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| AIC1383 1.5A Termination Regulator FEATURES 1.5A Source and Sink Current Ability Support DDR1 (1.25VTT) and DDR2 (0.9VTT) Requirements Low Output Voltage Offset, 20mV High Accuracy Output Voltage at Full-Load Adjustable VOUT by External Resistor Low External Component Count Current Limit protection Thermal Protection SOP-8 Package DESCRIPTION AIC1383 linear regulator is designed to achieve 1.5A source and sink current while regulating an output voltage to within 25mV. AIC1383 converts voltage supplies range from 1.6V to 6V into an output voltage that adjusts by two external voltage divider resistors. It provides an excellent voltage source for active termination schemes of high-speed transmission lines as those seen in high-speed memory buses, and it meets the JEDEC SSTL2 and SSTL-3 specifications for termination of DDR-SRAM. Built-in current limiting in source and sink mode, with thermal shutdown provide maximal protection to the AIC1383 against fault conditions. APPLICATIONS Mother Board Graphic Cards DDR Termination Voltage Supply TYPICAL APPLICATION CIRCUIT 1 + R1 100K 2 3 EN CES7002A C1 R2 100pF 100K VOUT=1.25V + 4 8 VIN=2.5V CIN 470F VIN GND VREF VOUT VCNTL VCNTL VCNTL VCNTL + 7 6 5 CCNTL 47F VCNTL=3.3V COUT 220F AIC1383 Analog Integrations Corporation Si-Soft Research Center 3A1, No.1, Li-Hsin Rd. I, Science Park, Hsinchu 300, Taiwan, R.O.C. TEL: 886-3-5772500 FAX: 886-3-5772510 www.analog.com.tw DS-1383P-02 010405 1 AIC1383 ORDERING INFORMATION AIC1383XXXX PACKING TYPE TR: TAPE & REEL PACKAGE TYPE S: SOP-8 C: COMMERCIAL P: LEAD FREE COMMERCIAL Example: AIC1383CSTR 1.5A Version, in SOP-8 Package, Tape & Reel Packing Type AIC1383PSTR 1.5A Version, in Lead Free SOP-8 Package, Tape & Reel Packing Type VIN 1 GND 2 VREF 3 VOUT 4 8 7 6 5 VCNTL VCNTL VCNTL VCNTL PIN CONFIGURATION SOP-8 TOP VIEW ABSOLUTE MAXIMUM RATINGS Supply Voltage Operating Temperature Range Junction Temperature Range Storage Temperature Range Lead Temperature (Solder, 10sec) Thermal Resistance JC Thermal Resistance JA SO-8 SO-8 -0.4V to 7V -40C~85C 125C -65C ~150C 260C 40C /W 160C /W (Assume no ambient airflow, no heatsink) Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. TEST CIRCUIT 2.5V/ 1.8V 1 VIN VCNTL VCNTL VCNTL VCNTL 8 7 6 5 3.3V 2 GND 3 VREF 4 VOUT 1.25V /0.9V VOUT + COUT 10F AIC1383 2 AIC1383 ELECTRICAL CHARACTERISTICS (VCNTL=3.3V, VIN=2.5V, VREF=0.5VIN, COUT=10F, TA=25C, unless otherwise specified) (Note 1) PARAMETER Input Voltage (DDR1/2) Output Voltage Output Voltage Offset Load Regulation (DDR1/2) Quiescent Current TEST CONDITIONS Keep operate VCNTLVIN at power on and off sequences IOUT = 0mA IOUT = 0mA IOUT =0.1mA ~ +1.5A IOUT = 0.1mA ~ -1.5A VREF<0.2V, VOUT = OFF SYMBOL VIN VCNTL VOUT VOS VLOR IQ ICNTL -20 10 10 8 3 MIN. 1.6 3.0 TYP. 2.5/1.8 3.3 VREF 20 25 25 30 10 1 IIL 2.1 3 4.5 6 MAX. UNIT V V mV mV A mA A A Operating Current of VCNTL No load VREF Bias Current Current Limit THERMAL PROTECTION Thermal Shutdown Temperature Thermal Shutdown Hysteresis 3.3VVCNTL5V Guaranteed by design VREF=1.25V TSD 125 150 30 C C SHUTDOWN SPECIFICATIONS Shutdown Threshold Output ON (VREF=0V 1.25V) Output OFF (VREF=1.25V 0V) 0.8 0.2 V Note 1: Specifications are production tested 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 is the voltage measurement, which is defined as VOUT subtracted 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: For operate system safely; VCNTL must be always greater than VIN. 3 AIC1383 TYPICAL PERFORMANCE CHARACTERISTICS 0.55 0.55 VCNTL=3.3V Threshold Voltage (V) Threshold Voltage (V) 0.50 VCNTL=5V 0.50 VIN=2.5V VIN=2.5V 0.45 0.45 0.40 0.40 0.35 0.35 0.30 -40 -20 0 Temperature (C) 20 40 60 80 100 120 0.30 -40 -20 0 20 40 60 80 100 120 Fig. 1 Turn-On Threshold vs. Temp. Temperature (C) Fig. 2 Turn-On Threshold vs. Temp 3.0 2.5 VCNTL=3.3V, VIN=2.5V V CNTL=3.3V VOUT=1.25V 5 Output Voltage Offset (mV) 2.0 Sourcing Current (A) VIN=2.5V VREF=1.25V No Load 4 3 1.5 2 1.0 VCNTL=3.3V 1 0.5 VIN=2.5V VOUT=1.25V 0.0 -40 -20 0 20 40 o 60 80 100 120 0 -40 -20 0 20 40 60 80 100 120 Temperature( C) Fig. 3 Output Voltage Offset vs. Temperature Temperature (C) Fig. 4 Current-Limit (Sourcing) vs. Temperature 5 4 Sinking Current (A) V CNTL=3.3V VIN=2.5V VOUT=1.25V 3 2 1 0 -40 -20 0 20 40 60 80 100 120 Temperature (C) Fig. 5 Current-Limit (Sinking) vs. Temperature 4 AIC1383 TYPICAL PERFORMANCE CHARACTERISTICS VIN=2.5V VCNTL=3.3V VREF=1.25V VIN=2.5V VCNTL=3.3V VREF=1.25V (Continued) IOUT : 1A/DIV IOUT : 1A/DIV Fig. 6 Output Short-Circuit (Sinking) Fig. 7 Output Short-Circuit Protection (Sourcing) VOUT: 50mV/DIV VIN=2.5V VCNTL=3.3V VREF=1.25V VOUT: 50mV/DIV VIN=1.8V VCNTL=3.3V VREF=0.9V IOUT : 1A/DIV IOUT : 1A/DIV Fig. 8 Transient Response at 1.25VTT/1.5A Fig. 9 Transient Response at 0.9VTT/1.5A BLOCK DIAGRAM VCNTL VIN + Control VREF VOUT Current Limit Thermal Shutdown VOUT Shutdown GND 5 AIC1383 PIN DESCRIPTIONS PIN 1: - Input supply pin. It provides main power to create the external reference voltage by divider resistors for regulating VREF and VOUT. GND - Ground pin. VREF - Reference voltage input. Pull this pin low to shutdown device. VIN PIN 4: VOUT - Output pin. PIN 5~8: VCNTL - Input supply pin. It is used to supply all the internal control circuitry. PIN 2: PIN 3: APPLICATION INFORMATION Layout Consideration AIC1383 is in SOP-8 package resulting in unable to dissipate heat easily when it operates in high current. In order to prevent maximum junction temperature exceeded, the suitable copper area has to use. The large copper at VCNTL pins is available, and the heat dissipation is relieved. Using via to lead heat into the bottom layer to strengthen as below figures show. All capacitors should be placed as close as possible to relative pins. Fig. 10. Top layer Fig. 11. Bottom layer Fig. 12. Placement 6 AIC1383 PHYSICAL DIMENSIONS (unit: mm) SOP-8 D S Y M B O L SOP-8 MILLIMETERS MIN. 1.35 0.10 0.33 0.19 4.80 3.80 1.27 BSC 5.80 0.25 0.40 0 6.20 0.50 1.27 8 MAX. 1.75 0.25 0.51 0.25 5.00 4.00 H E A A1 B C h X 45 A A D SEE VIEW B e E e H h L A B A1 WITH PLATING BASE METAL C 0.25 L VIEW B GAUGE PLANE SEATING PLANE Note: Information provided by AIC is believed to be accurate and reliable. However, we cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an AIC product; nor for any infringement of patents or other rights of third parties that may result from its use. We reserve the right to change the circuitry and specifications without notice. Life Support Policy: AIC does not authorize any AIC product for use in life support devices and/or systems. Life support devices or systems are devices or systems which, (I) are intended for surgical implant into the body or (ii) support or sustain life, and whose failure to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 7 |
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