CM3212 Datasheet, PDF (1/11 Pages) ON Semiconductor – VTT Termination Voltage Regulator

CM3212
DDR VDDQ and VTT
Termination Voltage
Regulator
Product Description
The CM3212 is a dual−output low noise linear regulator designed to
meet SSTL−2 and SSTL−3 specifications for DDR−SDRAM V_DDQ
supply and termination voltage V_TT supply. With integrated power
MOSFETs the CM3212 can source up to 2 A of VDDQ continuous
current, and source or sink up to 2 A VTT continuous current. The
typical dropout voltage for VDDQ is 500 mV at 2 A load current.
The CM3212 provides excellent full load regulation and fast
response to transient load changes. It also has built−in over−current
limits and thermal shutdown at 170°C.
The CM3212 supports Suspend−To−RAM (STR) and ACPI
compliance with Shutdown Mode which tri−states VTT to minimize
quiescent system current.
The CM3212 is available in a space saving WDFN8 surface mount
packages. Low thermal resistance allows them to withstand high
power dissipation at 85°C ambient. The CM3212 can operate over the
industrial ambient temperature range of –40°C to 85°C.
Features
• Two Linear Regulators
• Maximum 2 A Current from VDDQ
• Source and Sink Up to 2 A VTT Current
• 1.7 V to 2.8 V Adjustable VDDQ Output Voltage
• 0.85 V to 1.4 V VTT Output Voltage (Tracking at 50% of VDDQ)
• Buffered VREF Output
• 500 mV Typical VDDQ Dropout Voltage at 2 A
• Excellent Load and Line Regulation, Low Noise
• Meets JEDEC DDR−I and DDR−II Memory Power Spec
• Linear Regulator Design Requires no Inductors and Has Low
External Component Count
• Integrated Power MOSFETs
• Dual Purpose ADJ/Shutdown Pin
• Enable VTT Pin for Sleep or Suspend to RAM Function
• Built−In Over−Current Limit and Thermal Shutdown for VDDQ
and VTT
• Fast Transient Response
• Low Quiescent Current
• These Devices are Pb−Free and are RoHS Compliant
http://onsemi.com
1
WDFN8
DE SUFFIX
CASE 511BH
MARKING DIAGRAM
CM321
020DE
CM321 202DE = CM3212−02DE
ORDERING INFORMATION
Device
CM3212−02DE
Package
WDFN8
(Pb−Free)
Shipping^†
3000/Tape & Reel
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specification
Brochure, BRD8011/D.
Applications
• DDR Memory and Active Termination Buses
• Desktop Computers, Servers
• Residential and Enterprise Gateways
• DSL Modems
• Routers and Switches
• DVD Recorders, LCD TV and STB
• 3D AGP Cards
© Semiconductor Components Industries, LLC, 2011
1
March, 2011 − Rev. 3
Publication Order Number:
CM3212/D