Description:The ISL91127 and ISL91127IR are high-current buck-boost switching regulators for systems using new battery chemistries. They use Renesas' proprietary buck-boost algorithm to maintain voltage regulation while providing excellent efficiency and very low output voltage ripple when the input voltage is close to the output voltage.They are capable of delivering at least 2A continuous output current (VOUT = 3.3V) over a battery voltage range of 2.5V to 4.35V. This maximizes the energy utilization of advanced sing
A good PCB layout for the ISL91127IRAZ-T7A involves keeping the input and output capacitors close to the device, using a solid ground plane, and minimizing the length of the traces between the device and the capacitors. Additionally, it's recommended to use a 4-layer PCB with a dedicated power plane and a dedicated ground plane.
To ensure the stability of the output voltage, it's essential to choose the correct output capacitor value and type. A minimum capacitance of 10uF is recommended, and the capacitor should have a low ESR (Equivalent Series Resistance) to minimize voltage ripple. Additionally, the output voltage can be stabilized by adding a small ceramic capacitor (e.g., 100nF) in parallel with the output capacitor.
The ISL91127IRAZ-T7A can handle a maximum input voltage of 5.5V. Exceeding this voltage may damage the device. It's essential to ensure that the input voltage is within the recommended range to ensure reliable operation.
The ISL91127IRAZ-T7A has a fixed output voltage, but it can be adjusted using an external resistor divider network. The output voltage can be calculated using the formula: VOUT = 0.8V x (R1 / R2 + 1), where R1 and R2 are the resistors in the divider network.
The ISL91127IRAZ-T7A has a thermal derating of 6.4mW/°C above 25°C. This means that the device's power dissipation should be reduced as the ambient temperature increases to prevent overheating.
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ISL91127IRAZ-T7A Overview
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