LP38691 - 500mA Low Dropout CMOS Linear Regulators

	LP38691 - 500mA Low Dropout CMOS Linear Regulators 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, V_OUT = 5V), and excellent AC performance utilizing ultra low ESR ceramic output capacitors.

The low thermal resistance of the LLP, SOT-223 and T0-252 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

Parametric Table expand

Parametric Table collapse

Output Current 500 mA

Output Min 1.8, 3.3, 5, 2.5 Volt

Dropout Voltage 0.25, 0.33, 0.43, Undefined Volt

Adjustable Output No

Quiescent Current 0.055 mA

Output Current 500 mA

Input Min Voltage 3.73, 5.43, 2.93, 2.7 Volt

Input Max Voltage 10 Volt

Output Min 1.8, 3.3, 5, 2.5 Volt

Dropout Voltage 0.25, 0.33, 0.43, Undefined 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, 3.3, 5, 2.5 Volt

Output Max 1.8, 3.3, 5, 2.5 Volt

PowerWise Yes

View Using Catalog

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 (see below)

Block Diagram

click for larger image

Datasheet

RoHS Compliance Information	Size in Kbytes	Date
LP38691/LP38693 500mA Low Dropout CMOS Linear Regulators Stable with Ceramic Output Capacitors	793 Kbytes	16-Sep-05	View Online	Download	Receive via Email

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Package Availability, Models, Samples & Pricing

Part Number

Package

Factory Lead Time

Models

Samples &
Electronic
Orders

Budgetary Pricing

Std
Pack
Size

Package
Marking
Format

Type

Pins

Spec.

MSL
Rating

Peak
Reflow

RoHS
Report

CAD
Symbols

Qty

Qty

$US each

LP38691SD-1.8

6

NOPB

1

260

Full production

N/A

Samples

1K+

$0.49

reel
of
1000

6 weeks

2000

LP38691SD-2.5

6

NOPB

1

260

Full production

N/A

Samples

1K+

$0.49

reel
of
1000

6 weeks

40000

LP38691SD-3.3

6

NOPB

1

260

Full production

N/A

Samples

1K+

$0.49

reel
of
1000

10 weeks

2500

LP38691SD-5.0

6

STD

NOPB

1

1

260

260

Full production

N/A

Samples

1K+

$0.49

reel
of
1000

12 weeks

2000

LP38691SDX-1.8

6

NOPB

1

260

Full production

N/A

1K+

$0.49

reel
of
4500

12 weeks

5000

LP38691SDX-2.5

6

NOPB

1

260

Full production

N/A

1K+

$0.49

reel
of
4500

12 weeks

N/A

LP38691SDX-3.3

6

NOPB

1

260

Full production

N/A

1K+

$0.49

reel
of
4500

12 weeks

N/A

LP38691SDX-5.0

6

NOPB

1

260

Full production

N/A

1K+

$0.49

reel
of
4500

12 weeks

5000

LP38691DT-1.8

3

NOPB

2

260

Full production

N/A

Samples

1K+

$0.49

rail
of
75

NSUZXYTT
LP38691
DT-1.8

6 weeks

500

LP38691DT-2.5

3

NOPB

2

260

Full production

N/A

Samples

1K+

$0.49

rail
of
75

NSUZXYTT
LP38691
DT-2.5

6 weeks

1000

LP38691DT-3.3

3

NOPB

2

260

Full production

N/A

Samples

1K+

$0.49

rail
of
75

NSUZXYTT
LP38691
DT-3.3

6 weeks

1000

LP38691DT-5.0

3

NOPB

2

260

Full production

N/A

Samples

1K+

$0.49

rail
of
75

NSUZXYTT
LP38691
DT-5.0

6 weeks

1000

LP38691DTX-1.8

3

NOPB

2

260

Full production

N/A

1K+

$0.49

reel
of
2500

NSUZXYTT
LP38691
DT-1.8

6 weeks

7500

LP38691DTX-2.5

3

NOPB

2

260

Full production

N/A

1K+

$0.49

reel
of
2500

NSUZXYTT
LP38691
DT-2.5

6 weeks

3000

LP38691DTX-3.3

3

STD

NOPB

1

2

235

260

Full production

N/A

1K+

$0.49

reel
of
2500

NSUZXYTT
LP38691
DT-3.3

6 weeks

10000

LP38691DTX-5.0

3

NOPB

2

260

Full production

N/A

1K+

$0.49

reel
of
2500

NSUZXYTT
LP38691
DT-5.0

6 weeks

3000

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, V_OUT = 5V), and excellent AC performance utilizing ultra low ESR ceramic output capacitors.

The low thermal resistance of the LLP, SOT-223 and T0-252 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	Early Failure Rate - Rejects	Sample Size (EFR)	PPM *	Rel. Rejects	Device Hours	Long Term Failure Rates (FITS)	MTTF
LP38691DT-1.8	ABCD150	0	28280	0	0	2974000	2	843880620
LP38691DT-2.5	ABCD150	0	28280	0	0	2974000	2	843880620
LP38691DT-3.3	ABCD150	0	28280	0	0	2974000	2	843880620
LP38691DT-5.0	ABCD150	0	28280	0	0	2974000	2	843880620
LP38691DTX-1.8	ABCD150	0	28280	0	0	2974000	2	843880620
LP38691DTX-2.5	ABCD150	0	28280	0	0	2974000	2	843880620
LP38691DTX-3.3	ABCD150	0	28280	0	0	2974000	2	843880620
LP38691DTX-5.0	ABCD150	0	28280	0	0	2974000	2	843880620
LP38691SD-1.8	ABCD150	0	28280	0	0	2974000	2	843880620
LP38691SD-2.5	ABCD150	0	28280	0	0	2974000	2	843880620
LP38691SD-3.3	ABCD150	0	28280	0	0	2974000	2	843880620
LP38691SD-5.0	ABCD150	0	28280	0	0	2974000	2	843880620
LP38691SDX-1.8	ABCD150	0	28280	0	0	2974000	2	843880620
LP38691SDX-2.5	ABCD150	0	28280	0	0	2974000	2	843880620
LP38691SDX-3.3	ABCD150	0	28280	0	0	2974000	2	843880620
LP38691SDX-5.0	ABCD150	0	28280	0	0	2974000	2	843880620

For more information on Reliability Metrics, please click here.

Application Notes

Title	Size in Kbytes	Date
AN-1841: Application Note 1841 LMH1982 Evaluation Board User Guide	913 Kbytes	21-May-08	View Online	Download	Receive via Email

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[Information as of 5-Sep-2008]