产品概览
LP2998MAX/NOPB from TI is a DDR termination regulator generating VTT = VDDQ/2 with 1A source/sink capability. +/-20mV accuracy. Supports DDR/DDR2/DDR3. Power-save mode for standby.
工作原理
Senses VDDQ via external resistor divider and generates VTT = VDDQ/2. Built-in error amplifier drives output stage to maintain VTT. Can source and sink current to terminate DDR bus. Power-save mode reduces quiescent current when VTT not needed.
Pin Description
| 针脚 | 名称 | 功能 |
|---|---|---|
| 1 | VIN | Input 2.2-5.5V |
| 2 | VDDQ | Sense input |
| 5 | VTT | Termination output |
| 7 | SAVE | Power save control |
应用
- DDR memory VTT supply
- DDR2/DDR3 bus termination
Alternative Models
| 制造商 | 部件编号 | 说明 |
|---|---|---|
| TI | TPS51200DRCR | Similar DDR term reg |