BinKey

voltage-regulators-collection

5 min read

Important Note

This entire repo was AI created - including all of the data within. The intent was to A) help me with my personal electronics inventory; and B) see how I could use AI to make that process a bit easier. DO NOT TRUST!

Voltage Regulators Collection

Details

  • Location: Cabinet-3, Bin 23
  • Category: Power Management
  • Brands: Texas Instruments, STMicroelectronics
  • Total Quantity: 25+ regulators
  • Applications: Power supply design, voltage conversion, circuit protection

Description

Comprehensive collection of voltage regulators from leading manufacturers Texas Instruments and STMicroelectronics. This assortment includes both linear and switching regulators in various packages and output voltages, suitable for a wide range of power supply applications from low-power circuits to moderate power systems.

Texas Instruments Regulators

LM78xx Series - Fixed Positive Linear Regulators

  • LM7805: 5V, 1A output
  • LM7812: 12V, 1A output
  • LM7815: 15V, 1A output
  • Package: TO-220, TO-92
  • Features: Simple 3-terminal design, thermal shutdown, short circuit protection
  • Applications: Digital circuits, microcontroller power, general purpose

LM79xx Series - Fixed Negative Linear Regulators

  • LM7905: -5V, 1A output
  • LM7912: -12V, 1A output
  • LM7915: -15V, 1A output
  • Package: TO-220, TO-92
  • Features: Negative voltage generation, dual supply systems
  • Applications: Op-amp supplies, analog circuits, bipolar supplies

LM317 - Adjustable Positive Linear Regulator

  • Output Range: 1.25V to 37V
  • Current: Up to 1.5A
  • Package: TO-220, TO-92, SOIC
  • Features: Excellent line/load regulation, thermal protection
  • Applications: Variable power supplies, battery chargers, precision references

LM2596 - Switching Step-Down Regulator

  • Input Range: 4.5V to 40V
  • Output: Adjustable 1.23V to 37V
  • Current: Up to 3A
  • Efficiency: Up to 92%
  • Features: 150kHz switching frequency, thermal shutdown
  • Applications: Efficient power conversion, battery-powered systems

STMicroelectronics Regulators

L78xx Series - Fixed Positive Linear Regulators

  • L7805: 5V, 1.5A output
  • L7812: 12V, 1.5A output
  • L7815: 15V, 1.5A output
  • Package: TO-220, TO-220FP, DPAK
  • Features: Higher current capability than LM78xx, thermal protection
  • Applications: Power supplies, automotive, industrial

L79xx Series - Fixed Negative Linear Regulators

  • L7905: -5V, 1.5A output
  • L7912: -12V, 1.5A output
  • L7915: -15V, 1.5A output
  • Package: TO-220, TO-220FP
  • Features: Negative voltage regulation, robust design
  • Applications: Dual supply systems, analog circuits

LD1117 Series - Low Dropout Linear Regulators

  • LD1117V33: 3.3V, 800mA output
  • LD1117V50: 5V, 800mA output
  • LD1117: Adjustable 1.25V to 13.8V
  • Dropout: 1.2V typical
  • Package: SOT-223, TO-220, SOIC
  • Features: Low dropout voltage, current limiting, thermal shutdown
  • Applications: Battery-powered devices, 3.3V systems, microcontroller supplies

L200 - Adjustable Switching Regulator

  • Output Range: 2.85V to 36V
  • Current: Up to 2A
  • Input Range: Up to 40V
  • Features: Current and voltage regulation, protection circuits
  • Applications: Variable power supplies, battery chargers

Technical Specifications

Linear Regulators

  • Regulation: Excellent line and load regulation
  • Noise: Low output noise
  • Response: Fast transient response
  • Efficiency: 30-60% typical
  • Heat Generation: Significant at high current
  • Dropout: 2-3V typical (1.2V for LDO)

Switching Regulators

  • Efficiency: 80-95% typical
  • Switching Frequency: 50kHz to 2MHz
  • Ripple: Higher output ripple
  • Complexity: Requires external components
  • EMI: Potential electromagnetic interference
  • Cost: Higher component cost

Package Types and Thermal Considerations

TO-220 Package

  • Power Dissipation: Up to 15W with heat sink
  • Thermal Resistance: 5°C/W to heat sink
  • Mounting: Bolt-on heat sink mounting
  • Applications: Medium to high power applications

TO-92 Package

  • Power Dissipation: Up to 1W in free air
  • Thermal Resistance: 200°C/W junction to ambient
  • Mounting: Through-hole, no heat sink
  • Applications: Low power applications

SOT-223/DPAK Package

  • Power Dissipation: Up to 2W with PCB heat spreading
  • Thermal Resistance: 50-100°C/W junction to ambient
  • Mounting: Surface mount with thermal pad
  • Applications: SMD designs, moderate power

Applications

Power Supply Design

  • Linear Supplies: Low noise, simple design
  • Switching Supplies: High efficiency, compact
  • Dual Supplies: Positive and negative voltages
  • Variable Supplies: Adjustable output voltage
  • Battery Chargers: Constant voltage/current

Circuit Applications

  • Microcontroller Power: 3.3V and 5V supplies
  • Analog Circuits: Low noise power for op-amps
  • Digital Logic: TTL and CMOS power supplies
  • Sensor Interfaces: Precision reference voltages
  • LED Drivers: Constant current/voltage

System Integration

  • Voltage Translation: Level shifting between domains
  • Power Sequencing: Controlled startup/shutdown
  • Protection: Overcurrent and thermal protection
  • Filtering: Power supply noise reduction
  • Isolation: Galvanic isolation in switching designs

Design Considerations

Linear Regulator Design

  • Heat Dissipation: (Vin - Vout) × Iout = Power loss
  • Heat Sinking: Thermal management for TO-220
  • Input/Output Capacitors: Stability and noise reduction
  • Load Regulation: Maintain voltage under varying loads
  • Line Regulation: Maintain voltage with input variations

Switching Regulator Design

  • Inductor Selection: Current rating and saturation
  • Capacitor Selection: ESR and ripple current
  • Feedback Network: Output voltage setting
  • Layout Considerations: Minimize switching noise
  • EMI Filtering: Input and output filtering

Protection Features

  • Thermal Shutdown: Overtemperature protection
  • Current Limiting: Overcurrent protection
  • Short Circuit Protection: Output short protection
  • Reverse Polarity: Input protection
  • Overvoltage: Input overvoltage protection

Testing and Characterization

Basic Testing

  • Output Voltage: Verify regulation accuracy
  • Load Regulation: Voltage vs. current
  • Line Regulation: Voltage vs. input voltage
  • Efficiency: Output power / input power
  • Thermal Performance: Temperature rise

Advanced Testing

  • Transient Response: Load step response
  • Noise Measurement: Output ripple and noise
  • Stability Analysis: Loop gain and phase
  • EMI Testing: Conducted and radiated emissions
  • Reliability Testing: Long-term operation

Common Circuit Configurations

Basic Linear Regulator

Vin ---[Input Cap]--- Regulator ---[Output Cap]--- Vout
                          |
                         GND

Adjustable Regulator (LM317)

Vin --- LM317 --- Vout
         |    |
        R1   R2
         |    |
        GND  GND
Vout = 1.25V × (1 + R2/R1)

Switching Regulator (LM2596)

Vin ---[L]--- Vout
   |      |      |
  LM2596  D   [C_out]
   |           |
  [C_in]      GND
   |
  GND

Advantages and Limitations

Linear Regulators

Advantages:

  • Simple design and implementation
  • Low output noise and ripple
  • Fast transient response
  • No EMI generation
  • Low cost

Limitations:

  • Low efficiency (heat generation)
  • Limited input-output voltage difference
  • Not suitable for high power applications
  • Requires heat sinking for high current

Switching Regulators

Advantages:

  • High efficiency (low heat)
  • Wide input voltage range
  • Suitable for high power applications
  • Compact size for given power

Limitations:

  • Complex design requirements
  • Higher output ripple and noise
  • Potential EMI issues
  • Higher component cost
  • Slower transient response

Tags

voltage-regulator, lm7805, lm317, l7805, ld1117, lm2596, power-supply, linear, switching

Notes

This voltage regulator collection provides essential components for power supply design across a wide range of applications. The combination of linear and switching regulators from Texas Instruments and STMicroelectronics offers flexibility in choosing the optimal solution for specific requirements. Linear regulators excel in low-noise applications, while switching regulators provide high efficiency for power-sensitive designs. Proper thermal management and circuit design are crucial for reliable operation.

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