CM8501/A 1.5A BUS TERMINATOR GENERAL DESCRIPTION FEATURES The CM8501/A is a low cost switching regulator designed to provide a desired output voltage or termination voltage for various applications by converting voltage supplies ranging from 2.0V to 4.0V. The CM8501 can be implemented to produce regulated output voltages in two different modes. In the default mode, when the VIN/2 pin is open, the output voltage is 50% of the VCCQ. The CM8501 can also be used to produce various user-defined voltages by forcing a voltage on the VIN/2 pin. In this case, the output voltage follows the VIN/2 pin input voltage. The regulated output voltage of CM8501A is internally set to be 50% of the applied VCCQ. The switching regulator is capable of sourcing or sinking up to 1.5A of current while regulating an output V TT voltage to within 3% or less. Patent Filed #6,452,366 The CM8501A could guarantee to provide continuous sinking or sourcing up to 2A current while enlarging the layout GND pad dimension as layout suggestion in page 6. Shutdown for standby or suspend mode operation The CM8501/A provides low profile 8-pin PSOP package to save system space as well as 16-pin PSOP and PTSSOP packages that are pin-to-pin compatible to the previous CM8500. 8-pin PSOP, 16 pin PTSSOP and 16 pin PSOP power packages Source and sink up to 1.5A, no heat sink required Peak Current to 3A Integrated Power MOSFETs Output voltage can be programmed by external resistors (CM8501) Separate voltages for VCCQ and PVDD V OUT of ±3% or less at 1.5A Minimum external components Thermal shutdown protection Soft start 24 Hours Technical Support---WebSIM Champion provides customers an online circuit simulation tool called WebSIM. You could simply logon our website at www.champion-micro.com for details. APPLICATIONS Mother Board IPC PCI/AGP Graphics SCSI-III Bus terminator Game/ Play Station Buck Converter Set Top Box 2006/10/11 Rev. 1.3 Champion Microelectronic Corporation Page 1 CM8501/A 1.5A BUS TERMINATOR PIN CONFIGURATION PSOP-16 (PS16)/PTSSOP-16 (PT16) Top View PSOP-8 (PS08) Top View NC 16 1 VCCA PVDD 8 NC PVDD 15 2 VCCQ VL 7 3 NC VL 14 3 AGND PGND 6 4 NC PGND 13 4 SD VFB 5 5 AGND NC 12 6 SD VFB 11 7 VIN/2 VCCQ 10 8 AGSEN 1 VCCA 2 NC 9 PIN DESCRIPTION Pin No. 8501 8501A Symbol Description 1 1 VCCA Voltage supply for internal circuits 2,3,4,9,12,16 -- NC No Connection 5 3 AGND Ground for internal reference voltage divider 6 4 SD CMOS input level Shutdown level Min. 2 -- VIN/2 V 0.75 x VCCA VCCA+0.3 V 0 2.0 Input for external reference voltage 8 -- AGSEN Ground for remote sensing 10 2 VCCQ Voltage reference for external voltage divider 11 5 VFB Feedback node for the VTT 13 6 PGND Ground for output power transistors 14 7 VL Output voltage/inductor connection (IDD1+IDD2, 2.5 Unit 5.5 Enable level 7 Operating Rating Typ. Max. VCCQ/2 V 2.5 V VCCQ/2 V -2.0 +2.0 A 5.5 V Output RMS current) 15 8 PVDD Voltage supply for output power transistors 2 2.5 ORDERING INFORMATION Part Number Temperature Range Package CM8501IT -40℃ to 85℃ 16-Pin PTSSOP (PT16) CM8501IS -40℃ to 85℃ 16-Pin PSOP (PS16) CM8501AIS -40℃ to 85℃ 8-Pin PSOP (PS08) CM8501GIT* -40℃ to 85℃ 16-Pin PTSSOP (PT16) CM8501GIS* -40℃ to 85℃ 16-Pin PSOP (PS16) -40℃ to 85℃ 8-Pin PSOP (PS08) CM8501AGIS* *Note: G : Suffix for Pb Free Product 2006/10/11 Rev. 1.3 Champion Microelectronic Corporation Page 2 CM8501/A 1.5A BUS TERMINATOR BLOCK DIAGRAM SD VCCA VCCQ AGND 4 1 2 3 OSCILLATOR RAMP GENERATOR 100K 100K S Q R Q + ERROR AMP + RAMP AMP COMPARATOR - THERMO20PF PROTECTION 5 7 6 VFB 8 VL PGND PVDD BLOCK DIAGRAM- 8 PIN AGSEN VIN/2 8 7 AGND SD 6 5 NC NC NC 4 3 2 VCCA 1 OSCILLATOR/ RAMP GENERATOR 100K S Q R Q + ERROR AMP + RAMP AMP COMPARATOR - 100K THERMAL 20PF 9 10 NC VCCQ PROTECTION 11 12 VFB NC 13 PGND 14 15 16 VL PVDD NC BLOCK DIAGRAM- 16 PIN 2006/10/11 Rev. 1.3 Champion Microelectronic Corporation Page 3 CM8501/A 1.5A BUS TERMINATOR APPLICATION CIRCUITS 1.5A DDR BUS TERMINATOR DEMO BOARD CIRCUIT VDD VCC C1 2 1 1 JP1 JUMPER FB U2 CM-431 CM8501 3 1 2 2 1 2 JP3 1 2 3 VCC J3 VREF-OUT 1 R6 C4 3 SD VCC 1 J2 VTT C8 10uf/6.3V R4 1k 4 C6 220uf/6.3V C7 104 1 5 6 U1 2 1 PGND D2 SK12 JP3---->USEING EXTERNAL REFERENCE SOURCE(PIN 2,3 SHORT) 2 C3 470 1 VL VDD 2 8 L1 3.3uH 105 7 C2 VCCQ 3 D1 SK12 AGND TP1 BNC 1 R1 100k JP3---->USEING INTERNAL REFERENCE SOURCE(PIN 1, 2 SHORT) R2 1k 2 2 5 J1 PWR/IN 4 NOTE: 100uf/6.3V 105 5R1 2 2 1 R5 0 JP2 JUMPER VDD C5 104 2 1 R3 100k JP4 on/off sw 8-Pin Schematic 1.5A DDR BUS TERMINATOR DEMO BOARD CIRCUIT VCC VDD C1 100uf/6.3V C3 470 JP3---->USEING INTERNAL REFERENCE SOURCE(PIN 1, 2 SHORT) JP3---->USEING EXTERNAL REFERENCE SOURCE(PIN 2,3 SHORT) 3 2 9 NC AGSEN JP3 1 2 3 8 11 10 VFB VCCQ VIN/2 SD 6 7 12 NC AGND 13 PGND NC U2 CM-431 1 5 14 VL 4 1 U1 CM8501 NC J2 VTT 15 16 NC C6 220uf/6.3V 3 C7 104 PVDD 2 D2 SK12 NOTE: C8 10uf/6.3V R4 1k 2 C2 105 L1 3.3uH 2 1 2 1 D1 SK12 NC 3 R1 100k JP1 JUMPER VCCA 4 J1 PWR/IN 1 R2 1k 2 2 5 2 1 TP1 BNC 1 1 VCC 1 2 R6 J3 VREF-OUT 1 C4 105 VDD 5R1 2 JP2 JUMPER 1 2 C5 104 JP4 ON/OFF SW C9 102 1 2 R3 100k R5 0 16-Pin Schematic 2006/10/11 Rev. 1.3 Champion Microelectronic Corporation Page 4 CM8501/A 1.5A BUS TERMINATOR ABSOLUTE MAXIMUM RATINGS Absolute maximum ratings are those values beyond which the Junction Temperature ...…………………… …………150°C device could be permanently damaged. Storage Temperature ……................……. -65°C to 125°C PVDD/VCCA/VCCQ ......................................….......-0.3V to 4.0V Voltage on Any Other Pin …………... GND – 0.3V to VCC + 0.3V Lead Temperature (Soldering, 5 sec)……………….. 300°C 16-Pin Package Thermal Resistance(θJA )….. .. .40°C/W Output RMS Current, Source or Sink 8-Pin Package Thermal Resistance(θJA )….….. .50°C/W .....…………........…...1.5A OPERATING CONDITIONS Temperature Range ............................. -40°C to 85°C PVDD Operating Range .........................2.0V to 4.0V ELECTRICAL CHARACTERISTICS (Unless otherwise stated, these specifications apply TA=25°C; VCCA=+3.3V and PVDD=+3.3V) maximum ratings are stress ratings only and functional device operation is not implied. (Note 1) Symbol Parameter Test Conditions CM8501/A Unit Min. Typ. Max. IOUT = 0, VCCQ = 2.3V 1.12 1.15 1.18 V VCCQ = 2.5V 1.22 1.25 1.28 V Note 2 VCCQ = 2.7V 1.32 1.35 1.38 V IOUT = VCCQ = 2.3V 1.09 1.15 1.21 V ±1.5A, VCCQ = 2.5V 1.19 1.25 1.31 V VCCQ = 2.7V 1.28 1.35 1.42 VCCQ = 2.3V 1.139 1.15 1.162 V VCCQ = 2.5V 1.238 1.25 1.263 V VCCQ = 2.7V 1.337 1.35 1.364 V KΩ 1.5 MHz SWITCHING REGULATOR VL Output Voltage, SSTL_2 Note 2 Note 3 VIN/2 IOUT = 0 Internal Resistor Divider Note 2 Note 2 VCCQ = 0 50 V ZIN VIN/2 Reference Pin Input Impedance fsw Switching Frequency CM8501/A 0.9 1.2 IOUT(RMS) Minimum Output RMS Current CM8501/A 1.5 2.0 IOUT(PEAK) Maximum Output Peak Current CM8501/A OTS Over Temperature Shutdown CM8501/A 135 150 A ℃ Drain to Source on-State Resistance PVDD=5V 250 mΩ 220 µA 500 µA A 3 MOSFETs RDS(ON) SUPPLY IVCCA Quiescent Current IPVDD VFB = 1.4V LC unconnected VFB = 1.4V LC unconnected Note 1: Limits are guaranteed by 100% testing, sampling, or correlation with worst case test conditions Note 2: VCCA, PVDD = 3.3V ±10%, VIN/2=open for CM8501 Note 3: Guaranteed by design, not 100% test 2006/10/11 Rev. 1.3 Champion Microelectronic Corporation Page 5 CM8501/A 1.5A BUS TERMINATOR FUNCTIONAL DESCRIPTION The CM8501/A is a switching regulator that is capable of INPUTS sinking and sourcing 1.5A of current without an external heat The input voltage pins (VCCQ & VIN/2 of CM8501 or VCCQ of sink. CM8501/A uses a standard surface mount PTSSOP CM8501A) determine the output voltages (VL). At CM8501, and PSOP package with bottom metal exposed and the heat when the VIN/2 pin is open, the output voltage is 50% of the can be piped through the bottom of the device and onto the VCCQ input. If a specific voltage is forced at the VIN/2 pin, the PCB. output voltage follows the voltage at the VIN/2 pin. At CM8501A, the output voltage is always 50% of the VCCQ input. The CM8501/A integrates power MOSFETs that are capable VCCQ is suggested to connect to VCCQ of memory module for of source and sink 1.5A of current while maintaining excellent better tracking with memory VCCQ. voltage regulation. The output voltage can be regulated within 3% or less by using the external feedback. Separate voltage OTHER SUPPLY VOLTAGES supply inputs have been added to fit applications with various Several inputs are provided for the supply voltages: PVDD and power supplies for the databus and power buses. VCCA The PVDD provide the power supply to the power MOSFETs. OUPUTS VCCA provide the voltage supply to the logic section and The output voltage pins (VL) are tied to the databus, address, internal error amplifiers of CM8501/A. or clock lines via an external inductor. Output voltage is determined by the VCCQ or VIN/2 inputs for CM8501 and is FEEDBACK determined by the VCCQ only for CM8501A. The VFB pin is an input that can be used for closed loop compensation. This input is derived from the voltage output. AGSEN pin is a contact node of internal resistor divider for remote sense (CM8501). 2006/10/11 Rev. 1.3 Champion Microelectronic Corporation Page 6 CM8501/A 1.5A BUS TERMINATOR Suggested Layout GND Pad Dimension: to guarantee providing continuous sinking or sourcing current up to 2A. PSOP-08 Bottom GND Pad Package 2.34 X 2.92 mm Layout GND Pad Package Package Bottom View Land Pattern Comp Side Solder Mask GND Pad Package 2.4 X 3.0 mm Solder Mask Comp Side 2006/10/11 Rev. 1.3 Champion Microelectronic Corporation Page 7 CM8501/A 1.5A BUS TERMINATOR PACKAGE DIMENSION 8-PIN PSOP (PS08) θ θ 2006/10/11 Rev. 1.3 Champion Microelectronic Corporation Page 8 CM8501/A 1.5A BUS TERMINATOR PACKAGE DIMENSION 16-PIN PTSSOP (PT16) θ θ 16-PIN PSOP (PS16) θ θ 2006/10/11 Rev. 1.3 Champion Microelectronic Corporation Page 9 CM8501/A 1.5A BUS TERMINATOR 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 7F-6, No. 32, Sec. 1, Chenggong Rd., Nangang District , Taipei City 115 Taiwan T E L : +886-3-567 9979 F A X : +886-3-567 9909 http://www.champion-micro.com T E L : +886-2-2788 0558 F A X : +886-2-2788 2985 2006/10/11 Rev. 1.3 Champion Microelectronic Corporation Page 10