5 V Output Voltage OUTPUT VOLTAGE LINE REGULATION INPUT DC SUPPLY CURRENT Normal Mode ShutdownILOAD 10 A (Figure 2) VIN 5.25 V VSD = +25°C, VID Pins Floating VSENSE Forced to VOUT 3%
CURRENT SENSE THRESHOLD VOLTAGE VID0VID4 THRESHOLD Low High VID0VID4 INPUT CURRENT VID0VID4 PULL-UP RESISTANCE CT PIN DISCHARGE CURRENT
VID = +25°C VOUT in Regulation VOUT 7000 pF (Drive +25°C % Above Output Voltage % Below Output Voltage 8 1.8OFF-TIME DRIVER OUTPUT TRANSITION TIME POSITIVE POWER GOOD TRIP POINT
tOFF , tF VPWRGD tPWRGD VCROWBAR ROERR gm(ERR) VCMPMIN VCMPMAX BWERR SDL SDH SDIC
NEGATIVE POWER GOOD TRIP POINT POWER GOOD RESPONSE TIME CROWBAR TRIP POINT ERROR AMPLIFIER OUTPUT IMPEDANCE ERROR AMPLIFIER TRANSCONDUCTANCE ERROR AMPLIFIER MINIMUM OUTPUT VOLTAGE ERROR AMPLIFIER MAXIMUM OUTPUT VOLTAGEVSENSE+ Forced to VOUT + 3% VSENSE+ Forced to VOUT 3% CMP = Open Part Active Part in Shutdown
ERROR AMPLIFIER BANDWIDTH 3 dB SHUTDOWN (SD) PIN Low Threshold High Threshold Input Current
NOTES 1 All limits at temperature extremes are guaranteed via correlation using standard Statistical Quality Control (SQC) methods. 2 Dynamic supply current is higher due to the gate change being delivered to the external MOSFETs. 3 The trip point is for the output voltage coming into regulation. Specifications subject to change without notice.Mnemonic VID1VID4, VID0 AGND SD SENSE SENSE+ CT CMP PWRGD VCC DRIVE2 DRIVE1 PGND
Function Voltage Identification DAC Inputs. These pins are pulled to an internal reference, providing a logic one if left open. The DAC output programs the SENSE regulation voltage from 3.5 V. Leaving all five DAC inputs open results in placing the ADP3157 into shutdown. Analog Ground. All internal signals of the ADP3157 are reference to this ground. Shutdown. A logic high will place the ADP3157 in shutdown and disable both outputs. This pin is internally pulled down. Connects to the internal resistor divider that senses the output voltage. This pin is also the input for the current comparator. The input for the current comparator. The output current is sensed as a voltage at this pin with respect to SENSE. External capacitor CT connection 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 the SENSE pins. Power Good. An open drain signal indicates that the output voltage is within ± 5% regulation band. Supply Voltage to ADP3157. Gate Drive for the (bottom) synchronous rectifier N-channel MOSFET. The voltage at DRIVE2 swings from ground to VCC. Gate Drive for the buck switch N-channel MOSFET. The voltage at DRIVE1 swings from ground to VCC. Power Ground. The drivers turn off the buck and synchronous MOSFETs by discharging their gate capacitances to this pin. PGND should have a low impedance path to the source of the synchronous MOSFET.
Input Supply Voltage (VCC). V VID0VID4, SD, PWRGD, CMP, CT. V to VCC DRIVE1, DRIVE2, SENSE+, SENSE. V to VCC Operating Ambient Temperature Range. to +70°C Junction Temperature Range. to +150°C JA. 110°C/W Storage Temperature Range. to +150°C Lead Temperature (Soldering, 10 sec). +300°C
*This is a stress rating only; operation beyond these limits can cause the device to be permanently damaged.
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 ADP3157 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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