CM3121 Datasheet | California Micro Devices

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 .. 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 is in standby. The FAULT pin goes low whenever either of the two regulators goes into current limit mode, the input voltage drops too far or if overtemp occurs. Applications - DDR-I and DDR-II memory power for: - Set Top Boxes, DVD Players, Games - Digital TVs, Flat Panel Displays - Printers, Digital Projectors - Embedded systems - munications systems The CM3121 is available in a PSOP-8 package that has excellent thermal dissipation. It is available with optional lead-free finishing. . Typical Application Circuit 2.8V to 3.3V Circuit Schematic VDDQ REGULATOR VDDQ SENSE VDDQ VCC...