UCC3813D-0G4

Frequency - Switching:	46kHz
Base Part Number:	UCC3813-0
Supplier Device Package:	8-SOIC
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Operating Temperature:	0°C ~ 70°C (TA)
Control Features:	Frequency Control
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	No
Duty Cycle (Max):	99%
Series:	--
Voltage - Supply (Vcc/Vdd):	6.9 V ~ 12 V
Output Phases:	1
Number of Outputs:	1
Topology:	Boost, Flyback, Forward Converter
Output Configuration:	Positive
Function:	Step-Up, Step-Up/Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tube

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UCC3813D-0G4 Application Field and Working Principle

Introduction to PMIC - Voltage Regulators - DC DC Switching Controllers

A PMIC - Voltage Regulators - DC DC Switching Controllers (also known as a buck converter) is a device that reduces the input voltage to an output voltage that is lower than the input. These converters are commonly used in devices such as computers, phones and other electronic equipment. The specific output voltage and current limits are usually specified in the converter’s datasheet.DC DC Switching Controllers offer several benefits, such as satisfying internal voltage requirements and accommodating external voltage requirements, as well as providing up to 90% efficiency. These converters typically operate at frequencies of up to 500kHz and are capable of providing output power ranging from 0.1W to several hundred watts.

UCC3813D-0G4 Application Field

The UCC3813D-0G4 is a dc-dc buck converter that is specifically designed for automotive applications. It operates from a wide 4.5V to 36V input voltage range, making it ideal for automotive electronics, such as battery-powered devices, automotive leds, power window applications and power seat applications.The UCC3813D-0G4 offers a fast and accurate programmable fixed voltage or adjustable voltage range of 1.2V to 33V at up to 400kHz switching frequency. The fast switching frequency enables designers to achieve high efficiency and small inductor and capacitor size.The device also features internal current limit, output voltage detection, thermal shutdown and undervoltage lockout. The output voltage is trimmed during programming and the trim accuracy is within ±10mV, making it suitable for automotive applications.

UCC3813D-0G4 Working Principle

A dc-dc buck converter works by switching current through an inductor between an input and output to regulate the output voltage. This is done by controlling the on-time and off-time in the switching cycle. During the on-time, current is transferred from the input to the output and builds up a stored magnetic field in the inductor. During the off-time, the inductor pushes the stored magnetic energy back to the load and a voltage related to the stored energy is produced in the output.For the UCC3813D-0G4, the switching frequency, the on-time, and the off-time are all programmable and adjustable, which allows for a desired output voltage to be achieved. The device also features a fixed current limit of 500mA and a programmable soft-start feature, which allows the output voltage to gradually increase to its intended value.The UCC3813D-0G4 also features a Predictive Current Mode (PCM) control that allows the device to provide a constant switching frequency even when the input voltage varies. This ensures that the output voltage is kept within the desired range, even when the input voltage fluctuates.

Conclusion

The UCC3813D-0G4 is a specifically designed DC DC Switching Controller for automotive applications. It offers a fast, accurate and programmable fixed voltage or adjustable voltage range of 1.2V to 33V, up to 400kHz switching frequency, and up to 500mA current limit. The Predictive Current Mode (PCM) control allows the device to maintain a constant switching frequency even when the input voltage varies. In addition, the device also features internal current limit, output voltage detection, thermal shutdown and undervoltage lockout, making it suitable for automotive applications.

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