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| RT9173/A November, 2000 3A Bus Termination Regulator General Description The RT9173/A regulator is designed to convert voltage supplies ranging from 1.8V to 6V into a desired output voltage which adjusted by two external resistors, voltage divider. The regulator is capable of sourcing or sinking up to 3A of current while regulating an output voltage to within 2% or less. The RT9173/A, 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. Features * * * * * * * * * * Power TO-263-5 Package. Capable of Sourcing and Sinking Current 3A 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 * Soft-start Function Applications * * * * Computers Disk Drives CD-ROM Supply Splitter Ordering Information RT9173/A Package type M5: TO-263-5 Operation temperature range C: Commercial standard 3A sink & source 1A sink & source Pin Configuration Part Number RT9173/ACM5 (Plastic TO-263-5) Pin Configuration Pin Name 1 VIN MARK 2 GND 3 VCNTL 4 REFEN 1234 5 5 VOUT Absolute Maximum Ratings * * * * * * Input Voltage Range Power Dissipation ESD Rating Storage Temperature Range Lead Temperature (Soldering, 5 seconds) Package Thermal Resistance TO-263 (JC) 7V Internally Limited 3KV -50C to 150C 260C 2C/W RichTek Technology Corp. 6F, No. 35, Hsintai Road, Chupei City, Hsinchu, Taiwan, R.O.C. -- 1 / 5 -- DS9173/A-00 Tel: (8863) 5510047 Fax: (8863) 5537749 RT9173/A November, 2000 Electrical Characteristics Limits in standard typeface are for TJ = 25C, unless otherwise specified: VIN = 2.5V, VCNTL = 3.3V, VREFEN = 1.25V, COUT = 10F (Ceramic) Parameter Output Offset Voltage, VOS Load Regulation, VOUT VIN Input Voltage Range VCNTL Current In Shutdown Mode, ISHDN RT9173 Peak Output Current RT9173A Short Circuit Protection RT9173 Current Limit, ICL RT9173A Over Temperature Protection Shutdown Threshold Thermal Shutdown Hysteresis Shutdown Function Shutdown threshold trigger Min. Typ. Max. Units Figure 1. -15 0 15 mV IL: -3A 3A, Figure 1. -2 0 +2 % 1.8 2.5 6 V Keep VCNTL VIN in operation power on and power off sequences 3.3 6 V VREFEN < 0.4V, RL = 10K, Figure 2. 30 60 A 1.5 3 A 3.5 5 Figure 3,4 Figure 3,4 1.5 3.5 2 4 150 50 0.8 0.4 Test Conditions A Guaranteed by design C C Output = High, Figure 5 Output = Low, Figure 5 V Function Block Diagram VCNTL VIN Current Limiting Sensor EN Thermal CNTL VOUT GND Pin Description Pin Name VIN GND VCNTL REFEN VOUT Pin Function Input Supply Ground Gate Drive Voltage Reference Voltage Input and Chip Enable Output Voltage (equals to 1/2 VIN if R1 = R2.) DS9173/A-00 Tel: (8863) 5510047 Fax: (8863) 5537749 RichTek Technology Corp. 6F, No. 35, Hsintai Road, Chupei City, Hsinchu, Taiwan, R.O.C. -- 2 / 5 -- RT9173/A Typical Applications VCNTL= 3.3V VIN = 2.5V R1 VIN REFEN EN Q1 R2 VCNTL CIN CCNTL RTT November, 2000 RT9173/A GND VOUT CSS COUT R1 = R2 = 100K, RTT = 50 / 33 / 25 COUT,min = 10F (ceramic), CSS = 1F, CIN = 100F, CCNTL = 47F Test Circuits 2.5V 3.3V VIN 1.25V REFEN VCNTL RT9173/A GND VOUT VOUT V IL COUT Figure 1: Output Voltage Tolerance, VOUT 3.3V 2.5V A VIN 1.25V 0.4V REFEN VCNTL VOUT RL VOUT V RT9173/A GND 1.25V 0V COUT RL and COUT Time delay Figure 2: Current in Shutdown Mode, Ishcln RichTek Technology Corp. 6F, No. 35, Hsintai Road, Chupei City, Hsinchu, Taiwan, R.O.C. -- 3 / 5 -- DS9173/A-00 Tel: (8863) 5510047 Fax: (8863) 5537749 RT9173/A November, 2000 2.5V 3.3V VIN 1.25V REFEN VCNTL VOUT A RT9173/A GND VOUT V IL COUT Figure 3: Current Limit for High Side, ICLHIGH Power supply with current limit 2.5V VIN 1.25V REFEN 3.3V VCNTL VOUT A IL VOUT V RT9173/A GND COUT Figure 4: Current Limit for Low Side, ICLLOW 2.5V VIN 1.25V VREFEN 0.2V REFEN 3.3V VCNTL VOUT RL VOUT V RT9173/A GND 1.25V VOUT 0V VOUT would be low if VREFEN < 0.4V VOUT would be high if VREFEN > 0.8V RL and COUT Time delay COUT Figure 5: REFEN Pin Shutdown Threshold, Vtrigger RichTek Technology Corp. 6F, No. 35, Hsintai Road, Chupei City, Hsinchu, Taiwan, R.O.C. -- 4 / 5 -- DS9173/A-00 Tel: (8863) 5510047 Fax: (8863) 5537749 RT9173/A Package Information November, 2000 D B E MARK A C L1 L2 e 12 3 4 5 b b2 Symbol D B E A C L1 L2 b b2 e Dimensions In Inches Min Norm Max 0.3921 0.0783 0.3307 0.1724 0.0465 0.1169 0.0602 0.0280 0.0110 -0.4000 0.0862 0.3386 0.1803 0.0504 0.1248 0.0681 0.0319 0.0150 0.0669 0.4079 0.0941 0.3465 0.1882 0.0543 0.1327 0.0760 0.0358 0.0189 -- Dimensions In Millimeters Min Norm Max 9.96 1.99 8.40 4.38 1.18 2.97 1.53 0.71 0.28 -10.16 2.19 8.60 4.58 1.28 3.17 1.73 0.81 0.38 1.70 10.36 2.39 8.80 4.78 1.38 3.37 1.93 0.91 0.48 -- 5-Lead TO-263 Plastic Surface Mount Package RichTek Technology Corp. 6F, No. 35, Hsintai Road, Chupei City, Hsinchu, Taiwan, R.O.C. -- 5 / 5 -- DS9173/A-00 Tel: (8863) 5510047 Fax: (8863) 5537749 |
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