SNVS038H July   1999  – January 2015 LM1085

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Ripple Rejection
      2. 7.3.2 Load Regulation
      3. 7.3.3 Overload Recovery
    4. 7.4 Device Functional Modes
      1. 7.4.1 Output Voltage
      2. 7.4.2 Stability Consideration
      3. 7.4.3 Protection Diodes
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1  1.2-V to 15-V Adjustable Regulator
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
        3. 8.2.1.3 Application Curve
      2. 8.2.2  Adjustable at 5 V
      3. 8.2.3  5-V Regulator with Shutdown
      4. 8.2.4  Battery Charger
      5. 8.2.5  Adjustable Fixed Regulator
      6. 8.2.6  Regulator with Reference
      7. 8.2.7  High Current Lamp Driver Protection
      8. 8.2.8  Battery Backup Regulated Supply
      9. 8.2.9  Ripple Rejection Enhancement
      10. 8.2.10 Automatic Light Control
      11. 8.2.11 Generating Negative Supply Voltage
      12. 8.2.12 Remote Sensing
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
    3. 10.3 Thermal Considerations
  11. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 Trademarks
    3. 11.3 Electrostatic Discharge Caution
    4. 11.4 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

6 Specifications

6.1 Absolute Maximum Ratings

over operating free-air temperature range (unless otherwise noted) (1)(2)
MIN MAX UNIT
Maximum Input to Output Voltage Differential
LM1085-ADJ 29 V
LM1085-12 18 V
LM1085-3.3 27 V
LM1085-5.0 25 V
Power Dissipation (1) Internally Limited V
Junction Temperature (TJ)(2) 150 °C
Lead Temperature 260, to 10 sec °C
Storage temperature range, Tstg –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.

6.2 ESD Ratings

VALUE UNIT
V(ESD) Electrostatic discharge Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001(1) ±2000 V
(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.

6.3 Recommended Operating Conditions

over operating free-air temperature range (unless otherwise noted)
MIN MAX UNIT
Junction Temperature (TJ)(2) −40 125 °C

6.4 Thermal Information

THERMAL METRIC(1) LM1085 UNIT
KTT NDE
3 PINS 3 PINS
RθJA Junction-to-ambient thermal resistance 40.6 22.8 °C/W
RθJC(top) Junction-to-case (top) thermal resistance 43.0 15.6
RθJB Junction-to-board thermal resistance 23.1 4.2
ψJT Junction-to-top characterization parameter 9.9 2.2
ψJB Junction-to-board characterization parameter 22.1 4.2
RθJC(bot) Junction-to-case (bottom) thermal resistance 0.7 0.7
(1) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.

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(4) TYP(3) MAX(4) UNIT
VREF Reference Voltage
(5)		 LM1085-ADJ, IOUT = 10 mA, VIN − VOUT = 3 V, 10 mA ≤ IOUT ≤ IFULL LOAD,1.5 V ≤ (VIN−VOUT) ≤ 15 V   1.238   1.250   1.262 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 1.225 1.250 1.270
VOUT Output Voltage
(5)		 LM1085-3.3, IOUT = 0 mA, VIN = 5 V, 0 ≤ IOUT ≤ IFULL LOAD, 4.8 V ≤ VIN ≤ 15 V   3.270   3.300   3.330 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 3.235 3.300 3.365
LM1085-5.0, IOUT = 0 mA, VIN = 8 V, 0 ≤ IOUT ≤ IFULL LOAD, 6.5 V ≤ VIN ≤ 20 V   4.950   5.000   5.050 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 4.900 5.000 5.100
LM1085-12, IOUT = 0 mA, VIN = 15 V, 0 ≤ IOUT ≤ IFULL LOAD, 13.5 V ≤ VIN ≤ 25 V   11.880   12.000   12.120 V
LM1085-12, IOUT = 0 mA, VIN = 15 V, 0 ≤ IOUT ≤ IFULL LOAD, 13.5 V ≤ VIN ≤ 25 V, –40°C ≤ TJ ≤ 125°C 11.760 12.000 12.240
ΔVOUT Line Regulation
(6)		 LM1085-ADJ, IOUT =10 mA, 1.5 V ≤ (VIN-VOUT) ≤ 15 V 0.015 0.2
LM1085-ADJ, IOUT =10 mA, 1.5 V ≤ (VIN-VOUT) ≤ 15 V, –40°C ≤ TJ ≤ 125°C 0.035 0.2
LM1085-3.3, IOUT = 0 mA, 4.8 V ≤ VIN ≤ 15 V 0.5 6 mV
LM1085-3.3, IOUT = 0 mA, 4.8 V ≤ VIN ≤ 15 V, –40°C ≤ TJ ≤ 125°C 1.0 6
LM1085-5.0, IOUT = 0 mA, 6.5 V ≤ VIN ≤ 20 V 0.5 10 mV
LM1085-5.0, IOUT = 0 mA, 6.5 V ≤ VIN ≤ 20 V, –40°C ≤ TJ ≤ 125°C 1.0 10
LM1085-12, I OUT = 0 mA, 13.5 V ≤ VIN ≤ 25 V 1.0 25 mV
LM1085-12, I OUT = 0 mA, 13.5 V ≤ VIN ≤ 25 V, –40°C ≤ TJ ≤ 125°C 2.0 25
ΔVOUT Load Regulation
(6)		 LM1085-ADJ, (VIN-V OUT) = 3 V, 10 mA ≤ IOUT ≤ IFULL LOAD 0.1 0.3
LM1085-ADJ, (VIN-V OUT) = 3 V, 10 mA ≤ IOUT ≤ IFULL LOAD, –40°C ≤ TJ ≤ 125°C 0.2 0.4
LM1085-3.3, VIN = 5 V, 0 ≤ IOUT ≤ IFULL LOAD 3 15 mV
LM1085-3.3, VIN = 5 V, 0 ≤ IOUT ≤ IFULL LOAD, –40°C ≤ TJ ≤ 125°C 7 20
LM1085-5.0, VIN = 8 V, 0 ≤ IOUT ≤ IFULL LOAD 5 20 mV
LM1085-5.0, VIN = 8 V, 0 ≤ IOUT ≤ IFULL LOAD, –40°C ≤ TJ ≤ 125°C 10 35
LM1085-12, VIN = 15 V, 0 ≤ IOUT ≤ IFULL LOAD 12 36 mV
LM1085-12, VIN = 15 V, 0 ≤ IOUT ≤ IFULL LOAD, –40°C ≤ TJ ≤ 125°C 24 72
VDO Dropout Voltage (7) LM1085-ADJ, 3.3, 5, 12, ΔVREF, ΔVOUT = 1%, IOUT = 3A, –40°C ≤ TJ ≤ 125°C   1.3   1.5 V
ILIMIT Current Limit LM1085-ADJ, VIN−VOUT = 5 V, –40°C ≤ TJ ≤ 125°C 3.2 5.5 A
LM1085-ADJ, VIN−VOUT = 25 V, –40°C ≤ TJ ≤ 125°C 0.2 0.5
LM1085-3.3, VIN = 8.0 V, –40°C ≤ TJ ≤ 125°C 3.2 5.5 A
LM1085-5.0, VIN = 10 V, –40°C ≤ TJ ≤ 125°C 3.2 5.5 A
LM1085-12, VIN = 17 V, –40°C ≤ TJ ≤ 125°C 3.2 5.5 A
Minimum Load Current (8) LM1085-ADJ, VIN −VOUT = 25 V, –40°C ≤ TJ ≤ 125°C 5.0 10.0 mA
IGND Quiescent Current LM1085-3.3, VIN ≤ 18 V, –40°C ≤ TJ ≤ 125°C 5.0 10.0 mA
LM1085-5.0, VIN ≤ 20 V, –40°C ≤ TJ ≤ 125°C 5.0 10.0 mA
LM1085-12, VIN ≤ 25 V, –40°C ≤ TJ ≤ 125°C 5.0 10.0 mA
Thermal Regulation TA = 25°C, 30ms Pulse .004 0.02 %/W
Ripple Rejection fRIPPLE = 120Hz, COUT = 25µF Tantalum, IOUT = 3A, LM1085-ADJ, CADJ = 25µF, (VIN−VO) = 3 V, –40°C ≤ TJ ≤ 125°C   60   75   dB
LM1085-3.3, VIN = 6.3 V, –40°C ≤ TJ ≤ 125°C 60 72 dB
LM1085-5.0, VIN = 8.0 V, –40°C ≤ TJ ≤ 125°C 60 68 dB
LM1085-12, VIN = 15 V, –40°C ≤ TJ ≤ 125°C 54 60 dB
IADJ Adjust Pin Current LM1085–ADJ 55 µA
LM1085–ADJ, –40°C ≤ TJ ≤ 125°C 120
ΔIADJ Adjust Pin Current Change LM1085–ADJ, 10mA ≤ IOUT ≤ IFULL LOAD, 1.5 V ≤ VIN−VOUT ≤ 25 V, –40°C ≤ TJ ≤ 125°C 0.2 5 µA
Temperature Stability –40°C ≤ TJ ≤ 125°C 0.5
Long Term Stability TA= 125°C, 1000 Hrs 0.3 1.0
RMS Output Noise (% of VOUT) 10Hz ≤ f ≤ 10 kHz 0.003
(1) Power dissipation is kept in a safe range by current limiting circuitry. Refer to Overload Recovery.
(2) The maximum power dissipation is a function of TJ(max) , θJA, and TA. The maximum allowable power dissipation at any ambient temperature is PD = (TJ(max)–T A)/θJA. All numbers apply for packages soldered directly into a PC board. Refer to Thermal Considerations in the Application Notes.
(3) Typical Values represent the most likely parametric norm.
(4) All limits are specified by testing or statistical analysis.
(5) 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.
(6) 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.
(7) Dropout voltage is specified over the full output current range of the device.
(8) The minimum output current required to maintain regulation.

6.6 Typical Characteristics

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Figure 1. Dropout Voltage vs Output Current
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Figure 3. Percent Change in Output Voltage vs Temperature
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Figure 5. Maximum Power Dissipation vs Temperature
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Figure 7. Ripple Rejection vs Output Current (LM1085-ADJ)
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Figure 9. Load Transient Response
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Figure 2. Short-Circuit Current vs Input/Output Difference
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Figure 4. Adjust Pin Current vs Temperature
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Figure 6. Ripple Rejection vs Frequency (LM1085-Adj.)
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Figure 8. Line Transient Response