LT3991EDD#TRPBF

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The LT3991EDD#TRPBF by Linear Technology is a monolithic buck converter that is perfect for applications requiring heightened power stability and precision. It is a DC-DC Switching Regulator which offers output voltages ranging from 1.2V to 5V. The operating frequency range can be adjusted from 300 kHz to 2.3 MHz, and a high step-down ratio allows it great flexibility of design. This makes it an ideal choice for applications such as high efficiency power supplies, variable voltage generators, and battery chargers.

Features:

• Input voltage range up to 36 volts
• Output voltage range from 1.2 volts to 5 volts
• Output current up to 3A
• Operating frequency range from 300kHz to 2.3 MHz
• High efficiency switching from 85% to 93%, with no minimum load required
• Advanced current mode control for superior line/load transient performance
• Frequency jittering for reduced EMI
• Soft start for converge time and in-rush current control
• Fault protection features including current limit and thermal protection
• Small MSOP-10 package

Applications:

• Battery charging
• Variable voltage generators
• High efficiency power supplies
• Medical electronics
• Lighting control systems
• Data acquisition systems

Working Principle

The LT3991EDD#TRPBFB is a monolithic buck converter that is based on a voltage-mode, current-mode hysteretic-controlled switching regulator. It uses a high-efficiency, self-oscillating, synchronous buck architecture to adjust the output voltage. The output voltage is adjusted by the voltage-mode or current-mode control loop. The current-mode control loop enables the circuit to maintain a fast response to load transients, large output current, and adjustable ripple frequency. The voltage-mode control loop monitors the output voltage and maintains the regulation as the load current fluctuates. The operating mode is enabled by selecting a FSEL pin voltage between 1.2V and 3V, with 1.2V corresponding to the voltage-mode control and 3V corresponding to the current-mode control.

The LT3991EDD#TRPBF also contains several fault protection features to protect the IC from damaging conditions. The thermal protection feature limits the output current if the die temperature exceeds a certain temperature. This feature prevents the IC from operating above its rated temperature and protects against over-current fault conditions. The current limit feature limits the output current when it exceeds the set current limit threshold. This feature helps to protect against over-current fault conditions. Finally, the UVLO feature reduces quiescent current when the DC supply falls below the set threshold voltage. This prevents the circuit from operating when the DC voltage is too low, thus protecting the IC.

Overall, the LT3991EDD#TRPBF is a high efficiency, high-precision, monolithic buck converter. It can be used in a wide variety of applications that require an adjustable output voltage, as long as the input voltage range, operating temperature range, and current requirements are within the specifications of the part. The integrated fault protection features make it an ideal choice for applications that require robust protection against damaging conditions. The combination of voltage-mode and current-mode control gives it excellent line/load transient performance and efficiency.

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