What is LP2951?
The LP2951 is a bipolar, low-dropout voltage regulator. The LP2951 regulator is usually used in applications that require a preset output voltage, which can be easily configured using two resistors. This device can provide low dropout regulation in a wide range of output voltage ranging from 1.235V to 30V. Therefore, it has become a popular choice for microcircuits that require micropower regulators that can provide up to 100 mA load current.
This blog provides you with a basic overview of the LP2951 voltage regulator, including its pin descriptions, functions and specifications, alternative products, etc., to help you quickly understand what LP2951 is.
Catalog
LP2951 Pinout
LP2951 Circuit
- LP2951 Circuit 1:12-V to 5-V Converter
- LP2951 Circuit 2
- LP2951 Circuit 3
- LP2951 Circuit 4: Regulator with Early Warning and Auxiliary Output
LP2951 Applications
- Applications with High-Voltage Input
- Power Supplies
LP2951 Features
- Wide Input Range: Up to 30 V
- Rated Output Current of 100 mA
- Low Dropout: 380 mV (Typ) at 100 mA
- Low Quiescent Current: 75 µA (Typ)
- Tight Line Regulation: 0.03% (Typ)
- Tight Load Regulation: 0.04% (Typ)
- High VO Accuracy
- 1.4% at 25°C
- 2% Over Temperature
- Can Be Used as a Regulator or Reference
- Stable With Low ESR (>12 mΩ) Capacitors
- Current- and Thermal-Limiting Features
- LP2950 Only (3-Pin)
- Fixed-Output Voltages of 5 V, 3.3 V, and 3 V
- LP2951 Only (8-Pin Package)
- Fixed- or Adjustable-Output Voltages:
- 5 V/ADJ, 3.3 V/ADJ, and 3 V/ADJ
- Low-Voltage Error Signal on Falling Output
- Shutdown Capability
- Remote Sense Capability for Optimal Output
- Regulation and Accuracy
LP2951 CAD/CAE symbols
LP2951 Functional Block Diagram
LP2951 Advantage
The LP2950 and LP2951 devices are bipolar, low-dropout voltage regulators that can accommodate a wide input supply-voltage range of up to 30 V. The easy-to-use, 3-pin LP2950 is available in fixed-output voltages of 5 V, 3.3 V, and 3 V. However, the 8-pin LP2951 device is able to output either a fixed or adjustable output from the same device. By tying the OUTPUT and SENSE pins together, and the FEEDBACK and VTAP pins together, the LP2951 device outputs a fixed 5 V, 3.3 V, or 3 V (depending on the version).
Alternatively, by leaving the SENSE and VTAP pins open and connecting FEEDBACK to an external resistor divider, the output can be set to any value between 1.235 V to 30 V. The 8-pin LP2951 device also offers additional functionality that makes it particularly suitable for battery-powered applications. For example, a logic-compatible shutdown feature allows the regulator to be put in standby mode for power savings. In addition, there is a built-in supervisor reset function in which the ERROR output goes low when VOUT drops by 6% of its nominal value for whatever reasons – due to a drop in VIN, current limiting, or thermal shutdown.
The LP2950 and LP2951 devices are designed to minimize all error contributions to the output voltage. With a tight output tolerance (0.5% at 25°C), a very low output voltage temperature coefficient (20 ppm typical), extremely good line and load regulation (0.3% and 0.4% typical), and remote sensing capability, the parts can be used as either low-power voltage references or 100-mA regulators.
LP2951 Package
| PART NUMBER | PACKAGE | BODY SIZE (NOM) |
| LP2951 | SOIC (8) | 4.90 mm x 3.90 mm |
| SON (8) | 3.00 mm x 3.00 mm |
LP2951 Specification
LP2951 Manufacturer
Texas Instruments Inc. (TI) is an American technology company that designs and manufactures semiconductors and various integrated circuits, which it sells to electronics designers and manufacturers globally. Its headquarters are in Dallas, Texas, United States. TI is one of the top ten semiconductor companies worldwide, based on sales volume. Texas Instruments’s focus is on developing analog chips and embedded processors, which accounts for more than 80% of their revenue. TI also produces TI digital light processing (DLP) technology and education technology products including calculators, microcontrollers and multi-core processors. To date, TI has more than 43,000 patents worldwide.
LP2951 Documents
Where to use LP2951
Both LP2950 and LP2951 feature low quiescent current and low dropout voltage (typical 50mV at light load and 380mV at 100mA). These devices are an excellent choice for use in battery powered application such as cordless telephones, radio control systems and portable computers.
