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



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Typical Application
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Block Diagram
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Typical Performance
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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
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 0.6 Volt

Datasheet
TitleSizeDateOther
Language
LP38500/2-ADJ, LP38500A/2A-ADJ 1.5A FlexCap Low Dropout Linear Regulator for 2.7V to 5.5V Inputs371
Kbytes		30-Oct-09日本語


Featured Application Notes
TitleSizeDateOther
Language
AN-1758: Application Note 1758 LP38502SD-ADJ Evaluation Board146
Kbytes		28-Nov-07 
AN-1782: Application Note 1782 LP38502TJ-ADJ Evaluation Board146
Kbytes		29-Jan-08 
AN-1759: Application Note 1759 LP38502TS-ADJ Evaluation Board147
Kbytes		28-Nov-07 
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 


More Application Notes
TitleSizeDateOther
Language
AN-1241: Application Note 1241 LP2995 Evaluation Board373
Kbytes		25-Sep-02 
AN-1268: Application Note 1268 LP2996 Evaluation Board67
Kbytes		5-Dec-02 
AN-1254: Application Note 1254 DDR-SDRAM Termination Simplified Using a Linear Regulator49
Kbytes		1-Oct-02 

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

RoHS

Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
DIGIKEYWorldwide1595
$0.70 each at 1K+ pcsreel
of
1000
LP38502SD-ADJ/NOPB

RoHS

Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
ARROWWorldwide5000
AVNET-EMWorldwide1000
DIGIKEYWorldwide1603
FUTUREWorldwide1100
NEWARKAmericas3641
$0.70 each at 1K+ pcsreel
of
1000
LP38502ASDX-ADJ/NOPB

RoHS

Full production
Lead Time: 6 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$0.70 each at 1K+ pcsreel
of
4500
LP38502SDX-ADJ/NOPB

RoHS

Full production
Lead Time: 6 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$0.70 each at 1K+ pcsreel
of
4500
LP38502ATJ-ADJ/NOPB

RoHS

Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
DIGIKEYWorldwide1937
$0.70 each at 1K+ pcsreel
of
1000
LP38502TJ-ADJ/NOPB

RoHS

Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
ARROWWorldwide5000
DIGIKEYWorldwide984
$0.70 each at 1K+ pcsreel
of
1000
LP38502TS-ADJ/NOPB

RoHS



TO-263		Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
ARROWWorldwide35
DIGIKEYWorldwide0
$0.70 each at 1K+ pcsrail
of
45
LP38502TSX-ADJ/NOPB

RoHS



TO-263		Full production
Lead Time: 6 weeks

 
DistributorRegionQty
DIGIKEYWorldwide1771
FUTUREWorldwide1100
NEWARKAmericas122
RS COMPONENTSWorldwide355
$0.70 each at 1K+ pcsreel
of
500

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


 
DistributorRegionQty
DIGIKEYWorldwide0
NATIONALWorldwide117
$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 PricingStandard Pack Size
LP38502TJ-ADJEV
Evaluation Board for the LP38502Full production


 
DistributorRegionQty
DIGIKEYWorldwide0
NATIONALWorldwide50
$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 PricingStandard Pack Size
LP38502TS-ADJEV
1.5A FlexCap Low Dropout Linear Regulator for 2.7V to 5.5V Inputs Evaluation Board (TO-263)Full production


 
DistributorRegionQty
DIGIKEYWorldwide0
NATIONALWorldwide18
$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:


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


 
DistributorRegionQty
DIGIKEYWorldwide0
NATIONALWorldwide96
$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 PricingStandard Pack Size
LP38502ATJ-EV
Evaluation Board for the LP38502Full production


 
DistributorRegionQty
DIGIKEYWorldwide0
NATIONALWorldwide97
$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)		Top ViewTypePinsMSL RatingPeak ReflowRoHSCAD SymbolsModelsPackage
Marking
Format
LP38502ASD-ADJ/NOPB
LLP81260RoHSN/AN/A
XYTT
LKVA
LP38502SD-ADJ/NOPB
LLP81260RoHSN/AN/A
XYTT
LKVB
LP38502ASDX-ADJ/NOPB
LLP81260RoHSN/AN/A
XYTT
LKVA
LP38502SDX-ADJ/NOPB
LLP81260RoHSN/AN/A
XYTT
LKVB
LP38502ATJ-ADJ/NOPB
TO-263 THIN51260RoHSN/AN/A
NSUZXYTTE#
LP38502A
TJ-ADJ
LP38502TJ-ADJ/NOPB
TO-263 THIN51260RoHSN/AN/A
NSUZXYTTE#
LP38502
TJ-ADJ
LP38502TS-ADJ/NOPB
TO-26353245RoHSN/AN/A
NSUZXYTTE#
LP38502
TS-ADJ
LP38502TSX-ADJ/NOPB
TO-26353245RoHSN/AN/A
NSUZXYTTE#
LP38502
TS-ADJ

Reliability Metrics
Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
LP38502ASD-ADJCMOS70184060010890004309006723
LP38502ASDX-ADJCMOS70184060010890004309006723
LP38502ATJ-ADJCMOS70184060010890004309006723
LP38502SD-ADJCMOS70184060010890004309006723
LP38502SDX-ADJCMOS70184060010890004309006723
LP38502TJ-ADJCMOS70184060010890004309006723
LP38502TS-ADJCMOS70184060010890004309006723
LP38502TSX-ADJCMOS70184060010890004309006723

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.


[Information as of 21-Nov-2009]