LP38856 - 3A Fast-Response High-Accuracy LDO Linear Regulator with Enable from the PowerWise® Family
Datasheet Packaging Samples & Pricing Eval. Boards Reliability Design Tools Application Notes Knowledge Base

Features
Standard VOUT values of 0.8V and 1.2V
Wide VBIAS Supply operating range of 3.0V to 5.5V
Stable with 10 µF ceramic capacitors
Dropout voltage of 240 mV (typical) at 3A load current
Precision Output Voltage across all line and load conditions:
±1.0% for TJ = 25°C
±2.0% for 0°C TJ +125°C
±3.0% for -40°C TJ +125°C
Over-Temperature and Over-Current protection
Available in 5 lead TO-220 and TO-263 packages
Custom VOUT values between 0.8V and 1.2V are available
-40°C to +125°C Operating Temperature Range

General Description


The LP38856 is a high-current, fast-response regulator which can maintain output voltage regulation with an extremely low input to output voltage drop. More...


Applications


ASIC 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-Regulator
  Typical Application
*click for larger image


ParametersValues
Output Current 3000 mA
Output Min 1.2, 0.8 Volt
Input Min Voltage 1.55, 1.15 Volt
Input Max Voltage 5.5 Volt
Dropout Voltage 0.240 Volt
Adjustable Output No
Quiescent Current 10 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 Volt
Output Max 1.2, 0.8 Volt
PowerWise Yes


Typical Performance


*click for larger image


  Also Recommended
LP388521.5A Adjustable Version
LP388533A Adjustable Version
LP38859Fixed 0.8V & 1.2V With Soft-start
Additional Resources
Design Tools

Application Notes


Block Diagram


*click for larger image

Block Diagram

Datasheet
RoHS Compliance Information Size in KbytesDate Click link below to Download
LP38856 3A Fast-Response High-Accuracy LDO Linear Regulator with Enable 360
Kbytes
10-Mar-07 Download
LP38856 3A Fast-Response High-Accuracy LDO Linear Regulator with Enable (Japanese)
409 Kbytes   Download

If you have trouble printing or viewing PDF file(s), see Printing Problems.


Package Availability, Models, Samples & Pricing
Part NumberPackageFactory Lead TimeModelsSamples &
Electronic
Orders
Budgetary PricingStd
Pack
Size
Package
Marking
Format
TypePinsSpec.MSL
Rating
Peak
Reflow
RoHS
Report
CAD
Symbols
WeeksQtyQty$US each
LP38856-1.2EVAL3A Fast-Response High-Accuracy LDO Linear Regulator with EnableFull productionN/A
 
Buy Now
1+$30.001-
8 weeksN/A
LP38856T-0.8TO-2205NOPB1NARoHS Download Full productionN/A
Samples
Buy Now
1K+$2.00rail
of
45
NSUZXYTTE#
LP38856T
0.8
6 weeks500
LP38856T-1.2TO-2205NOPB1NARoHS Download Full productionN/A
Samples
Buy Now
1K+$2.00rail
of
45
NSUZXYTTE#
LP38856T
1.2
6 weeks500
LP38856S-0.8TO-2635NOPB3245RoHS Download Full productionN/A
Samples
Buy Now
1K+$2.00rail
of
45
NSUZXYTTE#
LP38856S
0.8
8 weeksN/A
LP38856S-1.2TO-2635NOPB3245RoHS Download Full productionN/A
Samples
Buy Now
1K+$2.00rail
of
45
NSUZXYTTE#
LP38856S
1.2
6 weeks500
LP38856SX-0.8TO-2635NOPB3245RoHS Download Full productionN/A
 
Buy Now
1K+$2.00reel
of
500
NSUZXYTTE#
LP38856S
0.8
6 weeksN/A
LP38856SX-1.2TO-2635NOPB3245RoHS Download Full productionN/A
 
Buy Now
1K+$2.00reel
of
500
NSUZXYTTE#
LP38856S
1.2
6 weeks5000

General Description


The LP38856 is a high-current, fast-response regulator which can maintain output voltage regulation with an extremely low input to output voltage drop. Fabricated on a CMOS process, the device operates from two input voltages: VBIAS provides power for the internal bias and control circuits, as well as drive for the gate of the N-MOS power transistor, while VIN 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 LP38856 is available in TO-220 and TO-263 5-Lead packages.

Dropout Voltage: 240 mV (typical) at 3A load current.

Low Ground Pin Current: 14 mA (typical) at 3A load current.

Shutdown Current: 1 µA (typical) IIN(GND) when EN pin is low.

Precision Output Voltage: ±1.0% 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)
LP38856S-0.8CS065238968520440200011249079519
LP38856S-1.2CS065238968520440200011249079519
LP38856SX-0.8CS065238968520440200011249079519
LP38856SX-1.2CS065238968520440200011249079519
LP38856T-0.8CS065238968520440200011249079519
LP38856T-1.2CS065238968520440200011249079519

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


TitleSize in Kbytes Date Click link below to Download    
Article - How to Power Sub-Micron CMOS Loads with an Efficient LDO     View    

If you have trouble printing or viewing PDF file(s), see Printing Problems.

Application Notes


TitleSize in Kbytes Date Click link below to Download
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  

If you have trouble printing or viewing PDF file(s), see Printing Problems.

More Application Notes


TitleSize in Kbytes Date Click link below to Download
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  
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  
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  
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.

[Information as of 8-Nov-2009]