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A good PCB layout is crucial for the LTC2057's performance. It's recommended to keep the input and output traces short and separate, use a solid ground plane, and place the bypass capacitors close to the device. A 4-layer board with a dedicated ground plane is recommended. Refer to the Linear Technology application note AN137 for more details.
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The input capacitor should be a low-ESR ceramic capacitor with a value between 1uF to 10uF. The output capacitor should be a low-ESR ceramic or tantalum capacitor with a value between 1uF to 22uF. The capacitor values and types will affect the stability and transient response of the regulator. Refer to the datasheet and application notes for more guidance.
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The maximum input voltage rating for the LTC2057 is 15V, but it's recommended to keep the input voltage below 12V to ensure reliable operation and to prevent damage to the internal circuitry.
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To ensure stability, make sure to follow the recommended PCB layout, choose the right input and output capacitors, and keep the input and output traces short and separate. Also, ensure that the output capacitor has a low ESR and is placed close to the device. If oscillations occur, try adding a small ceramic capacitor (10nF to 100nF) between the output and ground pins.
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The LTC2057 has a thermal derating of 30mW/°C above 25°C. This means that the maximum power dissipation will decrease as the ambient temperature increases. Make sure to consider this when designing the thermal management for the device.
LTC2057HVIDD#TRPBF datasheet
by Linear Technology
