CM3109-00SH CALMIRCO [California Micro Devices Corp], CM3109-00SH Datasheet

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CM3109-00SH

Manufacturer Part Number
CM3109-00SH
Description
2A Sink/Source Regulator for Front Side Bus and DDR Memory Bus Termination
Manufacturer
CALMIRCO [California Micro Devices Corp]
Datasheet
01/15/04
Features
Applications
© 2004 California Micro Devices Corp. All rights reserved.
Simplified Electrical
Schematic
Ideal for both PC Front Side Bus and DDR memory
V
Sinks and sources 2A
Over current protection
Over temperature protection
Shutdown function
Integrated power MOSFETs
Excellent accuracy (0.5% of load regulation)
Minimum external components
8 pin PSOP package
Lead-free version available
PC Front Side Bus termination regulator
DDR Memory termination regulator
Active termination buses
Graphics card DDR memory termination
TT
430 N. McCarthy Blvd., Milpitas, CA 95035-5112 ▲ Tel: 408.263.3214
applications
2A Sink/Source Regulator for Front Side Bus and
SD
DDR Memory Bus Termination
Over Temp
Over Current
Reference
V
CC
V
DDQ
GND
SEL FSBSEL
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 V
selectable by V
V
memory mode with V
FSB mode, FSBSEL controls whether V
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, V
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.
DDQ
Driver
Output
Select
SEL pin controls whether the CM3109 is in DDR
▲ Fax: 408.263.7846
V
DDQ
DDQ
TT
SEL and FSBSEL pins. The
= V
V
V
TT
TT
SENSE
DDQ
will be in tri-state mode,
/2, or in FSB mode. In
www.calmicro.com
TT
output voltage is
TT
CM3109
is 1.225V or
1

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CM3109-00SH Summary of contents

Page 1

... 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 ...

Page 2

... SEL are tied together in DDR application. DDQ PART NUMBERING INFORMATION Standard Finish Ordering Part 1 Number Part Marking CM3109-00SB CM3109-00SB SEL DDQ GND FSBSEL /2 DDR (See note 1) =1.225V or 1.45V. TT Lead-free Finish Ordering Part 1 Number CM3109-00SH ▲ Fax: 408.263.7846 ▲ www.calmicro.com CM3109 Part Marking CM3109-00SH 01/15/04 ...

Page 3

... DDQ Pin Voltages V Output TT Any other pins Storage Temperature Range Operating Temperature Range Ambient Junction Power Dissipation (See note 1) Note 1: These devices must be derated based on thermal resistance at elevated temperatures. The CM3109-xxSB/ must be der- θ °C/W ated PARAMETER DDQ DDQ ...

Page 4

... SEL = "0", FSBSEL = "1" DDQ 3.3V, VTT DDQ V SEL="0", FSBSEL="0" DDQ V SEL = "0", FSBSEL = "1" DDQ 0A < I < 2. < I < -2.0A VTT VTT ▲ Fax: 408.263.7846 CM3109 (SEE NOTE 1) MIN TYP MAX UNITS 2.2 2 2.2 2.5 V 5.5 μA 450 1.225 1.250 1 ...

Page 5

... Supply (V CC DDQ Figure 2. Load Regulation (Sink) © 2004 California Micro Devices Corp. All rights reserved. 430 N. McCarthy Blvd., Milpitas, CA 95035-5112 01/15/04 =2.5V) ▲ Tel: 408.263.3214 Figure 3. Reference Voltage with V Supply (V =2.5V) CC DDQ Figure 4. Load Regulation (Source) ▲ ▲ Fax: 408.263.7846 www.calmicro.com CM3109 5 ...

Page 6

... California Micro Devices Corp. All rights reserved. 430 N. McCarthy Blvd., Milpitas, CA 95035-5112 ▲ Tel: 408.263.3214 6 Figure 7. Over Current Limit (Source) Supply Voltage Figure 8. Output Voltage with V CC ▲ Fax: 408.263.7846 CM3109 Supply Voltage CC (V SEL = 0V, FSBSEL = 2.5V) DDQ ▲ www.calmicro.com ...

Page 7

... Typical Transient Characteristics (nominal conditions unless otherwise specified) Figure 10. Load Transient (0A to 1.5A Sink) © 2004 California Micro Devices Corp. All rights reserved. 430 N. McCarthy Blvd., Milpitas, CA 95035-5112 01/15/04 Figure 9. V Supply Current with CC Supply Voltage ▲ Tel: 408.263.3214 ▲ CM3109 Figure 11. Line Transient (0A to 1.5A Source) ▲ Fax: 408.263.7846 www.calmicro.com 7 ...

Page 8

... AMB D JA When a CM3109-00SB/SH (PSOP) is mounted on a double sided printed circuit board with two square inches of copper allocated for "heat spreading", the θ resulting is 40°C/W. Based on the over tempera- JA ture limit of 150°C with an ambient of 85°C, the avail- ...

Page 9

... If this average current is exceeded, the device will go over-temperature and the output will drop to 0V. The theoretical calculations of these relationships show the safe operating area of the CM3109 in the PSOP package. Thermal characteristics were measured using a double sided board with two square inches of copper area connected to the GND pins for " ...

Page 10

... It also helps dissipation to spread if the chip is positioned away from the edge of the PCB, and not near other heat dissipating devices. A good thermal link from the PCB pad to the rest of the PCB will ensure a thermal link from the CM3109 package to ambient, θ around 40°C/W. JA ▲ ...

Page 11

... SEL V DDQ TT VSENSE FSBSEL SD GND FSBSEL 0.1uF shutdown periods. The V the CM3109 is in Front Side Bus mode, and the BOOT- pin GMCH- SEL from the GMCH ensures the right Microprocessor TT V voltage is applied SEL DDQ "1" Open or "0" ...

Page 12

... Mechanical Details PSOP-8 Mechanical Specifications Dimensions for CM3109 devices packaged in 8-pin PSOP packages with an integrated heatslug are pre- sented below. For complete information on the PSOP-8 package, see the California Micro Devices PSOP-8 Package Infor- mation document. PACKAGE DIMENSIONS Package PSOP-8 Leads ...

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