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N/C

OUT

ADJ/GND

N/C

OUT

LM1086

www.ti.com

SNVS039H –JUNE 2000–REVISED MAY 2013

LM1086 1.5A Low Dropout Positive Regulators

Check for Samples: LM1086

FEATURES

DESCRIPTION

The LM1086 is a series of low dropout positive

• Available in 1.8V, 2.5V, 2.85V, 3.3V, 3.45V, 5V

voltage regulators with a maximum dropout of 1.5V at

and Adjustable Versions

1.5A of load current. It has the same pin-out as TI's

• Current Limiting and Thermal Protection

industry standard LM317.

• Output Current 1.5A

The LM1086 is available in an adjustable version,

• Line Regulation 0.015% (typical)

which can set the output voltage with only two

external resistors. It is also available in six fixed

• Load Regulation 0.1% (typical)

voltages: 1.8V, 2.5V, 2.85V, 3.3V, 3.45V and 5.0V.

The fixed versions integrate the adjust resistors.

APPLICATIONS

The LM1086 circuit includes a zener trimmed

• SCSI-2 Active Terminator

bandgap reference, current limiting and thermal

• High Efficiency Linear Regulators

shutdown.

• Battery Charger

• Post Regulation for Switching Supplies

• Constant Current Regulator

• Microprocessor Supply

Connection Diagram

Pins 6, 7, and 8 must be tied together.

Figure 1. TO-220 Figure 2. DDPAK/TO-263 Figure 3. WSON

Top View Top View Top View

Figure 4. Basic Functional Diagram, Figure 5. Application Circuit

Adjustable Version 1.2V to 15V Adjustable Regulator

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (24 pages)

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LM1086 www.ti.com SNVS039H – JUNE 2000 – REVISED MAY 2013 LM1086 1.5A Low Dropout Positive Regulators Check for Samples: LM1086 FEATURES DESCRIPTION • The LM1086 is a series of low dropout positive voltage regulators with a maximum dropout of 1.5V at 1.5A of load current. It has the same pin-out as TI's industry standard LM317. 1 2 • • • • Available in 1.8V, 2.5V, 2.85V, 3.3V, 3.45V, 5V and Adjustable Versions Current Limiting and Thermal Protection Output Current 1.5A Line Regulation 0.
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LM1086 SNVS039H – JUNE 2000 – REVISED MAY 2013 www.ti.
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LM1086 www.ti.com SNVS039H – JUNE 2000 – REVISED MAY 2013 These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. Absolute Maximum Ratings (1) (2) Maximum Input-to-Output Voltage Differential LM1086-ADJ 29V LM1086-1.8 27V LM1086-2.5 27V LM1086-2.85 27V LM1086-3.3 27V LM1086-3.45 27V LM1086-5.
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LM1086 SNVS039H – JUNE 2000 – REVISED MAY 2013 www.ti.com Electrical Characteristics Typicals and limits appearing in normal type apply for TJ = 25°C. Limits appearing in Boldface type apply over the entire junction temperature range for operation. Symbol VREF VOUT ΔVOUT ΔVOUT Reference Voltage Output Voltage (3) Line Regulation (4) Load Regulation (4) Dropout Voltage (5) (1) (2) (3) (4) (5) 4 Min Typ Max (1) Units LM1086-ADJ IOUT = 10mA, VIN−VOUT = 3V 10mA ≤IOUT ≤ IFULL LOAD, 1.
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LM1086 www.ti.com SNVS039H – JUNE 2000 – REVISED MAY 2013 Electrical Characteristics (continued) Typicals and limits appearing in normal type apply for TJ = 25°C. Limits appearing in Boldface type apply over the entire junction temperature range for operation. Symbol ILIMIT Min Typ LM1086-ADJ VIN−VOUT = 5V VIN−VOUT = 25V 1.50 0.05 2.7 0.15 A A LM1086-1.8,2.5, 2.85, 3.3, 3.45, VIN = 8V 1.5 2.7 A LM1086-5.0, VIN = 10V 1.5 2.
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LM1086 SNVS039H – JUNE 2000 – REVISED MAY 2013 www.ti.com Typical Performance Characteristics 6 Dropout Voltage vs. Output Current Short-Circuit Current vs. Input/Output Difference Figure 6. Figure 7. Load Regulation vs. Temperature Percent Change in Output Voltage vs. Temperature Figure 8. Figure 9. Adjust Pin Current vs. Temperature Maximum Power Dissipation vs. Temperature Figure 10. Figure 11.
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LM1086 www.ti.com SNVS039H – JUNE 2000 – REVISED MAY 2013 Typical Performance Characteristics (continued) Ripple Rejection vs. Frequency (LM1086-Adj.) Ripple Rejection vs. Output Current (LM1086-Adj.) Figure 12. Figure 13. Ripple Rejection vs. Frequency (LM1086-5) Ripple Rejection vs. Output Current (LM1086-5) Figure 14. Figure 15. Line Transient Response Load Transient Response Figure 16. Figure 17.
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LM1086 SNVS039H – JUNE 2000 – REVISED MAY 2013 www.ti.com APPLICATION NOTE GENERAL Figure 18 shows a basic functional diagram for the LM1086-Adj (excluding protection circuitry) . The topology is basically that of the LM317 except for the pass transistor. Instead of a Darlingtion NPN with its two diode voltage drop, the LM1086 uses a single NPN. This results in a lower dropout voltage. The structure of the pass transistor is also known as a quasi LDO.
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LM1086 www.ti.com SNVS039H – JUNE 2000 – REVISED MAY 2013 The Aluminum electrolytic are less expensive than tantalums, but their ESR varies exponentially at cold temperatures; therefore requiring close examination when choosing the desired transient response over temperature. Tantalums are a convenient choice because their ESR varies less than 2:1 over temperature. The recommended load/decoupling capacitance is a 10uF tantalum or a 50uF aluminum.
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LM1086 SNVS039H – JUNE 2000 – REVISED MAY 2013 www.ti.com When the adjustable regulator is used (Figure 21), the best performance is obtained with the positive side of the resistor R1 tied directly to the output terminal of the regulator rather than near the load. This eliminates line drops from appearing effectively in series with the reference and degrading regulation. For example, a 5V regulator with 0.
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LM1086 www.ti.com SNVS039H – JUNE 2000 – REVISED MAY 2013 OVERLOAD RECOVERY Overload recovery refers to regulator's ability to recover from a short circuited output. A key factor in the recovery process is the current limiting used to protect the output from drawing too much power. The current limiting circuit reduces the output current as the input to output differential increases. Refer to short circuit curve in the Typical Performance Characteristics section.
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LM1086 SNVS039H – JUNE 2000 – REVISED MAY 2013 www.ti.com The required heat sink is determined by calculating its required thermal resistance (θHA(max)). θHA(max) = θJA(max) − (θJC + θCH) θHA (max) should be calculated twice as follows: θHA (max) = θJA(max, CONTROL SECTION) - (θJC (CONTROL SECTION) + θCH) θHA (max)= θJA(max, OUTPUT SECTION) - (θJC(OUTPUT SECTION) + θCH) If thermal compound is used, θCH can be estimated at 0.2 C/W.
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LM1086 www.ti.com SNVS039H – JUNE 2000 – REVISED MAY 2013 Figure 27. 1.2V to 15V Adjustable Regulator Figure 28. 5V Regulator with Shutdown Figure 29. Battery Charger Figure 30. Adjustable Fixed Regulator Figure 31. Regulator with Reference Figure 32. High Current Lamp Driver Protection Figure 33. Battery Backup Regulated Supply Figure 34.
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LM1086 SNVS039H – JUNE 2000 – REVISED MAY 2013 www.ti.com Figure 35. Automatic Light control Figure 36. Remote Sensing Figure 37.
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LM1086 www.ti.com SNVS039H – JUNE 2000 – REVISED MAY 2013 REVISION HISTORY Changes from Revision G (May 2013) to Revision H • Page Changed layout of National Data Sheet to TI format ..........................................................................................................
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PACKAGE OPTION ADDENDUM www.ti.com 1-Nov-2013 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Pins Package Drawing Qty Eco Plan Lead/Ball Finish MSL Peak Temp (2) (6) (3) Op Temp (°C) Device Marking (4/5) LM1086CS-2.5/NOPB ACTIVE DDPAK/ TO-263 KTT 3 45 Pb-Free (RoHS Exempt) CU SN Level-3-245C-168 HR LM1086CS-3.3/NOPB ACTIVE DDPAK/ TO-263 KTT 3 45 Pb-Free (RoHS Exempt) CU SN Level-3-245C-168 HR LM1086CS-5.
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PACKAGE OPTION ADDENDUM www.ti.com Orderable Device 1-Nov-2013 Status (1) Package Type Package Pins Package Drawing Qty Eco Plan Lead/Ball Finish MSL Peak Temp (2) (6) (3) Op Temp (°C) Device Marking (4/5) LM1086IS-5.0/NOPB ACTIVE DDPAK/ TO-263 KTT 3 45 Pb-Free (RoHS Exempt) CU SN Level-3-245C-168 HR -40 to 125 LM1086 IS-5.0 LM1086IS-ADJ/NOPB ACTIVE DDPAK/ TO-263 KTT 3 45 Pb-Free (RoHS Exempt) CU SN Level-3-245C-168 HR -40 to 125 LM1086 IS-ADJ LM1086ISX-1.
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PACKAGE OPTION ADDENDUM www.ti.com (4) 1-Nov-2013 There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device. (5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation of the previous line and the two combined represent the entire Device Marking for that device.
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PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant LM1086CSX-2.5/NOPB DDPAK/ TO-263 KTT 3 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2 LM1086CSX-3.3/NOPB DDPAK/ TO-263 KTT 3 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2 LM1086CSX-ADJ/NOPB DDPAK/ TO-263 KTT 3 500 330.0 24.4 10.
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PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LM1086CSX-2.5/NOPB DDPAK/TO-263 KTT 3 500 367.0 367.0 45.0 LM1086CSX-3.3/NOPB DDPAK/TO-263 KTT 3 500 367.0 367.0 45.0 LM1086CSX-ADJ/NOPB DDPAK/TO-263 KTT 3 500 367.0 367.0 45.0 LM1086ILD-3.3/NOPB WSON NGN 8 1000 213.0 191.0 55.0 LM1086ISX-1.8/NOPB DDPAK/TO-263 KTT 3 500 367.0 367.0 45.0 LM1086ISX-3.
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MECHANICAL DATA NDE0003B www.ti.
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MECHANICAL DATA NGN0008A LDC08A (Rev B) www.ti.
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MECHANICAL DATA KTT0003B TS3B (Rev F) BOTTOM SIDE OF PACKAGE www.ti.
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