National Semiconductor | High-performance Analog

 

 LP38502-ADJ   
1.5A FlexCap Low Dropout Linear Regulator for 2.7V to 5.5V Inputs 		Click link to Download

Features

  • FlexCap: Stable with ceramic, tantalum, or aluminum capacitors
  • Stable with 10 µF input/output capacitor
  • Adjustable output voltage from 0.6V to 5V
  • Low ground pin current
  • 25 nA quiescent current in shutdown mode
  • Guaranteed output current of 1.5A
  • Available in TO-263, TO-263 THIN, and LLP-8 packages
  • Guaranteed VADJ accuracy of ±1.5% @ 25°C (A Grade)
  • Guaranteed accuracy of ±3.5% @ 25°C (STD)
  • Over-Temperature and Over-Current protection
  • −40°C to +125°C operating TJ range
  • Enable pin (LP38502)

    • Description

    National's FlexCap LDO's feature unique compensation that allows the use of any type of output capacitor with no limits on minimum or maximum ESR. The LP38500/2 series of low-dropout linear regulators operates from a +2.7V to +5.5V input supply. These ultra low dropout linear regulators respond very quickly to step changes in load, which makes them suitable for low voltage microprocessor applications. Developed on a CMOS process, (utilizing a PMOS pass transistor), the LP38500/2 has low quiescent current that changes little with load current.

    Ground Pin Current: Typically 2 mA at 1.5A load current.

    Disable Mode: Typically 25 nA quiescent current when the Enable pin is pulled low.

    Simplified Compensation: Stable with any type of output capacitor, regardless of ESR.

    Precision Output: "A" grade versions available with 1.5% VADJ tolerance (25°C) and 3% over line, load and temperature.


    Applications

  • ASIC Power Supplies In:

  •  Printers, Graphics Cards, DVD Players

  •  Set Top Boxes, Copiers, Routers
  • DSP and FPGA Power Supplies
  • SMPS Regulator
  • Conversion from 3.3V or 5V Rail

    • WEBENCH® LP38502
        Min   Max   Range  
      Vin V    2.70 – 5.50V  
      Vout V    0.60 – 5.00V  
      Iout A    ≤ 1.50A  
      Ambient Temp °C    ≤ 100°C  
    Footprint BOM Cost Efficiency
     
     
     
     
    What are WEBENCH® tools?




    Typical Application
    *click for larger image


    		Block Diagram
    *click for larger image



    Typical Performance
    *click for larger image


     

    ParametersValues
    Output Current 1500 mA
    Output Min 0.6 Volt
    Input Min Voltage 2.7 Volt
    Input Max Voltage 5.5 Volt
    Dropout Voltage 0.220 Volt
    Adjustable Output Yes
    Quiescent Current 2 mA
    PSRR 58 dB
    Voltage Noise (rms) 100 uV
    Ceramic Capacitors Stable Yes
    Feedback Tolerance 3.5 %
    On/Off Pin Yes
    PowerGood / Error Flag No
    RegType LDO
    Temperature Min -40 deg C
    Temperature Max 125 deg C
    Special Features Flexcap LDO
    Output Max 5.1 Volt
    Feedback Voltage 0.600 Volt

    Datasheets
    TitleSizeDateOther
    Language
    LP38502-ADJ 1.5A FlexCap Low Dropout Linear Regulator for 2.7V to 5.5V Inputs371
    Kbytes    		30-Oct-09日本語  


    Application Notes
    TitleSizeDateOther
    Language
    AN-1829: Application Note 1829 LP38502ASD-ADJ Evaluation Board146
    Kbytes    		12-May-08 
    AN-1831: Application Note 1831 LP38502ATJ-ADJ Evaluation Board146
    Kbytes    		4-Apr-08 
    AN-1782: Application Note 1782 LP38502TJ-ADJ Evaluation Board146
    Kbytes    		29-Jan-08 
    AN-1758: Application Note 1758 LP38502SD-ADJ Evaluation Board146
    Kbytes    		28-Nov-07 
    AN-1759: Application Note 1759 LP38502TS-ADJ Evaluation Board147
    Kbytes    		28-Nov-07 

    Part Number(s)
    (NSID)    		Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LP38502ASD-ADJ/NOPB


    RoHS Status

    LLP    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide850
    AVNET-EMWorldwide3000
    CEACAsia Pacific189000
    DIGI-KEYWorldwide1273
    MOUSERWorldwide733
    TAYLORAmericas850
    		$0.70 each at 1K+ pcsreel
    of
    1000
    LP38502ASDX-ADJ/NOPB


    RoHS Status

    LLP    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$0.70 each at 1K+ pcsreel
    of
    4500
    LP38502ATJ-ADJ/NOPB


    RoHS Status

    TO-263 THIN    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    AVNET-EMWorldwide328
    DIGI-KEYWorldwide1533
    MOUSERWorldwide1000
    		$0.70 each at 1K+ pcsreel
    of
    1000
    LP38502SD-ADJ/NOPB


    RoHS Status

    LLP    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide3794
    AVNET-EMWorldwide798
    DIGI-KEYWorldwide4178
    FARNELLEurope and Asia1443
    MOUSERWorldwide1000
    NEWARKAmericas2454
    TAYLORAmericas3794
    		$0.70 each at 1K+ pcsreel
    of
    1000
    LP38502SDX-ADJ/NOPB


    RoHS Status

    LLP    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$0.70 each at 1K+ pcsreel
    of
    4500
    LP38502TJ-ADJ/NOPB


    RoHS Status

    TO-263 THIN    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide4000
    AVNET-EMWorldwide1869
    CEACAsia Pacific6000
    DIGI-KEYWorldwide5500
    TAYLORAmericas4000
    		$0.70 each at 1K+ pcsreel
    of
    1000
    LP38502TS-ADJ/NOPB


    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide456
    AVNET-EMWorldwide332
    DIGI-KEYWorldwide0
    MOUSERWorldwide495
    TAYLORAmericas456
    		$0.70 each at 1K+ pcsrail
    of
    45
    LP38502TSX-ADJ/NOPB


    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    ARROWWorldwide500
    AVNET-EMWorldwide1500
    DIGI-KEYWorldwide8164
    FARNELLEurope and Asia732
    MOUSERWorldwide907
    NEWARKAmericas508
    RS COMPONENTSWorldwide355
    TAYLORAmericas500
    		$0.70 each at 1K+ pcsreel
    of
    500

    All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

    Moisture Sensitivity Level Data for LP38502-ADJ.

    A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

    National's certificate of product compliance for LP38502-ADJ is located at RoHS Status.

    Part Number(s)
    (NSID)    		DescriptionAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LP38502ASD-EV
    		1.5A FlexCap Low Dropout Linear Regulator for 2.7V to 5.5V Inputs Evaluation Board (LLP8)Full production


     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    MOUSERWorldwide1
    		$40.00 each1

    Description:

    This evaluation board highlights the LP38502ASD-Adj, a 1.5A Low-Dropout (LDO) linear regulator in the LLP-8 package which has an adjustable out-put voltage (set by external resistors).

    Changing the Output Voltage

    The resistors R1 and R2 set the output voltage. The equation to determine output voltage is:

              VOUT=VADJ x (1 + R1/R2)

              Where VADJ is typically 0.6V.

              The board has installed values of:
              R1 = 19.1KΩ
              R2 = 6.04kΩ

    Which sets the output to 2.5V. R1 can be adjusted to change the normal output voltage to other values. The minimum output voltage which can be set is the ADJ pin voltage, which is approximately 0.6V. This is obtained by installing a jumper or low value resistor (less than 10Ω) at R1. The maximum usable output voltage is limited by the maximum input voltage which is 5.5V. Since rated dropout voltage at full current is 0.375V, this means the maximum usable output voltage for full current operation is about 5.1V.

    Contents:


    Part Number(s)
    (NSID)    		DescriptionAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LP38502ATJ-EV
    		Evaluation Board for the LP38502Full production


     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    MOUSERWorldwide1
    		$40.00 each1

    Description:

    The LP38502ATJ-ADJ is a 1.5A Low-Dropout (LDO) linear regulator in the TO-263 THIN package which has an adjustable output voltage (set by external resistors)

    Contents:


    Part Number(s)
    (NSID)    		DescriptionAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LP38502SD-ADJEV
    		1.5A FlexCap Low Dropout Linear Regulator for 2.7V to 5.5V Inputs Evaluation Board (LLP8)Full production


     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    MOUSERWorldwide5
    		$40.00 each1

    Description:

    This Evaluation Board highlights the LP38502SD-ADJ, a 1.5A Low-Dropout (LDO) linear regulator in the LLP-8 package which has an adjustable output voltage (set by external resistors).

    Changing the Output Voltage

    The resistors R1 and R2 set the output voltage. The equation to determine output voltage is:

          VOUT = VADJ x (1 + R1/R2)

    where VADJ is typically 0.6V.

    The board has installed values of:

    R1 = 19.1k

    R2 = 6.04k

    Which sets the output to 2.5V. R1 can be adjusted to change the nominal output voltage to other values. The minimum output voltage which can be set is the ADJ pin voltage, which is approximately 0.6V. This is obtained by installing a jumper or low value resistor (less than 10 at R1. The maximum usable output voltage is limited by the maximum input voltage which is 5.5V. Since rated dropout voltage at full current is 0.375V, this means the maximum? usable output voltage for full current operation is about 5.1V.

    Contents:


    Part Number(s)
    (NSID)    		DescriptionAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LP38502TJ-ADJEV
    		Evaluation Board for the LP38502Full production


     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$40.00 each1

    Description:

    The LP38502TJ-ADJ is a 1.5A Low-Dropout (LDO) linear regulator in the thin TO-263 package which has an adjustable output voltage (set by external resistors).

    Contents:

    • LP38502 Evaluation Board
    • LP38502 Datasheet
    • Application Note 1782 for the LP38502TJ-ADJ Evaluation Board

    Part Number(s)
    (NSID)    		DescriptionAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LP38502TS-ADJEV
    		1.5A FlexCap Low Dropout Linear Regulator for 2.7V to 5.5V Inputs Evaluation Board (TO-263)Full production


     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$40.00 each1

    Description:

    This Evaluation Board highlights the LP38502TS-ADJ, a 1.5A Low-Dropout (LDO) linear regulator in the TO-263 package which has an adjustable output voltage (set by external resistors).

    Changing the Output Voltage

    The resistors R1 and R2 set the output voltage. The equation to determine output voltage is:


          VOUT = VADJ x (1 + R1/R2)

    where VADJ is typically 0.6V.

    The board has installed values of:
    R1 = 19.1k
    R2 = 6.04k

    Which sets the output to 2.5V. R1 can be adjusted to change the nominal output voltage to other values. The minimum output voltage which can be set is the ADJ pin voltage, which is approximately 0.6V. This is obtained by installing a jumper or low value resistor (less than 10 at R1. The maximum usable output voltage is limited by the maximum input voltage which is 5.5V. Since rated dropout voltage at full current is 0.375V, this means the maximum? usable output voltage for full current operation is about 5.1V.

    Contents:




    National Semiconductor follows the provisions of the Product Stewardship Guide for Customers (CSP-9-111C1) and Banned Substances and Materials of Interest Specification (CSP-9-111S2) for regulatory environmental compliance. Details may be found at: www.national.com/en/packaging/greennopb.html. Lead free products are RoHS compliant.

    Lead Free product status is available through the search tool located here

    Part Number(s)
    (NSID)    		Weight
    (milligrams)    		TypePinsMSL RatingPeak ReflowRoHS
    Status    		CAD SymbolsModelsPackage
    Marking
    Format
    LP38502ASD-ADJ/NOPB

    		17.85
    		LLP81260DetailN/AN/A
    		XYTT
    LKVA
    LP38502ASDX-ADJ/NOPB

    		17.85
    17.903
    		LLP81260DetailN/AN/A
    		XYTT
    LKVA
    LP38502ATJ-ADJ/NOPB

    		789.308
    		TO-263 THIN51260DetailN/AN/A
    		NSUZXYTTE#
    LP38502A
    TJ-ADJ
    LP38502SD-ADJ/NOPB

    		17.85
    17.903
    		LLP81260DetailN/AN/A
    		XYTT
    LKVB
    LP38502SDX-ADJ/NOPB

    		17.85
    17.903
    		LLP81260DetailN/AN/A
    		XYTT
    LKVB
    LP38502TJ-ADJ/NOPB

    		789.308
    789.308
    		TO-263 THIN51260DetailN/AN/A
    		NSUZXYTTE#
    LP38502
    TJ-ADJ
    LP38502TS-ADJ/NOPB

    		1448.647
    N/A
    		TO-26353245DetailN/AN/A
    		NSUZXYTTE#
    LP38502
    TS-ADJ
    LP38502TSX-ADJ/NOPB

    		1448.647
    N/A
    		TO-26353245DetailN/AN/A
    		NSUZXYTTE#
    LP38502
    TS-ADJ

    All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

    Moisture Sensitivity Level Data for LP38502-ADJ.

    A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

    National's certificate of product compliance for LP38502-ADJ is located at RoHS Status.

    CAD Symbols and Models
    N/A
    		 Models
    N/A


    Reliability Metrics
    Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
    LP38502ASD-ADJCMOS70213010015840003449464325
    LP38502ASDX-ADJCMOS70213010015840003449464325
    LP38502ATJ-ADJCMOS70213010015840003449464325
    LP38502SD-ADJCMOS70213010015840003449464325
    LP38502SDX-ADJCMOS70213010015840003449464325
    LP38502TJ-ADJCMOS70213010015840003449464325
    LP38502TS-ADJCMOS70213010015840003449464325
    LP38502TSX-ADJCMOS70213010015840003449464325

    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.


    All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

    Moisture Sensitivity Level Data for LP38502-ADJ.

    A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

    National's certificate of product compliance for LP38502-ADJ is located at RoHS Status.

    [Information as of 9-Feb-2012]
    Copyright © 2011 National Semiconductor Corporation