CM8501IT

CM8501/A 1.5A BUS TERMINATOR GENERAL DESCRIPTION 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. 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. 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. FEATURES Patent Filed #6,452,366 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 Shutdown for standby or suspend mode operation 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 PCI/AGP Graphics Game/ Play Station Set Top Box IPC SCSI-III Bus terminator Buck Converter 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 1 2 3 4 PSOP-8 (PS08) Top View VC C A VC C Q AG N D SD PVD D VL PG ND VF B 8 7 6 5 1 2 3 4 5 6 7 8 VC CA NC NC NC AG N D SD VI N / 2 AG SEN NC PV DD VL PG ND NC VFB VC CQ NC 16 15 14 13 12 11 10 9 PIN DESCRIPTION Pin No. 8501 8501A 1 2,3,4,9,12,16 5 6 1 -3 4 Symbol VCCA NC AGND SD Description Voltage supply for internal circuits No Connection Ground for internal reference voltage divider CMOS input level Shutdown level Enable level 0.75 x VCCA 0 VCCQ/2 VCCA+0.3 2.0 V V Min. 2 Operating Rating Typ. Max. 2.5 5.5 Unit V 7 8 10 11 13 14 15 --2 5 6 7 8 VIN/2 Input for external reference voltage AGSEN Ground for remote sensing VCCQ VFB PGND VL PVDD Voltage reference for external voltage divider Feedback node for the VTT Ground for output power transistors Output voltage/inductor connection (IDD1+IDD2, Output RMS current) Voltage supply for output power transistors 2 2.5 5.5 V -2.0 +2.0 A 2.5 VCCQ/2 V V ORDERING INFORMATION Part Number CM8501IT CM8501IS CM8501AIS CM8501GIT* CM8501GIS* CM8501AGIS* *Note: G : Suffix for Pb Free Product Temperature Range -40℃ to 85℃ -40℃ to 85℃ -40℃ to 85℃ -40℃ to 85℃ -40℃ to 85℃ -40℃ to 85℃ Package 16-Pin PTSSOP (PT16) 16-Pin PSOP (PS16) 8-Pin PSOP (PS08) 16-Pin PTSSOP (PT16) 16-Pin PSOP (PS16) 8-Pin PSOP (PS08) 2006/10/11 Rev. 1.3 Champion Microelectronic Corporation Page 2 CM8501/A 1.5A BUS TERMINATOR BLOCK DIAGRAM SD 4 AGND 3 VCCQ 2 VCCA 1 OSCILLATOR RAMP GENERATOR 100K 100K S Q R Q ERROR AMP + - + RAMP AMP COMPARATOR THERMO20PF PROTECTION 5 VFB 6 PGND 7 VL 8 PVDD BLOCK DIAGRAM- 8 PIN AGSEN 8 VIN/2 7 SD 6 AGND 5 NC 4 NC 3 NC 2 VCCA 1 OSCILLATOR/ RAMP GENERATOR 100K S - Q R ERROR AMP + RAMP AMP COMPARATOR Q + - 100K THERMAL 20PF PROTECTION 9 NC 10 VCCQ 11 VFB 12 NC 13 PGND 14 VL 15 PVDD 16 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 100uf/6.3V NOTE: JP3---->USEING INTERNAL REFERENCE SOURCE(PIN 1, 2 SHORT) JP3---->USEING EXTERNAL REFERENCE SOURCE(PIN 2,3 SHORT) R4 1k 2 1 J1 PWR/IN TP1 BNC 1 D1 SK12 1 JP1 JUMPER 2 R1 100k 1 2 R2 1k C3 470 1 5 4 3 2 C2 105 PGND L1 3.3uH D2 SK12 8 7 6 5 C8 10uf/6.3V VDD VL FB 2 U2 CM-431 1 3 AGND VCCQ 2 1 J2 VTT 1 2 J3 VREF-OUT U1 C7 104 CM8501 C6 220uf/6.3V VCC SD 1 2 3 4 JP3 1 2 3 VCC R6 5R1 1 C4 105 2 R5 0 1 JP2 JUMPER 2 VDD C5 104 2 R3 100k 1 JP4 on/off sw 8-Pin Schematic 1.5A DDR BUS TERMINATOR DEMO BOARD CIRCUIT VCC VDD 2 1 J1 PWR/IN C1 100uf/6.3V 2 JP1 JUMPER 1 R2 1k R1 100k 1 1 R4 1k 2 C3 470 2 NOTE: C8 10uf/6.3V JP3---->USEING INTERNAL REFERENCE SOURCE(PIN 1, 2 SHORT) JP3---->USEING EXTERNAL REFERENCE SOURCE(PIN 2,3 SHORT) 2 4 3 TP1 BNC 1 D1 SK12 C2 105 U2 CM-431 1 3 5 12 11 16 15 14 13 10 9 L1 3.3uH 2 PVDD VFB VCCQ PGND D2 SK12 NC VL NC NC JP3 J2 VTT 1 2 J3 VREF-OUT U1 CM8501 1 VCC R6 5R1 2 JP2 JUMPER 2 R5 0 1 1 2 C4 105 VDD 3 4 5 6 7 C5 104 C9 102 8 2 R3 100k JP4 ON/OFF SW 16-Pin Schematic 2006/10/11 Rev. 1.3 Champion Microelectronic Corporation AGSEN AGND VCCA VIN/2 2 1 C7 104 C6 220uf/6.3V NC NC NC SD 1 2 3 1 2 Page 4 CM8501/A 1.5A BUS TERMINATOR ABSOLUTE MAXIMUM RATINGS Absolute maximum ratings are those values beyond which the device could be permanently damaged. PVDD/VCCA/VCCQ ......................................….......-0.3V to 4.0V Voltage on Any Other Pin …………... GND – 0.3V to VCC + 0.3V Output RMS Current, Source or Sink .....…………........…...1.5A Junction Temperature ...…………………… …………150°C Storage Temperature ……................……. -65°C to 125°C Lead Temperature (Soldering, 5 sec)……………….. 300°C 16-Pin Package Thermal Resistance(θJA )….. .. .40°C/W 8-Pin Package Thermal Resistance(θJA )….….. .50°C/W 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 SWITCHING REGULATOR IOUT = 0, VCCQ = 2.3V VCCQ = 2.5V Note 2 VL Output Voltage, SSTL_2 IOUT = ±1.5A, Note 2 Note 3 VIN/2 ZIN fsw IOUT(RMS) IOUT(PEAK) OTS MOSFETs RDS(ON) SUPPLY IVCCA IPVDD Quiescent Current VFB = 1.4V LC unconnected VFB = 1.4V LC unconnected 220 500 µA µA Drain to Source on-State Resistance PVDD=5V 250 mΩ Internal Resistor Divider VIN/2 Reference Pin Input Impedance Switching Frequency Minimum Output RMS Current Maximum Output Peak Current Over Temperature Shutdown IOUT = 0 Note 2 Note 2 VCCQ = 2.7V VCCQ = 2.3V VCCQ = 2.5V VCCQ = 2.7V VCCQ = 2.3V VCCQ = 2.5V VCCQ = 2.7V VCCQ = 0 0.9 1.5 135 1.12 1.22 1.32 1.09 1.19 1.28 1.139 1.238 1.337 1.15 1.25 1.35 1.15 1.25 1.35 1.15 1.25 1.35 50 1.2 2.0 3 150 1.5 1.18 1.28 1.38 1.21 1.31 1.42 1.162 1.263 1.364 V V V V V V V V V KΩ MHz A A ℃ Parameter Test Conditions CM8501/A Min. Typ. Max. Unit CM8501/A CM8501/A CM8501/A CM8501/A 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 sinking and sourcing 1.5A of current without an external heat sink. CM8501/A uses a standard surface mount PTSSOP and PSOP package with bottom metal exposed and the heat can be piped through the bottom of the device and onto the PCB. The CM8501/A 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. INPUTS The input voltage pins (VCCQ & VIN/2 of CM8501 or VCCQ of CM8501A) determine the output voltages (VL). At CM8501, when the VIN/2 pin is open, the output voltage is 50% of the VCCQ input. If a specific voltage is forced at the VIN/2 pin, the output voltage follows the voltage at the VIN/2 pin. At CM8501A, the output voltage is always 50% of the VCCQ input. VCCQ is suggested to connect to VCCQ of memory module for better tracking with memory VCCQ. OTHER SUPPLY VOLTAGES Several inputs are provided for the supply voltages: PVDD and VCCA The PVDD provide the power supply to the power MOSFETs. VCCA provide the voltage supply to the logic section and internal error amplifiers of CM8501/A. OUPUTS The output voltage pins (VL) are tied to the databus, address, or clock lines via an external inductor. Output voltage is determined by the VCCQ or VIN/2 inputs for CM8501 and is determined by the VCCQ only for CM8501A. FEEDBACK 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 16-PIN PSOP (PS16) θ 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 5F, No. 11, Park Avenue II, Science-Based Industrial Park, HsinChu City, Taiwan 300 T E L : +886-3-567 9979 F A X : +886-3-567 9909 http://www.champion-micro.com Sales & Marketing 7F-6, No. 32, Sec. 1, Chenggong Rd., Nangang District , Taipei City 115 Taiwan 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