Advanced ® SP2996B 2A Bus Termination Regulator VIN 1 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 8 VCNTL 7 VCNTL REFEN 3 6 VCNTL VOUT 4 5 VCNTL SP2996B GND 2 8 Pin nSOIC 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 100kΩ VOUT VREF CES7002A EN CCNTL 47µF ® 3 R2 100kΩ CIN 470µF VCNTL SP2996B C1 GND 100pF 4 VOUT COUT 220µF 2 Date: 07/7/05 SP2996B 2A Termination Regulator 1 © Copyright 2005 Sipex Corporation ABSOLUTE MAXIMUM RATINGS Supply Voltage ................................................... -0.4V to 7V Operating Temperature Range.......................-40°C to +85°C Junction Temperature ............. ..................................125°C Storage Temperature Range........................-65°C to +150°C ELECTRICAL CHARACTERISTICS VIN = 2.5V, VCTRL = 3.3V, VREF = 0.5VIN, COUT = 10µF (Ceramic), TA = 25ºC, unless otherwise specified. (Note 1) Parameter Test Conditions Min Typ Max Keep V CTRL ≥ VIN on operation power on and power off sequences 1.6 2.5/1.8 - V CNTL IOUT = 0mA 3.0 3.3 6 Output Voltage V OUT IOUT = 0mA Output Offset Voltage VOS No Load Input Voltage Range (DDR 1/2) (Note 5) Load Regulation (DDR 1/2) Quiescent Current Operating Current of VCNTL Symbol VIN ICNTL Bias Current of VREF Current Limit V VREF V -20 - 20 IOUT = 0.1mA to +2A - 10 25 IOUT = 0.1mA to -2A - 10 25 IIL mV VREF < 0.2V, VOUT = OFF - 8 30 µA No Load - 3 10 mA VREF = 1.25V - - 1 µA Note 4 2.2 3 4.5 A 3.3V ≤ VCNTL ≤ 5V Guaranteed by design 125 150 - ºC Guaranteed by design - 30 - ºC mV ∆ V LOR IQ Units Thermal Protection Thermal Shutdown Temperature (Note 5) TSD Thermal Shutdown Hysteresis Shutdown Specifications Shutdown Threshold VTRIGGER Output ON ( V REF = ZeroV ---->1 .25V) 0.8 - - Shutdown Threshold VTRIGGER Output OFF ( V REF = 1.25V ----> ZeroV) - - 0.2 V Note 1 . Specifications are tested for production at TA = 25ºC . Specifications over the -40ºC to 85ºC 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 2 © Copyright 2005 Sipex Corporation PIN DESCRIPTIONS Pin Name Pin Number Description (8 pin NSOIC) VIN 1 Power Input Voltage GND 2 Ground REFEN 3 Reference Voltage Input V OUT 4 Output Voltage V CNTL 5 Voltage for the driver circuit and all analog blocks V CNTL 6 Voltage for the driver circuit and all analog blocks V CNTL 7 Voltage for the driver circuit and all analog blocks V CNTL 8 Voltage for the driver circuit and all analog blocks BLOCK DIAGRAM Date: 07/7/05 SP2996B 2A Termination Regulator 3 © Copyright 2005 Sipex Corporation TEST CIRCUITS 2.5V 3.3V VIN 1.25V VCNTL VOUT VOUT REFEN GND COUT V IL Figure 1. Output Voltage Tolerance, ∆VLOAD 2.5V 3.3V A VIN 1.25V ZeroV VCNTL 1.25V VOUT VOUT REFEN 0V GND RL COUT V RL & COUT Time Delay Figure 2. Current in Shutdown Mode, ISHDN Date: 07/07/05 SP2996B 2A Termination Regulator 4 © Copyright 2005 Sipex Corporation TEST CIRCUITS 2.5V 3.3V VIN VCNTL VOUT 1.25V VOUT REFEN GND A COUT V IL Figure 3. Current Limit for High Side, ILIMIT Power Supply with Current Limit 3.3V 2.5V A VIN VCNTL IL VOUT 1.25V VOUT REFEN GND COUT V Figure 4. Current Limit for Low Side, ILIMIT Date: 07/7/05 SP2996B 2A Termination Regulator 5 © Copyright 2005 Sipex Corporation TEST CIRCUITS 3.3V 2.5V A VIN VREFEN 1.25V VCNTL 0.8V Shutdown Threshold VOUT VOUT REFEN 0.2V GND RL VOUT 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 6 © Copyright 2005 Sipex Corporation TYPICAL PERFORMANCE CHARACTERISTICS Turn-on Threshold Vs. Temperature Turn-On Threshold vs. Temperature 520 Threshold Voltage (mV) Threshold Voltage (mV) 520 480 440 400 VCTRL = 3.3V Vin = 2.5V 360 320 -40 -20 0 20 40 60 Temperture 80 100 480 440 400 320 -40 120 -20 0 20 40 60 80 4 4.0 Current (A) 5.0 Sourcing 3 2 VCTRL = 3.3V Vin = 2.5V 1 3.0 2.0 VCTRL = 5V Vin = 2.5V 1.0 Vout = 1.25V Vout = 1.25V 0.0 -40 0 -20 0 20 40 60 Temperature 120 Sourcing Current (Peak) vs. Temperature 5 -40 100 Temperature ºC ºC Sinking Current (Peak) vs. Temperature Sinking Current (A) VCTRL = 3.3V Vin = 2.5V 360 80 100 120 -20 0 20 40 Temperature ºC 60 80 100 120 ºC Output Voltage Offset vs. Temperature 4.50 (mV) 3.00 Output Voltage 3.50 Offset 4.00 2.50 2.00 VCTRL = 5V 1.50 Vin = 2.5V 1.00 0.50 -40 Vout = 1.25V -20 0 20 40 Temperature Date: 07/7/05 60 80 100 120 (ºC) SP2996B 2A Termination Regulator 7 © Copyright 2005 Sipex Corporation 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 8 © Copyright 2005 Sipex Corporation PACKAGE: 8 PIN NSOIC D Ø e E/2 E1/2 E1 L2 E Seating Plane L1 1 Ø L Ø1 Gauge Plane VIEW C b INDEX AREA (D/2 X E1/2) TOP VIEW b A2 A Seating Plane A1 c 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 ø 0º 8º ø1 5º 15º 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 ø 0º 8º ø1 5º 15º Note: Dimensions in (mm) Controlling Dimension Date: 07/7/05 Note: Dimensions in (inches) Conversion Factor: 1 Inch = 25.40 mm SP2996B 2A Termination Regulator 9 © Copyright 2005 Sipex Corporation ORDERING INFORMATION PART NUMBER TEMPERATURE RANGE PACKAGE SP2996BEN ........ ............................................................... -40ºC to 85ºC....................................................8 Lead NSOIC SP2996BEN /TR . ............................................................... -40ºC to 85ºC................................................... 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 10 © Copyright 2005 Sipex Corporation