Description:The ISL6146 represents a family of OR-ing MOSFET controllers capable of OR-ing voltages from 1V to 18V. Together with suitably sized N-channel power MOSFETs, the ISL6146 increases power distribution efficiency when replacing a power OR-ing diode in high current applications. It provides gate drive voltage for the MOSFET(s) with a fully integrated charge pump. The ISL6146 allows users to adjust with external resistor(s) the VOUT - VIN trip point, which adjusts the control sensitivity to system power supply n
A good PCB layout for the ISL6146BFRZ-TK involves keeping the input and output capacitors close to the device, using short and wide traces for the power lines, and separating the analog and digital grounds. A 4-layer PCB with a solid ground plane is recommended. Renesas provides a recommended PCB layout in the application note AN1995.
To ensure stability and prevent oscillations, it's essential to follow the recommended component values and PCB layout. Additionally, the output capacitor should be selected based on the output voltage and current requirements. A minimum of 10uF output capacitance is recommended, and the ESR (Equivalent Series Resistance) should be less than 1 ohm. The datasheet provides a detailed stability analysis and component selection guide.
The maximum input voltage that can be applied to the ISL6146BFRZ-TK is 28V. However, it's recommended to operate the device within the specified input voltage range of 7V to 24V for optimal performance and reliability.
The VID pins on the ISL6146BFRZ-TK can be used to program the output voltage. The output voltage can be set to one of 32 possible values between 0.7V and 1.5V by connecting the VID pins to VCC, GND, or leaving them open. The datasheet provides a detailed VID code table and programming guide.
The thermal derating curve for the ISL6146BFRZ-TK is provided in the datasheet. The device can operate up to a junction temperature of 125°C, but the output current should be derated above 85°C to prevent overheating. The derating curve provides the maximum output current vs. junction temperature.
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ISL6146BFRZ-TK Overview
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