UCC3813PWTR-0 Integrated Circuits (ICs)

Frequency - Switching:	46kHz
Base Part Number:	UCC3813-0
Supplier Device Package:	8-TSSOP
Package / Case:	8-TSSOP (0.173", 4.40mm 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:	Tape & Reel (TR)

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UCC3813PWTR-0 Application Field and Working Principle

The UCC3813PWTR-0 is a step-down switching controller with wide input voltage range. It is categorized as a PMIC (Power Management Integrans) specifically to Voltage Regulators and DC-DC Switching Controllers. It helps convert the main AC and DC input voltage, to specific voltage and current levels as required by other devices in the system, both efficiently and with superior electrical performance.

Overview

The UCC3813PWTR-0 is capable of working with an input voltage ranging from 3V to 35V, making it applicable to several applications like notebooks with mobile processors, mobile phones and external power supplies. This is done by accurately regulating the output voltage and current through a topology of the synchronous buck converter. It also features low power requirements which helps to decrease the overall power consumption, thus extending the device’s lifetime. There are several other features on the UCC3813PWTR-0, such as thermal protection and oscillator synchronization, also stating double pulse mode and fast current limit, among other important specifications.

Features

Wide Operating Input Voltage:The UCC3813PWTR-0 is equipped with an input voltage range from 3V to 35V, offering various opportunities for self-sustaining applications. This wide voltage range allows the unit to work in various power supplies and other power-management applications.Thermal Protection:The UCC3813PWTR-0 also provides thermal protection across the device, giving it stable operations at higher temperatures. The thermal protection helps to safeguard the device from over-heating and power derating, ensuring that all other components in the system work properly.Oscillator Synchronization:The UCC3813PWTR-0 is also supports the synchronization of its operating frequency to the clock of an application, allowing operation to be more accurate, reliable, and dynamic. It also makes the device\'s output voltage more stable and efficient.Double Pulse Mode and Fast Current Limit:The UCC3813PWTR-0 also provides extra protection by implementing a Double Pulse mode, as well as a Fast Current limit. This helps to protect sensitive components from overheating, and safeguard them from current overload as well.Low Supply Current:The UCC3813PWTR-0 requires a very low supply current, meaning it has one of the lowest operating current available on the market. This helps to reduce the overall power requirements and conserve battery life. It also greatly increases the unit’s life span, since the device does not require a large amount of power to function properly.

Applications

The UCC3813PWTR-0 can be used in many application fields. In mobile phones, it can be used to step-down the main 5V or 3.3V supply to a low voltage, making it suitable for application processors, display drivers, and audio amplifiers. In notebooks with mobile processors, the device can convert the main AC input to a voltage suitable for the processor to run in a stable state.Apart from mobile phones, the UCC3813PWTR-0 can also be used in external power supplies for low power wattages. It can be used in SMPS (Switch Mode Power Supplies) to switch the AC input voltage into DC. In other power-management applications, it can be used to convert the input voltage to the desired output voltage, saving power in the process.

Working Principle

The UCC3813PWTR-0 operates by using a topology of the synchronous buck converter, which is composed of an inductor, an H-bridge switch, a diode, and a feedback loop. This helps to convert the main input voltage into the specified voltage and current levels.The regulator’s operating frequency is dependent on the temperature, driving current and the threshold voltage. When the voltage is applied to the buck converter, the supply\'s internal H-bridge switch ensures that the voltage is switched from high to low states. The inductor then stores energy to drive the regulator circuit for maintaining a constant output voltage over the entire operating voltage range.The feedback loop also helps to maintain a constant output voltage by comparing the error between the sensed output and the set-point voltages. If the sensed output is higher than the set-point voltage, the control logic will reduce the control voltage of the H-bridge, which reduces the amount of energy stored in the inductor, and consequently reducing the output voltage. On the other hand, if the sensed output is lower than the set-point voltage, the control logic will increase the control voltage of the H-bridge, allowing more energy to be stored in the inductor, thus increasing the output voltage.

Conclusion

The UCC3813PWTR-0 is a step-down switching controller with a wide input voltage range, and is categorized as a PMIC (Power Management Integrans) specifically to Voltage Regulators and DC-DC Switching Controllers. It is capable of accurately regulating the output voltage and current levels over a wide range of input voltages, and also features various protection and low power requirements, making it suitable for many applications such as mobile phones, notebooks, external power supplies and other power-management applications. It operates on a topology of a synchronous buck converter, which uses an inductor, an H-bridge switch, a diode and a feedback loop to regulate the output voltage, and provide other important features.

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