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| www..com Technology Corporation AT9173 Bus Termination Regulator Release Date: Nov. 2004 Revision: V 1.2 DataSheet 4 U .com www..com Technology Corporation 1.General Description AT9173 V1.2 Bus Termination Regulator The AT9173 is a voltage regulator which could convert the input voltage ringing from 1.6V to 6V to an output voltage that user settled. The regulator can provide sourcing or sinking current.The AT9173, used in conjunction with series termination resistors, provides an excellent voltage source for active termination schemes of high speed transmission lines as those seen in high speed memory buses and distributed backplane designs. The voltage output of the regulator can be used as a termination voltage for DDR SDRAM. Current limits in both sourcing and sinking mode, plus on-chip thermal shutdown make the circuit tolerant of the output fault conditions. 2. Features Support Both DDR I (1.25VTT) and DDR II (0.9VTT) Requirements Capable of Sourcing and Sinking Current Current-limiting Protection Thermal Protection Integrated Power MOSFETs Generates Termination Voltages for SSTL-2 High Accuracy Output Voltage at Full-Load Adjustable VOUT by External Resistors Minimum External Components Shutdown for Standby or Suspend Mode Operation with High-impedance Output 3. Application DDR Memory Termination Supply Active Termination Buses Desktop PC/AGP Graphics Supply Splitter Set Top Box/IPC -1DataSheet 4 U .com www..com Technology Corporation 4. Pin Configuration Part Number AT9173-A (SOP-8) AT9173-AG (SOP-8, green device) VIN GND REFEN VOUT 1 2 3 4 AT9173 V1.2 Bus Termination Regulator Pin Configurations 8 7 6 5 VCNTL VCNTL VCNTL VCNTL AT9173-A Pin Assignment Part Number AT9173-C (PSOP-8) AT9173-CG (PSOP-8, green device) Pin Configurations VIN GND REFEN VOUT NC= 1 2 3 4 No internal connection 8 7 6 5 NC NC VCNTL NC = Thermal Pad (Connected to GND plane for better heat dissipation), The Pad of dimension is 0.090 x 0.090 (Inch) AT9173-C Pin Assignment -2DataSheet 4 U .com www..com Technology Corporation 5. Pin Description Pin name VIN GND VCNTL REFEN VOUT Power Input Ground Driving Voltage Input voltage reference & chip enable Output Voltage AT9173 V1.2 Bus Termination Regulator Description 6. Block Diagram VCNTL VIN Thermal Sensor Thermal + - VOUT VCNTL & Over Current REFEN Protection circuit + - GND Fig 1 : Block Diagram -3DataSheet 4 U .com www..com Technology Corporation 7. Application Circuit DDR_2.5V 1 R2 100K R4 100K C8 4.7u C4 0.1u C2 470u 2 3 4 AT9173-A-SOP-8 8 7 6 5 VCC_3V AT9173 V1.2 Bus Termination Regulator VIN GND REF VOUT VCNT VCNT VCNT VCNT DDR_VTT 1.25V/1.5A C6 470u AT9173-A SOP-8 Fig 2 : Application Circuit AT9173-A DDR_2.5V 1 R1 100K R3 100K C3 0.1u C4 470u 2 3 4 AT9173-C-PSOP-8 VCC_3V VIN GND GND_PAD REF VOUT NC NC VCNT NC 8 7 6 5 DDR_VTT 1.25V/2A C7 4.7u C5 470u AT9173-C PSOP-8 Fig 3 : Application Circuit AT9173-C -4DataSheet 4 U .com www..com Technology Corporation 8-1. Absolute Maximum Ratings Symbol VIN PD VESD TSTG TL Power Dissipation ESD Rating (Human Body Mode) Storage Temperature Lead Temperature (Soldering, 5 sec) Parameter Input Voltage, VIN to GND AT9173 V1.2 Bus Termination Regulator Rating 6 Internally Limit 2 150 245 Unit V W KV 8-2. Thermal Characteristics Symbol JC Parameter Thermal Resistance In Case SOP-8 PSOP-8 25.7 12 /W Rating Unit 8-3. Recommended Operating Conditions Symbol VIN VCNT REFEN *IOUT TJ VIN Supply Voltage VCNT Supply Voltage Reference Voltage Input VOUT Output Current* Junction Temperature Parameter Rating 1.8~3.3 3.3 0.9/1.25 -2 ~ +2 -25~125 Unit V V V A *The symbol "+" means the VOUT sources current to load; the symbol "-" means the VOUT sinks current to GND -5DataSheet 4 U .com www..com Technology Corporation 8-4. Electrical Characteristics AT9173 V1.2 Bus Termination Regulator Limits in standard typeface are for TA=25 , unless otherwise specified: VIN=2.5V, VCNTL=3.3V, VREFEN=0.5VIN, Parameter Output Offset Voltage Load Regulation (DDR 1/2) Input Voltage Range (DDR 1/2) Operating Current of VCNTL Current In Shutdown Mode Symbol VOS VLOAD VIN VCNTL ICNTL ISHDN Test Conditions IOUT=0A (Note1) IL=0~1.5A Fig 4 IL=0~-1.5A KEEP VCNTL power off No Load VREFEN 0.2V, RL=180 Fig 5 VIN on operation power on and Min -20 -20 -20 1.6 2.5 Typ 0 0 0 2.5/1.8 3.3 1.4 25.6 Max 20 20 20 4 6 Units mV mV V mA A Short Circuit Protection SOP-8 Current Limit PSOP-8 Current Limit ILIMIT ILIMIT Fig 6,7 Fig 6,7 2.1 2.4 A A Over Temperature Protection Thermal Shutdown Temperature Thermal Shutdown Hysteresis TSD 3.3V VCNTL 5V 125 Guaranteed by design 30 Note1: VOS offset is the voltage measurement defined as VOUT subtracted from VREFEN. -6DataSheet 4 U .com www..com Technology Corporation 8-5. Test Circuit AT9173 V1.2 Bus Termination Regulator Figure 4: Output Voltage Tolerance, VOUT Figure 5: Current in Shutdown Mode, ISHCLN -7DataSheet 4 U .com www..com Technology Corporation AT9173 V1.2 Bus Termination Regulator Figure 6: Current Limit for High Side, ICLHIGH Figure 7: Current Limit for Low Side, ICLLOW -8DataSheet 4 U .com www..com Technology Corporation 9. Typical Characteristics AT9173 V1.2 Bus Termination Regulator -9DataSheet 4 U .com www..com Technology Corporation 10. Operation Waveforms 10-1. Load Transient Response: IOUT = + 0A VIN=2.5V, VCNTL=3.3V VREF is 1.25V supplied by a regulator COUT=1000uF/35V IOUT slew rate = +-0.8A/uS +0A +1.5A +0A AT9173 V1.2 Bus Termination Regulator +1.5A +0A +1.5A +0A +1.5A +0A Ch1= IOUT Ch2= VOUT Ch1= IOUT Ch2= VOUT Table 6: Load Transient Response Ch1= IOUT Ch2= VOUT 10-2. Load Transient Response: IOUT = +0A VIN=2.5V, VCNTL=3.3V VREF is 1.25V supplied by a regulator COUT=1000uF/35V IOUT slew rate = +-0.8A/uS +0A +2A +0A +2A +0A +2A +0A +2A +0A Ch1= IOUT Ch2= VOUT Ch1= IOUT Ch2= VOUT Table 7: Load Transient Response - 10 - Ch1= IOUT Ch2= VOUT DataSheet 4 U .com www..com Technology Corporation 10-3. Load Transient Response: IOUT = +0A VIN=2.5V, VCNTL=3.3V VREF is 1.25V supplied by a regulator COUT=1000uF/35V IOUT slew rate = +-0.8A/uS +0A +3A +0A AT9173 V1.2 Bus Termination Regulator +3A +0A +3A +0A +3A +0A Ch1= IOUT Ch2= VOUT Ch1= IOUT Ch2= VOUT Table 8: Load Transient Response Ch1= IOUT Ch2= VOUT 10-4. Load Transient Response: IOUT = - 0A IN=2.5V, -1.5A -0A VCNTL=3.3V VREF is 1.25V supplied by a regulator COUT=1000uF/35V IOUT slew rate = +-0.8A/uS -0A -1.5A -0A -1.5A -0A -1.5A -0A Ch1= IOUT Ch2= VOUT Ch1= IOUT Ch2= VOUT Table 9: Load Transient Response Ch1= IOUT Ch2= VOUT - 11 DataSheet 4 U .com www..com Technology Corporation 10-5. Load Transient Response: IOUT = -0A VIN=2.5V, VCNTL=3.3V VREF is 1.25V supplied by a regulator COUT=1000uF/35V IOUT slew rate = +-0.8A/uS -0A -2A -0A AT9173 V1.2 Bus Termination Regulator -2A -0A -2A -0A -2A -0A Ch1= IOUT Ch2= VOUT Ch1= IOUT Ch2= VOUT Table 10: Load Transient Response Ch1= IOUT Ch2= VOUT 10-6. Load Transient Response: IOUT = -0A VIN=2.5V, VCNTL=3.3V VREF is 1.25V supplied by a regulator COUT=1000uF/35V IOUT slew rate = +-0.8A/uS -0A -3A -0A -3A -0A -3A -0A -3A -0A Ch1= IOUT Ch2= VOUT Ch1= IOUT Ch2= VOUT Table 11: Load Transient Response Ch1= IOUT Ch2= VOUT - 12 DataSheet 4 U .com www..com Technology Corporation 11-1. SOP-8/PSOP-8 package Information AT9173 V1.2 Bus Termination Regulator 0.10MM C Symbol A A1 B C e D H E L h JEDEC Dimension in mm Min 1.35 0.10 0.33 0.19 1.27BSC 4.80 5.80 3.80 0.40 0.25 0 0 Dimension in inch Min 0.0532 0.0040 0.013 0.0075 0.1890 0.2284 0.1497 0.016 0.0099 0 0 Max 1.75 0.25 0.51 0.25 5.00 6.20 4.00 1.27 0.50 8 0 Max 0.0688 0.0098 0.020 0.0098 0.050BSC 0.1968 0.2440 0.1574 0.050 0.0196 8 0 MS-012 (AA) *NOTES: DIMENSION "D" DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH, PROTRUSIONS AND GATE BURRS SHALL NOT EXCEED 0.15 MM (0.006 INCH) PER SIDE. - 13 DataSheet 4 U .com www..com Technology Corporation Copyright (c) 2004 Attansic Technology Corp. AT9173 V1.2 Bus Termination Regulator The materials contained in this document replace all previous documentation issued for the related products included herein. Please contact Attansic Technology Corp. for the latest documents. Attansic is the trademark of Attansic Technology Corp. All specifications are subject to change without notice. Additional copies of this document or other Attansic literatures may be obtained from: 3FL., No. 147, Hsien Cheng 9th Rd., Chu-Pei, Hsin-Chu Hsien, Taiwan Tel: 886-3-5545660 Fax: 886-3-5545661 To find out more about Attansic, visit our World Wide Web address at: http://www.attansic.com/ - 14 DataSheet 4 U .com |
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