Features: Ultra low dropout voltage (100mV @ 0.8A typ)
Low ground pin current
Load regulation of 0.04%/A
60 nA typical quiescent current in shutdown
1.5% output accuracy (25?C)
TO-220, TO-263 packages
Over temperature/over current protection
-40 to +125 junction temperature rangeApplicationDSP Power Supplies
Server Core and I/O Supplies
PC Add-in-Cards
Local Regulators in Set-Top Boxes
Microcontroller Power Supplies
High Efficiency Power Supplies
SMPS Post-RegulatorsPinout
Specifications
| Output Current |
800 mA |
| Output Min |
1.8, 1.2, 1.5 Volt |
| Input Min Voltage |
1.9, 1.3, 1.6 Volt |
| Input Max Voltage |
5.5 Volt |
| Dropout Voltage |
0.1 Volt |
| Adjustable Output |
No |
| Quiescent Current |
4 mA |
| On/Off Pin |
Yes |
| Error Flag |
No |
| RegType |
LDO |
| Temperature Min |
-40 deg C |
| Temperature Max |
125 deg C |
| Output Voltage |
1.8, 1.2, 1.5 Volt |
| Output Max |
1.8, 1.2, 1.5 Volt |
| View Using Catalog |
Storage Temperature Range.......................................... -65 to +150
Lead Temp. (Soldering, 5 seconds)................................................ 260
ESD Rating
Human Body Model (Note 3) .............................................................2kV
Machine Model (Note 10) ................................................................200V
Power Dissipation (Note 2) .........................................Internally Limited
VIN Supply Voltage (Survival) ..............................................-0.3V to +6V
VBIASSupply Voltage (Survival)............................................ -0.3V to +7V
Shutdown Input Voltage (Survival)..................................... -0.3V to +7V
IOUT (Survival)............................................................. Internally Limited
Output Voltage (Survival) ....................................................-0.3V to +6V
Junction Temperature..................................................... -40 to +150
DescriptionThe LP3891 is a high current, fast response regulator which can maintain output voltage regulation with minimum input to output voltage drop. Fabricated on a CMOS process, the device operates from two input voltages: Vbias provides voltage to drive the gate of the N-MOS power transistor, while Vin is the input voltage which supplies power to the load. The use of an external bias rail allows the part to operate from ultra low Vin voltages. Unlike bipolar regulators, the CMOS architectutre consumes extremely low quiescent current at any output load current. The use of an N-MOS power transistor results in wide bandwidth, yet minimum external capacitance is required to maintain loop stability.
The fast transient response of these devices makes them suitable for use in powering DSP, Microcontroller Core voltages and Switch Mode Power Supply post regulators. The parts are available in TO-220, TO-263 and PSOP-8 packages.
Dropout Voltage: 100 mV (typ) @ 0.8A load current.
Ground Pin Current: 3 mA (typ) at full load.
Shutdown Current: 60 nA (typ) when S/D pin is low.
Precision Output Voltage: 1.5% room temperature accuracy.
Reliability Metrics
| Part Number |
Process |
EFR Reject |
EFR Sample Size |
PPM |
LTA Rejects |
LTA Device Hours |
FITS |
MTTF (Hours) |
| LP3891EMR-1.2 |
CS065 |
2 |
34108 |
59 |
0 |
3862000 |
1 |
1095853045 |
| LP3891EMR-1.5 |
CS065 |
2 |
34108 |
59 |
0 |
3862000 |
1 |
1095853045 |
| LP3891EMR-1.8 |
CS065 |
2 |
34108 |
59 |
0 |
3862000 |
1 |
1095853045 |
| LP3891EMRX-1.2 |
CS065 |
2 |
34108 |
59 |
0 |
3862000 |
1 |
1095853045 |
| LP3891EMRX-1.5 |
CS065 |
2 |
34108 |
59 |
0 |
3862000 |
1 |
1095853045 |
| LP3891EMRX-1.8 |
CS065 |
2 |
34108 |
59 |
0 |
3862000 |
1 |
1095853045 |
| LP3891ES-1.2 |
CS065 |
2 |
34108 |
59 |
0 |
3862000 |
1 |
1095853045 |
| LP3891ES-1.5 |
CS065 |
2 |
34108 |
59 |
0 |
3862000 |
1 |
1095853045 |
| LP3891ES-1.8 |
CS065 |
2 |
34108 |
59 |
0 |
3862000 |
1 |
1095853045 |
| LP3891ESX-1.2 |
CS065 |
2 |
34108 |
59 |
0 |
3862000 |
1 |
1095853045 |
| LP3891ESX-1.5 |
CS065 |
2 |
34108 |
59 |
0 |
3862000 |
1 |
1095853045 |
| LP3891ESX-1.8 |
CS065 |
2 |
34108 |
59 |
0 |
3862000 |
1 |
1095853045 |
| LP3891ET-1.2 |
CS065 |
2 |
34108 |
59 |
0 |
3862000 |
1 |
1095853045 |
| LP3891ET-1.5 |
CS065 |
2 |
34108 |
59 |
0 |
3862000 |
1 |
1095853045 |
| LP3891ET-1.8 |
CS065 |
2 |
34108 |
59 |
0 |
3862000 |
1 |
1095853045 |
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.
More Application Notes
| Title |
Size in Kbytes |
Date |
|
| AN-1219: Application Note 1219 LP3985 MicroSMD‐5 Evaluation Board Instruction |
36 Kbytes |
10-May-04 |
Download |
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|
LP3891 Data Sheet
