EV1320QI - 2 Amp Source/Sink High Efficiency VTT Converter for DDR2/DDR3/QDR and Low Voltage DDR4 Memory Termination Voltage Applications

With the continued proliferation of processors and ASICs that require increasing amounts of DDR2/DDR3/DDR4 memory for program and data store, memory power continues to be an area of growing importance. DDR memory implementations require two main supplies – a core supply (VDDQ) and a memory termination supply (VTT) with source/sink capability. The most prevalent solutions for the VTT termination power supply use a low drop out regulator (LDO). An LDO provides a small footprint, low noise and low cost but with poor efficiency and the associated heat often causing design issues in high density thermally sensitive applications. The other traditional design option uses a discrete source/sink DC-DC switching regulator solution with much better efficiency, but at the expense of larger PCB footprint and much higher solution cost.

The EV1320 is an ideal source/sink DDR termination converter offering excellent performance with low cost and a tiny solution footprint. EV1320 solutions deliver nearly 2 times the efficiency at or below the cost of commonly used VTT LDOs. The VTT converter accepts an input voltage of 0.95V to 1.8V. Multiple EV1320 devices may be placed in parallel to support larger DDR memory capacities (higher load requirements). EV1320 is a purpose-built VTT converter solution that complies with JEDEC specifications, in particular tracking accuracy and AC + DC requirements for supporting DDR2/DDR3/QDR and low-power DDR3/DDR4 VTT applications.

Product Highlights Ultra High Efficiency - nearly 2x improvement possible Smallest Footprint and Thin Profile High Reliability Simple Layout, No Inductor Required, Easy to Design

Features

• Source and Sink up to 2A
• Solution complies with JEDEC specifications for powering DDR2/3/QDR and low power DDR4 devices
• Operates directly from VDDQ; Low Vin from 0.95V to 1.8V
• Output VTT precisely tracks ½ VDDQ voltage
• Small 40mm2 solution area; with 0.55mm low profile
• No external inductor required
• Ultra high 96% efficiency
• Parallel up to 4 devices for 8A VTT load current
• Enable pin with output discharge to support S3 (suspend to RAM) mode
• Programmable soft start time.  Soft shutdown
• Thermal overload, over current, short circuit and under-voltage protection
• High reliability; 4.1 FITs; 28,200 years MTTF
• Fully RoHS compliant and Pb-free manufacturing line compatible

High Efficiency

Small Solution Footprint / Simple Layout

(consult datasheet for 1A & 2A options)