LT1934IS6-1#TRMPBF

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PMIC - Voltage Regulators - DC DC Switching Regulators

The LT1934IS6-1#TRMPBF is a high-performance, three-terminal, wafer-level synchronous buck switching regulator based on Linear Technology’s latest polynomial architecture, which provides a continuous output current up to 3A. This device is designed to deliver the easiest solution for most power conversion requirements and is highly suitable for input voltage range of 4.75V to 16V, making it ideal for point-of-load power source conversion.

Application Field

The LT1934IS6-1#TRMPBF is a broad-range voltage regulator, suitable for use in a variety of applications, such as telecom, networking, POS, UPS, server and storage systems, industrial process control, battery-powered applications and automotive electronics. Its features make it adaptable to a variety of voltage requirements.

The device works by regulating the output voltage of the system, regardless of the changes in input voltage or load current. This results in stable and uniform performance, providing excellent power efficiency. In addition, it also offers short-circuit and over-temperature protection. Moreover, the LT1934IS6-1#TRMPBF is operated with 1.5MHz switching frequency, allowing small form factor board layout.

Working Principle

The LT1934IS6-1#TRMPBF operates by using a Pulse Width Modulation (PWM) control approach. The PWM controller ensures a constant output voltage for a wide input voltage range and heavy load variations. The main task of a PWM regulator is to control the output voltage by controlling the duty cycle of an applied Pulse Width Modulated (PWM) signal. The regulated output voltage enables the load to operate within the voltage range. When a constant voltage load is connected to the regulator, the PWM signal is kept constant and the output voltage is regulated. The PWM controller keeps the power dissipation in the switches and inductor within the given operating temperature limits.

The PWM regulates the output voltage by comparing the regulator’s error amplifier output voltage with the voltage at the feedback pin. This produces the duty cycle of the PWM signal and the output power is proportional to the duty cycle. When the input voltage is too low or the output current is too high, the duty cycle is reduced and the voltage to the load is correspondingly reduced. Conversely, when the input voltage is too high or the output current is low, the duty cycle increases and the voltage is correspondingly maintained.

The Universal Synchronous Rectifier (USR) topology in the LT1934IS6-1#TRMPBF allows the use of low cost MOSFETs with minimum RDS(on). This topology also reduces the voltage across the switches and provides the highest power efficiency. Moreover, the synchronous rectification allows for a minimal output voltage-drop, improving overall power transfer efficiency of the regulator.

The LT1934IS6-1#TRMPBF offers various functions like soft-start, under-voltage lockout, over-current protection and short-circuit protection. The constant frequency pulse-by-pulse current limiting not only allows the device to maintain high power efficiency, but also ensures an acceptable loop response.

The LT1934IS6-1#TRMPBF also offers a high-impedance mode, which lowers the switch losses and allows the device to maintain a high power efficiency even in light-load operation. The device is available in 1.8V and 2.5V output models, with wide input voltage range from 4.75V to 16V, and high output current up to 3A. The board-level components can be minimized due to its high switching frequency.

Conclusion

In conclusion, the LT1934IS6-1#TRMPBF is a high performance, three-terminal, wafer-level synchronous buck switching regulator, providing high efficiency, low noise operation and full regulation from a 4.75V to 16V input voltage range. The device is suitable for many applications, including telecom, networking, POS, UPS, server and storage systems, industrial process control, and battery-powered applications. This device successfully solves most power conversion requirements and even with its short-circuit, temperature and over-voltage protection, it offers superior performance.

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