Overview
The NCP51145MNTAG is a linear regulator designed by onsemi to supply a regulated VTT termination voltage for various DDR memory applications, including DDR-II, DDR-III, LPDDR-III, and DDR-IV. This regulator is capable of actively sourcing and sinking ±1.8 A peak currents while maintaining an output voltage accuracy of ±20 mV. The output termination voltage is regulated to track VDDQ / 2 using two external voltage divider resistors connected to the PVCC, GND, and VREF pins. The device incorporates a high-speed differential amplifier for ultra-fast response to line and load transients, along with features such as source/sink current limiting, soft-start, and on-chip thermal shutdown protection.
Key Specifications
| Parameter | Value |
|---|---|
| Input Voltage - Min | 1 V |
| Input Voltage - Max | 5.5 V |
| Minimum Operating Temperature | -40°C |
| Maximum Operating Temperature | +85°C |
| Output Current Capability | ±1.8 A (DDR-II), ±1.5 A (DDR-III), ±1.2 A (LPDDR-III and DDR-IV) |
| Output Voltage Accuracy | ±20 mV |
| Package Type | 8-DFN (2x2) |
| Packaging | Tape & Reel (TR) |
Key Features
- Supports DDR-II to DDR-IV memory applications with adjustable VTT termination voltage.
- High accuracy VTT output at full-load conditions.
- Fast transient response due to high-speed differential amplifier.
- Integrated power MOSFETs for efficient current handling.
- Source/sink current limiting and soft-start capabilities.
- Built-in thermal and current-limit protection.
- Stable operation using ceramic-only (very low ESR) capacitors.
- Shutdown feature for standby or suspend mode.
Applications
- DDR-II, DDR-III, LPDDR-III, and DDR-IV SDRAM termination voltage regulation.
- Motherboard, notebook, and VGA card memory termination.
- Set top box, digital TV, and printers.
Q & A
- What is the primary function of the NCP51145MNTAG?
The NCP51145MNTAG is designed to supply a regulated VTT termination voltage for DDR-II, DDR-III, LPDDR-III, and DDR-IV memory applications.
- What is the maximum input voltage for the NCP51145MNTAG?
The maximum input voltage is 5.5 V.
- What is the output current capability of the NCP51145MNTAG?
The device can source/sink up to ±1.8 A for DDR-II, ±1.5 A for DDR-III, and ±1.2 A for LPDDR-III and DDR-IV.
- What type of package does the NCP51145MNTAG come in?
The device is packaged in an 8-DFN (2x2) package.
- What is the operating temperature range for the NCP51145MNTAG?
The operating temperature range is from -40°C to +85°C.
- Does the NCP51145MNTAG have built-in protection features?
Yes, it includes thermal and current-limit protection, as well as soft-start capabilities.
- Can the NCP51145MNTAG be used in low-power applications?
Yes, it supports low-power DDR-3LP applications.
- How does the NCP51145MNTAG regulate the output termination voltage?
The output termination voltage is regulated to track VDDQ / 2 using two external voltage divider resistors connected to the PVCC, GND, and VREF pins.
- What types of capacitors are recommended for stable operation of the NCP51145MNTAG?
Ceramic-only (very low ESR) capacitors are recommended for stable operation.
- Does the NCP51145MNTAG have a shutdown feature?
Yes, it has a shutdown feature for standby or suspend mode.
