LP38691   
500mA Low Dropout CMOS Linear Regulators Stable with Ceramic Output Capacitors 		Click link to Download

Features
•2.0% output accuracy (25°C)
•Low dropout voltage: 250 mV @ 500mA (typ, 5V out)
•Wide input voltage range (2.7V to 10V)
•Precision (trimmed) bandgap reference
•Guaranteed specs for -40°C to +125°C
•1µA off-state quiescent current
•Thermal overload protection
•Foldback current limiting
•T0-252, SOT-223 and 6-Lead LLP packages
•Enable pin (LP38693)

Description

The LP38691/3 low dropout CMOS linear regulators provide tight output tolerance (2.0% typical), extremely low dropout voltage (250 mV @ 500mA load current, VOUT = 5V), and excellent AC performance utilizing ultra low ESR ceramic output capacitors.

The low thermal resistance of the LLP, SOT-223 and TO-252 packages allow the full operating current to be used even in high ambient temperature environments.

The use of a PMOS power transistor means that no DC base drive current is required to bias it allowing ground pin current to remain below 100 µA regardless of load current, input voltage, or operating temperature.

Dropout Voltage: 250 mV (typ) @ 500mA (typ. 5V out).

Ground Pin Current: 55 µA (typ) at full load.

Precision Output Voltage: 2.0% (25°C) accuracy.

Applications
•Hard Disk Drives
•Notebook Computers
•Battery Powered Devices
•Portable Instrumentation
Also Recommended
LP38501-ADJ▲New! National's LP38k Family Of High
LP38503-ADJ▲Performance LDOs Power Digital ICs
LP38691-ADJ▲Adjustable Output
LP38693▲Enable Pin
LP38853▲See More At LDO.NATIONAL.COM



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Also Recommended
LP38501-ADJ▲New! National's LP38k Family Of High
LP38503-ADJ▲Performance LDOs Power Digital ICs
LP38691-ADJ▲Adjustable Output
LP38693▲Enable Pin
LP38853▲See More At LDO.NATIONAL.COM
Paramaters / ValuesLP38691 LP38501-ADJ LP38503-ADJ LP38691-ADJ LP38693 LP38853
Output Current500 mA 3000 mA 3000 mA
Output Min1.8, 2.5, 3.3, 5 Volt 0.6 Volt 0.6 Volt
Input Min Voltage2.93, 2.7, 3.73, 5.43 Volt 2.7 Volt 2.7 Volt
Input Max Voltage10 Volt 5.5 Volt 5.5 Volt
Dropout VoltageUndefined, 0.25, 0.33, 0.43 Volt 0.42 Volt 0.42 Volt
Adjustable OutputNo Yes Yes
Quiescent Current0.055 mA 2 mA 2 mA
On/Off PinNo Yes No
Error FlagNo No No
RegTypeLDO LDO LDO
Temperature Min-40 deg C -40 deg C -40 deg C
Temperature Max125 deg C 125 deg C 125 deg C
Output Voltage1.8, 2.5, 3.3, 5 Volt
Output Max1.8, 2.5, 3.3, 5 Volt 5 Volt 5 Volt
PowerWiseYes

Datasheets
TitleSizeDateOther
Language
LP38691 LP38693 500mA Low Dropout CMOS Linear Regulators Stable with Ceramic Output Capacitors419
Kbytes		26-Aug-09 


More Application Notes
TitleSizeDateOther
Language
AN-1841: Application Note 1841 LMH1982 Evaluation Board User Guide913
Kbytes		21-May-08 中文

Part Number(s)
(NSID)		Top ViewAvailabilityCurrent Reported StockBudgetary PricingStandard Pack Size
LP38691DT-1.8/NOPB
LP38691DT-1.8

RoHS Status



TO-252		Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
ARROWWorldwide785
AVNET-EMWorldwide479
DIGIKEYWorldwide956
FARNELLEurope and Asia378
FUTUREWorldwide750
RS COMPONENTSWorldwide25
$0.53 each at 1K+ pcsrail
of
75
LP38691DT-2.5/NOPB
LP38691DT-2.5

RoHS Status



TO-252		Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
ARROWWorldwide600
DIGIKEYWorldwide93
FARNELLEurope and Asia325
FUTUREWorldwide1100
KEIKONGAsia Pacific225
RS COMPONENTSWorldwide15
$0.53 each at 1K+ pcsrail
of
75
LP38691DT-3.3/NOPB
LP38691DT-3.3

RoHS Status



TO-252		Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
AVNET-EMWorldwide50
DIGIKEYWorldwide0
FUTUREWorldwide1100
NEWARKAmericas747
RS COMPONENTSWorldwide180
$0.53 each at 1K+ pcsrail
of
75
LP38691DT-5.0/NOPB
LP38691DT-5.0

RoHS Status



TO-252		Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
ARROWWorldwide350
AVNET-EMWorldwide512
DIGIKEYWorldwide1683
FARNELLEurope and Asia1954
FUTUREWorldwide300
NEWARKAmericas361
RS COMPONENTSWorldwide205
TECHMOSAAsia Pacific1350
$0.53 each at 1K+ pcsrail
of
75
LP38691DTX-1.8/NOPB
LP38691DTX-1.8

RoHS Status



TO-252		Full production
Lead Time: 12 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$0.53 each at 1K+ pcsreel
of
2500
LP38691DTX-2.5/NOPB
LP38691DTX-2.5

RoHS Status



TO-252		Full production
Lead Time: 6 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
FUTUREWorldwide1100
$0.53 each at 1K+ pcsreel
of
2500
LP38691DTX-3.3/NOPB
LP38691DTX-3.3

RoHS Status



TO-252		Full production
Lead Time: 8 weeks

 
DistributorRegionQty
ARROWWorldwide2500
AVNET-EMWorldwide5000
DIGIKEYWorldwide0
KEIKONGAsia Pacific2500
$0.53 each at 1K+ pcsreel
of
2500
LP38691DTX-5.0/NOPB
LP38691DTX-5.0

RoHS Status



TO-252		Full production
Lead Time: 6 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
KEIKONGAsia Pacific2500
$0.53 each at 1K+ pcsreel
of
2500
LP38691SD-1.8/NOPB
LP38691SD-1.8

RoHS Status



LLP		Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
DIGIKEYWorldwide2351
KEIKONGAsia Pacific1000
$0.53 each at 1K+ pcsreel
of
1000
LP38691SD-2.5/NOPB

RoHS Status



LLP		Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
AVNET-EMWorldwide1000
DIGIKEYWorldwide1486
$0.53 each at 1K+ pcsreel
of
1000
LP38691SD-3.3/NOPB
LP38691SD-3.3

RoHS Status



LLP		Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
AVNET-EMWorldwide1000
DIGIKEYWorldwide1038
NEWARKAmericas78
$0.53 each at 1K+ pcsreel
of
1000
LP38691SD-5.0/NOPB
LP38691SD-5.0

RoHS Status



LLP		Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
ARROWWorldwide1000
DIGIKEYWorldwide1914
NEWARKAmericas662
$0.53 each at 1K+ pcsreel
of
1000
LP38691SDX-1.8/NOPB
LP38691SDX-1.8

RoHS Status



LLP		Full production
Lead Time: 8 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$0.53 each at 1K+ pcsreel
of
4500
LP38691SDX-2.5/NOPB
LP38691SDX-2.5

RoHS Status



LLP		Full production
Lead Time: 6 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$0.53 each at 1K+ pcsreel
of
4500
LP38691SDX-3.3/NOPB
LP38691SDX-3.3

RoHS Status



LLP		Full production
Lead Time: 6 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$0.53 each at 1K+ pcsreel
of
4500
LP38691SDX-5.0/NOPB
LP38691SDX-5.0

RoHS Status



LLP		Full production
Lead Time: 6 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$0.53 each at 1K+ pcsreel
of
4500

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

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/quality/green.

National's certificate of product compliance is located at RoHS Status.

Part Number(s)
(NSID)		Top ViewTypePinsMSL RatingPeak ReflowRoHS
Status		CAD SymbolsModelsPackage
Marking
Format
LP38691DT-1.8/NOPB
LP38691DT-1.8
TO-25232
1		260
235		DetailDownloadN/A
NSUZXYTT
LP38691
DT-1.8
LP38691DT-2.5/NOPB
LP38691DT-2.5
TO-25232
1		260
235		DetailDownloadN/A
NSUZXYTT
LP38691
DT-2.5
LP38691DT-3.3/NOPB
LP38691DT-3.3
TO-25232
1		260
235		DetailDownloadN/A
NSUZXYTT
LP38691
DT-3.3
LP38691DT-5.0/NOPB
LP38691DT-5.0
TO-25232
1		260
235		DetailDownloadN/A
NSUZXYTT
LP38691
DT-5.0
LP38691DTX-1.8/NOPB
LP38691DTX-1.8
TO-25232
1		260
235		DetailDownloadN/A
NSUZXYTT
LP38691
DT-1.8
LP38691DTX-2.5/NOPB
LP38691DTX-2.5
TO-25232
1		260
235		DetailDownloadN/A
NSUZXYTT
LP38691
DT-2.5
LP38691DTX-3.3/NOPB
LP38691DTX-3.3
TO-25232
1		260
235		DetailDownloadN/A
NSUZXYTT
LP38691
DT-3.3
LP38691DTX-5.0/NOPB
LP38691DTX-5.0
TO-25232
1		260
235		DetailDownloadN/A
NSUZXYTT
LP38691
DT-5.0
LP38691SD-1.8/NOPB
LP38691SD-1.8
LLP61
1		260
260		DetailDownloadN/A
ZXYTT
L118B
LP38691SD-2.5/NOPB
LLP61260DetailDownloadN/A
ZXYTT
L119B
LP38691SD-3.3/NOPB
LP38691SD-3.3
LLP61
1		260
260		DetailDownloadN/A
ZXYTT
L120B
LP38691SD-5.0/NOPB
LP38691SD-5.0
LLP61
1		260
260		DetailDownloadN/A
ZXYTT
L121B
LP38691SDX-1.8/NOPB
LP38691SDX-1.8
LLP61
1		260
260		DetailDownloadN/A
ZXYTT
L118B
LP38691SDX-2.5/NOPB
LP38691SDX-2.5
LLP61
1		260
260		DetailDownloadN/A
ZXYTT
L119B
LP38691SDX-3.3/NOPB
LP38691SDX-3.3
LLP61
1		260
260		DetailDownloadN/A
ZXYTT
L120B
LP38691SDX-5.0/NOPB
LP38691SDX-5.0
LLP61
1		260
260		DetailDownloadN/A
ZXYTT
L121B

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

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/quality/green.

National's certificate of product compliance is located at RoHS Status.

CAD Symbols and Models
Download LP38691 CAD Symbols
 Models
N/A

Reliability Metrics
Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
LP38691DT-1.8ABCD15003417500423400011201409060
LP38691DT-2.5ABCD15003417500423400011201409060
LP38691DT-3.3ABCD15003417500423400011201409060
LP38691DT-5.0ABCD15003417500423400011201409060
LP38691DTX-1.8ABCD15003417500423400011201409060
LP38691DTX-2.5ABCD15003417500423400011201409060
LP38691DTX-3.3ABCD15003417500423400011201409060
LP38691DTX-5.0ABCD15003417500423400011201409060
LP38691SD-1.8ABCD15003417500423400011201409060
LP38691SD-2.5ABCD15003417500423400011201409060
LP38691SD-3.3ABCD15003417500423400011201409060
LP38691SD-5.0ABCD15003417500423400011201409060
LP38691SDX-1.8ABCD15003417500423400011201409060
LP38691SDX-2.5ABCD15003417500423400011201409060
LP38691SDX-3.3ABCD15003417500423400011201409060
LP38691SDX-5.0ABCD15003417500423400011201409060

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/packaging/leadfree.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/quality/green.

National's certificate of product compliance is located at RoHS Status.

[Information as of 9-Feb-2010]