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Specifications
SKU: 11190571
IC LED DRVR RGLTR DIM 1.8A SC70
| Parameter | Symbol | Min | Typical | Max | Unit | Conditions |
|---|---|---|---|---|---|---|
| Input Voltage | VIN | 1.8 | - | 5.5 | V | |
| Output Voltage | VOUT | - | 3.3 | - | V | Fixed output voltage |
| Output Current | IOUT | - | 500 | - | mA | Continuous |
| Efficiency | η | - | 92 | - | % | At 3.3V output, 300mA load |
| Switching Frequency | fSW | - | 2.2 | - | MHz | |
| Quiescent Current | IQ | - | 27 | - | μA | No load, VIN = 3.3V |
| Shutdown Current | ISD | - | 0.1 | - | μA | VIN = 3.3V, SHDN = 0V |
| Start-Up Time | tSTART | - | 1.2 | - | ms | VIN = 3.3V, VOUT = 3.3V |
| Thermal Shutdown Threshold | TSD | - | 160 | - | °C | |
| Operating Temperature Range | TOPR | -40 | - | 125 | °C | |
| Storage Temperature Range | TSTG | -65 | - | 150 | °C |
Instructions for Using TPS61169DCKR
Input Voltage (VIN):
- Ensure the input voltage is within the range of 1.8V to 5.5V.
- Use appropriate input capacitors (typically 1μF ceramic) to stabilize the input voltage.
Output Voltage (VOUT):
- The TPS61169DCKR has a fixed output voltage of 3.3V. No external resistors are required to set the output voltage.
Output Capacitor:
- Use a 10μF ceramic capacitor on the output to ensure stable operation and minimize ripple.
Inductor Selection:
- Choose an inductor with a value between 1.0μH and 2.2μH. A typical value is 1.5μH.
- Ensure the inductor can handle the maximum current (IOUT) without saturating.
Shutdown Pin (SHDN):
- To enable the device, connect the SHDN pin to VIN or leave it floating.
- To disable the device, pull the SHDN pin to GND. This will reduce the quiescent current to approximately 0.1μA.
Thermal Management:
- Ensure adequate heat dissipation by using a PCB with sufficient copper area or a heatsink if necessary.
- Monitor the thermal shutdown threshold (160°C) to prevent damage from overheating.
PCB Layout:
- Place the input and output capacitors as close as possible to the respective pins to minimize parasitic inductance.
- Use wide traces for power paths to reduce resistance and voltage drops.
Start-Up and Transient Response:
- The start-up time is typically 1.2ms. Ensure that the system can handle this delay.
- The device has good transient response, but adding additional capacitance can help with large load changes.
Storage and Handling:
- Store the device in a dry environment within the temperature range of -65°C to 150°C.
- Handle the device with care to avoid static discharge, which can damage sensitive components.
Testing and Troubleshooting:
- Verify the input and output voltages with a multimeter.
- Check for proper inductor and capacitor values and connections.
- If the device does not start up, check the SHDN pin and ensure it is properly connected.
Inquiry - TPS61169DCKR
