SG1845Y-DESC

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SG1845Y-DESC is a DC to DC Switching Controller that falls under PMIC - Voltage Regulators. It is a highly integrated dual step-down synchronous switching controller that provides the power management solution for powering up highly efficient distributed power system with the capability of up to 6 phase. It is capable of programming variable frequency and phase modulation to further increase the efficiency of the system.

The SG1845Y-DESC is designed with a peak-peak current mode control loop and features a rich set of protection features including over-voltage protection (OVP), short-circuit protection (SCP), over-temperature protection (OTP), and over-current protection (OCP). The controller also provides adjustable switch current limit for both low side and high side switches and also includes a fast current ramp up/down feature for improved output voltage transient response.

The working principle for SG1845Y-DESC works by controlling the external power MOSFET switches in a synchronous rectifier configuration to convert a continuous input voltage into a constant regulated output with current matching. The synchronous rectifier is triggered by comparing its output voltage with the reference voltage taken from its feedback circuit that is provided by using an internal or external resistor divider. The SG1845Y-DESC uses current limit and voltage control circuitry to alter the duty cycle of its internal power MOSFET switches as it rectifies the input voltage waveform.

The SG1845Y-DESC provides a total of 8 voltage input options along with two additional reference pins to sense and regulate the output voltages. There is a single enable input that allows users to enable or disable the converter independently. The enable input is also used to put the converter into power saving mode and implemented as a digital input for microcontrollers to control. The upper side switch is optimized for MOSFET with an RDSON as low as 15mΩ to minimize the power dissipation.

The SG1845Y-DESC is broadly used in many industries, mostly in portable devices, such as digital cameras, mobile phones, notebook PCs and PDAs, networking and instrumentation equipment. It is also used in more advanced applications like LED driver, fuel cell and battery charger, automotive electronics, LED lighting and solar generator applications.

The SG1845Y-DESC also provides a built-in loop compensation and multi-loop architecture to regulate output voltage, load lockout/regulation/dynamic response, output and line over-voltage protection, output short circuit and overload protection. It also features thermal cycle shutdown, programmable soft-start, over-current limiting, frequency dithering and PWM/Skip mode. All of these features ensure that the SG1845Y-DESC performs reliably in the most demanding and extreme environments.

In conclusion, the SG1845Y-DESC DC to DC Switching Controller is a highly integrated dual step-down synchronous switching controller that provides the power management solution for powering up highly efficient distributed power system with the capability of up to 6 phase. It employs current limit and voltage control circuitry to alter the duty cycle of its internal power MOSFET switches and it is capable of programming variable frequency and phase modulation to further increase the efficiency of the system. It is broadly used in many industries, mostly in portable devices, such as digital cameras, mobile phones, notebook PCs, PDAs, networking and instrumentation equipment and other more advanced applications.

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