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CM8563
1.5A LINEAR BUS TERMINATION REGULATOR
GENERAL DESCRIPTION
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. . 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.
FEATURES
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
APPLICATIONS
Mother Board PCI/AGP Graphics DDR Termination Voltage (SSTL-2 & SSTL-3)
PIN CONFIGURATION
SOP-8 (S08) Top View
1 2 3 4 PG GND VFB VREF VOUT VIN VCCA VDDQ 8 7 6 5
TYPICAL APPLICATION
VREF = 1.25V
U1 CM8563 VREF 0.1uF
PG
PG
VDDQ = 2.5V VCCA = 2.5V
VDDQ
VOUT 220uF
VOUT = 1.25V
VCCA
VFB
VIN 50uF
GND
2003/03/28
Champion Microelectronic Corporation
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CM8563
1.5A LINEAR BUS TERMINATION REGULATOR
PIN DESCRIPTION
Pin No. 1 2 3 4 5 6 7 8 PG GND VFB VREF VDDQ VCCA VIN VOUT Symbol Power Good Ground Feedback pin for regulating VOUT Buffered reference Voltage Input for internal reference equal to VDDQ/2 Analog input Power input Output voltage for connection to termination resistors Description
ORDERING INFORMATION
Part Number CM8563IS CM8563PIS Temperature Range -40 to 85 -40 to 85 Package 8-Pin SOP (S08) 8-Pin PSOP (PS08)
BLOCK DIAGRAM
VCCA 6 VDDQ 5 VIN 7
270k
+
-
270k
PG 1 Power Good
2 GND
2003/03/28
Champion Microelectronic Corporation
-
4
+
VREF
8
VOUT
3
VFB
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CM8563
1.5A LINEAR BUS TERMINATION REGULATOR
APPLICATION CIRCUITS
U1 CM8563 VREF
PG
PG
VREF
VDDQ
VDDQ
VOUT COUT
VOUT
VCCA
VCCA
VFB
VIN CIN
GND
Application Circuit for Bus Termination
U1
CM8563
VREF
PG
PG
VREF
VDDQ
VDDQ
VOUT
VOUT
R1
COUT
VCCA
VCCA
VFB
R1
VIN
CIN
GND
Application Circuit for Adjustable Output Voltage
2003/03/28
Champion Microelectronic Corporation
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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 .................................. -65C to 150C Lead Temperature (Soldering, 5 sec).................... 260C Thermal Resistance(JC )..... ........... .14C/W (PSOP-8) Thermal Resistance(JC )..... ......... 15.7C/W (SOP-8)
OPERATING RANGE (Note 1)
Junction Temperature Range (Note 2) .................... 0C to 125C VCCA to GND ...................................................... 2.2V to 5.5V VIN to GND ...................................................... 2.2V to VCCA
ELECTRICAL CHARACTERISTICS (Unless otherwise stated, these specifications apply TA=25C; VCCA=VIN=+2.5V and VDDQ=+2.5V (Note 3)) maximum ratings are stress ratings only and functional device operation is not implied.
Symbol VREF VOS VLOAD ZVREF ZVDDQ ICCQ 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 atJA = 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. Parameter VREF Voltage VOUT Output Voltage Offset Load Regulation (Note 5) VREF Output Impedance VDDQ Output Impedance Quiescent Current IOUT=0A (Note 6) Test Conditions IREFOUT=0mA IOUT=0A (Note 4) IOUT: 0A -> 1.5A IOUT: 0A -> -1.5A IREF= -5uA to +5uA CM8563 Min. 1.21 -15 -20 Typ. 1.235 0 0.5 -0.5 5 540 250 400 Max. 1.26 15 20 Unit V mV % % k k A
2003/03/28
Champion Microelectronic Corporation
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CM8563
1.5A LINEAR BUS TERMINATION REGULATOR
FUNCTIONAL DESCRIPTION
The CM8563 is a linear bus termination regulator designed to meet the JEDEC requirements of SSTL-2 and SSTL-3. The CM8563 is capable of sinking and sourcing current at the output VOUT, regulating the voltage to equal VDDQ/2. A buffered reference voltage that also tracks VDDQ/2 is generated on the VREF pin for providing a global reference to to track the VREF voltage with a tight tolerance over the entire current range while preventing shoot through on the output stage. The CM8563 integrates power MOSFETs that are capable of source and sink 1.5A of current while maintaining excellent voltage regulation. The output voltage can be regulated within 3% or less by using the external feedback. Separate voltage 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 resistors. It is capable of sinking and sourcing current while regulating the output precisely to VDDQ/2. The CM8563 is designed to handle peak transient currents of up to +/- 3A with a fast transient response. The maximum continuous current is a function of VIN. If a transient is expected to last above the maximum continuous current rating for a significant amount of time then the output capacitor should be sized large enough to prevent an excessive voltage drop. VFB The purpose of the VFB pin is to provide improved remote load regulation. In most motherboard applications the termination resistors will connect to VOUT in a long plane. If the output voltage was regulated only at the output of the CM8563, then the long trace will cause a significant IR drop, resulting in a The VFB pin can be used to improve this performance, by connecting it to the middle of the bus. This will provide a better distribution across the entire termination bus.
the DDR-SDRAM and Northbridge Chipset. VOUT is designed termination voltage lower at one end of the bus than the other.
VREF VREF provides the buffered output of the internal reference voltage VDDQ/2. This output should be used to provide the reference voltage of Northbridge chipset and memory.
Pin Description
VCCA & VIN VCCA and VIN are the input supply pins for the CM8563. VCCA is used to supply all the internal control circuitry for the two op-amps and the output stage of VREF. VIN is used exclusively to provide the rail voltage for the output stage on the power operational amplifier used to the 2.5V rail for optimal performance. This eliminates the need for bypassing 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 270k resistors. This guarantees that VOUT and VREF will track VDDQ/2 precisely.
2003/03/28
Champion Microelectronic Corporation
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CM8563
1.5A LINEAR BUS TERMINATION REGULATOR
PACKAGE DIMENSION
8-Pin SOP (S08)
PIN 1 ID
8-Pin SOP w/ Power Pad (PS08)
2003/03/28
Champion Microelectronic Corporation
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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.
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2003/03/28
Champion Microelectronic Corporation
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