Texas Instruments provides a recommended PCB layout in the LP87332 datasheet, which includes guidelines for thermal vias, copper pours, and component placement. Additionally, the TI Power Management Layout Guidelines application note (SLUA444) provides more detailed information on PCB layout best practices for power management devices.
To optimize output voltage accuracy and stability, ensure that the input voltage is within the recommended range, and the output capacitor is selected according to the datasheet recommendations. Additionally, consider using a low-ESR output capacitor and minimizing the PCB trace resistance between the output capacitor and the load. The LP87332 also has an adjustable output voltage feature, which can be used to fine-tune the output voltage.
The LP87332 has an absolute maximum input voltage rating of 6.5V. However, the recommended operating input voltage range is 2.7V to 5.5V. Applying an input voltage above 5.5V may reduce the device's reliability and lifespan.
To ensure the LP87332 is in a low-power state during shutdown, ensure that the EN pin is driven low, and the input voltage is removed or reduced to a level below the undervoltage lockout (UVLO) threshold. Additionally, consider using an external power switch or load switch to disconnect the load from the output during shutdown.
The recommended input capacitor value and type depend on the input voltage and current requirements. As a general guideline, a 10uF to 22uF ceramic capacitor with an X5R or X7R dielectric is recommended. The input capacitor should be placed as close as possible to the VIN pin and should have a low equivalent series resistance (ESR) to minimize input voltage ripple.
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About Texas Instruments
Texas Instruments (TI) designs and manufactures semiconductors and integrated circuits for a wide range of applications. The company's product portfolio includes analog chips, which are essential for managing power and signal functions in electronic devices, and embedded processors, which serve as the brains in various systems, enabling functionality in everything from industrial equipment to consumer electronics. TI's innovations in semiconductor technology have made it a leader in the industry.
