Description:Voltage Detector with Fixed Delay Time: ROHM's BD45xxxG and BD46xxxG series of reset ICs utilize CMOS processes for low current consumption and high accuracy. The built-in counter timer delay circuit eliminates the need to set the delay time via external capacitor. The extensive lineup includes both Nch Open Drain and CMOS output types in a wide range of detection voltages (from 2.3V to 4.8V, in 0.1V steps), enabling selection of the ideal solution based on customer requirements. A total of 156 models are o
ROHM recommends a thermal pad on the bottom of the package, connected to a large copper area on the PCB to dissipate heat efficiently. A minimum of 2oz copper thickness is recommended, and the thermal pad should be connected to a ground plane to reduce thermal resistance.
To ensure stable operation with a high-capacitance output capacitor, ROHM recommends adding a 1-10nF ceramic capacitor in parallel with the output capacitor to reduce the risk of oscillation. Additionally, the output capacitor should be placed close to the IC to minimize parasitic inductance.
The maximum allowed voltage on the EN (enable) pin is 6V, which is higher than the recommended operating voltage of 5V. However, it's essential to ensure that the EN pin voltage does not exceed the IC's supply voltage (VIN) to prevent damage.
While the BD45231G-TR is rated for operation up to 105°C, ROHM recommends derating the output current and power dissipation at high temperatures to ensure reliable operation. Consult the datasheet and ROHM's application notes for specific guidelines.
To troubleshoot oscillation or instability issues, check the PCB layout for parasitic inductance, ensure proper decoupling capacitors are used, and verify that the output capacitor is suitable for the application. Also, check the input voltage ripple and ensure it's within the recommended specifications.
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