CM8501C 1.5A BUS TERMINATOR GENERAL DESCRIPTION FEATURES The CM8501C 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 4.5V. The CM8501C 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 CM8501C 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 CM8501C 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 CM8501C provides low profile 8-pin PSOP package to save system space. Soft start 8-pin SOP 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 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 APPLICATIONS Mother Board IPC PCI/AGP Graphics SCSI-III Bus terminator Game/ Play Station Buck Converter Set Top Box PIN CONFIGURATION SOP-8 (S08) Top View 2004/06/01 Rev. 1.1 1 VCCA PVDD 8 2 VCCQ VL 7 3 AGND PGND 6 4 SD VFB 5 Champion Microelectronic Corporation Page 1 CM8501C 1.5A BUS TERMINATOR PIN DESCRIPTION Pin No. Symbol Description Min. 1 VCCA Voltage supply for internal circuits 3 AGND Ground for internal reference voltage divider 4 SD Shutdown active high. CMOS input level 2 VCCQ Voltage reference for external voltage divider 5 VFB Feedback node for the VTT 6 PGND Ground for output power transistors 7 VL Output voltage/inductor connection (IDD1+IDD2, Operating Rating Typ. Max. Unit 2.0 4.5 V 0.75 x VCCA V VCCA + 0.3V 2.5 V VCCQ/2 V -1.5 +1.5 A 2.0 4.5 V Output RMS current) 8 PVDD Voltage supply for output power transistors ORDERING INFORMATION Part Number Temperature Range Package CM8501CIS -40℃ to 85℃ 8-Pin SOP (S08) -40℃ to 85℃ 8-Pin SOP (S08) CM8501CGIS* *Note: G : Suffix for Pb Free Product BLOCK DIAGRAM SD AGND 4 VCCA VCCQ 3 1 2 OSCILLATOR RAMP GENERATOR 100K 100K S Q R Q - ERROR AMP + + RAMP AMP COMPARATOR - THERMO20PF 5 VFB 2004/06/01 Rev. 1.1 PROTECTION 6 PGND 7 VL Champion Microelectronic Corporation 8 PVDD Page 2 CM8501C 1.5A BUS TERMINATOR APPLICATION CIRCUITS 1.5A DDR BUS TERMINATOR DEMO BOARD CIRCUIT VDD VCC C1 2 1 1 JP1 JUMPER 1 2 6 5 FB U2 CM-431 R6 1 C4 2 SD 3 JP3 1 2 3 VCC J3 VREF-OUT C8 10uf/6.3V R4 1k 1 4 1 J2 VTT 1 2 CM8501 AGND C6 220uf/6.3V C7 104 VCC 2 1 U1 3 D2 SK12 JP3---->USEING EXTERNAL REFERENCE SOURCE(PIN 2,3 SHORT) 2 C3 470 1 PGND VDD 2 8 L1 3.3uH 105 7 C2 VCCQ 3 D1 SK12 VL 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 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 4.5V Lead Temperature (Soldering, 5 sec)……………….. 300°C Thermal Resistance(θJA )….. ……………….. .100°C/W Voltage on Any Other Pin ………... GND – 0.3V to VCC + 0.3V Output RMS Current, Source or Sink .....…………........…...1.5A OPERATING CONDITIONS Temperature Range ............................. -40°C to 85°C PVDD Operating Range .........................2.0V to 4.5V 2004/06/01 Rev. 1.1 Champion Microelectronic Corporation Page 3 CM8501C 1.5A BUS TERMINATOR 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 CM8501C Min. Typ. Max. 1.12 1.15 1.18 Unit SWITCHING REGULATOR IOUT = 0, VCCQ = 2.3V VL Output Voltage, SSTL_2 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 50 V KΩ 1.2 MHz 2.0 A Note 2 Note 3 VIN/2 Internal Resistor Divider ZIN VIN/2 Reference Pin Input Impedance V IOUT = 0 Note 2 Note 2 VCCQ = 0 fsw Switching Frequency CM8501C IOUT(RMS) Minimum Output RMS Current CM8501C IOUT(PEAK) Maximum Output Peak Current CM8501C OTS Over Temperature Shutdown CM8501C Drain to Source on-State Resistance PVDD=5V 1.5 3 135 V 150 A ℃ 250 mΩ 220 µA 500 µA MOSFETs RDS(ON) SUPPLY IVCCA Quiescent Current VFB = 1.4V LC unconnected VFB = 1.4V IPVDD 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% Note 3: Guaranteed by design, not 100% test 2004/06/01 Rev. 1.1 Champion Microelectronic Corporation Page 4 CM8501C 1.5A BUS TERMINATOR FUNCTIONAL DESCRIPTION The CM8501C 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) determine the output voltages sink. (VL). At CM8501C, the output voltage is always 50% of the VCCQ input. VCCQ is suggested to connect to VCCQ of The CM8501C integrates power MOSFETs that are capable memory module for better tracking with memory VCCQ. of source and sink 1.5A of current while maintaining excellent voltage regulation. The output voltage can be regulated within OTHER SUPPLY VOLTAGES 3% or less by using the external feedback. Separate voltage Several inputs are provided for the supply voltages: PVDD and supply inputs have been added to fit applications with various VCCA power supplies for the databus and power buses. The PVDD provide the power supply to the power MOSFETs. VCCA provide the voltage supply to the logic section and OUPUTS internal error amplifiers of CM8501C. The output voltage pins (VL) are tied to the databus, address, or clock lines via an external inductor. Output voltage is FEEDBACK determined by the VCCQ and is determined by the VCCQ. 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. PACKAGE DIMENSION 8-PIN SOP (S08) PIN 1 ID θ θ 2004/06/01 Rev. 1.1 Champion Microelectronic Corporation Page 5 CM8501C 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 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 2004/06/01 Rev. 1.1 Champion Microelectronic Corporation Page 6