Compact DDR/QDR4 SRAM Regulator Operates From 3.3 to 15Vin

Compact DDR/QDR4 SRAM Regulator Operates From 3.3 to 15Vin
Linear Technology Corp.

Housed in a miniature, lightweight, ultrathin LGA package measuring 6.25 mm x 6.25 mm x 1.82 mm, the LTM4632, a triple output power module regulator drives the three voltage rails of new QDR4 and older DDR SRAM: VDDQ, VTT and VTTR (or VREF). The device can be soldered on the backside of the PCB. With one resistor and three capacitors it occupies 0.5 cm² (dual-sided) or 1 cm² (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 an 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 10 mA 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. Pricing starts at $7.35 each/1,000 for E-grade and $8.09 each/1,000 for I-grade. For more information, visit

Linear Technology Corp.
Milpitas, CA.

Contact Info

Company: Linear Technology Corp.
Country: United States (USA)
Phone number: 408-432-1900 x2419

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