LT1374CR-5SYNC#TRPBF

PMIC - Voltage Regulators - DC DC Switching Regulators

The LT1374CR-5SYNC#TRPBF is a 4-terminal integrated circuit from Linear Technology Corporation. This DC-DC converter is a high efficiency, low quiescent power buck switching regulator. It is designed to be used in a variety of switched converter applications, such as automotive, communication, portable electronics, data acquisition and power management systems. It has an input voltage range of 2V to 16V, and a regulated output of 0.5V to 15V. The LT1374CR-5SYNC#TRPBF has a low quiescent current of 2 mA, and a very high efficiency of greater than 95%. It also has an adjustable switch frequency from 300kHz to 1.5MHz, which enables optimized performance and reduced EMI.

The LT1374CR-5SYNC#TRPBF is ideal for automotive and portable applications requiring low voltage, high efficiency and low quiescent power. The advanced capabilities of the device such as low dropout operation, fast transient response, adjustable switching frequency and low voltage turn-on, make it perfect for space saving and efficient power management. The device also supports an on-board soft-start, to reduce output inrush current on initial connection. An external Synchronization capability through the SYNC pin allows multiple devices to be synchronously connected in a parallel configuration to evenly spread losses across all synchronous part.

The LT1374CR-5SYNC#TRPBF is designed to be used in applications with high voltage requirements and a need for high efficiency and low power consumption. Typical applications include servers, storage systems, power distribution systems, auxiliary power systems, motor control, and voltage regulation in automotive and battery-powered applications. The device can be used to supply several different output voltages, and can be configured for a wide range of input and output voltages. The LT1374CR-5SYNC#TRPBF offers excellent thermal stability and protection features such as thermal shutdown, over current protection, and short circuit protection.

Working Principle

The LT1374CR-5SYNC#TRPBF includes an input voltage sensing circuit, an output voltage reference circuit, two error amplifiers, a PWM comparator, an oscillator, power-up circuitry, and gate drivers with integrated gate series resistors. It has an adjustable synchro-clock (SYNC) input and an output voltage trim window (VTT) pin, allowing the user to optimize the parameters for a specific application.

The device employs a synchronous, buck switching topology. The on-chip oscillator determines the PWM frequency. When the supply voltage is applied, the error amplifiers monitor the output to reference voltage and compare the errors with the PWM signal in a comparator. If the error is high, the PWM signal is turned off and current is prevented from flowing from the input to the output. When the error signal drops low, the PWM signal is switched on again and current is supplied to the output. By controlling the duty cycle of the PWM signal, the voltage on the output is regulated.

The SYNC Terminal can be used for synchronization of multiple switching regulators, for noise reduction. This can help reduce output ripple and EMI. When synchronized, the multiple devices are always forced to the same duty cycle and so the output voltage is evenly distributed across all synchronous devices. This allows multiple devices to be connected in parallel, while using a single input voltage source.

Conclusion

The LT1374CR-5SYNC#TRPBF is a high efficiency, low quiescent power, buck switching regulator from Linear Technology Corporation. It is designed to be used in a variety of applications, with an input voltage range of 2V to 16V, and a regulated output of 0.5V to 15V. The device has an adjustable switch frequency from 300kHz to 1.5MHz, and can be configured for a wide range of input and output voltages. It also has an external Synchronization capability for multiple devices. The LT1374CR-5SYNC#TRPBF provides excellent thermal stability and protection features, making it ideal for automotive and portable applications requiring low voltage, high efficiency and low quiescent power.