Overview
The NCP5208DR2, produced by onsemi, is a linear regulator specifically designed for the active termination of DDR-I/II SDRAM. This device is optimized for applications requiring precise voltage regulation and high current sourcing and sinking capabilities. It operates from a single supply voltage as low as 1.7 V and is capable of sourcing and sinking current up to 1.5 A with an output voltage regulated to within ±3%. The NCP5208DR2 features integrated power MOSFETs, a separate voltage feedback pin for superior load regulation, and protective features such as soft-start, current limits, and thermal shutdown. It is housed in a low-profile SOIC-8 package, making it suitable for space-constrained designs.
Key Specifications
| Characteristic | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Analog Supply Input (AVIN) | 1.7 | 5.5 | V | ||
| Power Supply Input (PVIN) | 1.7 | AVIN | V | ||
| Termination Voltage Output (VTT) | AVIN = PVIN = VDDQ = 2.5 V, IVTT = –1.5 A to 1.5 A | 1.215 | 1.250 | 1.285 | V |
| Load Regulation | VDDQ = 1.8 V, IVTT = 0 to +0.6 A | ±3% | % | ||
| Operating Junction Temperature Range | -10 | 150 | °C | ||
| Operating Ambient Temperature Range | 0 | 70 | °C | ||
| Thermal Resistance, Junction-to-Air | SOIC-8 Package | 151 | °C/W |
Key Features
- Supports both DDR-I and DDR-II SDRAM requirements
- Single supply voltage operation as low as 1.7 V
- Integrated power MOSFETs
- Few external components needed
- Source and sink current up to 1.5 A
- Load regulation within ±3%
- Source and sink current limits
- Open-drain VTT OK (POK) pin for system monitoring
- Shutdown pin to tri-state the regulator output for Suspend To RAM (STR) state
- Thermal shutdown with hysteresis
- Housed in a low-profile SOIC-8 package
- Pb-free package available
Applications
- DDR termination voltage
- Active bus termination (SSTL-2, SSTL-3)
The NCP5208DR2 is highly integrated and typically requires only an input capacitor, an output capacitor, and a pull-up resistor for the power OK output. It is designed to provide a precise termination voltage that tracks the mid-point of the logic voltage level closely, making it suitable for various memory and bus termination applications.
Q & A
- What is the primary function of the NCP5208DR2?
The primary function of the NCP5208DR2 is to provide a termination voltage for DDR-I/II SDRAM and active bus termination applications.
- What is the minimum operating supply voltage for the NCP5208DR2?
The minimum operating supply voltage for the NCP5208DR2 is 1.7 V.
- How much current can the NCP5208DR2 source and sink?
The NCP5208DR2 can source and sink current up to 1.5 A.
- What is the load regulation accuracy of the NCP5208DR2?
The load regulation accuracy of the NCP5208DR2 is within ±3%.
- What protective features does the NCP5208DR2 include?
The NCP5208DR2 includes protective features such as soft-start, source/sink current limits, and thermal shutdown.
- What is the purpose of the VTT OK (POK) pin?
The VTT OK (POK) pin is used for system monitoring and indicates when the VTT voltage is in regulation.
- How does the shutdown pin function?
The shutdown pin can be used to tri-state the regulator output for Suspend To RAM (STR) state by pulling it to ground.
- What is the thermal shutdown temperature for the NCP5208DR2?
The thermal shutdown temperature for the NCP5208DR2 is typically 135°C.
- What package type is the NCP5208DR2 available in?
The NCP5208DR2 is available in a SOIC-8 package.
- Is the NCP5208DR2 Pb-free?
Yes, the NCP5208DR2 is available in a Pb-free package.
