UC2845AQDR Integrated Circuits (ICs)

Frequency - Switching:	500kHz
Base Part Number:	UC2845AQ
Supplier Device Package:	14-SOIC
Package / Case:	14-SOIC (0.154", 3.90mm Width)
Operating Temperature:	-40°C ~ 125°C (TJ)
Control Features:	Frequency Control
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	No
Duty Cycle (Max):	48%
Series:	--
Voltage - Supply (Vcc/Vdd):	7.6 V ~ 30 V
Output Phases:	1
Number of Outputs:	1
Topology:	Boost, Flyback, Forward Converter
Output Configuration:	Positive, Isolation Capable
Function:	Step-Up, Step-Up/Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction to UC2845AQDR

The UC2845AQDR is a high-performance and cost-effective 5.0V fixed output voltage monolithic switching regulator controller from Texas Instruments. It is designed to help engineers quickly and conveniently develop efficient and reliable DC to DC regulated solutions.The UC2845AQDR belongs to Texas Instruments’ PMIC (Power Management Integrated Circuit) portfolio of integrated solutions for power regulation and management. It is specifically categorized under Voltage Regulators, and more precisely as a DC to DC Switching Controller.

Functionality and Features of UC2845AQDR

The UC2845AQDR provides a wide range of features and capabilities to support the efficient design of DC to DC regulated solutions. It provides a maximum current of up to 0.9A, an adjustable fixed output voltage, and an adjustable switching frequency. Additionally, it includes a built-in power-on reset function, ensuring proper power supply signaling and protection.The UC2845AQDR is constructed with a monolithic low-dropout regulator that offers low dropout voltage with a maximum of 400mV at full load. It is thus suited for use with a wide range of power sources and can efficiently convert the voltage from a lower level to the desired 5.0V regulated output voltage.In addition, the UC2845AQDR has an adjustable frequency range of 200kHz to 1.3MHz, allowing it to accommodate a variety of applications. It also has a low standby current of only 80μA, and when operating in regulation it can achieve efficiencies in excess of 90%.The UC2845AQDR is also designed to offer a number of protections and functions to protect the circuit from dangerous errors and faults. These include thermal shutdown, line and load fault protection, and adjustable overtemperature protection.

Applications of UC2845AQDR

The UC2845AQDR is suitable for a wide range of applications. It is ideal for general-purpose DC/DC regulation, providing robust current and voltage regulation for systems requiring 5V regulation.The UC2845AQDR is well-suited for automotive applications such as electronic engine management systems and electronic parking brakes. It can also be used in industrial-grade robotics, machine tools, and other equipment requiring reliable, energy efficient and economical 5V DC to DC regulation.Additionally, the UC2845AQDR can be used in portable battery operated devices, such as smart wearables, portable medical devices, and Internet of Things (IoT) devices.

Working Principle of UC2845AQDR

The UC2845AQDR is a monolithic 5.0V fixed output voltage switching regulator controller. It is designed to provide a guaranteed regulated voltage of 5.0V from a much lower starting unregulated voltage.The UC2845AQDR works on the principle of Pulse-Width Modulation (PWM). It starts by monitoring the input voltage and the output load. When the output voltage drops below the desired 5.0V level, the controller initiates a pulse width modulated signal to the power switches. This pulse-width modulated signal essentially provides the necessary switching signal to the external MOSFET transistors, which switch on and off rapidly, allowing the current to flow into the inductor and then out towards the load as regulated 5.0V.Furthermore, the UC2845AQDR also confines the peak current flowing through the switching MOSFETs through its current control function. When the output voltage drops, the current control signal works in reverse, increasing the pulse width of the switching signal to allow more current to flow and maintain the regulated output voltage.The controller provides all the necessary protection features, including overvoltage and overtemperature protection. Additionally, it allows for adjustable overcurrent protection, allowing for safe operation from a wide range of input voltages.

Conclusion

The UC2845AQDR from Texas Instruments is a high-performance and cost-effective monolithic 5.0V fixed output voltage switching regulator controller. It allows for easy and efficient development of DC-DC regulated solutions, and is suitable for a wide range of applications, such as automotive, industrial, and portable battery-operated systems and devices.The UC2845AQDR works on the principle of Pulse-Width Modulation and provides a number of protections and features to ensure safe operation from a wide range of input voltages and current flow. It is an excellent choice of voltage regulator for designing efficient and reliable DC-DC systems.

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