PRELIMINARY
CM3205
DDR V
DDQ
and Termination Voltage Regulator
Features
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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
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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
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Fax: 408.263.7846
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www.cmd.com
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CALMIRCO [ CALIFORNIA MICRO DEVICES CORP ]
