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BUY LT1121IST-5 https://www.utsource.net/itm/p/1113871.html
Octal Buffers/Drivers With 3-State Outputs 20-SO 0 to 70
| Parameter | Min | Typical | Max | Unit | Description |
|---|---|---|---|---|---|
| Input Voltage | 2.5 | - | 40 | V | Operating range |
| Output Voltage | - | 5 | - | V | Fixed output voltage |
| Output Current | - | 150 | - | mA | Maximum continuous output current |
| Quiescent Current | - | 7 | - | mA | Supply current at no load |
| Dropout Voltage | - | 0.8 | - | V | Voltage difference between VIN and VOUT |
| PSRR (Power Supply Rejection Ratio) | - | 80 | - | dB @ 1kHz | Ability to reject input ripple |
| Load Regulation | - | 0.01 | - | % | Change in output voltage with varying load |
| Line Regulation | - | 0.01 | - | %/V | Change in output voltage with varying input |
| Operating Temperature | -40 | - | 125 | 掳C | Ambient temperature range |
Instructions for LT1121IST-5:
Input Voltage Selection: Ensure the input voltage is within the specified operating range of 2.5V to 40V. The regulator is designed to maintain a stable 5V output within this range.
Output Capacitor: Use a minimum of 1渭F ceramic capacitor on the output for stability. Higher values can be used for better transient response.
Input Capacitor: Place a 0.1渭F ceramic capacitor close to the input pin to minimize noise and transients from the power supply.
Heat Dissipation: If operating near the maximum output current, consider using a heatsink or ensuring adequate airflow to prevent overheating.
PCB Layout: Keep the layout compact with short traces, especially for the ground connections, to reduce noise and improve performance.
Load Regulation: For optimal performance, ensure that the load does not exceed the maximum output current limit of 150mA.
Temperature Considerations: Operate within the recommended temperature range (-40掳C to 125掳C) to avoid thermal shutdown and ensure reliable operation.
Capacitor Selection: Choose capacitors with low ESR (Equivalent Series Resistance) for better performance and stability.
Power Supply Ripple Rejection: The high PSRR ensures minimal impact from input voltage variations, making it suitable for noisy environments.
Dropout Voltage: Be aware of the dropout voltage when designing your circuit to ensure the input voltage is sufficiently higher than the output voltage to maintain regulation.
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