UC3526NG4

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The UC3526NG4 is a DC/DC switching controller and is one of the most popular voltage regulators used in PMIC applications. It is a presettable, non-synchronous Buck controller with a wide input voltage range of up to 65 V and output voltage ranges from 0 V to 45 V. It is designed to provide excellent ripple rejection and fast transient response while maintaining low noise operation. The UC3526NG4 is suitable for a wide variety of applications such as battery-operated systems, up and down converters, and power supplies.

The UC3526NG4 is a monolithic integrated circuit which includes an adjustable voltage reference, PNP power and driver transistors, a current limit threshold circuit, a fixed frequency oscillator, an over-voltage comparator, and a soft-start circuit. The control and reference components are isolated from the primary power supply. This enables the UC3526NG4 to operate from input voltages from 8 to 45 volts and to provide a wide range of output voltages.

The UC3526NG4 provides an adjustable output voltage by controlling the on and off times of the PWM pulses which drive the power MOSFETs or power transistors that provide the regulated output voltage. The UC3526NG4 offers a frequency accuracy of +/- 1% over temperature and offers excellent noise immunity by running a fixed frequency PWM control. It has an adjustable frequency range of 1kHz to 500kHz.

The UC3526NG4 has several features that make it desirable for Power Supply and Battery backed applications. The onboard feedback resistor can be set to divide the output voltage to an adjustable range between 0 and 45V. This eliminates the need for external feedback components and provides a wide range of output voltage options. The UC3526NG4 also offers soft-start and current limit circuits which protect the power supply from excessive power dissipation and can extend the life of certain components. One of the more unique features of the UC3526NG4 is the constant duty cycle feature which allows current mode control of the Pulse Width Modulation (PWM) for improved dynamic response during load changes.

The UC3526NG4 is a versatile voltage regulator and can be used in many applications. These include battery-operated systems, up-down converters, power supplies, and audio/telecommunications equipment. The UC3526NG4 offers wide input and output voltage ranges, excellent ripple rejection, fast transient response, and low noise operation, making it an ideal solution for many power management applications.

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