ISL97519IUZ-T

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ISL97519IUZ-T Application Field and Working Principle

The ISL97519IUZ-T is a PQFN form factor, integrated circuit (IC) belonging to the PMIC (power management integrated circuits) family of data signal controllers, developed by Intersil Corporation. ISL97519IUZ-T is a DC-DC switching regulator voltage regulator, acting as a voltage source used to transfer fixed or adjustable DC voltage from one point to another. Thus, the device can maintain a constant voltage under varying load conditions, thereby regulating the output voltage of the source.

The ISL97519IUZ-T provides a flexible design for applications like embedded systems, baseband, broadband, industrial control and mission-critical systems. Furthermore, the low quiescent current and wide input voltage range makes it suitable for low power operations, including battery-powered systems. This regulator offers several protection features, such as input under-voltage (UV) protection, output current limit protection, thermal protection and adjustable output voltage.

The device operates in an adjustable switching frequency range of either 1.25MHz or 2.5MHz and supports different output voltage settings, down to 0.8V. It is available in a 16-PQFN, 1.6×1.6mm package and has maximum current limit protection at 6A, making it ideal for applications which require both high switching performance and extremely low, Rds(on) FETs.

Working Principle of the ISL97519IUZ-T

The ISL97519IUZ-T is a DC-DC buck converter with a 3-phase interleaved controller, capable of providing an excellent current and voltage regulation performance, over a wide input-voltage range. The device consists of three main components, namely a control IC, P-channel MOSFETs, a switching inductor and passive elements. On power-up, the control IC initiates a start-up circuit which provides a duty cycle pulse to the gate of the P-channel MOSFETs. This charges the inductor with a specified amount of current, thus allowing the conduction of current.

In the continuous conduction mode (CCM) of operations, the output voltage depends on the duty cycle of the gate signal and is maintained at the specified output voltage, by the voltage error amplifier. The signal is then amplified and compared to the voltage reference, generating a control voltage. This signal is used by the control logic to adjust the duty cycle of the gate signal. This signal oscillates between high and low values, resulting in a sinusoidal waveform from the gate’s source terminal.

A low-pass filter is then used to filter these high and low signals. The resultant voltage is the regulated output voltage. The device also provides an adjustable output voltage between 0.8V and 1.2V. This functionality is achieved by changing the voltage reference and input voltage, by connecting a suitable IPM (input power module) and adjusting the voltage settings.

Conclusion

The ISL97519IUZ-T is a versatile DC-DC switch regulator voltage regulator, suitable for a wide range of applications, such as embedded systems, baseband, broadband and industrial control systems. It is an efficient power solution and is available in a PQFN form factor. The device operates in an adjustable switching frequency range and supports different output voltage settings. It offers high current limit protection and other protection features, making it an ideal choice for low power operations.

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