二极管

USB

三极管

可控硅(晶闸管)

场效应管(MOSFET)

集成电路

连接器

LED系列产品

电感器

继电器

传感器

电容器

电阻器

保护器件

光电器件

压电晶体

开关原件

功率模块

特性

• 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 V_O Accuracy
  • 1.4% at 25°C
  • 2% Over Temperature
• Can Be Used as a Regulator or Reference
• Stable With Low ESR (>12 m Capacitors
• Current- and Thermal-Limiting Features
• LP2950 Only (3-Pin Package)
  • 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

DESCRIPTION/ORDERING INFORMATION

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 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 V_TAP pins together, the LP2951 outputs a fixed 5 V, 3.3 V, or 3 V (depending on the version). Alternatively, by leaving the SENSE and V_TAP 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 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 V_OUT drops by 6% of its nominal value for whatever reasons – due to a drop in V_IN, current limiting, or thermal shutdown.

The LP2950 and LP2951 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.