UC2843BD1G

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PMIC (Power Management Integrated Circuit) is a specialized IC for managing power in electronic systems. Voltage Regulators are a type of PMIC that helps regulates and outputs a voltage from a battery or other energy source. DC-DC Switching Controllers are a type of Voltage Regulators specifically designed for power supplies that have a higher current rating than traditional linear voltage regulation approaches. UC2843BD1G is one such example of a DC-DC Switching Controller.

The UC2843BD1G is a high current output, low voltage drop, low quiescent current regulator designed to power loads up to 10 Amps. The device is a complete monolithic solution that integrates numerous features to provide very low output ripple and high efficiency over a wide input voltage range. It features voltage and current regulation, output over-voltage protection, soft-start, under-voltage lockout, over-temperature protection, and current limit. The device also features an alarm output pin that can be used to signal an over-current or over-temperature conditions.

The UC2843BD1G is designed to operate in boost, buck, and buck-boost topologies with an adjustable internal PWM frequency from 40 to 200kHz. The device also features internal soft start and an enable pin for application flexibility. The device also includes a power good pin that can be used to indicate when the output voltage has reached the desired level.

The UC2843BD1G can be used in a variety of applications such as portable devices, multi-cell battery systems, DC motor control, off-line switching supplies, and voltage or current regulator. Its low quiescent current and high current output make it an ideal choice for applications where efficiency and power are key considerations. Additionally, its high input voltage capability and current limiting also make it well suited for use in high-current battery applications.

The UC2843BD1G is designed to drive an external MOSFET, which is connected between the input supply and the output load. The device is configured via an external resistor divider network that sets the desired output voltage. The device then monitors the output voltage level and adjusts the MOSFET gate drive signal to maintain the desired output. This happens at a high frequency, allowing higher current load capacity than could be achieved through linear regulation.

The UC2843BD1G also features current limiting, as well as over-voltage and over-temperature protection. When the device detects a voltage or temperature outside of the defined limits, the PWM comparator output is disabled to protect the load. The output over-voltage protection prevents the device from entering a runaway condition where the output voltage continues to climb above the desired level. This protection also works in conjunction with the current limit protection, so that if the output current ever becomes too high, the device will shut down the PWM output and shut off the MOSFET gate drive. This helps to prevent damage to the external FET, and ensures that the output current levels remain within a safe range.

The UC2843BD1G is a highly flexible switching controller that is designed to meet the needs of applications requiring high current, low voltage drop, and low quiescent current. Its wide input voltage range, current and over-voltage limit protection, and soft-start features make it an ideal choice for portable and battery-powered applications, multi-cell battery systems, and DC motor control. Additionally, its internal PWM comparator, high frequency operation, and power good pin make it well suited for a variety of other applications, including DC-DC switching power supplies.

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