LTC3776EUF
Linear Technology
2-PHASE DUAL STEP-DOWN CONVERTER FOR DDR/QDR MEMORY TERMINATION LTC3776EUF
Design DocumentAnalog
DC829A Demonstration Circuit for the LTC3776 Dual Step-Down Converter
A 2-phase dual step-down DC/DC converter for DDR/QDR memory termination using the LTC3776EUF, supporting 2.75V-8V input and dual outputs of 2.5V and 1.25V.
Overview
The DC829A demonstration circuit features the LTC3776EUF controller, providing a high-efficiency 2-phase dual synchronous step-down solution specifically for DDR/QDR memory termination. It operates from an input range of 2.75V to 8V and delivers two outputs: 2.5V at up to 5A and 1.25V with ±5A symmetrical source/sink capability. The LTC3776 uses MOSFET VDS sensing to eliminate the need for sense resistors, and out-of-phase operation to reduce input ripple current. The board supports adjustable switching frequencies from 300kHz to 750kHz, external synchronization, and an optional spread spectrum mode for reduced EMI.
Use Cases
- DDR/QDR memory termination power supply
- Point-of-load DC/DC conversion
- Symmetrical source/sink voltage regulation
- High-efficiency battery-powered electronics
Topics
LTC3776EUF
DC829A
DDR memory termination
QDR memory termination
step-down converter
dual synchronous converter
2-phase DC/DC
MOSFET VDS sensing
Analog Devices
Linear Technology
Referenced Parts
| LTC3776EUF | Linear Technology | 2-PHASE DUAL STEP-DOWN CONVERTER FOR DDR/QDR MEMORY TERMINATION LTC3776EUF |