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Sink/Source Regulator. CM3109 Datasheet

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Sink/Source Regulator. CM3109 Datasheet
















CM3109 Regulator. Datasheet pdf. Equivalent













Part

CM3109

Description

2A Sink/Source Regulator



Feature


CM3109 2A Sink/Source Regulator for Fron t Side Bus and DDR Memory Bus Terminati on Features Ideal for both PC Front Sid e Bus and DDR memory VTT applications Sinks and sources 2A • Over curren t protection • Over temperature prote ction • Shutdown function www.DataShe et4U.com • Integrated power MOSFETs Excellent accuracy (0.5% of load reg ulation) • Minimum external co.
Manufacture

California Micro Devices

Datasheet
Download CM3109 Datasheet


California Micro Devices CM3109

CM3109; mponents • 8 pin PSOP package • Lead -free version available • Product De scription The CM3109 is a sinking and s ourcing regulator specifically designed for series-parallel bus termination fo r high speed chip set buses as well as DDR memory systems. It can source and s ink current up to 2A with high accuracy of 0.5 %. The VTT output voltage is se lectable by VDDQSEL and .


California Micro Devices CM3109

FSBSEL pins. The VDDQSEL pin controls wh ether the CM3109 is in DDR memory mode with VTT = VDDQ/2, or in FSB mode. In F SB mode, FSBSEL controls whether VTT is 1.225V or 1.45V. This allows the same chip to be used in two different circui ts on PC motherboards that support both Northwood and Prescott processors. The CM3109 requires no external components to use the GMCH E.


California Micro Devices CM3109

nable signal in Intel chipset or corresp onding signals for other chip sets when powering up the PC. For the boards whi ch support Suspend to RAM (STR) functio nality, CM3109 provides a shutdown (SD) pin. When SD is set low, VTT will be i n tri-state mode, causing the output to go high impedance. In this mode, CM310 9 power is saved by significantly reduc ing the quiescent .





Part

CM3109

Description

2A Sink/Source Regulator



Feature


CM3109 2A Sink/Source Regulator for Fron t Side Bus and DDR Memory Bus Terminati on Features Ideal for both PC Front Sid e Bus and DDR memory VTT applications Sinks and sources 2A • Over curren t protection • Over temperature prote ction • Shutdown function www.DataShe et4U.com • Integrated power MOSFETs Excellent accuracy (0.5% of load reg ulation) • Minimum external co.
Manufacture

California Micro Devices

Datasheet
Download CM3109 Datasheet




 CM3109
CM3109
2A Sink/Source Regulator for Front Side Bus and
DDR Memory Bus Termination
Features
• Ideal for both PC Front Side Bus and DDR memory
VTT applications
• Sinks and sources 2A
• Over current protection
• Over temperature protection
www.DataSheet4U.cSohmutdown function
• Integrated power MOSFETs
• Excellent accuracy (0.5% of load regulation)
• Minimum external components
• 8 pin PSOP package
• Lead-free version available
Applications
• PC Front Side Bus termination regulator
• DDR Memory termination regulator
• Active termination buses
• Graphics card DDR memory termination
Product Description
The CM3109 is a sinking and sourcing regulator specif-
ically designed for series-parallel bus termination for
high speed chip set buses as well as DDR memory
systems. It can source and sink current up to 2A with
high accuracy of 0.5 %. The VTT output voltage is
selectable by VDDQSEL and FSBSEL pins. The
VDDQSEL pin controls whether the CM3109 is in DDR
memory mode with VTT = VDDQ/2, or in FSB mode. In
FSB mode, FSBSEL controls whether VTT is 1.225V or
1.45V. This allows the same chip to be used in two dif-
ferent circuits on PC motherboards that support both
Northwood and Prescott processors.
The CM3109 requires no external components to use
the GMCH Enable signal in Intel chipset or correspond-
ing signals for other chip sets when powering up the
PC. For the boards which support Suspend to RAM
(STR) functionality, CM3109 provides a shutdown (SD)
pin. When SD is set low, VTT will be in tri-state mode,
causing the output to go high impedance. In this mode,
CM3109 power is saved by significantly reducing the
quiescent current.
The CM3109 provides over current and over tempera-
ture protection. These features protect the chip from
excessive heating due to high current and high temper-
ature. The CM3109 is housed in an 8-pin PSOP pack-
age and is available with optional lead-free finishing.
Simplified Electrical
Schematic
SD
VCC VDDQSEL FSBSEL
Over Temp
Over Current
Reference
Output
Select
Driver
VDDQ
VTT
VSENSE
GND
© 2004 California Micro Devices Corp. All rights reserved.
01/15/04 430 N. McCarthy Blvd., Milpitas, CA 95035-5112 Tel: 408.263.3214
Fax: 408.263.7846 www.calmicro.com
1




 CM3109
CM3109
PACKAGE / PINOUT DIAGRAM
TOP VIEW
www.DataSheet4U.com
Note: This drawing is not to scale.
VDDQ
VTT
SD
VSENSE
18
27
GND
36
45
VCC
VDDQSEL
GND
FSBSEL
8-lead PSOP
PIN DESCRIPTIONS
LEAD(S)
NAME DESCRIPTION
1
VDDQ
Input Voltage VDDQ
2 VTT Outputs either 1.225V/1.45V FSB or VDDQ/2 DDR (See note 1)
3 SD Shutdown input
4 VSENSE Feedback voltage input
5 FSBSEL Select input for FSB output. Selects either VTT=1.225V or 1.45V.
6 GND GROUND
7 VDDQSEL Select input for DDR/FSB Output
8 VCC Power for control blocks
Note 1: Assumes VDDQ and VDDQSEL are tied together in DDR application.
Ordering Information
PART NUMBERING INFORMATION
Standard Finish
Leads
Package
Ordering Part
Number1
Part Marking
8
PSOP-8
CM3109-00SB
CM3109-00SB
Note 1: Parts are shipped in Tape & Reel form unless otherwise specified.
Lead-free Finish
Ordering Part
Number1
Part Marking
CM3109-00SH
CM3109-00SH
© 2004 California Micro Devices Corp. All rights reserved.
2 430 N. McCarthy Blvd., Milpitas, CA 95035-5112 Tel: 408.263.3214
Fax: 408.263.7846 www.calmicro.com
01/15/04




 CM3109
CM3109
Specifications
ABSOLUTE MAXIMUM RATINGS
PARAMETER
RATING
UNITS
VCC Operating Supply Voltage
7V
VDDQ Input Voltage
7V
Pin Voltages
VTT Output
www.DataSheet4U.comAny other pins
Storage Temperature Range
7
7
-40 to +150
V
V
°C
Operating Temperature Range
Ambient
Junction
-45 to +85
-45 to +150
°C
°C
Power Dissipation (See note 1)
Internally Limited
W
Note 1: These devices must be derated based on thermal resistance at elevated temperatures. The CM3109-xxSB/ must be der-
ated at θJA = 40°C/W . Please consult with factory for thermal evaluation assistance.
STANDARD OPERATING CONDITIONS
PARAMETER
VDDQ, VDDQ
Ambient Operating Temperature
COUT
VALUE
2.5
25
220 ±20%
UNITS
V
°C
μF
© 2004 California Micro Devices Corp. All rights reserved.
01/15/04 430 N. McCarthy Blvd., Milpitas, CA 95035-5112 Tel: 408.263.3214
Fax: 408.263.7846 www.calmicro.com
3




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