SG3846DW

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The SG3846DW is a voltage-mode Pulse Width Modulation (PWM) controller intended to provide general control of a DC-DC converter in an intermediate supply. This device is part of a system solution that includes an external power MOSFET and a PWM control circuit. This type of voltage regulator can be integrated into many applications such as intelligent battery power management systems, automotive infotainment systems, handheld devices, or any application which inputs up to 20 V. The SG3846DW offers a wide input range, low quiescent current and high efficiency.

The SG3846DW is the perfect choice for a variety of DC-DC converter control applications. It provides a high voltage startup capability and a low-side c-mos power MOSFET to enabling higher efficiency, smaller size and light weight for applications that are size and weight sensitive. The SG3846DW can be programmed with a variety of voltage settings to accommodate the design requirement of the target application, such as an isolation transformer series buck / boost converters, and low standby current consumption.

The SG3846DW is a digitally programmable PWM controller that operates in a voltage-mode control and can be programmed to a wide range of output voltages and current ratings that are capable of delivering up to 200MHz or higher frequencies. The frequency of the PWM waveform is based on an external reference voltage or frequency, which can allow for a wide range of operating frequencies. The duty cycle of the PWM waveform is regulated according to the output voltage, while the maximum current limiting can be adjusted via external voltage. The SG3846DW also features a wide range of safety protections and adjustable undervollge lockout (UVO) and adjustable soft-start timing.

The SG3846DW can be used in intermediate voltage supply to deliver up to 20V for applications like cloud communications, mobile charging, Smart Card interfacing, memory modules, industrial sensors, and other applications that require tight regulation and excellent dynamic response. It is suitable for industrial, consumer and communication equipment.

The external power MOSFETs are used in conjunction with the SG3846DW in order to achieve the desired output power. The external MOSFETs need to have the adequate RDS(on) resistance to provide the necessary output current and power, while keeping losses low and ensuring reliable start up and shutdown. The input voltage can be programmed up to 20V or higher depending on the application requirements.

To ensure optimal start up and shutdown performance, the SG3846DW includes internal components such as start up comparators, current limit comparators, overvoltage protection, UVLO and PS(on) comparators. The overvoltage protection comparator prevents output voltage from rising beyond the desired voltage. The UVLO comparator, which is used to detect a valid input voltage, ensures that the SG3846DW’s internal control circuitry is not activated when the input voltage is too low, prevents erroneous operations and helps reduce battery drain.

The SG3846DW is ideal for a variety of voltage regulator applications as its low quiescent current characteristics enable more efficient power management. It is a highly efficient and cost-effective solution for designing high current and high density DC-DC applications, as it offers high switching frequency and superior dynamic response.

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