ISL8016IR33Z

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The ISL8016IR33Z is a current-mode, step-down synchronous DC-DC converter featuring integrated power enhancements and protection. Using an internal synchronous rectifier, the device operates at switching frequencies up to 2.2MHz, allowing the use of small external components. It also incorporates an internal voltage reference with an accuracy of ±0.75% for reliable and easy-to-use applications. The ISL8016IR33Z operates from 4.5V to 20V inputs, and provides a regulated output from 0.6V to VIN, up to 7A with external components. The device provides a low ripple Pulse Frequency Modulation (PFM) for light loads, and the exceptional load and line regulation performance over a wide range of applications. Additionally, the power-saving features of the device, such as Burst Mode operation and Pulse Width Modulation (PWM) Sync mode, help extend battery life in portable applications.

The ISL8016IR33Z is an ideal choice for a wide range of applications. It’s suitable for converting Point of Load (POL) systems that have a wide input voltage range, as well as requiring ultra-high efficiency and fast transient response. When used in conjunction with a low-cost PIC MCU, the ISL8016IR33Z provides a cost effective solution for LED drive applications, as it can supply constant current for up to 8 strings of LED for up to 150mA. It provides a feature known as external EEPROM-controlled mode, which allows the system to adjust the LED current of each string concurrently.

The working principle of the ISL8016IR33Z is based on its synchronous rectifier and current-mode control. It will switch between two different operating modes, PWM Sync and Burst Mode, depending on the load requirements. In PWM Sync mode the device provides fast transient response and the highest efficiency. In Burst Mode the device provides excellent power savings by reducing the switching frequency at light load to decrease power losses.

In PWM Sync mode, the ISL8016IR33Z will regulate output voltage by sensing current on the RSens pin. It will modulate switching frequency and duty to maintain a regulated output voltage. The input voltage will is detected by the PFair pin, allowing the device to spread the current during the PWM sync mode. In Burst mode the device enters low power idle state and operates with low switching frequency. When the load increases the device transitions back to PWM Sync mode so that the output voltage regulation is maintained.

The ISL8016IR33Z can protect itself and its load from various possible conditions. For example, it provides Over-Voltage Protection, self-protection from overtemperature and overcurrent/short-circuit protection. An internal power-on reset (POR) keeps the output in the default safe state during power-up. Its EMI filter reduces conducted emissions for low noise levels.

In conclusion, the ISL80016IR33Z is a synchronous step-down DC-DC converter designed for a wide range of applications, such as Point of Load (POL) systems, LED driver applications and portable devices. Its integrated features and protection helps to simplify the design process and reduce system cost. It has an internal voltage reference with an accuracy of ±0.75%, and protects itself and its load with several features such as power-on reset, over-voltage protection, over- temperature protection, overcurrent/short-circuit protection, and an EMI filter. The switching frequency of up to 2.2MHz allows the use of tiny external components, allowing for an efficient and cost effective solution.

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