µModule Regulator for DDR & QDR4 SRAM Operates from 3.3VIN to 15VIN, Fits in 0.5cm2 PCB

Apr 14 2016 -MILPITAS, CA
  • Linear Technology introduces the LTM4632, a triple output µModule (power module) regulator for powering all three voltage rails of the new QDR4 and older DDR SRAM: VDDQ, VTT and VTTR (or VREF). Housed in a miniature, lightweight, ultrathin LGA package (6.25mm × 6.25mm × 1.82mm), the LTM4632 can be soldered on the backside of the PCB, and with one resistor and three capacitors it occupies only 0.5cm2 (dual-sided) or 1cm2 (single-sided). Capable of delivering 3A VDDQ and ±3A VTT (=1/2*VDDQ) two LTM4632s in parallel can provide up to 6A per rail for larger memory banks. For more than 6A VDDQ, the LTM4632 can be configured with the LTM4630 to provide between 18A and 36A VDDQ for very large arrays of SRAMs. If VDDQ is already available, the LTM4632 can be configured to supply a two-phase single VTT output up to 6A.

    The LTM4632 can operate from a low input supply of 3.3V, as well as standard 5V and 12V inputs (up to 15V). Each of the two output voltages (VDDQ and VTT) range from 0.6V to 2.5V. The third output is a low noise 10mA buffered output for VTTR of the SRAM. Applications include PCIe, cloud-based systems, RAID, video processing and networking using these SRAMs: DDR/DDR-II/DDR-III/DDR4/QDR/QDR-II/QDR-II+ and QDR4.

    The LTM4632 contains a triple output DC/DC regulator, divide by 2 circuit, power switches, inductors and support components in a compact, ultrathin package. The LTM4632 is rated for operation from –40°C to 125°C. 1,000-piece pricing starts at $7.35 each for E-grade and $8.09 each for I-grade. For more information, visit www.linear.com/product/LTM4632.

    Summary of Features: LTM4632

    • Complete DDR/QDR4 Memory Power Solution in 1cm2 (Single-Sided PCB) or 0.5cm2 (Dual-Sided PCB)
    • 3A VDDQ + 3A VTT or Dual Phase Single 6A VTT
    • Wide Input Voltage Range: 3.6V (With VIN Tied to INTVCC) to 15V
    • 0.6V to 2.5V Output Voltage Range
    • ±1.5%, ±10mA Buffered VTTR = VDDQ/2 Output
    • External Frequency Synchronization
    • Ultrathin 6.25mm × 6.25mm × 1.82mm LGA Package

    Ultrathin µModule Regulator for DDR-QDR4 Memory Power


    Pricing shown is for budgetary use only and may differ due to local duties, taxes, fees and exchange rates.

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