LT1933HDCB#TRMPBF

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Introduction to LT1933HDCB#TRMPBF

LT1933HDCB#TRMPBF is part of Texas Instruments\' family of DC-DC switching regulators, providing high-performance, low noise, and low power solutions for applications that require regulated output voltages. The LT1933HDCB product is based on a "PFM" (Pulse Frequency Modulation) rather than a PWM (Pulse Width Modulation) control architecture, and is capable of output current up to 1A and provides a regulated output up to 10V.

Application fields

LT1933HDCB can be used in a variety of applications. It is ideal for low-power, low-noise requirements in cellular phones, personal digital assistants (PDA), medical and industrial power supplies, notebook computers, automotive and portable applications.Its low-noise, constant-frequency PFM architecture makes it a good choice for power supplies with tight regulation, such as those found in network and telecommunications systems.

The device also features a low quiescent current, a wide input voltage range, and operates from -40°C to +125°C. This combination of features makes the device well suited for a wide variety of portable and low power applications. The switch current limit is adjustable to attain desired efficiency and peak current levels. The device includes a low battery detector, shutdown control, power good output, and adjustable soft-start.

Working principle

The LT1933HDCB#TRMPBF uses PFM (pulse frequency modulation) technology to regulate the output voltage. In this architecture, the operating frequency is controlled to maintain the output voltage at a constant level. When the output voltage increases, the operating frequency is reduced, and vice versa. The output voltage can be programmed with an external resistor divider. The circuit uses an external switch (usually an N-MOSFET) to control the inductor current. The inductor current is sensed via a current-sense resistor, and is then converted to a voltage for regulation.

The PFM technology also enables the device to operate in low-dropout (LDO) mode when the input voltage is close to the output voltage. This increases the efficiency of the converter and reduces the dropout voltage losses, arching the total efficiency of the device. The voltage is maintained by increasing the duty cycle of the switch as the load increases. This makes it well suited for applications where the load current is varying or needs to be regulated in a very tightly regulation range.

The LT1933HDCB#TRMPBF features a low quiescent current of only 400μA and provides up to 1A of output current. It also features a wide input voltage range from 2.5V to 10V, making it suitable for a wide variety of battery powered applications. The device is also capable of operating from -40°C to +125°C which makes it ideal for automotive, industrial and medical applications.

Conclusion

The LT1933HDCB#TRMPBF is an ideal solution for applications that require a low noise, low power, and high performance DC-DC switching regulator. It is suitable for a wide variety of battery powered applications due to its wide input voltage range and operating temperature range. Its low quiescent current and high output current capabilities make it ideal for low power designs. With its PFM control architecture and adjustable soft-start, it is an ideal solution for applications that require tightly regulated output voltages.

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