UC2825AQG3

Frequency - Switching:	400kHz ~ 1MHz
Base Part Number:	UC2825A
Supplier Device Package:	20-PLCC (9x9)
Package / Case:	20-LCC (J-Lead)
Operating Temperature:	-40°C ~ 85°C (TA)
Control Features:	Current Limit, Frequency Control, Ramp, Soft Start
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	No
Duty Cycle (Max):	50%
Series:	--
Voltage - Supply (Vcc/Vdd):	8.4 V ~ 22 V
Output Phases:	1
Number of Outputs:	2
Topology:	Boost, Flyback, Forward Converter, Full-Bridge, Half-Bridge, Push-Pull
Output Configuration:	Positive
Function:	Step-Up, Step-Up/Step-Down
Output Type:	Transistor Driver
Part Status:	Obsolete
Packaging:	Tube

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UC2825AQG3 Application Field and Working Principle

The UC2825AQG3 is an integrated monolithic synchronous rectifier step-down regulator designed for use in power management circuits. It is part of the UC28 family of integrated circuit (IC) switch controllers from Texas Instruments that are used to regulate DC/DC power supplies. It is a voltage regulator made specifically to control the voltages produced by a DC/DC converter.The UC2825AQG3 is classified as a PMIC (precision motor interface controller) voltage regulator that performs switching and conversion of voltage levels. It is part of a family of DC/DC switch controllers used to provide efficient and highly stable switching regulation of different output power supply voltages. It is specifically classified as a DC/DC switching controller.The UC2825AQG3 has an extended voltage and current operating range, making it suitable for a wide range of applications. It is used in automotive and industrial applications requiring both high efficiency and high reliability. It is used in power supplies for telecom, consumer, and medical devices that require small packages and low power consumption, as well as consumer electronics, such as cellphones, PDAs, and digital cameras.The UC2825AQG3 is a precision digital IC that can precisely control the voltage of a DC/DC converter. It offers a simple, integrated solution for step-down voltage regulator applications. When used in conjunction with a power MOSFET and resistors, the UC25AQ supports a wide range of output currents.The UC2825AQG3 features a synchronous rectification control that allows for efficient MOSFET die size reduction. It also offers a current mode control loop implementation with precision peak current sensing and programmable soft-start and a power good output. It includes an adjustable soft-start circuit to prevent large inrush currents and overstress of the system components on start-up.The UC2825AQG3 also offers different protection features, such as undervoltage lockout (UVLO), cycle-by-cycle current limiting, thermal protection, and overvoltage protection (OVP), as well as programmable dead time to minimize switch stress. The device also includes an integrated MOSFET to provide a power switch gate drive that can support multiple power components.The UC2825AQG3 has an output voltage range of 1.1 V to 32 V and an output current range of up to 1.5A. It supports an input voltage range of up to 40 V and features a peak current mode control with programmable frequency of up to 500 kHz.The UC2825AQG3 working principle is easy to understand. The device has two main functions: voltage control and switching. It works by receiving a signal from the DC/DC converter and controlling the voltage as needed. It also acts as a power switch, switching between different voltage levels as demanded. When the input voltage is below the regulated output, it allows a current to flow and switch to the higher voltage level. When the input voltage exceeds the regulated output, the device switches to the lower voltage level. When the input rises above the maximum rated voltage, the device shuts down for protection.In summary, the UC2825AQG3 is an integrated monolithic synchronous rectifier step-down regulator from Texas Instruments that is made specifically to regulate DC/DC power supplies. It is classified as a PMIC voltage regulator and a DC/DC switch controller and is used in a wide range of applications where high efficiency and reliable voltage control is needed. Its working principle is based on voltage control and power switching. With its extended voltage and current operating range, it is a great choice for many applications.

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