PRELIMINARY
CM3205
DDR V
DDQ
and Termination Voltage Regulator
Features
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
5A continuous current from V
DDQ
1.8V to 2.6V adjustable V
DDQ
output voltage
600
-
mV typical
V
DDQ
dropout voltage at 5A
V
TT
tracking at 50% of V
DDQ
Source and sink up to 2A V
TT
current
Excellent load and line regulation, low noise
Fast transient response
Meets JEDEC DDR-I SDRAM power spec.
Linear regulator design requires no inductors and
has low external component count
Integrated power MOSFETs
Dual purpose ADJ/Shutdown pin
Built-in over-current limit with short-circuit foldback
and thermal shutdown for V
DDQ
and V
TT
5mA quiescent current
TO252 andTO263 packages for high performance
thermal dissipation and easy PC board layout
Optional RoHS Compliant Lead-free packaging
Product Description
The CM3205 is a dual-output, low noise linear regula-
tor designed to meet SSTL-2 and SSTL-3 specifica-
tions for DDR-SDRAM V
DDQ
supply and termination
voltage V
TT
supply. With integrated power MOSFET’s,
the CM3205 can source up to 5A of V
DDQ
current, and
source or sink up to 2A V
TT
current. The typical drop-
out voltage for V
DDQ
is 600-mV at 5A load current.
The CM3205 provides fast response to transient load
changes. Load regulation is excellent, less than 1%,
from no load to full load. It also has built-in over-current
limits and thermal shutdown at 170°C.
The CM3205 is packaged in an easy-to-use 5-pin
D
2
PAK (TO263-5) and DPAK (TO252-5). Low thermal
resistance (48°C/W) allows it to withstand 1.7W
(1)
dis-
sipation at 85°C ambient. It can operate over the indus-
trial ambient temperature range of –40°C to 85°C.
Applications
•
•
•
•
•
•
•
•
DDR memory and active termination buses
Desktop Computers, Servers
Residential and Enterprise Gateways
DSL Modems
Routers and Switchers
DVD recorders
3D AGP cards
LCD TV and STB
Typical Application
2.50V , 5A
VDDQ
VDDQ
CM3205
ADJSD
VDDQ
GND
VTT
VIN
C hip
S et
DL0
RT0
DLn
RTn
3.3V
1
2
3
4
5
REF
Memory
680u
4.7u
887
S/D
845
4.7u
4.7u
680u
V
REF
DDR
1.25V , 2.5A
680u
1k
1u
©
2006 California Micro Devices Corp. All rights reserved.
05/08/06
490 N. McCarthy Blvd., Milpitas, CA 95035-5112
l
Tel: 408.263.3214
l
Fax: 408.263.7846
l
www.cmd.com
1
PRELIMINARY
CM3205
Package Pinout
PACKAGE / PINOUT DIAGRAM
Top View
ADJSD
1
2
3
4
5
Top View
ADJSD
1
2
3
4
5
V
DDQ
GND
V
IN
V
TT
V
DDQ
GND
V
IN
V
TT
5-Lead TO-263-5 Package
CM3205-00TN
Note: This drawing is not to scale.
5-Lead TO-252-5 Package
CM3205-00TP
Ordering Information
PART NUMBERING INFORMATION
Lead-free Finish
Pins
5
5
Package
TO-263-5
TO-252-5
Ordering Part Number
1
CM3205-00TN
CM3205-00TP
Part Marking
Note 1: Parts are shipped in Tape & Reel form unless otherwise specified.
Specifications
ABSOLUTE MAXIMUM RATINGS
PARAMETER
V
IN
to GND
Pin Voltages
V
DDQ
,V
TT
to GND
ADJSD to GND
Storage Temperature Range
Operating Temperature Range
Lead Temperature (Soldering, 10s)
RATING
[GND - 0.3] to +6.0
[GND - 0.3] to +6.0
[GND - 0.3] to +6.0
-65 to +150
-40 to +85
300
UNITS
V
V
V
°C
°C
°C
©
2006 California Micro Devices Corp. All rights reserved.
2
490 N. McCarthy Blvd., Milpitas, CA 95035-5112
l
Tel: 408.263.3214
l
Fax: 408.263.7846
l
www.cmd.com
05/08/06
PRELIMINARY
CM3205
Specifications (cont’d)
ELECTRICAL OPERATING CHARACTERISTICS
(SEE NOTE 1)
V
IN
= 3.3V, typical values are at T
A
= 25°C (unless otherwise specified)
SYMBOL
VIN
V
IN
V
UVLO
I
Q
Supply Voltage Range
Under-voltage Lockout
UVLO Hysterisis
Quiescent Current
All outputs are no load
3.15
2.4
3.30
2.7
100
3
5
6.0
1.203
VADJSD = V
REF
I
O
= 10 mA to 5A
V
IN
= 3.15V to 3.5V, I
O
= 10 mA
V
IN
= 3.15V, I
O
= 5A
V
OUT
= 1.25V
V
OUT
= 1.25V
I
O
= 0A to 2A
I
O
= 0A to -2A
Over Temperature Protection
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
2
2
8.0
1.215
30
1
0.5
600
2.5
2.5
1
1
170
50
1.227
200
3.50
2.9
V
V
mV
mA
mA
A
V
nA
%
%
mV
A
A
%
%
°C
°C
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNIT
S
V
DDQ
= 0V, V
TT
= 0V,
ADJSD = 3.3V (shutdown)
V
DDQ
= 2.5V, V
TT
= 1.25V, (no load)
V
DDQ
Regulator
Output Current Limit
V
REF
I
BIAS
V
R LOAD
V
R LINE
V
DROPOUT
V
TT
Regulator
Output Current Limit (Source)
Output Current Limit (Sink)
V
R VTTLOAD
Load Regulation
Reference Voltage
Input Bias Current (I
ADJ
)
Load Regulation
Line Regulation
Dropout Voltage
V
OUT
= 2.5V
©
2006 California Micro Devices Corp. All rights reserved.
05/08/06
490 N. McCarthy Blvd., Milpitas, CA 95035-5112
l
Tel: 408.263.3214
l
Fax: 408.263.7846
l
www.cmd.com
3
PRELIMINARY
CM3205
Typical Operating Curves
VTT vs. VDDQ
1.65
1.55
1.45
2.505
1.35
1.25
1.15
1.05
0.95
0.85
0.75
1.5
1.75
2
2.25
2.5
2.75
3
3.25
2.49
-40 -20
0
20
40
60
80 100 120 140
o
VDDQ vs. Temperature
2.51
VDDQ (V)
VTT (V)
2.5
2.495
VDDQ (V)
Temperature C
VDDQ vs. Load Current
3
2.5
600
VDDQ Dropout vs. IDDQ
Dropout Voltage (mV)
500
400
300
200
100
0
VDDQ (V)
2
1.5
1
0.5
0
0
2
4
6
8
10
Ta=25 oC
Vin=3.3V
Ta = 25
o
C
VDDQ=2.5V
0
1
2
3
4
5
IDDQ (A)
IDDQ (A)
VTT vs. Load Current
2.5
Startup into Full Load
Vin
2.0
UVLO
VTT (V)
1.5
1.0
0.5
0.0
-4
-2
0
2
4
VDDQ
Sink
Source
VTT
1V/div
1ms/div
ITT (A)
©
2006 California Micro Devices Corp. All rights reserved.
4
490 N. McCarthy Blvd., Milpitas, CA 95035-5112
l
Tel: 408.263.3214
l
Fax: 408.263.7846
l
www.cmd.com
05/08/06
PRELIMINARY
CM3205
Typical Operating Characteristics
VDDQ Transient Response
VTT Transient Response
V
DDQ
V
TT
I
OUT
V
IN
= 3.3V
I
OUT
Step: 10mA ~ 3A
I
OUT
V
IN
= 3.3V
I
OUT
Step: -2.5A ~ +2.5A
Pin Descriptions
PIN DESCRIPTIONS
PIN(S)
NAME
DESCRIPTION
This pin is for V
DDQ
output voltage adjustment. The V
DDQ
output voltage is set using an
external resistor divider connected to ADJSD. The output voltage is determined by the
following formula:
R1 + R2
-
V
DDQ
= 1.215V
×
--------------------
R1
1
ADJSD
where R1 is the ground-side resistor and R2 is the upper resistor of the divider.
Connect these resistors to the V
DDQ
output at the point of regulation.
In addition, this input functions as a shutdown pin. Apply a voltage higher than V
IN
-1.2V
to this pin to simultaneously shutdown both V
DDQ
and V
TT
outputs. The outputs are
restored when the voltage on this pin falls below V
IN
-1.2V. A low-leakage diode in
series with the shutdown input signal is recommended to avoid interference with the
voltage adjustment setting.
2
3
4
5
V
DDQ
GND
V
IN
V
TT
V
DDQ
regulator output voltage pin.
GROUND reference pin. The back tab is also ground and serves as the package
heatsink. It should be soldered to the circuit board copper to remove excess heat from
the IC.
Input voltage pin, typically 3.3V from the power supply.
V
TT
regulator output voltage pin, which is preset to 50% of V
DDQ
.
©
2006 California Micro Devices Corp. All rights reserved.
05/08/06
490 N. McCarthy Blvd., Milpitas, CA 95035-5112
l
Tel: 408.263.3214
l
Fax: 408.263.7846
l
www.cmd.com
5
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