Features: 5V output with in 1.4% over temperature (Agrade)
Easily programmed for snap-on/snap-off output
Guaranteed 250 mA output current
Extremely low quiescent current
Low Input-Output voltage required for regulation
Reverse battery protection
Extremely tight line and load regulation
Very low temperature coefficient
Current and thermal limiting
Error flag signals when output is out of regulationApplication-High-efficiency linear regulator
-Battery-powered regulatorPinout
Specifications
| Output Current |
250 mA |
| Output Min |
5 Volt |
| Input Min Voltage |
-20 Volt |
| Input Max Voltage |
30 Volt |
| Dropout Voltage |
0.47 Volt |
| Adjustable Output |
No |
| Quiescent Current |
0.15 mA |
| On/Off Pin |
Yes |
| Error Flag |
Yes |
| RegType |
LDO |
| Temperature Min |
-40 deg C |
| Temperature Max |
125 deg C |
| Output Max |
5 Volt |
| Output Voltage |
5 Volt |
| View Using Catalog |
DescriptionThe LP2957A 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 guaranteed at room temperature and over the full operating temperature range.
The LP2957 is available in the five-lead TO-220 and TO-263 packages.
Reliability Metrics
| Part Number |
Process |
EFR Reject |
EFR Sample Size |
PPM |
LTA Rejects |
LTA Device Hours |
FITS |
MTTF (Hours) |
| LP2957AIS |
SLM |
0 |
42786 |
0 |
0 |
3352500 |
2 |
951281028 |
| LP2957AISX |
SLM |
0 |
42786 |
0 |
0 |
3352500 |
2 |
951281028 |
| LP2957AIT |
SLM |
0 |
42786 |
0 |
0 |
3352500 |
2 |
951281028 |
Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.For more information on Reliability Metrics, please click here.
LP2957A Data Sheet
