Features: Ideal for conversion from 1.8V or 1.5V inputs
Designed for use with low ESR ceramic capacitors
0.8V, 1.2V and 1.5V standard voltages available
Ultra low dropout voltage (115mV @ 1.5A typ)
1.5% initial output accuracy
Load regulation of 0.1%/A (typical)
30nA quiescent current in shutdown (typical)
Low ground pin current at all loads
Over temperature/over current protection
Available in 5 lead TO220 and TO263 packages
−40°C to +125°C junction temperature rangeApplicationASIC Power Supplies In:
- Desktops, Notebooks, and Graphics Cards, Servers
- Gaming Set Top Boxes, Printers and Copiers
Server Core and I/O Supplies
DSP and FPGA Power Supplies
SMPS Post-RegulatorPinout
Specifications
| Output Current |
1500 mA |
| Output Min |
1.2, 0.8, 1.5 Volt |
| Input Min Voltage |
1.315, 0.915, 1.615 Volt |
| Input Max Voltage |
5.5 Volt |
| Dropout Voltage |
0.115 Volt |
| Adjustable Output |
No |
| Quiescent Current |
32 mA |
| On/Off Pin |
Yes |
| Error Flag |
No |
| RegType |
LDO |
| Temperature Min |
-40 deg C |
| Temperature Max |
125 deg C |
| Output Voltage |
1.2, 0.8, 1.5 Volt |
| Output Max |
1.2, 0.8, 1.5 Volt |
| View Using Catalog |
| Lead Temp. (Soldering, 5 seconds) |
260°C |
| Storage Temperature |
-65°C to +150°C |
ESD Rating
Human Body Model (Note 3)
Machine Model (Note 9) |
2 kV
200V |
| Power Dissipation (Note 11) |
Internally limited |
| VIN Supply Voltage (Survival) |
−0.3V to +6V |
| VBIAS Supply Voltage (Survival) |
−0.3V to +7V |
| Shutdown Input Voltage (Survival) |
−0.3V to +7V |
| VADJ |
-0.3V to +6V |
| IOUT (Survival) |
Internally Limited |
| Output Voltage (Survival) |
−0.3V to +6V |
| Junction Temperature |
−40°C to +150°C |
DescriptionThe LP38842 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 architecture 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 and TO-263 packages.
Dropout Voltage: 115 mV (typ) @ 1.5A load current.
Quiescent Current: 30 mA (typ) at full load.
Shutdown Current: 30 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) |
| LP38842S-0.8 |
CS065 |
2 |
34108 |
59 |
0 |
3862000 |
1 |
1095853045 |
| LP38842S-1.2 |
CS065 |
2 |
34108 |
59 |
0 |
3862000 |
1 |
1095853045 |
| LP38842S-1.5 |
CS065 |
2 |
34108 |
59 |
0 |
3862000 |
1 |
1095853045 |
| LP38842SX-0.8 |
CS065 |
2 |
34108 |
59 |
0 |
3862000 |
1 |
1095853045 |
| LP38842SX-1.2 |
CS065 |
2 |
34108 |
59 |
0 |
3862000 |
1 |
1095853045 |
| LP38842SX-1.5 |
CS065 |
2 |
34108 |
59 |
0 |
3862000 |
1 |
1095853045 |
| LP38842T-0.8 |
CS065 |
2 |
34108 |
59 |
0 |
3862000 |
1 |
1095853045 |
| LP38842T-1.2 |
CS065 |
2 |
34108 |
59 |
0 |
3862000 |
1 |
1095853045 |
| LP38842T-1.5 |
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-1457: Application Note 1457 LP3884X-ADJ Evaluation Board |
431 Kbytes |
16-Jun-06 |
Download |
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LP38842 Data Sheet
