The LP2957 is a 5V micropower voltage regulator with electronic shutdown, error flag, very low quiescent current (150 µA typical at 1 mA load), and very low dropout voltage (470 mV typical at 250 mA load current). Output can be wired for snap-on/snap-off operation to eliminate transition voltage states where µP operation may be unpredictable. Output crowbar (50 mA typical pull-down current) will bring down the output quickly when the regulator snaps off or when the shutdown function is activated. The part has tight line and load regulation (0.04% typical) and low output temperature coefficient (20 ppm/°C typical). The accuracy of the 5V output is ensured at room temperature and over the full operating temperature range. The LP2957 is available in the five-lead TO-220 and DDPAK/TO-263 packages.
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View full reportTechnical parameters
| Power | |
|---|---|
| Dropout voltage (Vdo) (typ) (mV) | 470 |
| AC and DC characteristics | |
| Accuracy (%) | 2 |
| Noise (µVrms) | 320 |
| PSRR at 100 KHz (dB) | 14 |
| Environment and package | |
| Operating temperature range (°C) | -40 to 125 |
| Thermal resistance θJA (°C/W) | 60 |
| Other | |
| Features | Enable, Power good |
| Fixed output options (V) | 5 |
| Iout (max) (A) | 0.25 |
| Iq (typ) (mA) | 0.15 |
| Load capacitance (min) (µF) | 2.2 |
| Output options | Fixed Output |
| Rating | Catalog |
| Regulated outputs (#) | 1 |
| Vin (max) (V) | 30 |
| Vin (min) (V) | -20 |
| Vout (max) (V) | 5 |
| Vout (min) (V) | 5 |