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 VTAP 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 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.
| Output options | Adjustable Output, Fixed Output |
| Iout (max) (A) | 0.1 |
| Vin (max) (V) | 30 |
| Vin (min) (V) | 2 |
| Vout (max) (V) | 29 |
| Vout (min) (V) | 1.2 |
| Fixed output options (V) | 3, 3.3, 5 |
| Noise (µVrms) | 160 |
| Iq (typ) (mA) | 0.075 |
| Thermal resistance θJA (°C/W) | 52, 97 |
| Rating | Catalog |
| Load capacitance (min) (µF) | 1 |
| Regulated outputs (#) | 1 |
| Features | Enable, Power good |
| Accuracy (%) | 3 |
| PSRR at 100 KHz (dB) | 57 |
| Dropout voltage (Vdo) (typ) (mV) | 380 |
| Operating temperature range (°C) | -40 to 125 |
| SOIC (D) | 8 | 29.4 mm² 4.9 x 6 |
| WSON (DRG) | 8 | 9 mm² 3 x 3 |
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