DDR VDDQ and Termination Voltage Regulator

Features

• Two linear regulators -Maximum 2A current from VDDQ -Source and sink up to 2A VTT current

• 1.7V to 2.8V adjustable VDDQ output voltage

• 500mV typical VDDQ dropout voltage at 2A

• VTT tracking at 50% of VDDQ

• Excellent load and line regulation, low noise

• Fast transient response

• Meet 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

• Built-in over-current limit with short-circuit foldback and thermal shutdown for VDDQ and VTT

• Fast transient response

• 5mA quiescent current

• TDFN-8 and SOIC-8 packages for high performance thermal dissipation and easy PC board layout

• Optional RoHS Compliant Lead-free packaging

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

Product Description

The CM3202 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 CM3202 can source up to 2A of VDDQ current, and source or sink up to 2A VTT current. The typical dropout voltage for VDDQ is 500 mV at 2A load current.

The CM3202 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 CM3202 is packaged in an easy-to-use TDFN-8 and SOIC-8. Low thermal resistance (55°C/W) allows it to withstand 1.55W (1) dissipation at 85°C ambient. It can operate over the industrial ambient temperature range of –40°C to 85°C.

Note⁽¹⁾ : If TDFN-8 is mounted on a double-sided printed circuit board with two square inches of copper area, it can to withstand 2W dissipation at 85°C ambient then.

ABSOLUTE MAXIMUM RATINGS

Typical Application

PACKAGE / PINOUT DIAGRAM

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