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Products > Analog - Regulators > Linear Regulators - Low Dropout Voltage > Positive Voltage - Adjustable > LM1085

LM1085 Product Folder

3A Low Dropout Positive Regulators

Generic P/N 1085

General
Description

Package
& Models

Samples
& Pricing

Reliability
Metrics

Application
Notes

Parametric Table

Parametric Table

Temperature Min (deg C)	-40
Temperature Max (deg C)	125
Multiple Output Capability	No
On/Off Pin	No
Error Flag	No
InputMin Voltage (Volt)	2.60
InputMax Voltage (Volt)	29
Output Current (mA)	3000

Dropout Voltage (Volt)	1.30
Quiescent Current (mA)	5
SecondaryOutput Voltage (Volt)	-
SecondaryOutput Current (Amp)	-
RegType	LDO
Output Min (Volt)	1.25
Output Max (Volt)	27.50
Watchdog	No

Datasheet

Title	Size in Kbytes	Date	View Online	Download	Receive via Email
LM1085 3A Low Dropout Positive Regulators	358 Kbytes	14-Jul-03	View Online	Download	Receive via Email
LM1085 3A Low Dropout Positive Regulators (JAPANESE)	198 Kbytes

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Package Availability, Models, Samples & Pricing

Part Number

Package

Status

Models

Samples &
Electronic
Orders

Budgetary Pricing

Std
Pack
Size

Package
Marking

Type

Pins

MSL/Lead-Free Availability

Lead
Time

Qty

SPICE

IBIS

Qty

$US each

LM1085IT-12

3

Full production

N/A

N/A

1K+

$0.61

rail
of
45

NSUZXYTT
LM1085
IT-12

7-9 weeks

75000

LM1085IT-3.3

3

Full production

N/A

N/A

1K+

$0.61

rail
of
45

NSUZXYTT
LM1085
IT-3.3

3-5 weeks

75000

LM1085IT-5.0

3

Full production

N/A

N/A

1K+

$0.61

rail
of
45

NSUZXYTT
LM1085
IT-5.0

3-5 weeks

75000

LM1085IT-ADJ

3

Full production

N/A

N/A

1K+

$0.61

rail
of
45

NSUZXYTT
LM1085
IT-ADJ

3-5 weeks

150000

LM1085IS-12

3

Full production

N/A

N/A

1K+

$0.61

rail
of
45

NSUZXYTT
LM1085
IS-12

13 weeks

0

LM1085IS-3.3

3

Full production

N/A

N/A

1K+

$0.61

rail
of
45

NSUZXYTT
LM1085
IS-3.3

13 weeks

0

LM1085IS-5.0

3

Full production

N/A

N/A

1K+

$0.61

rail
of
45

NSUZXYTT
LM1085
IS-5.0

13 weeks

0

LM1085IS-ADJ

3

Full production

N/A

N/A

1K+

$0.61

rail
of
45

NSUZXYTT
LM1085
IS-ADJ

14 weeks

0

LM1085ISX-12

3

Full production

N/A

N/A

1K+

$0.61

reel
of
500

NSUZXYTT
LM1085
IS-12

13 weeks

0

LM1085ISX-3.3

3

Full production

N/A

N/A

1K+

$0.61

reel
of
500

NSUZXYTT
LM1085
IS-3.3

14 weeks

0

LM1085ISX-5.0

3

Full production

N/A

N/A

1K+

$0.61

reel
of
500

NSUZXYTT
LM1085
IS-5.0

13 weeks

0

LM1085ISX-ADJ

3

Full production

N/A

N/A

1K+

$0.61

reel
of
500

NSUZXYTT
LM1085
IS-ADJ

14 weeks

0

LM1085I-3.3 MDC

Full production

N/A

N/A

tray
of
N/A

-

N/A

0

LM1085I-ADJ MDC

Full production

N/A

N/A

tray
of
N/A

-

N/A

0

LM1085I-3.3 MWC

Full production

N/A

N/A

wafer jar
of
N/A

-

N/A

0

LM1085I-ADJ MWC

Full production

N/A

N/A

wafer jar
of
N/A

-

N/A

0

General Description

The LM1085 is a series of low dropout positive voltage regulators with a maximum dropout of 1.5V at 3A of load current. It has the same pin-out as National Semiconductor's industry standard LM317.

The LM1085 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 integrate the adjust resistors.

The LM1085 circuit includes a zener trimmed bandgap reference, current limiting and thermal shutdown.

The LM1085 series is available in TO-220 and TO-263 packages. Refer to the LM1084 for the 5A version, and the LM1086 for the 1.5A version.

Features

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

Output Current	3A
Line Regulation	0.015% (typical)
Load Regulation	0.1% (typical)

Applications

High Efficiency Linear Regulators
Battery Charger
Post Regulation for Switching Supplies
Constant Current Regulator
Microprocessor Supply

Reliability Metrics

Part Number	Process	Early Failure Rate - Rejects	Sample Size (EFR)	PPM *	Rel. Rejects	Device Hours	Long Term Failure Rates (FITS)	MTTF
LM1085I-3.3 MDC	LB300	0	17700	0	0	1100000	4	311012542
LM1085I-3.3 MWC	LB300	0	17700	0	0	1100000	4	311012542
LM1085I-ADJ MDC	LB300	0	17700	0	0	1100000	4	311012542
LM1085I-ADJ MWC	LB300	0	17700	0	0	1100000	4	311012542
LM1085IS-12	LB300	0	17700	0	0	1100000	4	311012542
LM1085IS-3.3	LB300	0	17700	0	0	1100000	4	311012542
LM1085IS-5.0	LB300	0	17700	0	0	1100000	4	311012542
LM1085IS-ADJ	LB300	0	17700	0	0	1100000	4	311012542
LM1085ISX-12	LB300	0	17700	0	0	1100000	4	311012542
LM1085ISX-3.3	LB300	0	17700	0	0	1100000	4	311012542
LM1085ISX-5.0	LB300	0	17700	0	0	1100000	4	311012542
LM1085ISX-ADJ	LB300	0	17700	0	0	1100000	4	311012542
LM1085IT-12	LB300	0	17700	0	0	1100000	4	311012542
LM1085IT-3.3	LB300	0	17700	0	0	1100000	4	311012542
LM1085IT-5.0	LB300	0	17700	0	0	1100000	4	311012542
LM1085IT-ADJ	LB300	0	17700	0	0	1100000	4	311012542

For more information on Reliablitity Metrics, please click here.

Design Tools

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

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Application Notes

Title	Size in Kbytes	Date	View Online	Download	Receive via Email
AN-1148: Application Note 1148 Linear Regulators: Theory of Operation and Compensation	200 Kbytes	25-Sep-02	View Online	Download	Receive via Email

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

[Information as of 15-Jan-2004]