LTC3731IUH#TRPBF

PMIC - Voltage Regulators - DC DC Switching Controllers

LTC3731IUH#TRPBF is an integrated circuit specifically designed to provide a variety of DC to DC conversion strengths. It is a switching controller used in voltage regulator power supplies. Along with integrated FET drivers, it can create efficient and flexible power supplies from a variety of input sources. The device package is enhanced for power dissipation and has a small form factor for enabling thermal relief in confined areas on the PCB.

Application Field

The LTC3731IUH#TRPBF is designed for industrial and automotive applications, as well as power supply design for portable devices. These devices can also serve as the basis for any DC to DC switching power conversion needs in portable computing, telecommunications, network and storage applications; power management systems; motor control circuits; battery charger systems; and DC to AC power inverter products.

Features and Benefits

• Multiple integrated protection features
• Soft-start; power-up and power-down sequencing
• Frequency monitoring with optional cycle-by-cycle current limit
• Integrated MOSFET drivers and gate-drive circuits
• Integrated bootstrap diode and dual input level-shift circuits
• Programmable current-mode control
• Oscillator frequency up to 1MHz
• Small 4mm x 4mm HTSSOP-14 package

Working Principal

LTC3731IUH#TRPBF is a DC-DC power supply controller that is used for voltage regulator and boost converters. This integrated circuit generates PWM signals for driving an external MOSFET to regulate the output voltage. It employs a voltage-mode current control loop to control the output current in the power stage. The output voltage is sensed by the internal error amplifier, which then compares the sensed voltage with a reference voltage and continuously adjusts the duty cycle of the PWM signals accordingly. This allows the output voltage to remain stable and close to the desired output voltage.

The LTC3731IUH#TRPBF also incorporates a number of features such as soft start, current limit, and thermal shutdown circuit that simplify DC-DC power design and operation. The thermal shutdown circuit monitors the junction temperature of the device and shuts down when it is reached. This provides protection from over temperature conditions. The current limit circuit is designed to limit the output to the desired peak current limit. It also offers short-circuit protection by detecting the voltage across the MOSFET drain terminal and comparing it to the user-programmable current limit threshold.

The LTC3731IUH#TRPBF also offers a programmable dead time window, which is used to control ringing at the output. This helps reduce the amount of voltage ripple or noise. The integration of pre-driver and gate-drive circuits ensures that the MOSFET switches at a precise and precise timing. This helps maximize efficiency, minimize power loss, and reduce the switching noise of the power supply.

Conclusion

The LTC3731IUH#TRPBF DC-DC switching controller is a highly integration, flexible, and efficient solution for a wide range of applications. The integrated protection and pre-driver features improve system reliability and reduce design complexity. All of these features combined make the LTC3731IUH#TRPBF an ideal choice for a variety of DC-DC switching power supply applications.