LP38691 - 500mA Low Dropout CMOS Linear Regulators Stable with Ceramic Output Capacitors from the PowerWise® Family
Datasheet Packaging Samples & Pricing Reliability Application Notes Knowledge Base

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)

General 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. More...


Applications

•Hard Disk Drives
•Notebook Computers
•Battery Powered Devices
•Portable Instrumentation
  Typical Application
click for larger image


ParametersValues
Output Current 500 mA
Output Min 1.8, 2.5, 3.3, 5 Volt
Input Min Voltage 2.93, 2.7, 3.73, 5.43 Volt
Input Max Voltage 10 Volt
Dropout Voltage Undefined, 0.25, 0.33, 0.43 Volt
Adjustable Output No
Quiescent Current 0.055 mA
On/Off Pin No
Error Flag No
RegType LDO
Temperature Min -40 deg C
Temperature Max 125 deg C
Output Voltage 1.8, 2.5, 3.3, 5 Volt
Output Max 1.8, 2.5, 3.3, 5 Volt
PowerWise Yes


Typical Performance

click for larger image


  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
Additional Resources
Application Notes


Block Diagram

click for larger image

LP38691 Block Diagram for LLP

Datasheet
RoHS Compliance Information Size in KbytesDate Click link below to Download
LP38691 LP38693 500mA Low Dropout CMOS Linear Regulators Stable with Ceramic Output Capacitors 419
Kbytes		 26-Aug-09 Download

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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
LP38691SD-1.8LLP6NOPB1260RoHS Download Full productionN/A
Samples
Buy Now 		1K+$0.53reel
of
1000		ZXYTT
L118B
6 weeks5000
LP38691SD-2.5LLP6NOPB1260RoHS Download Full productionN/A
Samples
Buy Now 		1K+$0.53reel
of
1000		ZXYTT
L119B
6 weeks10000
LP38691SD-3.3LLP6NOPB1260RoHS Download Full productionN/A
Samples
Buy Now 		1K+$0.53reel
of
1000		ZXYTT
L120B
6 weeks2000
LP38691SD-5.0LLP6NOPB
STD		1
1		260
260		RoHS Download Full productionN/A
Samples
Buy Now 		1K+$0.53reel
of
1000		ZXYTT
L121B
6 weeks5000
LP38691SDX-1.8LLP6NOPB1260RoHS Download Full productionN/A
 
Buy Now 		1K+$0.53reel
of
4500		ZXYTT
L118B
6 weeksN/A
LP38691SDX-2.5LLP6NOPB1260RoHS Download Full productionN/A
 
Buy Now 		1K+$0.53reel
of
4500		ZXYTT
L119B
6 weeksN/A
LP38691SDX-3.3LLP6NOPB1260RoHS Download Full productionN/A
 
Buy Now 		1K+$0.53reel
of
4500		ZXYTT
L120B
6 weeksN/A
LP38691SDX-5.0LLP6NOPB1260RoHS Download Full productionN/A
 
Buy Now 		1K+$0.53reel
of
4500		ZXYTT
L121B
6 weeks5000
LP38691DT-1.8TO-2523NOPB2260RoHS Download Full productionN/A
Samples
Buy Now 		1K+$0.53rail
of
75		NSUZXYTT
LP38691
DT-1.8
6 weeks2000
LP38691DT-2.5TO-2523NOPB2260RoHS Download Full productionN/A
Samples
Buy Now 		1K+$0.53rail
of
75		NSUZXYTT
LP38691
DT-2.5
6 weeks500
LP38691DT-3.3TO-2523NOPB
STD		2
1		260
235		RoHS Download Full productionN/A
Samples
Buy Now 		1K+$0.53rail
of
75		NSUZXYTT
LP38691
DT-3.3
6 weeks1000
LP38691DT-5.0TO-2523NOPB2260RoHS Download Full productionN/A
Samples
Buy Now 		1K+$0.53rail
of
75		NSUZXYTT
LP38691
DT-5.0
6 weeks1000
LP38691DTX-1.8TO-2523NOPB2260RoHS Download Full productionN/A
 
Buy Now 		1K+$0.53reel
of
2500		NSUZXYTT
LP38691
DT-1.8
6 weeks5000
LP38691DTX-2.5TO-2523NOPB2260RoHS Download Full productionN/A
 
Buy Now 		1K+$0.53reel
of
2500		NSUZXYTT
LP38691
DT-2.5
6 weeks3000
LP38691DTX-3.3TO-2523NOPB
STD		2
1		260
235		RoHS Download Full productionN/A
 
Buy Now 		1K+$0.53reel
of
2500		NSUZXYTT
LP38691
DT-3.3
6 weeks5000
LP38691DTX-5.0TO-2523NOPB2260RoHS Download Full productionN/A
 
Buy Now 		1K+$0.53reel
of
2500		NSUZXYTT
LP38691
DT-5.0
6 weeks3000

General 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.

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.


More Application Notes

TitleSize in Kbytes Date Click link below to Download
AN-1841: Application Note 1841 LMH1982 Evaluation Board User Guide 913
Kbytes		 21-May-08 Download
AN-1841 (Chinese): Application Note 1841 LMH1982 Evaluation Board User Guide
 599 Kbytes  

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[Information as of 7-Nov-2009]