Overview
The LP2951CDR2 is a micropower low dropout (LDO) linear voltage regulator produced by onsemi. It is designed to maintain proper regulation with an extremely low input-to-output voltage differential. This device features a very low quiescent bias current of 75 µA and is capable of supplying output currents in excess of 100 mA. The LP2951CDR2 includes several key features such as an Error Output, programmable output voltage, and a Shutdown input, making it versatile for various applications.
Key Specifications
| Characteristic | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Output Voltage (5.0 V Versions) | 4.950 | 5.000 | 5.050 | V |
| Output Voltage (3.3 V Versions) | 3.267 | 3.300 | 3.333 | V |
| Output Voltage (3.0 V Versions) | 2.967 | 3.000 | 3.033 | V |
| Quiescent Bias Current | 75 | µA | ||
| Input-to-Output Voltage Differential | 50 mV at 100 mA | 380 mV at 100 mA | mV | |
| Output Current | 100 | mA | ||
| Operating Ambient Temperature Range | -40 | 125 | °C | |
| Output Capacitor for Stability | 1.0 | µF |
Key Features
- Low Quiescent Bias Current: 75 µA, which helps in extending the battery life in battery-powered devices.
- Low Input-to-Output Voltage Differential: 50 mV at 100 mA and 380 mV at 100 mA, ensuring efficient voltage regulation.
- Programmable Output Voltage: Can be preset to 5.0 V, 3.3 V, or 3.0 V, or programmed from 1.25 V to 29 V using a resistor divider and access to the Error Amplifier feedback input.
- Error Output: Signals an out-of-regulation condition or can be used as a microprocessor power-on reset.
- Shutdown Input: Allows a logic level signal to turn-off or turn-on the regulator output.
- Internal Current and Thermal Limiting: Provides protection against overcurrent and overheating conditions.
- Tight Line and Load Regulation: Ensures stable output voltage under varying input and load conditions.
- Minimal Output Capacitor Requirement: Only a 1.0 µF output capacitor is required for stability.
Applications
- Battery-Powered Computer and Consumer Equipment: Ideal for extending the useful battery life.
- Industrial Equipment: Suitable for applications requiring low power consumption and high efficiency.
- Automotive and Avionics: Used in applications such as RADAR and other automotive systems.
- Logistics Robot CPU Boards and Optical Line Cards: Applicable in various industrial and communication systems.
Q & A
- What is the typical quiescent bias current of the LP2951CDR2?
The typical quiescent bias current is 75 µA.
- What is the maximum output current of the LP2951CDR2?
The maximum output current is 100 mA.
- What are the preset output voltage options for the LP2951CDR2?
The output voltage can be preset to 5.0 V, 3.3 V, or 3.0 V, or programmed from 1.25 V to 29 V.
- What is the purpose of the Error Output feature in the LP2951CDR2?
The Error Output can signal an out-of-regulation condition or be used as a microprocessor power-on reset.
- How does the Shutdown input feature work in the LP2951CDR2?
The Shutdown input allows a logic level signal to turn-off or turn-on the regulator output.
- What is the required output capacitor for stability in the LP2951CDR2?
Only a 1.0 µF output capacitor is required for stability.
- What are the operating temperature ranges for the LP2951CDR2?
The operating ambient temperature range is from -40°C to +125°C.
- What types of applications are the LP2951CDR2 suitable for?
It is suitable for battery-powered computer, consumer, and industrial equipment, as well as automotive and avionics applications.
- Does the LP2951CDR2 have internal protection features?
Yes, it has internal current and thermal limiting protection.
- What is the significance of the 'A' suffix in the LP2951CDR2?
The 'A' suffix devices feature an initial output voltage tolerance of ±0.5%.
