LM1084 - 5A Low Dropout Positive Regulators

LM1084 - 5A Low Dropout Positive Regulators

Datasheet	Packaging	Samples & Pricing	Reliability	Design Tools	Application Notes	Knowledge Base

Features

Available in 3.3V, 5.0V, 12V and Adjustable Versions
Current Limiting and Thermal Protection

Output Current	5A
Industrial Temperature Range	-40°C to 125°C
Line Regulation	0.015% (typical)
Load Regulation	0.1% (typical)

General Description

The LM1084 is a series of low dropout voltage positive regulators with a maximum dropout of 1.5V at 5A of load current. More...

Applications

•	Post Regulator for Switching DC/DC Conveter
•	High Efficiency Linear Regulators
•	Battery Charger

Typical Application

click for larger image

Parametric Table expand

Parametric Table collapse

Output Current 5000 mA

Output Min 1.25, 3.3, 5 Volt

Input Min Voltage 2.6 Volt

Input Max Voltage 25, 27, 29 Volt

Dropout Voltage 1.3 Volt

Adjustable Output No

Quiescent Current 5 mA

Output Current 5000 mA

Output Min 1.25, 3.3, 5 Volt

Input Min Voltage 2.6 Volt

Input Max Voltage 25, 27, 29 Volt

Dropout Voltage 1.3 Volt

Adjustable Output No

Quiescent Current 5 mA

On/Off Pin No

Error Flag No

RegType LDO

Temperature Min -40 deg C

Temperature Max 125 deg C

Output Max 3.3, 27.5, 5 Volt

Output Voltage 3.3, 5 Volt

View Using Catalog

Typical Performance

click for larger image

Also Recommended

LM2677	Switching Solution With Higher Efficiency , Wider Voltage Range , Shutdown Mode
LM2678	Switching Solution With Higher Efficiency , Wider Voltage Range , Shutdown Mode
LM2679	Switching Solution With Higher Efficiency , Wider Voltage Range , Adjustable Current Limit
LM1085	3A Version
LM1086	1.5A Version

Additional Resources

Design Tools (see below)

Application Notes (see below)

Connection Diagram

click for larger image

Datasheet

RoHS Compliance Information	Size in Kbytes	Date
LM1084 5A Low Dropout Positive Regulators	750 Kbytes	6-Jun-05	Download
LM1084 5A Low Dropout Positive Regulators (Japanese)	499 Kbytes

If you have trouble printing or viewing PDF file(s), see Printing Problems.

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

LM1084IT-12

3

STD

NOPB

1

1

NA

NA

N/A

Buy Now

1K+

$1.47

rail
of
45

NSUZXYTTE#
LM1084
IT-12

12 weeks

5000

LM1084IT-3.3

3

STD

NOPB

1

1

NA

NA

Full production

N/A

Samples

Buy Now

1K+

$1.47

rail
of
45

NSUZXYTTE#
LM1084
IT-3.3

8 weeks

500

LM1084IT-5.0

3

STD

NOPB

1

1

NA

NA

Full production

N/A

Buy Now

1K+

$1.47

rail
of
45

NSUZXYTTE#
LM1084
IT-5.0

8 weeks

500

LM1084IT-ADJ

3

STD

NOPB

1

1

NA

NA

Full production

N/A

Samples

Buy Now

1K+

$1.47

rail
of
45

NSUZXYTTE#
LM1084
IT-ADJ

8 weeks

500

LM1084IS-12

3

NOPB

3

245

Lifetime buy

N/A

Buy Now

1K+

$1.48

rail
of
45

NSUZXYTTE#
LM1084
IS-12

8 weeks

1000

LM1084IS-3.3

3

STD

NOPB

3

3

235

245

Full production

N/A

Samples

Buy Now

1K+

$1.48

rail
of
45

NSUZXYTTE#
LM1084
IS-3.3

8 weeks

500

LM1084IS-5.0

3

STD

NOPB

3

3

235

245

Full production

N/A

Buy Now

1K+

$1.48

rail
of
45

NSUZXYTTE#
LM1084
IS-5.0

8 weeks

500

LM1084IS-ADJ

3

STD

NOPB

3

3

235

245

Full production

N/A

Samples

Buy Now

1K+

$1.48

rail
of
45

NSUZXYTTE#
LM1084
IS-ADJ

8 weeks

1000

LM1084ISX-12

3

NOPB

3

245

Lifetime buy

N/A

Buy Now

1K+

$1.48

reel
of
500

NSUZXYTTE#
LM1084
IS-12

8 weeks

1000

LM1084ISX-3.3

3

STD

NOPB

3

3

235

245

Full production

N/A

Buy Now

1K+

$1.48

reel
of
500

NSUZXYTTE#
LM1084
IS-3.3

8 weeks

1000

LM1084ISX-5.0

3

STD

NOPB

3

3

235

245

Full production

N/A

Buy Now

1K+

$1.48

reel
of
500

NSUZXYTTE#
LM1084
IS-5.0

8 weeks

1000

LM1084ISX-ADJ

3

STD

NOPB

3

3

235

245

Full production

N/A

Buy Now

1K+

$1.48

reel
of
500

NSUZXYTTE#
LM1084
IS-ADJ

8 weeks

1000

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LM1084IS-12	LM1084IS-ADJ	NATIONAL SEMICONDUCTOR	01 Dec 2009
LM1084ISX-12	LM1084IS-ADJ	NATIONAL SEMICONDUCTOR	01 Dec 2009
LM1084IT-12	NONE	NATIONAL SEMICONDUCTOR	16 Nov 2008

General Description

The LM1084 is a series of low dropout voltage positive regulators with a maximum dropout of 1.5V at 5A of load current. It has the same pin-out as National Semiconductor's industry standard LM317.

The LM1084 is available in an adjustable version, which can set the output voltage with only two external resistors. It is also available in three fixed voltages: 3.3V, 5.0V and 12.0V. The fixed versions intergrate the adjust resistors.

The LM1084 circuit includes a zener trimmed bandgap reference, current limiting and thermal shutdown.

The LM1084 series is available in TO-220 and TO-263 packages. Refer to the LM1085 for the 3A version, and the LM1086 for the 1.5A version.

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM1084IS-12	LB300	0	32249	0	0	3406500	2	966603676
LM1084IS-3.3	LB300	0	32249	0	0	3406500	2	966603676
LM1084IS-5.0	LB300	0	32249	0	0	3406500	2	966603676
LM1084IS-ADJ	LB300	0	32249	0	0	3406500	2	966603676
LM1084ISX-12	LB300	0	32249	0	0	3406500	2	966603676
LM1084ISX-3.3	LB300	0	32249	0	0	3406500	2	966603676
LM1084ISX-5.0	LB300	0	32249	0	0	3406500	2	966603676
LM1084ISX-ADJ	LB300	0	32249	0	0	3406500	2	966603676
LM1084IT-12	LB300	0	32249	0	0	3406500	2	966603676
LM1084IT-3.3	LB300	0	32249	0	0	3406500	2	966603676
LM1084IT-5.0	LB300	0	32249	0	0	3406500	2	966603676
LM1084IT-ADJ	LB300	0	32249	0	0	3406500	2	966603676

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.

Design Tools

Title	Size in Kbytes	Date
LM108X Qualification Package	1455 Kbytes	24-Jun-1999	View Online	Download

If you have trouble printing or viewing PDF file(s), see Printing Problems.

More Application Notes

Title	Size in Kbytes	Date
AN-79: Application Note 79 IC Preamplifier Challenges Choppers on Drift	380 Kbytes	1-Oct-02	Download
AN-29: Application Note 29 IC Op Amp Beats FETs on Input Current	444 Kbytes	1-Oct-02	Download
AN-241: Application Note 241 Working with High Impedance Op Amps	130 Kbytes	4-Oct-04	Download
AN-173: Application Note 173 IC Zener Eases Reference Design	54 Kbytes	1-Oct-02	Download
AN-161: Application Note 161 IC Voltage Reference has 1 ppm per Degree Drift	138 Kbytes	10-Oct-02	Download
AN-222: Application Note 222 Super Matched Bipolar Transistor Pair Sets New Standards for Drift and Noise	399 Kbytes	1-Oct-02	Download
AN-178: Application Note 178 Applications for an Adjustable IC Power Regulator	40 Kbytes	3-Oct-02	Download
AN-1148: Application Note 1148 Linear Regulators: Theory Of Operation and Compensation	200 Kbytes	10-May-04	Download
AN-1148 (Japanese): Application Note 1148 Linear Regulators: Theory Of Operation and Compensation	216 Kbytes
AN-1148 (Chinese): Application Note 1148 Linear Regulators: Theory Of Operation and Compensation	396 Kbytes
AN-30: Application Note 30 Log Converters	124 Kbytes	2-Oct-02	Download
AN-41: Application Note 41 Precision IC Comparator Runs from +5V Logic Supply	150 Kbytes	2-Oct-02	Download
AN-56: 1.2 Volt Reference	116 Kbytes	4-Nov-95	Download
AN-56 (Chinese): 1.2 Volt Reference	291 Kbytes

If you have trouble printing or viewing PDF file(s), see Printing Problems.

[Information as of 3-Jul-2009]