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CM8501C
1.5A BUS TERMINATOR
GENERAL DESCRIPTION
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. The CM8501C provides low profile 8-pin PSOP package to save system space.
FEATURES
Patent Filed #6,452,366 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 Soft start
APPLICATIONS
Mother Board PCI/AGP Graphics Game/ Play Station Set Top Box IPC SCSI-III Bus terminator Buck Converter
PIN CONFIGURATION
SOP-8 (S08) Top View
1 2 3 4 VCCA VCCQ AGND SD PVDD VL PGND VFB 8 7 6 5
2006/10/11 Rev. 1.2
Champion Microelectronic Corporation
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CM8501C
1.5A BUS TERMINATOR
PIN DESCRIPTION
Pin No. 1 3 4 2 5 6 7 8 Symbol VCCA AGND SD VCCQ VFB PGND VL PVDD Description Voltage supply for internal circuits Ground for internal reference voltage divider Shutdown active high. CMOS input level 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 2.0 4.5 V -1.5 +1.5 A 0.75 x VCCA 2.5 VCCQ/2 VCCA + 0.3V V V V Min. 2.0 Operating Rating Typ. Max. Unit 4.5 V
ORDERING INFORMATION
Part Number CM8501CIS CM8501CGIS* *Note: G : Suffix for Pb Free Product Temperature Range -40 to 85 -40 to 85 Package 8-Pin SOP (S08) 8-Pin SOP (S08)
BLOCK DIAGRAM
SD 4 AGND 3
VCCQ 2 VCCA 1
OSCILLATOR RAMP GENERATOR
100K
100K
S -
Q
R
ERROR AMP + RAMP AMP COMPARATOR
Q
+ -
THERMO20PF
PROTECTION
5 VFB
6 PGND
7 VL
8 PVDD
2006/10/11 Rev. 1.2
Champion Microelectronic Corporation
Page 2
CM8501C
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
ABSOLUTE MAXIMUM RATINGS
Absolute maximum ratings are those values beyond which the device could be permanently damaged. PVDD/VCCA/VCCQ ................................................-0.3V to 4.5V Voltage on Any Other Pin ............ GND - 0.3V to VCC + 0.3V Output RMS Current, Source or Sink ...............................1.5A Junction Temperature ........................... ............150C Storage Temperature ............................. -65C to 125C Lead Temperature (Soldering, 5 sec).................... 300C Thermal Resistance(JA )..... .................... .100C/W
OPERATING CONDITIONS
Temperature Range ............................. -40C to 85C PVDD Operating Range .........................2.0V to 4.5V
2006/10/11 Rev. 1.2
Champion Microelectronic Corporation
2
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CM8501C
1.5A BUS TERMINATOR
(Unless otherwise stated, these specifications apply TA=25C; VCCA=+3.3V and PVDD=+3.3V) maximum ratings are stress ratings only and functional device operation is not implied. (Note 1) CM8501C Min. 1.12 1.22 1.32 1.09 1.19 1.28 1.139 1.238 1.337 Typ. 1.15 1.25 1.35 1.15 1.25 1.35 1.15 1.25 1.35 50 1.2 1.5 135 2.0 3 150 250 Max. 1.18 1.28 1.38 1.21 1.31 1.42 1.162 1.263 1.364
ELECTRICAL CHARACTERISTICS
Symbol SWITCHING REGULATOR
Parameter
Test Conditions
Unit
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 Drain to Source on-State Resistance PVDD=5V 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
V V V V V V V V V K MHz A A m
CM8501C CM8501C CM8501C CM8501C
220 500
A A
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
2006/10/11 Rev. 1.2
Champion Microelectronic Corporation
Page 4
CM8501C
1.5A BUS TERMINATOR
FUNCTIONAL DESCRIPTION
The CM8501C is a switching regulator that is capable of sinking and sourcing 1.5A of current without an external heat sink. The CM8501C 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) determine the output voltages (VL). At CM8501C, 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 CM8501C.
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 and is determined by the VCCQ.
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.
PACKAGE DIMENSION
8-PIN SOP (S08)
PIN 1 ID
2006/10/11 Rev. 1.2
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
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. 1.2
Champion Microelectronic Corporation
Page 6

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