UC3708NG4

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Power management integrated circuits (PMICs) are primarily used in the power supply and control circuitry of electronic systems for hierarchically controlling and regulating the energy of electrical and electronic systems. PMICs are broadly classified into voltage regulators and specific power ICs, such as battery, motor and supercapacitor drivers, all of which are essential in various automotive, industrial, communication and consumer applications.

Gate drivers are specialized power ICs used for regulating logic level signals in Switch Mode Power Supply (SMPS) applications. These ASICs are responsible for generating isolated and isolated pulses to control the Switched Mode Power Supply (SMPS) switches. Gate drivers effectively aid in increasing the reliability and accuracy of SMPS operations by modulating the turn-on and turn-off times of its switches. The UC3708NG4 is a non-isolated gate driver power management IC (PMIC) developed by ON Semiconductor. This device is used driving high power switches such as MOSFETs, IGBTs and BJTs.

Features:

• Wide power supply range (7V - 30V)
• Ease of use − low side drive switch
• Protections against short circuits, gate to source over-voltage, overcurrent and undervoltage
• Dedicated current limit adjustment
• Drives up to 5A

UC3708NG4 Application Field

The UC3708NG4 is a gate driver integrated circuit used in a range of power supplies, such as DC/DC converters, AC/DC converters, motor drives, load switch drives and AC motor controllers in both industrial and RF applications. This device has also been utilized in applications with high efficiency, such as solar inverters, storage systems, on board chargers and battery charger power supplies.

UC3708NG4 Working Principle

The UC3708NG4 is a universal gate driver for MOSFET, IGBT, and bipolar junction transistors (BJT) applications. It is mainly used for driving power supplies and DC/DC converters. It employs a self-biased topology to switch between high and low modes, after which its main power stage immediately starts working.

The MOSFET driver of UC3708NG4 features an integrated power supply range of 7V to 30V, and it can drive up to 5A. Its under-voltage and over-voltage protection helps protect the switching elements from damaging occurrences. Its low current (19 mA) and low voltage (2.2 V) turn on and turn off features guarantee that drivers operate at high efficiency, while a dedicated current limit adjustment helps to optimize the operating parameters of the switching element. In addition, the driver features a protective circuit that senses output current, reduces high drive currents and switches off during overload, decreasing the heat generated at the device output.

The UC3708NG4 also includes a protective circuit to detect short circuits, over-current and under-voltage. In the event of an over-voltage, the driver switches off and it is re-activated once the voltage drops to a safe level. In the case of over-current, the driver adjusts the gate charge to reduce gate current, switching off the output during an overload. Under-voltage protection ensures that the device does not operate during low voltage, preventing possible damage and increasing device longevity.

The UC3708NG4 also features an additional Pull-Down function, which reduces the drive voltage to the switching element. This effectively helps to reduce static power supply to the system and reduces turn-off delays.

In summary, the UC3708NG4 is a reliable non-isolated gate driver power management IC (PMIC) used in a range of power supplies, such as DC/DC converters, AC/DC converters, motor drives, load switch drives, and AC motor controllers. It features a wide power supply range, protections against short circuits, overvoltage, overcurrent and undervoltage, easy of use, drive up to 5A, and dedicated current limit adjustment.

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