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
A good PCB layout for the BD45272G-TR involves keeping the input and output traces separate, using a solid ground plane, and placing decoupling capacitors close to the IC. Additionally, it's recommended to use a shielded inductor and to keep the switching node (SW) away from sensitive analog circuits.
When selecting an inductor for the BD45272G-TR, consider the inductor's saturation current, DC resistance, and core material. A good starting point is to choose an inductor with a saturation current rating above the peak current of the converter, and a DC resistance that minimizes power loss. ROHM recommends using a shielded inductor with a ferrite or iron powder core.
The BD45272G-TR is rated for operation in ambient temperatures ranging from -40°C to 105°C. However, the device's performance and reliability may degrade at extreme temperatures. It's essential to ensure proper thermal design and heat dissipation to maintain the device's junction temperature within the recommended range.
The BD45272G-TR has a built-in overcurrent protection (OCP) feature that can be enabled by connecting the OCP pin to a resistor divider network. The OCP threshold can be set by adjusting the resistor values. Additionally, an external current sense resistor can be used to monitor the output current and trigger the OCP circuit.
ROHM recommends using a ceramic capacitor with a value between 4.7uF to 10uF for the input capacitor. The capacitor should have a voltage rating that exceeds the maximum input voltage, and an ESR that minimizes power loss. X5R or X7R dielectric capacitors are suitable for this application.
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