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Specifications
SKU: 1113079
Voltage-Mode SMPS Controller
| Parameter | Symbol | Min | Typ | Max | Unit | Notes |
|---|---|---|---|---|---|---|
| Input Voltage | VIN | 3.0 | - | 42 | V | |
| Output Voltage Range | VOUT | 0.8 | - | 35 | V | Adjustable |
| Output Current | IOUT | - | - | 6 | A | Continuous |
| Switching Frequency | fSW | - | 1.5 | - | MHz | Fixed |
| Quiescent Current | IQ | - | 1.4 | - | mA | No load |
| Efficiency | η | - | 97 | - | % | At 5V in, 3.3V out, 3A load |
| Dropout Voltage | VDROPOUT | - | 0.6 | - | V | At 3A load |
| Load Regulation | ΔVOUT/ΔILOAD | - | 0.1 | - | % | From 0 to 3A |
| Line Regulation | ΔVOUT/ΔVIN | - | 0.05 | - | %/V | From 5V to 12V |
| Thermal Shutdown | TSD | - | 160 | - | °C | |
| Protection | OVP, SCP, OTP | - | - | - | - | Overvoltage, short-circuit, thermal |
Instructions for Using the LM2636MTC
Circuit Design:
- Ensure the input voltage (VIN) is within the specified range (3.0V to 42V).
- Use appropriate external components such as inductors, capacitors, and resistors to set the output voltage and filter the output.
Output Voltage Setting:
- The output voltage (VOUT) can be adjusted using a resistor divider network connected to the feedback (FB) pin.
- Calculate the resistor values using the formula: ( V_ = V_ left(1 + fracright) ), where ( V_ ) is typically 0.8V.
Inductor Selection:
- Choose an inductor with a saturation current rating higher than the maximum output current (6A).
- The inductor value should be selected based on the desired ripple current and switching frequency.
Capacitor Selection:
- Use input and output capacitors to stabilize the circuit and reduce ripple.
- Recommended values for input capacitors: 10μF to 47μF ceramic or tantalum.
- Recommended values for output capacitors: 10μF to 100μF ceramic or low ESR electrolytic.
Thermal Management:
- Ensure adequate heat dissipation by mounting the IC on a heatsink or PCB with sufficient copper area.
- Monitor the junction temperature to avoid exceeding the thermal shutdown threshold (160°C).
Protection Features:
- The LM2636MTC includes overvoltage protection (OVP), short-circuit protection (SCP), and overtemperature protection (OTP).
- These features will automatically shut down the device if any of these conditions are detected, protecting the circuit from damage.
Layout Considerations:
- Place the input and output capacitors as close as possible to the IC to minimize parasitic inductance.
- Keep the ground connections short and wide to reduce resistance and inductance.
Testing and Debugging:
- Before finalizing the design, test the circuit under various load conditions to ensure stable operation.
- Use an oscilloscope to monitor the output voltage and current ripple.
By following these guidelines, you can effectively design and implement a power supply using the LM2636MTC.
(For reference only)Inquiry - LM2636MTC
