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| (R) Advanced SP2996B 2A Bus Termination Regulator FEATURES Capable of sourcing and sinking 2A Continuous current Supports both DDR1 (1.25VTT) and DDR2 (0.9VTT) requirements Low Output Voltage Offset, + 20mV Thermal and Current Limit Protection Integrated Power MOSFETs Generates Termination for SSTL-2 High Accuracy Output at Full Load Adjustable VOUT by External Resistors Minimal External Components Available in 8 pin NSOIC package VIN 1 GND 2 8 VCNTL VCNTL SP2996B 8 Pin nSOIC 7 REFEN 3 VOUT 4 6 5 VCNTL VCNTL Now Available in Lead Free Packaging APPLICATIONS DDR Memory Termination Active Bus Termination Supply Splitter DESCRIPTION The SP2996B voltage regulator is designed to convert voltage supplies ranging from 1.6V to 6V into a desired output voltage which is adjusted by an external resistor divider. The regulator is capable of sourcing or sinking up to 2A of Continuous current while regulating an output voltage to within 20mV. The SP2996B provides an excellent voltage source for active termination schemes of high speed transmission lines such as those seen in high speed memory buses and distributed backplane designs when used in conjunction with series termination resistors. The voltage output of the regulator can be used as a termination voltage for DDR SDRAM, and it meets the JEDEC SSTL-2 and SSTL-3 specifications . Current limits in both sourcing and sinking mode, plus on-chip thermal shutdown make the circuit tolerant of output fault conditions. TYPICAL APPLICATIONS CIRCUIT VCNTL= 3.3V VIN= 2.5V 1 5,6,7,8 VIN R1 100k 3 VCNTL (R) CIN 470F 4 CCNTL 47F VREF SP2996B GND 2 CES7002A EN R2 100k C1 100pF VOUT VOUT COUT 220F Date: 07/7/05 SP2996B 2A Termination Regulator (c) Copyright 2005 Sipex Corporation 1 ABSOLUTE MAXIMUM RATINGS Supply Voltage ................................................... -0.4V to 7V Operating Temperature Range.......................-40C to +85C Junction Temperature ............. ..................................125C Storage Temperature Range........................-65C to +150C ELECTRICAL CHARACTERISTICS VIN = 2.5V, VCTRL = 3.3V, VREF = 0.5VIN, COUT = 10F (Ceramic), TA = 25C, unless otherwise specified. (Note 1) Parameter Symbol VIN Test Conditions Keep V CTRL VIN on operation power on and power off sequences IOUT = 0mA IOUT = 0mA No Load IOUT = 0.1mA to +2A V LOR IOUT = 0.1mA to -2A IQ ICNTL VREF < 0.2V, VOUT = OFF No Load 10 8 3 25 30 10 A mA -20 Min 1.6 Typ 2.5/1.8 Max V 3.0 3.3 VREF 10 20 25 mV 6 V mV Units Input Voltage Range (DDR 1/2) (Note 5) V CNTL Output Voltage Output Offset Voltage V OUT VOS Load Regulation (DDR 1/2) Quiescent Current Operating Current of VCNTL Bias Current of VREF VREF = 1.25V - - 1 A Current Limit Thermal Protection Thermal Shutdown Temperature (Note 5) Thermal Shutdown Hysteresis Shutdown Specifications Shutdown Threshold Shutdown Threshold IIL Note 4 2.2 3 4.5 A TSD 3.3V VCNTL 5V Guaranteed by design Guaranteed by design 125 - 150 30 - C C VTRIGGER VTRIGGER Output ON ( V REF = ZeroV ---->1 .25V) Output OFF ( V REF = 1.25V ----> ZeroV) 0.8 - - V 0.2 Note 1 . Specifications are tested for production at TA = 25C . Specifications over the -40C to 85C operating temperature range are assured by design, characterization and correlation with Statistical Quality Controls (SQC). Note 2. VOS offset is the voltage measurement defined as VOUT subtracted from VREF. Note 3. Load regulation is measured at constant junction temperature, using pulse testing with a low ON time. Note 4. Current limit is measured by pulsing a short time. Note 5. In order to safely operate your system, VCTRL must be > VIN. Date: 07/07/05 SP2996B 2A Termination Regulator (c) Copyright 2005 Sipex Corporation 2 PIN DESCRIPTIONS Pin Name VIN GND REFEN V OUT V CNTL V CNTL V CNTL V CNTL Pin Number 1 2 3 4 5 6 7 8 Description (8 pin NSOIC) Power Input Voltage Ground Reference Voltage Input Output Voltage Voltage for the driver circuit and all analog blocks Voltage for the driver circuit and all analog blocks Voltage for the driver circuit and all analog blocks Voltage for the driver circuit and all analog blocks BLOCK DIAGRAM Date: 07/7/05 SP2996B 2A Termination Regulator (c) Copyright 2005 Sipex Corporation 3 TEST CIRCUITS 2.5V VIN REFEN 3.3V VCNTL VOUT VOUT 1.25V GND COUT IL V Figure 1. Output Voltage Tolerance, VLOAD 2.5V 3.3V A VIN VCNTL VOUT VOUT 1.25V 1.25V REFEN ZeroV GND RL COUT V 0V RL & COUT Time Delay Figure 2. Current in Shutdown Mode, ISHDN Date: 07/07/05 SP2996B 2A Termination Regulator (c) Copyright 2005 Sipex Corporation 4 TEST CIRCUITS 2.5V VIN REFEN 3.3V VCNTL VOUT 1.25V VOUT GND A IL COUT V Figure 3. Current Limit for High Side, ILIMIT Power Supply with Current Limit 2.5V VIN REFEN 3.3V A VCNTL VOUT IL VOUT 1.25V GND COUT V Figure 4. Current Limit for Low Side, ILIMIT Date: 07/7/05 SP2996B 2A Termination Regulator (c) Copyright 2005 Sipex Corporation 5 TEST CIRCUITS 2.5V 3.3V A VIN VCNTL VOUT VOUT VREFEN 1.25V 0.8V Shutdown Threshold REFEN 0.2V GND VOUT RL COUT V VOUT goes low for VREFEN < 0.2V VOUT goes low for VREFEN > 0.8V Figure 5. REFEN Pin Shutdown Threshold, , VTRIGGER Date: 07/07/05 SP2996B 2A Termination Regulator (c) Copyright 2005 Sipex Corporation 6 TYPICAL PERFORMANCE CHARACTERISTICS Turn-on Threshold Vs. Temperature 520 520 Turn-On Threshold vs. Temperature 480 Threshold Voltage (mV) Threshold Voltage (mV) 480 440 440 400 400 360 VCTRL = 3.3V Vin = 2.5V 360 VCTRL = 3.3V Vin = 2.5V 320 -40 -20 0 20 40 Temperture C 60 80 100 120 320 -40 -20 0 20 40 60 80 100 120 Temperature C Sinking Current (Peak) vs. Temperature 5 Sourcing Current (Peak) vs. Temperature 5.0 Sinking Current (A) Current Sourcing (A) 4 4.0 3 3.0 2 2.0 VCTRL = 3.3V 1 VCTRL = 5V Vin = 2.5V Vout = 1.25V Vin = 2.5V Vout = 1.25V 1.0 0 -40 -20 0 20 40 60 C 80 100 120 Temperature 0.0 -40 -20 0 20 40 60 C 80 100 120 Temperature Output Voltage Offset vs. Temperature 4.50 4.00 (mV) Offset Voltage Output 3.50 3.00 2.50 2.00 1.50 1.00 0.50 -40 VCTRL = 5V Vin = 2.5V Vout = 1.25V -20 0 20 40 60 80 100 120 Temperature (C) Date: 07/7/05 SP2996B 2A Termination Regulator (c) Copyright 2005 Sipex Corporation 7 APPLICATION INFORMATION Internal parasitic diode Avoid forward-biasing the internal parasitic diode, VOUT to VCNTL, and VOUT to VIN. Positive voltage should not be applied to the output if VIN and VCNTL are not present. Considerations for designing, resistance of voltage divider When the reference voltage is programmed below 0.2V the pulldown capability of the internal NMOS transistor is limited. It is recommened to place a filter capacitor from VRE to ground in order to reduce sensitivity to noise and improve power up characteristics (soft start). Date: 07/07/05 SP2996B 2A Termination Regulator (c) Copyright 2005 Sipex Corporation 8 PACKAGE: 8 PIN NSOIC D e O E/2 E1/2 E1 L2 E Seating Plane O1 L1 1 L Gauge Plane O b VIEW C INDEX AREA (D/2 X E1/2) TOP VIEW b A A2 Seating Plane c A1 SIDE VIEW BASE METAL SECTION B-B WITH PLATING B B SEE VIEW C 8 Pin NSOIC JEDEC MS-012 (AA) Variation SYMBOL MIN NOM MAX A 1.35 1.75 A1 0.10 0.25 A2 1.25 1.65 b 0.31 0.51 c 0.17 0.25 D 4.90 BSC E 6.00 BSC E1 3.90 BSC e 1.27 BSC L 0.40 1.27 L1 1.04 REF L2 0.25 BSC o 0 8 o1 5 15 Note: Dimensions in (mm) Controlling Dimension 8 Pin NSOIC JEDEC MS-012 (AA) Variation MIN NOM MAX SYMBOL A 0.053 0.069 A1 0.004 0.010 A2 0.049 0.065 b 0.012 0.020 c 0.007 0.010 D 0.193 BSC E 0.236 BSC E1 0.154 BSC e 0.050 BSC L 0.016 0.050 L1 0.04 REF L2 0.010 BSC o 0 8 o1 5 15 Note: Dimensions in (inches) Conversion Factor: 1 Inch = 25.40 mm Date: 07/7/05 SP2996B 2A Termination Regulator (c) Copyright 2005 Sipex Corporation 9 ORDERING INFORMATION PART NUMBER TEMPERATURE RANGE PACKAGE SP2996BEN ........ ............................................................... -40C to 85C....................................................8 Lead NSOIC SP2996BEN /TR . ............................................................... -40C to 85C................................................... 8 Lead NSOIC Available in lead free packaging. To order add "-L" suffix to part number. Example: SP2996BEN/TR = standard; SP2996BEN-L-/TR = lead free. /TR = Tape and Reel Pack quantity is 2,500 NSOIC. Corporation ANALOG EXCELLENCE Sipex Corporation Headquarters 233 South Hillview Drive Milpitas, CA 95035 TEL: (408) 934-7500 FAX: (408) 935-7600m Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others. Date: 07/07/05 SP2996B 2A Termination Regulator (c) Copyright 2005 Sipex Corporation 10 |
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