TL3845BD-8

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PMIC (Power Management IC) : Voltage Regulators : DC DC Switching Controllers

TL3845BD-8 integrated circuit (IC) is an integrated, ultra-low quiescent power voltage regulator from Texas Instruments that offers protection to the load. It operates at an input voltage range of 1.8V-6V and has an adjustable output current that extends up to 40A. This integrated circuit can support adjustable output currents with a peak output current of up to 50A, allowing it to be used in high-current applications.

TL3845BD-8 is a step-down DC/DC converter that is available in 2-pack, 4-pack, and 5-pack choices. The device is usually mounted on a printed circuit board (PCB) and contains an active current limit technology, a soft-start function, and an over-temperature protection feature. Additionally, it can support single-ended PWM and two-level control. The switch in this IC features a minimum ON-time of 180ns, allowing it to reach a maximum frequency of 8MHz.

TL3845BD-8 IC is specifically designed for use in battery-powered, mobile applications. It is ideally suited for applications such as car radios, mobile phones, digital cameras, personal digital assistants (PDA\'s), laptop and notebook PCs, digital cameras, and handheld instruments. The IC\'s over-temperature protection and approximately 1.5% (Integrated oscillator-based) and 1.2% (external clock-based) accurate current limit features provide reliable operation for these applications.

TL3845BD-8 Working Principle

TL3845BD-8 is a DC-DC switching controller that uses the current mode architecture with an external voltage regulator MOSFET. It offers a very low quiescent current of 130µA and adjustable overall control loop bandwidth for maximum flexibility and performance.

The current mode control architecture is used to control the current flowing through the circuit, thereby regulating the output voltage. It also helps to reduce electromagnetic interference (EMI) from long-term operation. The primary benefit of this architecture is the reduced output voltage ripple and improved transient response.

The current mode control allows the TL3845BD-8 to have fast and accurate line and load transient response. Additionally, the device features an adjustable input voltage rejection (ISR). This feature helps to reject ripple noise in the output voltage, thus delivering a clean power. The ISR allows TL3845BD-8 to achieve an ultra- low quiescent current while maintaining an excellent output voltage regulation.

TL3845BD-8 also features an adjustable overall control loop bandwidth that allows users to optimize the whole controller performance based on the design requirements. The device offers maximum flexibility and performance with an adjustable switching frequency of up to 8MHz.

Conclusion

TL3845BD-8, from Texas Instruments, is an ultra-low quiescent power voltage regulator with an input voltage range of 1.8V-6V and an adjustable output current of 40A. It is available in 2-pack, 4-pack, and 5-pack choices and is designed for use in battery-powered, mobile applications. TL3845BD-8 features an adjustable overall control loop bandwidth and can achieve maximum frequencies of 8MHz. It also features currentsense and over-temperature protection features. All these features, combined with its low quiescent current of 130µA, make it an ideal choice for a wide range of applications.

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