CM8563 1.5A LINEAR BUS TERMINATION REGULATOR GENERAL DESCRIPTION FEATURES The CM8563 is a low cost linear regulator designed to provide a desired output voltage or termination voltage for various applications. The device contains a high-speed operational amplifier to provide excellent response to load transients. The CM8563 is capable of sourcing or sinking up to 1.5A, and peaks up to 3A of current while regulating an output VOUT voltage to meet the JEDEC SSTL-2 and SSTL-3 specification. . Ideal for DDR-I and DDR-II 8-pin SOIC package Source and sink up to 1.5A, no heat sink required Integrated power MOSFETs No external resistors required Minimum external components The CM8563 also incorporates a VFB pin to provide superior load regulation and a VREF output as a reference for the chipset and DDR DIMMS. The CM8563 provides low profile 8-pin SOIC package to save system space. APPLICATIONS PIN CONFIGURATION SOP-8 (S08) Top View Mother Board PCI/AGP Graphics DDR Termination Voltage (SSTL-2 & SSTL-3) 1 PG VOUT 8 2 GND VIN 7 3 VFB VCCA 6 4 VREF VDDQ 5 TYPICAL APPLICATION VREF = 1.25V U1 PG VDDQ = 2.5V 0.1uF CM8563 PG VREF VDDQ VOUT VOUT = 1.25V 220uF VCCA = 2.5V VCCA VIN VFB GND 50uF 2003/03/28 Champion Microelectronic Corporation Page 1 CM8563 1.5A LINEAR BUS TERMINATION REGULATOR PIN DESCRIPTION Pin No. Symbol Description 1 PG Power Good 2 GND Ground 3 VFB Feedback pin for regulating VOUT 4 VREF Buffered reference Voltage 5 VDDQ Input for internal reference equal to VDDQ/2 6 VCCA Analog input 7 VIN Power input 8 VOUT Output voltage for connection to termination resistors ORDERING INFORMATION Part Number Temperature Range Package CM8563IS -40℃ to 85℃ 8-Pin SOP (S08) CM8563PIS -40℃ to 85℃ 8-Pin PSOP (PS08) BLOCK DIAGRAM VIN VDDQ VCCA 7 5 6 270k + VREF + - 4 - 8 VOUT 3 VFB 270k PG 1 Power Good 2 GND 2003/03/28 Champion Microelectronic Corporation Page 2 CM8563 1.5A LINEAR BUS TERMINATION REGULATOR APPLICATION CIRCUITS U1 PG VDDQ CM8563 PG VREF VDDQ VOUT VREF VOUT COUT VCCA VCCA VFB VIN GND CIN Application Circuit for Bus Termination U1 PG VDDQ CM8563 PG VREF VDDQ VOUT VREF VOUT R1 VCCA VCCA COUT VFB R1 VIN GND CIN Application Circuit for Adjustable Output Voltage 2003/03/28 Champion Microelectronic Corporation Page 3 CM8563 1.5A LINEAR BUS TERMINATION REGULATOR ABSOLUTE MAXIMUM RATINGS Absolute maximum ratings are those values beyond which the device could be permanently damaged. VIN, VCCA, VDDQ to GND ......................….……... –0.3V to 6V Storage Temperature Lead Temperature (Soldering, 5 sec)……………….. 260°C Thermal Resistance(θJC )….. ……….. .14°C/W (PSOP-8) …….............……..……. -65°C to 150°C Thermal Resistance(θJC )….. ……… 15.7°C/W (SOP-8) OPERATING RANGE (Note 1) Junction Temperature Range (Note 2) ……………….. 0°C to 125°C VCCA to GND ……………………………………………... 2.2V to 5.5V VIN to GND ……………………………………………... 2.2V to VCCA ELECTRICAL CHARACTERISTICS (Unless otherwise stated, these specifications apply TA=25°C; VCCA=VIN=+2.5V and VDDQ=+2.5V (Note 3)) maximum ratings are stress ratings only and functional device operation is not implied. Symbol Parameter Test Conditions VREF VREF Voltage VOS VOUT Output Voltage Offset Load Regulation CM8563 Min. Typ. Max. IREFOUT=0mA 1.21 1.235 1.26 IOUT=0A -15 (Note 4) -20 0 15 Unit V mV 20 IOUT: 0A -> 1.5A 0.5 % (Note 5) IOUT: 0A -> -1.5A -0.5 ZVREF VREF Output Impedance IREF= -5uA to +5uA 5 % kΩ ZVDDQ VDDQ Output Impedance 540 kΩ ICCQ Quiescent Current ｜ΔVLOAD｜ IOUT=0A (Note 6) 250 400 μA Power Good (Note 7) Note 1: Operating range indicates conditions for which the device is intended to be functional, but does not guarantee specific performance limits. For guaranteed specification and test conditions see Electrical Characteristics. Note 2: At elevated temperatures, devices must be derated based on the thermal resistance. The SO-8 package must be derated atθJA = 151℃/W junction to ambient with no heat sink. Note 3: Limits are 100% production tested at 25℃. Limits over the operating temperature range are guaranteed through correlation using Statistical Quality Control methods. Note 4: VOS = VREF – VOUT Note 5: Load regulation is tested by using a 10ms current pulse and measuring VOUT. Note 6: Quiescent current defined as the current flow into VCCA. Note 7: PG function but LP2995 does not have it. PG will be high as VTT is larger than 90% VREF, and PG will change to low as VTT is lower than 85% VREF. PG also will be low as VTT is greater than 115% VREF, and PG will change to high as VTT is lower than 110% VREF. It has both directions PG function. 2003/03/28 Champion Microelectronic Corporation Page 4 CM8563 1.5A LINEAR BUS TERMINATION REGULATOR FUNCTIONAL DESCRIPTION The CM8563 is a linear bus termination regulator designed to VFB meet the JEDEC requirements of SSTL-2 and SSTL-3. The The purpose of the VFB pin is to provide improved remote load CM8563 is capable of sinking and sourcing current at the regulation. In most motherboard applications the termination output VOUT, regulating the voltage to equal VDDQ/2. A resistors will connect to VOUT in a long plane. If the output buffered reference voltage that also tracks VDDQ/2 is voltage was regulated only at the output of the CM8563, then generated on the VREF pin for providing a global reference to the long trace will cause a significant IR drop, resulting in a the DDR-SDRAM and Northbridge Chipset. VOUT is designed termination voltage lower at one end of the bus than the other. to track the VREF voltage with a tight tolerance over the entire The VFB pin can be used to improve this performance, by current range while preventing shoot through on the output connecting it to the middle of the bus. This will provide a better stage. distribution across the entire termination bus. The CM8563 integrates power MOSFETs that are capable of VREF source and sink 1.5A of current while maintaining excellent VREF provides the buffered output of the internal reference voltage regulation. The output voltage can be regulated within voltage VDDQ/2. This output should be used to provide the 3% or less by using the external feedback. Separate voltage reference voltage of Northbridge chipset and memory. supply inputs have been added to fit applications with various power supplies for the databus and power buses. VOUT VOUT is the regulated output that is used to terminate the bus Pin Description resistors. It is capable of sinking and sourcing current while VCCA & VIN regulating the output precisely to VDDQ/2. The CM8563 is VCCA and VIN are the input supply pins for the CM8563. designed to handle peak transient currents of up to +/- 3A with a VCCA is used to supply all the internal control circuitry for the fast transient response. The maximum continuous current is a two op-amps and the output stage of VREF. VIN is used function of VIN. If a transient is expected to last above the exclusively to provide the rail voltage for the output stage on maximum continuous current rating for a significant amount of the power operational amplifier used to the 2.5V rail for time then the output capacitor should be sized large enough to optimal performance. This eliminates the need for bypassing prevent an excessive voltage drop. the two supply pins separately. VDDQ VDDQ is the input that is used to create the internal reference voltage for regulating VOUT and VREF. This voltage is generated by two internal 270kΩ resistors. This guarantees that VOUT and VREF will track VDDQ/2 precisely. 2003/03/28 Champion Microelectronic Corporation Page 5 CM8563 1.5A LINEAR BUS TERMINATION REGULATOR PACKAGE DIMENSION 8-Pin SOP (S08) PIN 1 ID θ θ 8-Pin SOP w/ Power Pad (PS08) θ θ 2003/03/28 Champion Microelectronic Corporation Page 6 CM8563 1.5A LINEAR BUS TERMINATION REGULATOR IMPORTANT NOTICE Champion Microelectronic Corporation (CMC) reserves the right to make changes to its products or to discontinue any integrated circuit product or service without notice, and advises its customers to obtain the latest version of relevant information to verify, before placing orders, that the information being relied on is current. A few applications using integrated circuit products may involve potential risks of death, personal injury, or severe property or environmental damage. CMC integrated circuit products are not designed, intended, authorized, or warranted to be suitable for use in life-support applications, devices or systems or other critical applications. Use of CMC products in such applications is understood to be fully at the risk of the customer. In order to minimize risks associated with the customer’s applications, the customer should provide adequate design and operating safeguards. HsinChu Headquarter Sales & Marketing 5F, No. 11, Park Avenue II, Science-Based Industrial Park, HsinChu City, Taiwan 300 11F, No. 306-3, Sec. 1, Ta Tung Rd., Hsichih, Taipei Hsien, Taiwan 221 T E L : +886-3-567 9979 F A X : +886-3-567 9909 http://www.champion-micro.com T E L : +886-2-8692 1591 F A X : +886-2-8692 1596 2003/03/28 Champion Microelectronic Corporation Page 7