Overview
The LP2998 linear regulator, produced by Texas Instruments, is designed to meet JEDEC SSTL-2 and JEDEC SSTL-18 specifications for the termination of DDR-SDRAM and DDR2 memory. Additionally, it supports DDR3 and DDR3L VTT bus termination with a minimum VDDQ of 1.35 V. This device features a high-speed operational amplifier to provide excellent response to load transients and can deliver 1.5 A continuous current with transient peaks up to 3 A. The LP2998 also includes a VSENSE pin for superior load regulation and a VREF output as a reference for the chipset and DIMMs.
Key Specifications
| Parameter | Minimum | Typical | Maximum | Unit |
|---|---|---|---|---|
| Operating Temperature Range | -40 | 125 | °C | |
| Junction Temperature Range | -40 | 125 | °C | |
| AVIN to GND | -0.3 | 6 | V | |
| PVIN to GND | -0.3 | AVIN V | V | |
| VDDQ to GND | -0.3 | 6 | V | |
| Continuous Output Current | 1.5 | A | ||
| Transient Peak Current | 3 | A | ||
| VREF Voltage (DDR I) | 1.135 | 1.158 | 1.185 | V |
| VTT Output Voltage (DDR I) | 1.120 | 1.159 | 1.190 | V |
| Thermal Shutdown Temperature | 150 | °C |
Key Features
- AEC-Q100 Test Guidance with results (SO PowerPAD-8): Device HBM ESD Classification Level H1C, Junction Temperature Range –40°C to 125°C
- Minimum VDDQ of 1.35 V
- Source and Sink Current capability
- Low Output Voltage Offset
- No External Resistors Required
- Linear Topology
- Suspend to Ram (STR) Functionality through active low shutdown (SD) pin
- Low External Component Count
- Thermal Shutdown
- VSENSE pin for superior load regulation and VREF output as a reference for the chipset and DIMMs
Applications
- DDR1, DDR2, DDR3, and DDR3L Termination
- Automotive Infotainment Systems
- Industrial and Medical PCs
- SSTL-18, SSTL-2, and SSTL-3 Termination
- HSTL Termination
- FPGA Devices
Q & A
- What is the primary function of the LP2998 linear regulator?
The LP2998 is designed to meet JEDEC SSTL-2 and JEDEC SSTL-18 specifications for the termination of DDR-SDRAM and DDR2 memory, and it also supports DDR3 and DDR3L VTT bus termination.
- What is the minimum VDDQ voltage supported by the LP2998?
The minimum VDDQ voltage supported is 1.35 V.
- What is the continuous output current capability of the LP2998?
The device can deliver a continuous output current of 1.5 A.
- What is the transient peak current capability of the LP2998?
The device can handle transient peaks up to 3 A.
- Does the LP2998 require external resistors for operation?
No, the LP2998 does not require external resistors for operation.
- What is the purpose of the VSENSE pin on the LP2998?
The VSENSE pin is used for superior load regulation.
- What is the function of the active low shutdown (SD) pin?
The active low shutdown (SD) pin provides Suspend to Ram (STR) functionality, tri-stating the VTT output while keeping VREF active.
- What are the thermal shutdown and junction temperature limits of the LP2998?
The thermal shutdown temperature is 150°C, and the junction temperature range is –40°C to 125°C.
- What are some common applications of the LP2998?
Common applications include DDR1, DDR2, DDR3, and DDR3L termination, automotive infotainment systems, industrial and medical PCs, and FPGA devices.
- Does the LP2998 have any specific ESD classification?
Yes, the LP2998 has an HBM ESD Classification Level H1C.
