CM3106
2 Amp Source/ Sink Bus Termination Regulator
Features
•
•
•
•
•
•
•
•
•
Ideal for DDR-I and DDR-II V
TT
applications
Sinks and sources 2.0A for DDR-I
Over current protection
Over temperature protection
Integrated power MOSFETs
Excellent accuracy (0.5% load regulation)
Pin and functionally compatible with LP2995
8-lead SOIC and PSOP packages
Lead-free versions available
Product Description
The CM3106 is a sinking and sourcing regulator specif-
ically designed for providing power to DDR memory
terminating resistors and companion chip set V
TT
power. The output voltage accurately tracks V
DDQ
/2.
The CM3106 can source and sink current up to 2A,
ideal for DDR-I memory systems, and 1.2A for DDR-II
systems, while maintaining a load regulation of 0.5% in
either application.
The CM3106 provides over current and over tempera-
ture protection which protects the device from exces-
sive heating due to high current and high temperature.
A shutdown capability using an external transistor
reduces power consumption and provides a high
impedance output.
The CM3106 is housed in both 8-lead SOIC and PSOP
packages and is available with optional lead-free finish-
ing.
Applications
•
•
•
Single and Dual Channel DDR Memory
Bus Termination
Active Termination Buses
Graphics Card Memory Termination
Simplified Electrical Schematic
AV
IN
V
DDQ
PV
IN
Over Temp
Over Current
Reference
50K
Driver
V
REF
OUT
IN
V
TT
50K
Buffer
V
SENSE
GND
© 2004 California Micro Devices Corp. All rights reserved.
02/02/04
430 N. McCarthy Blvd., Milpitas, CA 95035-5112
L
Tel: 408.263.3214
L
Fax: 408.263.7846
L
www.calmicro.com
1
CM3106
PACKAGE / PINOUT DIAGRAM
T
OP VIEW
NC
GND
V
SENSE
V
REF
1
2
3
4
8
7
6
5
TOP VIEW
V
TT
PV
IN
AV
IN
V
DDQ
NC
GND
V
SENSE
V
REF
1
2
3
4
8
7
GND
6
5
V
TT
PV
IN
AV
IN
V
DDQ
8-lead SOIC
Note: This drawing is not to scale.
8-lead PSOP
PIN DESCRIPTIONS
LEAD(S)
1
2
3
4
5
6
7
8
NAME
NC
GND
V
SENSE
V
REF
V
DDQ
AV
IN
PV
IN
V
TT
DESCRIPTION
No Connect
Ground
Feedback
Reference Output, VDDQ/2
V
DDQ
Input
Analog Input
Power Input
Output
Ordering Information
PART NUMBERING INFORMATION
Standard Finish
Ordering Part
Pins
8
8
Package
SOIC-8
PSOP-8
Number
1
CM3106-12SN
CM3106-12SB
Part Marking
CM310601S
CM3106-12SB
Lead-free Finish
Ordering Part
Number
1
CM3106-12SM
CM3106-12SH
Part Marking
CM3106-12SM
CM3106-12SH
Note 1: Parts are shipped in Tape & Reel form unless otherwise specified.
© 2004 California Micro Devices Corp. All rights reserved.
2
430 N. McCarthy Blvd., Milpitas, CA 95035-5112
L
Tel: 408.263.3214
L
Fax: 408.263.7846
L
www.calmicro.com
02/02/04
CM3106
Specifications
ABSOLUTE MAXIMUM RATINGS
PARAMETER
AV
IN
Operating Supply Voltage
V
DDQ
Input Voltage
Pin Voltages
V
TT
Output
Any other pins
ESD (HBM)
Storage Temperature Range
Operating Temperature Range
Ambient
Junction
Power Dissipation (see note 1)
RATING
7
7
7
7
±2000
-40 to +150
-40 to +85 (see note1)
-40 to +150
Internally Limited
UNITS
V
V
V
V
V
°C
°C
°C
W
Note 1: These devices must be derated based on thermal resistance at elevated temperatures. The device packaged in a 8-lead
SOIC leadframe must be derated at
θ
JA
= 151
°C/W
.
θ
JA
of the 8-lead PSOP is 40
°C/W.
STANDARD OPERATING CONDITIONS
PARAMETER
V
DDQ
AV
IN
PV
IN
Ambient Operating Temperature
C
TT
VALUE
2.5
2.5
2.5
0 to +70
220 +20%
UNITS
V
V
V
°C
µF
ELECTRICAL OPERATING CHARACTERISTICS
(SEE NOTE 1)
SYMBOL
V
IN
PARAMETER
Input Voltage Range
V
DDQ
AV
IN
AV
IN
Quiescent Current
Load Regulation
Output Reference Voltage
Output Offset from V
REF
V
REF
Output Impedance
V
DDQ
Input Impedance
V
TT
Current Limit
Shutdown Temperature
Thermal Hysteresis
-5µA < I
REF
< 5µA
I
VTT
= 0A
0A < I
VTT
< 2.0A or -2.0A < I
VTT
< 0A
V
DDQ
=2.5V, I
REF
=0A
1.225
-20
5
100
2.5
150
50
CONDITIONS
MIN
2.2
2.2
TYP
2.5
2.5
450
6.25
1.25
1.275
20
MAX
AV
IN
5.5
UNITS
V
V
µA
mV
V
mV
kΩ
kΩ
A
°C
°C
I
CC
V
RLOAD
V
REF
VOS
VTT
Z
REF
Z
VDDQ
I
LIM
T
DISABLE
T
HYST
Note 1: Operating Characteristics are over Standard Operating Conditions unless otherwise specified.
© 2004 California Micro Devices Corp. All rights reserved.
02/02/04
430 N. McCarthy Blvd., Milpitas, CA 95035-5112
L
Tel: 408.263.3214
L
Fax: 408.263.7846
L
www.calmicro.com
3
CM3106
Performance Information
Typical DC Characteristics (nominal conditions unless otherwise specified)
Figure 1. Output Voltage with
AV
IN
Supply (V
DDQ
=2.5V)
Figure 3. Reference Voltage with
AV
IN
Supply (V
DDQ
=2.5V)
Figure 2. Load Regulation (Sink)
Figure 4. Load Regulation (Source)
© 2004 California Micro Devices Corp. All rights reserved.
4
430 N. McCarthy Blvd., Milpitas, CA 95035-5112
L
Tel: 408.263.3214
L
Fax: 408.263.7846
L
www.calmicro.com
02/02/04
CM3106
Performance Information (cont’d)
Typical DC Characteristics (nominal conditions unless otherwise specified)
Figure 5. Over Current Limit (Sink)
Figure 7. Over Current Limit (Source)
Figure 6. AV
IN
Supply Current with Supply Voltage
© 2004 California Micro Devices Corp. All rights reserved.
02/02/04
430 N. McCarthy Blvd., Milpitas, CA 95035-5112
L
Tel: 408.263.3214
L
Fax: 408.263.7846
L
www.calmicro.com
5
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