SNVS100F March   2000  – July 2014 LM2937

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  Handling Ratings
    3. 6.3  Recommended Operating Conditions
    4. 6.4  Thermal Information
    5. 6.5  Electrical Characteristics: LM2937-5
    6. 6.6  Electrical Characteristics: LM2937-8
    7. 6.7  Electrical Characteristics: LM2937-10
    8. 6.8  Electrical Characteristics: LM2937-12
    9. 6.9  Electrical Characteristics: LM2937-15
    10. 6.10 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 Thermal Shutdown (TSD)
      2. 7.3.2 Short Circuit Current Limit
      3. 7.3.3 Overvoltage Shutdown (OVSD)
    4. 7.4 Device Functional Modes
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 External Capacitors
        2. 8.2.2.2 Output Capacitor ESR
        3. 8.2.2.3 Heatsinking
        4. 8.2.2.4 Heatsinking TO-220 Package Parts
        5. 8.2.2.5 Heatsinking DDPAK/TO-263 and SOT-223 Package Parts
        6. 8.2.2.6 SOT-223 Soldering Recommendations
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Trademarks
    2. 11.2 Electrostatic Discharge Caution
    3. 11.3 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(1)(2)

over operating free-air temperature range (unless otherwise noted)
MIN MAX UNIT
Input voltage (VIN) Continuous 26 V
Transient (t ≤ 100 ms) 60
Internal power dissipation(3) Internally limited
Maximum junction temperature 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) The maximum allowable power dissipation at any ambient temperature is PMAX = (125°C − TA)/RθJA, where 125 is the maximum junction temperature for operation, TA is the ambient temperature, and RθJA is the junction-to-ambient thermal resistance. If this dissipation is exceeded, the die temperature will rise above 125°C and the electrical specifications do not apply. If the die temperature rises above 150°C, the LM2937 will go into thermal shutdown.

6.2 Handling Ratings

MIN MAX UNIT
Tstg Storage temperature range −65 150 °C
V(ESD) Electrostatic discharge Human body model (HBM), per ANSI/ESDA/JEDEC JS-001, all pins(1) –2000 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(1)

over operating free-air temperature range (unless otherwise noted)
MIN NOM MAX UNIT
Junction temperature (TJ) (2) LM2937ET (NDE), LM2937ES (KTT) −40 125 °C
LM2937IMP (DCY) −40 85
Input voltage (VIN) VOUT + 1V 26 V
(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) The maximum allowable power dissipation at any ambient temperature is PMAX = (125°C − TA)/RθJA, where 125°C is the maximum junction temperature for operation, TA is the ambient temperature, and RθJA is the junction-to-ambient thermal resistance. If this dissipation is exceeded, the die temperature will rise above 125°C and the electrical specifications do not apply. If the die temperature rises above 150°C, the LM2937 will go into thermal shutdown.

6.4 Thermal Information

THERMAL METRIC(1) LM2937 UNIT
NDE(2) KTT DCY
3 PINS 3 PINS 4 PINS
RθJA Junction-to-ambient thermal resistance 77.9 41.8 58.3 °C/W
RθJC(top) Junction-to-case (top) thermal resistance 35.5 43.5 39.2
RθJB Junction-to-board thermal resistance 70.6 0.8 N/A
ψJT Junction-to-top characterization parameter 13 23.5 7
ψJB Junction-to-board characterization parameter 70.6 10.3 1.6
RθJC(bot) Junction-to-case (bottom) thermal resistance 1 22.5 22.5
(1) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.
(2) Thermal information for the TO-220 package is for a free-standing package vertically mounted in the middle of a PCB which is compliant to the JEDEC HIGH-K 2s2p (JESD51-7) specifications. No additional heat sink is attached. See Heatsinking TO-220 Package Parts section for more information.

6.5 Electrical Characteristics: LM2937-5

Unless otherwise specified: VIN = VOUT(NOM) + 5 V; IOUT(MAX) = 500 mA for the TO-220 and DDPAK/TO-263 packages; IOUT(MAX) = 400 mA for the SOT-223 package; and COUT = 10 μF. Conditions and the associated minimum and maximum limits apply over the Recommended Operating temperature range for the specific package, unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNIT
Output voltage TA = TJ = 25°C, 5 mA ≤ IOUT ≤ IOUT(MAX) 4.85 5 5.15 V
5 mA ≤ IOUT ≤ IOUT(MAX) 4.75 5 5.25 V
Line regulation (VOUT + 2 V) ≤ VIN ≤ 26 V, IOUT = 5 mA 15 50 mV
Load regulation 5 mA ≤ IOUT ≤ IOUT(MAX) 5 50 mV
Quiescent Current (VOUT + 2 V) ≤ VIN ≤ 26 V, IOUT = 5 mA 2 10 mA
VIN = (VOUT + 5 V), IOUT = IOUT(MAX) 10 20 mA
Output noise voltage 10 Hz to 100 kHz, IOUT = 5 mA 150 μVrms
Long-term stability 1000 Hrs. 20 mV
Dropout voltage IOUT = IOUT(MAX) 0.5 1 V
IOUT = 50 mA 110 250 mV
Short-circuit current 0.6 1 A
Peak line transient voltage tf < 100 ms, RL = 100 Ω 60 75 V
Maximum operational input voltage 26 V
Reverse DC input voltage VOUT ≥ −0.6 V, RL = 100 Ω –15 –30 V
Reverse transient input voltage tr < 1 ms, RL = 100 Ω –50 –75 V

6.6 Electrical Characteristics: LM2937-8

Unless otherwise specified: VIN = VOUT(NOM) + 5 V; IOUT(MAX) = 500 mA for the TO-220 and DDPAK/TO-263 packages; IOUT(MAX) = 400 mA for the SOT-223 package; and COUT = 10 μF. Conditions and the associated Minimum and Maximum limits apply over the Recommended Operating temperature range for the specific package, unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNIT
Output voltage TA = TJ = 25°C, 5 mA ≤ IOUT ≤ IOUT(MAX) 7.76 8 8.24 V
5 mA ≤ IOUT ≤ IOUT(MAX) 7.6 8 8.4 V
Line regulation (VOUT + 2 V) ≤ VIN ≤ 26 V, IOUT = 5 mA 24 80 mV
Load regulation 5 mA ≤ IOUT ≤ IOUT(MAX) 8 80 mV
Quiescent Current (VOUT + 2 V) ≤ VIN ≤ 26 V, IOUT = 5 mA 2 10 mA
VIN = (VOUT + 5 V), IOUT = IOUT(MAX) 10 20 mA
Output noise voltage 10 Hz to 100 kHz, IOUT = 5 mA 240 μVrms
Long-term stability 1000 Hrs. 32 mV
Dropout voltage IOUT = IOUT(MAX) 0.5 1 V
IOUT = 50 mA 110 250 mV
Short-circuit current 0.6 1 A
Peak line transient voltage tf < 100 ms, RL = 100 Ω 60 75 V
Maximum operational input voltage 26 V
Reverse DC input voltage VOUT ≥ −0.6 V, RL = 100 Ω –15 –30 V
Reverse transient input voltage tr < 1 ms, RL = 100 Ω –50 –75 V

6.7 Electrical Characteristics: LM2937-10

Unless otherwise specified: VIN = VOUT(NOM) + 5 V; IOUT(MAX) = 500 mA for the TO-220 and DDPAK/TO-263 packages; IOUT(MAX) = 400 mA for the SOT-223 package; and COUT = 10 μF. Conditions and the associated Minimum and Maximum limits apply over the Recommended Operating temperature range for the specific package, unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNIT
Output voltage TA = TJ = 25°C, 5 mA ≤ IOUT ≤ IOUT(MAX) 9.7 10 10.3 V
5 mA ≤ IOUT ≤ IOUT(MAX) 9.5 10 10.5 V
Line regulation (VOUT + 2V) ≤ VIN ≤ 26V, IOUT = 5 mA 30 100 mV
Load regulation 5 mA ≤ IOUT ≤ IOUT(MAX) 10 100 mV
Quiescent Current (VOUT + 2V) ≤ VIN ≤ 26V, IOUT = 5 mA 2 10 mA
VIN = (VOUT + 5V), IOUT = IOUT(MAX) 10 20 mA
Output noise voltage 10 Hz to 100 kHz, IOUT = 5 mA 300 μVrms
Long-term stability 1000 Hrs. 40 mV
Dropout voltage IOUT = IOUT(MAX) 0.5 1 V
IOUT = 50 mA 110 250 mV
Short-circuit current 0.6 1 A
Peak line transient voltage tf < 100 ms, RL = 100 Ω 60 75 V
Maximum operational input voltage 26 V
Reverse DC input voltage VOUT ≥ −0.6 V, RL = 100 Ω –15 –30 V
Reverse transient input voltage tr < 1 ms, RL = 100 Ω –50 –75 V

6.8 Electrical Characteristics: LM2937-12

Unless otherwise specified: VIN = VOUT(NOM) + 5 V; IOUT(MAX) = 500 mA for the TO-220 and DDPAK/TO-263 packages; IOUT(MAX) = 400 mA for the SOT-223 package; and COUT = 10 μF. Conditions and the associated Minimum and Maximum limits apply over the Recommended Operating temperature range for the specific package, unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNIT
Output voltage TA = TJ = 25°C, 5 mA ≤ IOUT ≤ IOUT(MAX) 11.64 12 12.36 V
5 mA ≤ IOUT ≤ IOUT(MAX) 11.4 12 12.6 V
Line regulation (VOUT + 2V) ≤ VIN ≤ 26V, IOUT = 5 mA 36 120 mV
Load regulation 5 mA ≤ IOUT ≤ IOUT(MAX) 12 120 mV
Quiescent Current (VOUT + 2V) ≤ VIN ≤ 26V, IOUT = 5 mA 2 10 mA
VIN = (VOUT + 5V), IOUT = IOUT(MAX) 10 20 mA
Output noise voltage 10 Hz to 100 kHz, IOUT = 5 mA 360 μVrms
Long-term stability 1000 Hrs. 44 mV
Dropout voltage IOUT = IOUT(MAX) 0.5 1 V
IOUT = 50 mA 110 250 mV
Short-circuit current 0.6 1 A
Peak line transient voltage tf < 100 ms, RL = 100 Ω 60 75 V
Maximum operational input voltage 26 V
Reverse DC input voltage VOUT ≥ −0.6 V, RL = 100 Ω –15 –30 V
Reverse transient input voltage tr < 1 ms, RL = 100 Ω –50 –75 V

6.9 Electrical Characteristics: LM2937-15

Unless otherwise specified: VIN = VOUT(NOM) + 5 V; IOUT(MAX) = 500 mA for the TO-220 and DDPAK/TO-263 packages; IOUT(MAX) = 400 mA for the SOT-223 package; and COUT = 10 μF. Conditions and the associated Minimum and Maximum limits apply over the Recommended Operating temperature range for the specific package, unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNIT
Output voltage TA = TJ = 25°C, 5 mA ≤ IOUT ≤ IOUT(MAX) 14.55 15 15.45 V
5 mA ≤ IOUT ≤ IOUT(MAX) 14.25 15 15.75 V
Line regulation (VOUT + 2V) ≤ VIN ≤ 26V, IOUT = 5 mA 45 150 mV
Load regulation 5 mA ≤ IOUT ≤ IOUT(MAX) 15 150 mV
Quiescent Current (VOUT + 2V) ≤ VIN ≤ 26V, IOUT = 5 mA 2 10 mA
VIN = (VOUT + 5V), IOUT = IOUT(MAX) 10 20 mA
Output noise voltage 10 Hz to 100 kHz, IOUT = 5 mA 450 μVrms
Long-term stability 1000 Hrs. 56 mV
Dropout voltage IOUT = IOUT(MAX) 0.5 1 V
IOUT = 50 mA 110 250 mV
Short-circuit current 0.6 1 A
Peak line transient voltage tf < 100 ms, RL = 100 Ω 60 75 V
Maximum operational input voltage 26 V
Reverse DC input voltage VOUT ≥ −0.6 V, RL = 100 Ω –15 –30 V
Reverse transient input voltage tr < 1 ms, RL = 100 Ω –50 –75 V

6.10 Typical Characteristics

01128007.pngFigure 1. Dropout Voltage vs. Output Current
01128009.pngFigure 3. Output Voltage vs. Temperature
01128011.pngFigure 5. Quiescent Current vs. Input Voltage
01128013.pngFigure 7. Line Transient Response
01128015.pngFigure 9. Ripple Rejection
01128017.pngFigure 11. Maximum Power Dissipation (TO-220)1
01128019.pngFigure 13. Low-Voltage Behavior
01128022.pngFigure 15. Output at Voltage Extremes
01128025.pngFigure 17. Peak Output Current
01128008.pngFigure 2. Dropout Voltage vs. Temperature
01128010.pngFigure 4. Quiescent Current vs. Temperature
01128012.pngFigure 6. Quiescent Current vs. Output Current
01128014.pngFigure 8. Load Transient Response
01128016.pngFigure 10. Output Impedence
01128018.pngFigure 12. Maximum Power Dissipation (DDPAK/TO-263)
1. The maximum allowable power dissipation at any ambient temperature is PMAX = (125°C − TA)/RθJA, where 125 is the maximum junction temperature for operation, TA is the ambient temperature, and RθJA is the junction-to-ambient thermal resistance. If this dissipation is exceeded, the die temperature will rise above 125°C and the electrical specifications do not apply. If the die temperature rises above 150°C, the LM2937 will go into thermal shutdown.
01128020.pngFigure 14. Low-Voltage Behavior
01128024.pngFigure 16. Output Capacitor ESR