Overview
The LP2951ACMM/NOPB is a micropower voltage regulator produced by Texas Instruments. It is part of the LP2951-N series, known for its very low quiescent current and low dropout voltage, making it ideal for battery-powered systems. This regulator offers high accuracy output voltage, extremely tight load and line regulation, and a very low temperature coefficient, which makes it suitable as a low-power voltage reference. The LP2951ACMM/NOPB is available in various packages, including SOIC, VSSOP, WSON, and PDIP, catering to different application requirements.
Key Specifications
| Parameter | Typical | Minimum | Maximum |
|---|---|---|---|
| Input Voltage Range | - | 2.3 V | 30 V |
| Output Voltage Options | - | 3 V, 3.3 V, 5 V (fixed), 1.24 V to 29 V (programmable) | - |
| Quiescent Current | 75 µA | - | - |
| Dropout Voltage | 40 mV (light loads), 380 mV (100 mA) | - | - |
| Output Current | - | - | 100 mA |
| Load Regulation | 0.05% | - | - |
| Line Regulation | 0.05% | - | - |
| Temperature Coefficient | Very low | - | - |
| ESD Rating | ±2500 V (HBM) | - | - |
| Package Options | SOIC, VSSOP, WSON, PDIP | - | - |
Key Features
- High Accuracy Output Voltage: Tight initial tolerance (0.5% typical) and extremely good load and line regulation (0.05% typical).
- Low Quiescent Current: Typical quiescent current of 75 µA, which prolongs battery life in battery-powered systems.
- Low Dropout Voltage: Typical dropout voltage of 40 mV at light loads and 380 mV at 100 mA.
- Programmable Output Voltage: Output voltage can be programmed from 1.24 V to 29 V using an external pair of resistors.
- Logic-Controlled Electronic Shutdown: The regulator can be switched on and off using the SHUTDOWN pin.
- Error Flag Output: Warns of low output voltage, useful for power-on reset.
- Current and Thermal Limiting: Internal protection circuitry includes foldback current limit and thermal shutdown).
- Stable With Low-ESR Output Capacitors: Stable operation with output capacitors having ESR from 10 mΩ to 6 Ω).
Applications
- High-Efficiency Linear Regulator: Suitable for applications requiring high efficiency and low power consumption).
- Regulator with Undervoltage Shutdown: Ideal for systems that need to shut down when the input voltage falls below a certain threshold).
- Low Dropout Battery-Powered Regulator: Optimized for battery-powered systems where low dropout voltage and low quiescent current are crucial).
- Snap-ON/Snap-OFF Regulator: Useful in applications where the regulator needs to be quickly turned on or off).
Q & A
- What is the typical quiescent current of the LP2951ACMM/NOPB?
The typical quiescent current is 75 µA.
- What is the dropout voltage of the LP2951ACMM/NOPB?
The typical dropout voltage is 40 mV at light loads and 380 mV at 100 mA).
- Can the output voltage of the LP2951ACMM/NOPB be programmed?
- What is the purpose of the SHUTDOWN pin on the LP2951ACMM/NOPB?
The SHUTDOWN pin allows the regulator to be switched on and off, entering a low quiescent current state when pulled low).
- What is the function of the error flag output on the LP2951ACMM/NOPB?
The error flag output warns of low output voltage and can be used for a power-on reset).
- What are the package options available for the LP2951ACMM/NOPB?
The regulator is available in SOIC, VSSOP, WSON, and PDIP packages).
- What is the ESD rating of the LP2951ACMM/NOPB?
The ESD rating is ±2500 V (HBM)).
- What is the typical load regulation of the LP2951ACMM/NOPB?
The typical load regulation is 0.05%).
- What is the typical line regulation of the LP2951ACMM/NOPB?
The typical line regulation is 0.05%).
- Is the LP2951ACMM/NOPB stable with low-ESR output capacitors?
