Pinout
Specifications| Output Current | 800 mA |
| Output Min | 0.80 Volt |
| Input Max Voltage | 5.5 Volt |
| Dropout Voltage | 0.115 Volt |
| Adjustable Output | Yes |
| Quiescent Current | 10 mA |
| On/Off Pin | Yes |
| Error Flag | No |
| RegType | LDO |
| Temperature Min | -40 deg C |
| Temperature Max | 125 deg C |
| Special Features | Dual Rail, Soft-Start |
| Output Max | 1.80 Volt |
| PowerWise | Yes |
| View Using Catalog |
DescriptionThe LP38851-ADJ is a high current, fast response regulator which can maintain output voltage regulation with extremely low 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 this device makes it suitable for use in powering DSP, Microcontroller Core voltages and Switch Mode Power Supply post regulators. The part is available in PSOP 8pin, TO-220 7pin, and TO-263 7-pin packages.
Dropout Voltage: 115 mV (typical) at 800 mA load current.
Low Ground Pin Current: 10 mA (typical) at 800 mA load current.
Soft-Start: Programmable Soft-Start time.
Precision ADJ Voltage: ±1.5% for TJ = 25°C, and ±2.0% for 0°C TJ +125°C, across all line and load conditions
Reliability Metrics
| Part Number |
Process |
EFR Reject |
EFR Sample Size |
PPM |
LTA Rejects |
LTA Device Hours |
FITS |
MTTF (Hours) |
| LP38851MR-ADJ |
CS065 |
2 |
34108 |
59 |
0 |
3862000 |
1 |
1095853045 |
| LP38851MRX-ADJ |
CS065 |
2 |
34108 |
59 |
0 |
3862000 |
1 |
1095853045 |
| LP38851S-ADJ |
CS065 |
2 |
34108 |
59 |
0 |
3862000 |
1 |
1095853045 |
| LP38851SX-ADJ |
CS065 |
2 |
34108 |
59 |
0 |
3862000 |
1 |
1095853045 |
| LP38851T-ADJ |
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.
Design Tools
| Title |
Size in Kbytes |
Date |
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| How to Power Sub-Micron CMOS Loads with an Efficient LDO |
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View |
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If you have trouble printing or viewing PDF file(s), see Printing Problems.
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More Application Notes
| Title |
Size in Kbytes |
Date |
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| AN-1560: Application Note 1560 LP38852MR-ADJ Evaluation Board |
280 Kbytes |
17-Mar-07 |
Download |
AN-1560 (Chinese): Application Note 1560 LP38852MR-ADJ Evaluation Board
|
397 Kbytes |
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640){this.height=this.height*640/this.width;this.width=640;}' border="0" alt=" Connection Diagram"> |
| AN-1479: Application Note 1479 LP38856S-1.2 Evaluation Board |
468 Kbytes |
3-Nov-06 |
Download |
AN-1479 (Chinese): Application Note 1479 LP38856S-1.2 Evaluation Board
|
230 Kbytes |
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640){this.height=this.height*640/this.width;this.width=640;}' border="0" alt=" Connection Diagram"> |
| AN-1504: Application Note 1504 LP38853S-ADJ Evaluation Board |
573 Kbytes |
13-Mar-07 |
Download |
AN-1504 (Chinese): Application Note 1504 LP38853S-ADJ Evaluation Board
|
285 Kbytes |
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640){this.height=this.height*640/this.width;this.width=640;}' border="0" alt=" Connection Diagram"> |
| AN-1480: Application Note 1480 LP38859S-1.2 Evaluation Board |
522 Kbytes |
3-Nov-06 |
Download |
AN-1480 (Chinese): Application Note 1480 LP38859S-1.2 Evaluation Board
|
228 Kbytes |
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640){this.height=this.height*640/this.width;this.width=640;}' border="0" alt=" Connection Diagram"> |
| AN-1815: Application Note 1815 LDOs Ease the Stress of Start-Up |
149 Kbytes |
23-Sep-08 |
Download |
If you have trouble printing or viewing PDF file(s), see Printing Problems.
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LP38851 Data Sheet
