ISL6845IUZ-T

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ISL6845IUZ-T application field and working principle

• Introduction

  The ISL6845IUZ-T is a highly integrated 28V, synchronous, step-down DC/DC controller for automotive powertrain applications. It features an input voltage range of 2V to 28V, programmable switching frequency from 200kHz to 2MHz, adjustable output current limit, and adjustable output voltage. It also has an on-board look-up table, a 5-bit DAC, and a programmable slew rate delay that helps reduce power dissipation during load transients. The ISL6845IUZ-T is ideal for automotive powertrain applications such as battery management, turbo charging, transmission, and air conditioning.

  It is an advanced buck switching controller that drives two external N-channel power MOSFETs for implementing high ambient temperature withstand voltage and current buck regulators. This technology enables high-efficiency operation when high switching frequencies are used. Additionally, the ISL6845IUZ-T features a low quiescent current, low operating voltage, and an internal temperature sensor.

• Application fields

  The versatility of the ISL6845IUZ-T makes it suitable for various applications. It can be used in automotive powertrains such as battery management, turbo charging, air conditioning and transmission as well as portable battery-powered equipment.

  The controller can be used in other applications, such as in distributed power systems, providing power to critical equipment. It is particularly useful in automotive applications that require highly regulated DC to DC conversion but have limited space, such as in air conditioning, powertrain control modules, engine controllers, power train junction boxes, and alternator systems.

• Working principle

  The working principle of the ISL6845IUZ-T is based on a synchronous buck topology. This requires two external N-channel MOSFETs, one for the high side and one for the low side of the power converter. The ISL6845IUZ-T integrates the control logic for both switches in the device and provides programming options to adjust the switching frequency, output current limit, and output voltage.

  When the device is enabled, the low side MOSFET is turned on and the high side MOSFET is held off. The voltage present on the output side is regulated by adjusting the duty cycle of the low side switch. The duty cycle is determined by the output voltage desired and the current in the inductor.

  The ISL6845IUZ-T also has an internal temperature sensor that adjusts the duty cycle depending on the temperature of the device. This allows for a better control of the output voltage, and increases efficiency at high temperature operation.

• Conclusion

  The ISL6845IUZ-T is a highly integrated 28V, synchronous, step-down DC/DC controller for automotive powertrain applications. It features an input voltage range of 2V to 28V, programmable switching frequency from 200kHz to 2MHz, adjustable output current limit, and adjustable output voltage. It also has an on-board look-up table, a 5-bit DAC, and a programmable slew rate delay that helps reduce power dissipation during load transients. The controller is suitable for various applications, such as automotive powertrains, distributed power systems, portable battery-powered equipment, and more.

  The working principle of the ISL6845IUZ-T is based on a synchronous buck topology. It integrates the control logic for both switches and provides programming options to adjust the switching frequency, output current limit, and output voltage. An internal temperature sensor is also included that adjusts the duty cycle depending on the temperature of the device. This allows for a better control of the output voltage and increases efficiency at high temperature operation.

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