CM3121

PRELIMINARY CM3121 Dual Linear Voltage Regulator for DDR-I and DDR-II Memory Features Fully integrated power solution for DDR memory ICs Ideal for DDR-I (2.5VDDQ) and DDR-II (1.8VDDQ) Lowest system cost and smallest footprint with just two external output capacitors Two linear regulators: -V regulator with a maximum output current www.DataSheet4U.com DDQ of 1.5A shared by DRAM and VTT regulator - source-sink VTT regulator with maximum output current of 0.5A (DDR-I) or 0.3A (DDR-II) Fault output indicates overcurrent condition in either regulator, under voltage lock-out and overtemperature condition Reverse current protection if host is powered off PSOP-8 package with integrated heat spreader Lead-free versions available Product Description The CM3121 provides an integrated power solution for DDR-I and DDR-II memory systems in consumer electronics applications. The CM3121 is ideal for a 2.8V to 3.6V supply for DDR-I memory and 2.2V to 2.8V for DDR-II memory. The CM3121 features two independent linear regulators for VDDQ and VTT supply regulation. The default voltage for VDDQ is 2.5V. The VDDQ regulator SENSE pin allows for setting VDDQ in the 2.2V to 2.8V range, or DDR-II memories from 1.7V to 1.9V. The VTT regulator output is always half the VDDQ voltage, derived internally. A capacitor should be connected to each of the two outputs. When EN_DDR is set high, the two DDR regulators are disabled to minimize overall system power dissipation such as when memory i...