Оконечная нагрузка шины памяти DDR/QDR

Analog Devices’ SRAM memory supplies and bus termination products are the ideal choice for DDR, QDR memory, SSTL logic, and HSTL interfaces for high speed FPGAs and processors, as well as other advanced portable microprocessor-based systems, that support high bandwidth applications such as PCIe, cloud-based systems, RAID, video processing, and networking. DDR and QDR memories require three voltage rails: bus supply voltage (VDD), bus termination voltage (VTT), and reference voltage (VREF). The bus termination voltage (VTT) and reference voltage (VREF) must track to ½ bus supply voltage (VDD), and the bus termination voltage (VTT) also requires a current sink and source function. Our portfolio of DDR/QDR memory bus termination products supports the powering needs of i.MX, PXA, ARM, OMAP, and other advanced microprocessors, offering voltage-mode and current-mode switching regulator topologies, very low input voltages, adjustable switching frequency operation, and ultra-thin packaging.
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DDR Memory/Bus Termination

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SortOrderPart#Number of OutputsVin
(min)
(V)
Vin
(max)
(V)
DDR Output Current
(A)
MonolithicFrequency
(typ)
(Hz)
CommentsPrice (1000+)
($ US)
1LTM4632 3 3.1 15 ±3A (x2), VTTR Yes 1M Ultrathin, Triple Output, Step-Down µModule Regulator for DDR-QDR4 Memory $7.35 (LTM4632EV#PBF)
2LTC3676Reference Circuit Available 7 2.7 5.5 ±1.5A, VTTR Yes 2.25M LTC3676-1 has ±1.5A DDR, VTTR ref $5.50 (LTC3676EUJ#PBF)
3LTC3634Reference Circuit Available 3 3.6 15 ±3A (x2), VTTR Yes 4M 15V Dual 3A Monolithic Step-Down Regulator for DDR Power $4.25 (LTC3634EUFD#PBF)
4LTC3618Reference Circuit Available 3 2.25 5.5 ±3A (x2), VTTR Yes 4M Dual 4MHz, +/-3A Synchronous Buck for DDR $4.10 (LTC3618EUF#PBF)
5LTC3617 2 2.25 5.5 ±6A, VTTR Yes 4M ±6A Monolithic Synchronous Step-Down for DDR $3.80 (LTC3617EUDD#PBF)
6LTC3876 3 4.5 38 20A, ±20A, VTTR No 2M Dual DC/DC Controller for DDR, Differential VDDQ Sense & +/-50mA VTT Reference $2.94 (LTC3876EUHF#PBF)
7LTC3615Reference Circuit Available 2 2.25 5.5 ±1.5A (x2) Yes 4M Selectable 0°/90°/180° (LTC3615) or 140°/180° (LTC3615-1) $3.95 (LTC3615EUF#PBF)
8LTC3614Reference Circuit Available 1 2.25 5.5 ±3A Yes 4M 4A, 4MHz Monolithic Synchronous Step-Down DC/DC Converter $3.45 (LTC3614EUDD#PBF)
9LTC3616Reference Circuit Available 1 2.25 5.5 ±3A Yes 4M 6A, 4MHz Monolithic Synchronous Step-Down DC/DC Converter $3.80 (LTC3616EUDD#PBF)
10LTC3612Reference Circuit Available 1 2.25 5.5 ±1.5A Yes 4M 3A, 4MHz Monolithic Synchronous Step-Down DC/DC Converter $3.10 (LTC3612EUDC#PBF)
11LTC3831-1 1 3 8 20A No 500k Synchronous Switching Regulator Controller for DDR, LTC3831-1 Vref 0.75V $2.90 (LTC3831EGN-1#PBF)
12LTC3776 2 2.75 9.8 4A, ±4A No 750k Generates VDDQ and VTT; VTT sinks/sources current. Optional spread spectrum $3.75 (LTC3776EGN#PBF)
13LTC3717-1 1 4 36 20A No 1.5M No RSENSE Step-Down Controller for DDR, Vout = 1/2Vref, LTC3717-1 Has Von Pin $3.15 (LTC3717EUH-1#PBF)
14LTC3718 1 1.5 36 20A No 1.5M Very low input voltage. provides its own 5V N-CH MOSFET gate drive $3.45 (LTC3718EG#PBF)
15LTC3413Reference Circuit Available 1 2.5 5.5 3A Yes 2M 3A, 2MHz Monolithic Synchronous Regulator for DDR/QDR Memory Termination $3.95 (LTC3413EFE#PBF)
16LTC3831 1 3 8 20A No 500k Synchronous Switching Regulator Controller for DDR, LTC3831 Vref 1.25V $2.90 (LTC3831EGN#PBF)
17LTC3717 1 4 36 20A No 1.5M No RSENSE Step-Down Controller for DDR, Vout = 1/2Vin $2.95 (LTC3717EGN#PBF)