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LM1084

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SNVS037F –SEPTEMBER 1999–REVISED MARCH 2013

LM1084 5A Low Dropout Positive Regulators

Check for Samples: LM1084

FEATURES

DESCRIPTION

The LM1084 is a series of low dropout voltage

• Available in 3.3V, 5.0V, 12V and Adjustable

positive regulators with a maximum dropout of 1.5V

Versions

at 5A of load current. It has the same pin-out as TI's

• Current Limiting and Thermal Protection

industry standard LM317.

• Output Current 5A

The LM1084 is available in an adjustable version,

• Industrial Temperature Range −40°C to 125°C

which can set the output voltage with only two

external resistors. It is also available in three fixed

• Line Regulation 0.015% (typical)

voltages: 3.3V, 5.0V and 12.0V. The fixed versions

• Load Regulation 0.1% (typical)

intergrate the adjust resistors.

APPLICATIONS

The LM1084 circuit includes a zener trimmed

bandgap reference, current limiting and thermal

• Post Regulator for Switching DC/DC Conveter

shutdown.

• High Efficiency Linear Regulators

• Battery Charger

Connection Diagram

Figure 1. TO-220 Top View Figure 2. DDPAK/TO-263 Top View

Figure 3. Basic Functional Diagram, Adjustable Figure 4. Application Circuit

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 (22 pages)

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LM1084 www.ti.com SNVS037F – SEPTEMBER 1999 – REVISED MARCH 2013 LM1084 5A Low Dropout Positive Regulators Check for Samples: LM1084 FEATURES 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 TI's industry standard LM317. 1 2 • • • • • Available in 3.3V, 5.
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LM1084 SNVS037F – SEPTEMBER 1999 – REVISED MARCH 2013 www.ti.com Simplified Schematic Figure 5.
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LM1084 www.ti.com SNVS037F – SEPTEMBER 1999 – REVISED MARCH 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 LM1084-ADJ 29V LM1084-12 18V LM1084-3.3 27V LM1084-5.
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LM1084 SNVS037F – SEPTEMBER 1999 – REVISED MARCH 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 Output Voltage (3) Line Regulation (4) Load Regulation (4) Dropout Voltage ILIMIT (1) (2) (3) (4) (5) (6) 4 Typ Max (1) Units 1.238 1.225 1.250 1.250 1.262 1.270 V V LM1084-3.3 IOUT = 0mA, VIN = 8V 0 ≤ IOUT ≤IFULL LOAD, 4.
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LM1084 www.ti.com SNVS037F – SEPTEMBER 1999 – REVISED MARCH 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 Parameter Conditions Thermal Regulation TA = 25°C, 30ms Pulse Ripple Rejection fRIPPLE = 120Hz, = COUT = 25µF Tantalum, IOUT = 5A Min (1) Typ Max (1) Units 0.003 0.
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LM1084 SNVS037F – SEPTEMBER 1999 – REVISED MARCH 2013 www.ti.com Typical Performance Characteristics 6 Dropout Voltage (VIN−VOUT) Short-Circuit Current Figure 6. Figure 7. Load Regulation LM1084-ADJ Ripple Rejection Figure 8. Figure 9.
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LM1084 www.ti.com SNVS037F – SEPTEMBER 1999 – REVISED MARCH 2013 Typical Performance Characteristics (continued) LM1084-ADJ Ripple Rejection vs Current Temperature Stability Figure 10. Figure 11. Adjust Pin Current LM1084-ADJ Load Transient Response Figure 12. Figure 13. LM1084-ADJ LineTransient Response Maximum Power Dissipation Figure 14. Figure 15.
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LM1084 SNVS037F – SEPTEMBER 1999 – REVISED MARCH 2013 www.ti.com APPLICATION NOTE GENERAL Figure 16 shows a basic functional diagram for the LM1084-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 LM1084 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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LM1084 www.ti.com SNVS037F – SEPTEMBER 1999 – REVISED MARCH 2013 The adjustable versions allows an additional capacitor to be used at the ADJ pin to increase ripple rejection. If this is done the output capacitor should be increased to 22uF for tantalums or to 150uF for aluminum. Capacitors other than tantalum or aluminum can be used at the adjust pin and the input pin. A 10uF capacitor is a reasonable value at the input. See RIPPLE REJECTION section regarding the value for the adjust pin capacitor.
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LM1084 SNVS037F – SEPTEMBER 1999 – REVISED MARCH 2013 www.ti.com Figure 19. Best Load Regulation using Adjustable Output Regulator PROTECTION DIODES Under normal operation, the LM1084 regulator does not need any protection diode. With the adjustable device, the internal resistance between the adjustment and output terminals limits the current. No diode is needed to divert the current around the regulator even with a capacitor on the adjustment terminal.
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LM1084 www.ti.com SNVS037F – SEPTEMBER 1999 – REVISED MARCH 2013 THERMAL CONSIDERATIONS ICs heats up when in operation, and power consumption is one factor in how hot it gets. The other factor is how well the heat is dissipated. Heat dissipation is predictable by knowing the thermal resistance between the IC and ambient (θJA). Thermal resistance has units of temperature per power (C/W). The higher the thermal resistance, the hotter the IC.
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LM1084 SNVS037F – SEPTEMBER 1999 – REVISED MARCH 2013 www.ti.com Figure 22. Heat sink thermal Resistance vs Area Typical Applications 12 Figure 23. 5V to 3.3V, 5A Regulator Figure 24. Adjustable @ 5V Figure 25. 1.2V to 15V Adjustable Regulator Figure 26.
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LM1084 www.ti.com SNVS037F – SEPTEMBER 1999 – REVISED MARCH 2013 Figure 27. Battery Charger Figure 28. Adjustable Fixed Regulator Figure 29. Regulator with Reference Figure 30. High Current Lamp Driver Protection Figure 31. Battery Backup Regulated Supply Figure 32.
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LM1084 SNVS037F – SEPTEMBER 1999 – REVISED MARCH 2013 www.ti.com Figure 33. Automatic Light control Figure 34. Generating Negative Supply voltage Figure 35.
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LM1084 www.ti.
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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) LM1084IS-3.3/NOPB ACTIVE DDPAK/ TO-263 KTT 3 45 Pb-Free (RoHS Exempt) CU SN Level-3-245C-168 HR -40 to 125 LM1084 IS-3.3 LM1084IS-5.0/NOPB ACTIVE DDPAK/ TO-263 KTT 3 45 Pb-Free (RoHS Exempt) CU SN Level-3-245C-168 HR -40 to 125 LM1084 IS-5.
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PACKAGE OPTION ADDENDUM www.ti.com 1-Nov-2013 (3) MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. (4) 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.
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PACKAGE MATERIALS INFORMATION www.ti.com 26-Mar-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 LM1084ISX-3.3/NOPB DDPAK/ TO-263 KTT 3 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2 LM1084ISX-5.0/NOPB DDPAK/ TO-263 KTT 3 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2 LM1084ISX-ADJ/NOPB DDPAK/ TO-263 KTT 3 500 330.0 24.4 10.
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PACKAGE MATERIALS INFORMATION www.ti.com 26-Mar-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LM1084ISX-3.3/NOPB DDPAK/TO-263 KTT 3 500 367.0 367.0 45.0 LM1084ISX-5.0/NOPB DDPAK/TO-263 KTT 3 500 367.0 367.0 45.0 LM1084ISX-ADJ/NOPB DDPAK/TO-263 KTT 3 500 367.0 367.0 45.
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MECHANICAL DATA NDE0003B www.ti.
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MECHANICAL DATA KTT0003B TS3B (Rev F) BOTTOM SIDE OF PACKAGE www.ti.
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