LTC1877IMS8#TRPBF

The LTC1877IMS8#TRPBF is a buck regulator, combined with monolithic CMOS, ideal for step-down applications. This particular regulator features integrated high- and low-side MOSFETs and works from 2.1V to 38V input range. It offers several features such as programmable output voltage, selectable switching frequency, external synchronization and peak-current-mode control.

The LTC1877IMS8#TRPBF device is ideal for use in wide variety of step-down switching applications including automotive accessories, motor drivers, and single-cell Li-ion/Li-Po battery systems. It is widely used in the automotive, commercial, and industrial markets.

Application Field:

• Automotive electronics
• Motor control
• Consumer electronics
• Portable equipment
• AC/DC adapter
• Industrial control

The LTC1877IMS8#TRPBF device supports a wide input voltage range from 2.1V to 38V, current mode and variable frequency control plus external synchronization. This part requires an external MOSFET and inductor for a complete power conversion solution. The device has a single shutdown/enable pin and provides a current output for monitoring and voltage loop stabilization.

Working Principle:

The LTC1877IMS8#TRPBF employed the unique current-mode architecture to provide fast transient response, excellent line and load regulation and light-load efficiency. An internal current-mode PWM provides fast transient response and cycle-by-cycle current limit. The current limit is programmable by connecting a resistor between the CS and GND pins. The oscillator frequency is also programmable by connecting an external resistor to the RT pin.

The device\'s peak-current-mode control architecture allows either fast or slow transient response depending upon the selection of an external capacitor connected between the COMP and GND pins. This feature provides the designer with more flexibility to optimize the loop stability in order to achieve a good steady-state performance. It employs a dual-current-sense architecture which features a low voltage drop at the current sensing path and a high voltage drop at the voltage sensing path.

The SYNC pin allows for external synchronization for applications in which noise or interference may be a problem. The device offers comprehensive protection features such as input UVLO, cycle-by-cycle current limit, soft-start, and short-circuit protection.

Overall, the LTC1877IMS8#TRPBF is a highly efficient, high power density, cost effective DC/DC Buck regulator using Current-Mode Control with integrated high- and low-side MOSFETs. The device is ideal for a variety of high-current, low-voltage applications in the automotive, commercial, and industrial markets.