LM1085 3-A Low Dropout Positive Regulators datasheet (Rev. H)

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LM1085

SNVS038H ? JULY 1999 ? REVISED JANUARY 2015

LM1085 3-A Low Dropout Positive Regulators

1 Features

?1 Available in 3.3-V, 5.0-V, 12-V and Adjustable Versions

? Current Limiting and Thermal Protection ? Output Current 3 A ? Line Regulation 0.015% (typical) ? Load Regulation 0.1% (typical)

2 Applications

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

3 Description

The LM1085 is a regulator with a maximum dropout of 1.5 V at 3 A of load current. It has the same pinout as TI's industry standard LM317.

Two resistors are required to set the output voltage of the adjustable output voltage version of the LM1085. Fixed output voltage versions integrate the adjust resistors.

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

Refer to the LM1084 for the 5A version, and the LM1086 for the 1.5A version.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

LM1085

DDPAK/TO-263 (3) 10.18 mm ? 8.41 mm

TO-220 (3)

14.986 mm ? 10.16 mm

(1) For all available packages, see the orderable addendum at the end of the datasheet.

Typical Application

1

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA.

LM1085

SNVS038H ? JULY 1999 ? REVISED JANUARY 2015



Table of Contents

1 Features .................................................................. 1 2 Applications ........................................................... 1 3 Description ............................................................. 1 4 Revision History..................................................... 2 5 Pin Configuration and Functions ......................... 3 6 Specifications......................................................... 4

6.1 Absolute Maximum Ratings ...................................... 4 6.2 ESD Ratings ............................................................ 4 6.3 Recommended Operating Conditions....................... 4 6.4 Thermal Information .................................................. 4 6.5 Electrical Characteristics........................................... 5 6.6 Typical Characteristics .............................................. 7 7 Detailed Description .............................................. 9 7.1 Overview ................................................................... 9 7.2 Functional Block Diagram ......................................... 9 7.3 Feature Description................................................. 10

7.4 Device Functional Modes........................................ 11 8 Application and Implementation ........................ 13

8.1 Application Information............................................ 13 8.2 Typical Applications ................................................ 13 9 Power Supply Recommendations...................... 20 10 Layout................................................................... 20 10.1 Layout Guidelines ................................................. 20 10.2 Layout Example .................................................... 20 10.3 Thermal Considerations ........................................ 20 11 Device and Documentation Support ................. 22 11.1 Documentation Support ........................................ 22 11.2 Trademarks ........................................................... 22 11.3 Electrostatic Discharge Caution ............................ 22 11.4 Glossary ................................................................ 22 12 Mechanical, Packaging, and Orderable Information ........................................................... 22

4 Revision History

NOTE: Page numbers for previous revisions may differ from page numbers in the current version.

Changes from Revision H (March 2013) to Revision I

Page

? Added ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Information section ................................................................................................. 4

Changes from Revision F (March 2013) to Revision G

Page

? Deleted layout of National Data Sheet to TI format.............................................................................................................. 19

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5 Pin Configuration and Functions

3-Pin TO-220 Top View

LM1085

SNVS038H ? JULY 1999 ? REVISED JANUARY 2015

3-Pin DDPAK/TO-263

Top View

NAME

PIN NO.

ADJ/GND

1

OUTPUT

2

INPUT

3

Pin Functions

I/O

DESCRIPTION

-

Adjust pin for the adjustable output voltage version. Ground pin for the fixed output voltage versions.

O

Output voltage pin for the regulator.

I

Input voltage pin for the regulator.

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LM1085

SNVS038H ? JULY 1999 ? REVISED JANUARY 2015



6 Specifications

6.1 Absolute Maximum Ratings

over operating free-air temperature range (unless otherwise noted) (1)(2)

Maximum Input to Output Voltage Differential LM1085-ADJ LM1085-12 LM1085-3.3 LM1085-5.0

Power Dissipation (3) Junction Temperature (TJ)(4) Lead Temperature Storage temperature range, Tstg

MIN

MAX

UNIT

29

V

18

V

27

V

25

V

Internally Limited

V

150

?C

260, to 10 sec

?C

?65

150

?C

(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

(2) If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/ Distributors for availability and specifications.

(3) Power dissipation is kept in a safe range by current limiting circuitry. Refer to Overload Recovery. (4) The maximum power dissipation is a function of TJ(max) , JA, and TA. The maximum allowable power dissipation at any ambient

temperature is PD = (TJ(max)?T A)/JA. All numbers apply for packages soldered directly into a PC board. Refer to Thermal Considerations in the Application Notes.

6.2 ESD Ratings

V(ESD) Electrostatic discharge

Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001(1)

VALUE ?2000

(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.

UNIT V

6.3 Recommended Operating Conditions

over operating free-air temperature range (unless otherwise noted) Junction Temperature (TJ)(1)

MIN

MAX

UNIT

-40

125

?C

(1) The maximum power dissipation is a function of TJ(max) , JA, and TA. The maximum allowable power dissipation at any ambient temperature is PD = (TJ(max)?T A)/JA. All numbers apply for packages soldered directly into a PC board. Refer to Thermal Considerations in the Application Notes.

6.4 Thermal Information

THERMAL METRIC(1)

LM1085

KTT

NDE

UNIT

3 PINS

3 PINS

RJA RJC(top) RJB JT JB RJC(bot)

Junction-to-ambient thermal resistance Junction-to-case (top) thermal resistance Junction-to-board thermal resistance Junction-to-top characterization parameter Junction-to-board characterization parameter Junction-to-case (bottom) thermal resistance

40.6

22.8

43.0

15.6

23.1

4.2

?C/W

9.9

2.2

22.1

4.2

0.7

0.7

(1) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.

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LM1085

SNVS038H ? JULY 1999 ? REVISED JANUARY 2015

6.5 Electrical Characteristics

Minimum and Maximum limits are ensured through test, design, or statistical correlation. Typical values represent the most

likely parametric norm at TJ = 25?C, and are provided for reference purposes only.

PARAMETER

TEST CONDITIONS

MIN (1)

TYP (2)

MAX(1) UNIT

VREF

Reference Voltage

(3)

LM1085-ADJ, IOUT = 10 mA, VIN - VOUT = 3 V, 10 mA IOUT IFULL LOAD,1.5 V (VIN-VOUT) 15 V

LM1085-ADJ, IOUT = 10 mA, VIN - VOUT = 3 V, 10 mA IOUT IFULL LOAD,1.5 V (VIN - VOUT) 15 V, ?40?C TJ 125?C

1.238 1.225

1.250 1.250

1.262

V 1.270

VOUT

Output Voltage

(3)

VOUT

Line Regulation

(4)

VOUT

Load Regulation

(4)

LM1085-3.3, IOUT = 0 mA, VIN = 5 V, 0 IOUT IFULL LOAD, 4.8 V VIN 15 V

LM1085-3.3, IOUT = 0 mA, VIN = 5 V, 0 IOUT IFULL LOAD, 4.8 V VIN 15 V, ?40?C TJ 125?C

LM1085-5.0, IOUT = 0 mA, VIN = 8 V, 0 IOUT IFULL LOAD, 6.5 V VIN 20 V

LM1085-5.0, IOUT = 0 mA, VIN = 8 V, 0 IOUT IFULL LOAD, 6.5 V VIN 20 V, ?40?C TJ 125?C

LM1085-12, IOUT = 0 mA, VIN = 15 V, 0 IOUT IFULL LOAD, 13.5 V VIN 25 V

LM1085-12, IOUT = 0 mA, VIN = 15 V, 0 IOUT IFULL LOAD, 13.5 V VIN 25 V, ?40?C TJ 125?C

LM1085-ADJ, IOUT =10 mA, 1.5 V (VIN-VOUT) 15 V

LM1085-ADJ, IOUT =10 mA, 1.5 V (VIN-VOUT) 15 V, ?40?C TJ 125?C

LM1085-3.3, IOUT = 0 mA, 4.8 V VIN 15 V

LM1085-3.3, IOUT = 0 mA, 4.8 V VIN 15 V, ?40?C TJ 125?C

LM1085-5.0, IOUT = 0 mA, 6.5 V VIN 20 V

LM1085-5.0, IOUT = 0 mA, 6.5 V VIN 20 V, ?40?C TJ 125?C

LM1085-12, I OUT = 0 mA, 13.5 V VIN 25 V

LM1085-12, I OUT = 0 mA, 13.5 V VIN 25 V, ?40?C TJ 125?C

LM1085-ADJ, (VIN-V OUT) = 3 V, 10 mA IOUT IFULL

LOAD

LM1085-ADJ, (VIN-V OUT) = 3 V, 10 mA IOUT IFULL LOAD, ?40?C TJ 125?C

LM1085-3.3, VIN = 5 V, 0 IOUT IFULL LOAD

LM1085-3.3, VIN = 5 V, 0 IOUT IFULL LOAD, ?40?C TJ 125?C

LM1085-5.0, VIN = 8 V, 0 IOUT IFULL LOAD

LM1085-5.0, VIN = 8 V, 0 IOUT IFULL LOAD, ?40?C TJ 125?C

3.270 3.235 4.950 4.900 11.880 11.760

3.300 3.300 5.000 5.000 12.000 12.000 0.015 0.035

0.5 1.0 0.5 1.0 1.0 2.0 0.1 0.2

3 7 5 10

3.330 V

3.365

5.050 V

5.100

12.120 V

12.240

0.2

0.2

6 mV

6

10 mV

10

25 mV

25

0.3

0.4

15 mV

20

20 mV

35

LM1085-12, VIN = 15 V, 0 IOUT IFULL LOAD

LM1085-12, VIN = 15 V, 0 IOUT IFULL LOAD, ?40?C TJ 125?C

VDO

Dropout Voltage (5)

LM1085-ADJ, 3.3, 5, 12, VREF, VOUT = 1%, IOUT = 3A, ?40?C TJ 125?C

12

36

mV

24

72

1.3

1.5 V

(1) All limits are specified by testing or statistical analysis. (2) Typical Values represent the most likely parametric norm. (3) IFULL LOAD is defined in the current limit curves. The IFULL LOAD Curve defines the current limit as a function of input-to-output voltage.

Note that 30W power dissipation for the LM1085 is only achievable over a limited range of input-to-output voltage. (4) Load and line regulation are measured at constant junction temperature, and are ensured up to the maximum power dissipation of 30W.

Power dissipation is determined by the input/output differential and the output current. Ensured maximum power dissipation will not be available over the full input/output range. (5) Dropout voltage is specified over the full output current range of the device.

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