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PRELIMINARY CM3205 DDR VDDQ and Termination Voltage Regulator
Features
• • • • • • • • • • • • • • • 5A continuous current from VDDQ 1.8V to 2.6V adjustable VDDQ output voltage 600-mV typical VDDQ dropout voltage at 5A VTT tracking at 50% of VDDQ Source and sink up to 2A VTT 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 VDDQ and VTT 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 regulator designed to meet SSTL-2 and SSTL-3 specifications for DDR-SDRAM VDDQ supply and termination voltage VTT supply. With integrated power MOSFET’s, the CM3205 can source up to 5A of VDDQ current, and source or sink up to 2A VTT current. The typical dropout voltage for VDDQ 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 D2PAK (TO263-5) and DPAK (TO252-5). Low thermal resistance (48°C/W) allows it to withstand 1.7W (1) dissipation at 85°C ambient. It can operate over the industrial 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 VREF
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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PRELIMINARY CM3205
Package Pinout
PACKAGE / PINOUT DIAGRAM
Top View
ADJSD
1 2 3 4 5
Top View
ADJSD
1 2 3 4 5
VDDQ
GND VIN VTT
VDDQ
GND VIN VTT
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 Number1 CM3205-00TN CM3205-00TP Part Marking
Note 1: Parts are shipped in Tape & Reel form unless otherwise specified.
Specifications
ABSOLUTE MAXIMUM RATINGS
PARAMETER VIN to GND Pin Voltages VDDQ ,VTT 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
DataSheet 4 U .com
www.DataSheet4U.com
PRELIMINARY CM3205
Specifications (cont’d)
ELECTRICAL OPERATING CHARACTERISTICS (SEE NOTE 1)
VIN = 3.3V, typical values are at TA = 25°C (unless otherwise specified) SYMBOL VIN VIN VUVLO IQ 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 = VREF IO = 10 mA to 5A VIN = 3.15V to 3.5V, IO = 10 mA VIN = 3.15V, IO = 5A VOUT = 1.25V VOUT = 1.25V IO = 0A to 2A IO = 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
VDDQ = 0V, VTT = 0V,
ADJSD = 3.3V (shutdown)
VDDQ = 2.5V, VTT = 1.25V, (no load)
VDDQ Regulator Output Current Limit VREF IBIAS VR LOAD VR LINE VDROPOUT VTT Regulator Output Current Limit (Source) Output Current Limit (Sink) VR VTTLOAD Load Regulation Reference Voltage Input Bias Current (IADJ) Load Regulation Line Regulation Dropout Voltage VOUT = 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
DataSheet 4 U .com
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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
.