RT5785BGJ8F

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With the expansion of electronic products in recent years, a variety of innovative circuit designs have been put forward to satisfy the broad application demands of devices. One of them is RT5785BGJ8F, which has recently been widely used in low-power designs. RT5785BGJ8F belongs to PMIC - Voltage Regulators - DC DC Switching Regulators, with unique advantages and characteristics.

RT5785BGJ8F is a synchronous step-down DC/DC regulator with a wide input voltage range of 3V to 16V, and operates up to 3.6MHz. It includes two external power MOSFETs and can deliver output current up to 8A with excellent line and load regulation. An additional low resistance integrated bypass MOSFET can be enabled during light loading conditions to reduce the power loss.

In addition, the pulse frequency modulation (PFM) and automatic pulse-skipping frequency modulation (APSFM) design make RT5785BGJ8F capable of working in both continuous conduction mode (CCM) and discontinuous conduction mode (DCM). It also features built-in compensation networks, accurate over-current protection, soft start, under-voltage lock out (UVLO) etc. The built-in thermistor OTP monitors the junction temperature and automatically increases the switching frequency to reduce the power consumption.

Utilizing the advanced switching power topologies, RT5785BGJ8F has low start up current, low operating current and high efficiency up to 97%.Moreover, it provides active output voltage output tracking, enabling tight regulation of the output voltage for fast dynamic load transients. The superior dynamic response and stability characteristics of RT5785BGJ8F make it ideal for low-power applications such as notebook and portable PCs, cell phone chargers, digital radios, portable multimedia players, etc.

The working principle of the RT5785BGJ8F is that it senses the output voltage, shifts the power MOSFETs, and synchronously rectifies the output current via the integrated synchronous rectifier MOSFETs. The output voltage is regulated by adjusting the duty-cycle of the fixed frequency pulse width modulated (PWM) control waveform. During light loading conditions, the internal bypass MOSFET will be enabled to reduce the power loss.

The RT5785BGJ8F has several protection modes, including over current protection (OCP), over voltage protection (OVP), thermal shutdown (TSD) and under-voltage lock out (UVLO). In addition, the fault flag output signals alert system for the fault events. This provides a robust protection for the RT5785BGJ8F and the system.

In summary, the features of the RT5785BGJ8F make it an ideal choice for low-power applications. It has a wide operating input voltage range, high efficiency and superior dynamic response characteristics. The multiple protection modes and fault flag signals provide robust system protection, making RT5785BGJ8F suitable for use in various types of products.

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