ISL6610ACBZ-T

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PMIC - Gate Drivers represent a class of integrated circuits (ICs) that enable the control of large currents in power semiconductor devices. The ISL6610ACBZ-T is a three-channel, high-side and low-side, N-channel MOSFET driver IC that is suitable for a variety of power systems including Load Switch, DC-DC Power Conversion, Regulated Power Supplies, and Motor Control.

Application Field

The ISL6610ACBZ-T is specifically designed to control higher efficiency, high-frequency, synchronous step-down dc-dc converters requiring lower RDS(on) of the power MOSFETs. The device extends battery life by offering improved efficiency and higher operating frequency for the system compared to standard PWM, as well as more accurate current and power control. Moreover, the ISL6610ACBZ-T performs instantaneous current sensing and zero-crossing detection, ensuring better control of the total switching loss.

Working Principle

The ISL6610ACBZ-T combines three high-side and three low-side N-channel MOSFET drivers, with a tightly regulated operating voltage, operating current limiter, and under-voltage lockout, perfectly suited for use in a wide variety of high-current switching applications.

The control logic consists of a power stage control block and an enable block. The power stage control block contains a logic control circuit to detect the output signals from the PWM block and control switch states on the top and bottom FETs. This logic control circuit is designed to switch at zero current and provide current-sense output for load current monitoring.

The enable block provides enable signals for both high-side and low-side MOSFETs. This enable block also has an under-voltage lockout (UVLO) function which prevents the MOSFETs from turning ON until the VCC supply voltage is above the device’s threshold voltage. This feature is necessary when the system supply voltage fluctuates and could otherwise damage the MOSFETs by allowing them to be driven with insufficient supply voltage.

The ISL6610ACBZ-T has an operating current limiter which allows the device to operate with an extended temperature range. The device’s current-limiting feature improves the average operating temperature of the IC and prevents overcurrent conditions that could lead to permanent damage of the device.

The MOSFET drivers of the ISL6610ACBZ-T operate in two modes: high impedance mode and high current mode. The high impedance mode allows the device to operate at lower frequencies (up to 25kHz), while the high current mode can support higher frequencies (up to 1MHz). The device’s high impedance mode is suitable for applications with low gate capacitance, while the high-current mode provides faster gate switching response for higher gate capacitance applications.

In addition to the three power MOSFET drivers, the ISL6610ACBZ-T also has a regular logic-level on-off control input, which can be used to enable or disable the power stage. The device also includes an open-source output, which can be used to regulate system-level protection or other peripherals.

In summary, the ISL6610ACBZ-T is an ideal device for high power, high-efficiency applications. The device’s integrated logic control and current-limiting features ensure the highest efficiency and power management in the event of a fault. The device’s optimized high-side/low-side MOSFET driver structure and its high operating frequency allow for greater accuracy and faster switching transients.

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