ROHM recommends a PCB layout with a thermal pad connected to a large copper area on the bottom layer, and multiple vias to dissipate heat efficiently. A minimum of 2oz copper thickness is recommended.
To ensure stable operation with a high-ESR capacitor, ROHM recommends adding a 1nF to 10nF ceramic capacitor in parallel with the output capacitor to reduce the equivalent series resistance (ESR).
The maximum allowed voltage on the EN pin is 6V, exceeding which may cause damage to the device. It is recommended to use a voltage limiter or a resistor divider to ensure the voltage remains within the specified range.
While the DA228UMTL is rated for operation up to 105°C, ROHM recommends derating the output current and voltage to ensure reliable operation in high-temperature environments. Consult the datasheet for derating guidelines.
To troubleshoot oscillations or instability issues, ROHM recommends checking the PCB layout for noise coupling, ensuring proper decoupling capacitors, and verifying the output capacitor's ESR and capacitance values. Additionally, check for any voltage drops or noise on the input and output lines.
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