View CM8501IT_1227087.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

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
2005/02/02 Rev. 1.2
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
VCCA VCCQ AGND SD PVDD VL PGND VFB 8 7 6 5
1 2 3 4 5 6 7 8
VCCA NC NC NC AGND SD VIN/2 AGSEN
NC PVDD VL PGND NC VFB VCCQ 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)
2005/02/02 Rev. 1.2
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
2005/02/02 Rev. 1.2
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
1
JP1 JUMPER
5
J1 PWR/IN
TP1 BNC 1
D1 SK12
2
4
C2
105
R1 100k
1
R2 1k
2
C3 470
1
3
PGND
L1 3.3uH
2
D2 SK12
8
7
6
5
C8 10uf/6.3V
VDD
VL
FB
2
U2 CM-431
1
3
AGND
VCCQ
2 1
U1
C7 104
CM8501
C6 220uf/6.3V
VCC
J2 VTT
1 2
SD
1
2
3
4
JP3
1 2 3
J3 VREF-OUT
VCC
R6 5R1
1
C4 105
2
1
2
JP2 JUMPER
R5 0
VDD
C5 104
2
1
R3 100k
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
1
2
1
2
NOTE:
R4 1k
R2 1k
R1 100k
C8 10uf/6.3V
JP1 JUMPER
JP3---->USEING INTERNAL REFERENCE SOURCE(PIN 1, 2 SHORT)
JP3---->USEING EXTERNAL REFERENCE SOURCE(PIN 2,3 SHORT)
2
C3 470
2
4
3
TP1 BNC 1
D1 SK12
1
C2 105
U2 CM-431
5
1
3
12
11
16
15
14
13
10
9
L1 3.3uH
2
PVDD
VFB
PGND
VCCQ
D2 SK12
NC
VL
NC
NC
JP3
VCCA
NC
NC
J2 VTT
1 2
J3 VREF-OUT
U1 CM8501
1
VCC
R6 5R1
1
2
C4 105
VDD
3
4
5
6
7
2 JP2 JUMPER
2
R5 0
C5 104
C9 102
8
2
R3 100k
1
JP4 ON/OFF SW
16-Pin Schematic
2005/02/02 Rev. 1.2
Champion Microelectronic Corporation
AGSEN
AGND
VIN/2
2 1
C7 104
C6 220uf/6.3V
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 ........................... ............150C Storage Temperature ............................. -65C to 125C Lead Temperature (Soldering, 5 sec).................... 300C 16-Pin Package Thermal Resistance(JA )..... .. .40C/W 8-Pin Package Thermal Resistance(JA )......... .50C/W
OPERATING CONDITIONS
Temperature Range ............................. -40C to 85C PVDD Operating Range .........................2.0V to 4.0V
ELECTRICAL CHARACTERISTICS (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)
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 A A Drain to Source on-State Resistance PVDD=5V 250 m 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 K 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
2005/02/02 Rev. 1.2
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).
2005/02/02 Rev. 1.2
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
2005/02/02 Rev. 1.2
Champion Microelectronic Corporation
Page 7
CM8501/A
1.5A BUS TERMINATOR
PACKAGE DIMENSION
8-PIN PSOP (PS08)
2005/02/02 Rev. 1.2
Champion Microelectronic Corporation
Page 8
CM8501/A
1.5A BUS TERMINATOR
PACKAGE DIMENSION
16-PIN PTSSOP (PT16)
16-PIN PSOP (PS16)
2005/02/02 Rev. 1.2
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
11F, No. 306-3, Sec. 1, Ta Tung Rd., Hsichih, Taipei Hsien, Taiwan 221 T E L : +886-2-8692 1591 F A X : +886-2-8692 1596
2005/02/02 Rev. 1.2
Champion Microelectronic Corporation
Page 10

▲Up To Search▲

Price & Availability of CM8501IT

	To Download CM8501IT Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .