LT1111CS8-12#TRPBF

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The LT1111CS8-12#TRPBF is a high performance synchronous buck switching regulator from Linear Technology. It is a DC to DC converter that is capable of delivering a low output voltage from a higher input voltage. With a wide operating frequency range of 0.5MHz up to 1.5MHz and adjustable current limit it is ideal for high-performance applications. The LT1111CS8-12#TRPBF is a simple solution to providing a low voltage, high current output with excellent line and load regulation.

Features

The LT1111CS8-12#TRPBF provides superior performance in different application fields due to its advanced features and specifications. Features include:

• Wide VIN and VOUT range: 2.3 to 6V VIN, 0.6 to 5V VOUT.
• High Efficiency: 95% at 10VIN, 3.3VOUT, 2A.
• Advanced Current Limit: ±6% accuracy with adjustable current limit up to 6A using external parts.
• Output voltage margining: -10mV to +250mV for fine-tuning.
• Small Footprint: 4mm x 6mm Low-profile DFN.
• Internal Soft Start: 500 µs peak current limit adjustable from 500 µs to 100 µs.
• Frequency Sync: Externally syncable up to 1.5 MHz.

Applications

The wide operating frequency range and adjustable current limit makes the LT1111CS8-12#TRPBF ideal for a wide range of applications, including:

• High-Delay network applications.
• Automotive power systems.
• Point-of-Loads in communication and storage devices.
• Multiple-channel battery chargers.
• High-Current Bus Converters.
• High-Current, low-voltage DC/DC Converter.

Working Principle

The LT1111CS8-12#TRPBF utilizes a synchronous buck converter topology to regulate the output voltage. It includes two power switches, an inductor, an output capacitor, and various protection circuits. The operation of the circuit can be divided into two phases: the buck phase and the boost phase.

During the Buck phase, one of the power switches (the high-side switch) is turned on and the other (the low-side switch) is turned off. This causes the inductor to store energy in its magnetic field. The input current is charging the output capacitor through the inductor, and the voltage across the inductor is equal to the output voltage plus the voltage drop across the inductor. At the end of this phase, a current spike is created by the inductor when both switches are turned off at the same time. This current spike is limited to a safe value by the current limit circuit.

During the Boost phase, the low-side switch is turned on, while the high-side switch is turned off. This causes the stored energy in the inductor to be discharged into the output capacitor. At the end of the boost phase, the current in the inductor is zero and the output capacitor is now fully charged.

The buck-boost converter then reverts back to the buck phase, and the cycle repeats itself until the desired output voltage is achieved.

Conclusion

The LT1111CS8-12#TRPBF is an advanced high-performance synchronous buck switching regulator from Linear Technology. It is a DC to DC converter that is capable of providing a low output voltage from a higher input voltage. This device is ideal for high-performance applications, offering wide VIN and VOUT ranges, ultra-high efficiency, advanced current limit, output voltage margining, internal soft-start, and external frequency synchronization. The wide operating range and adjustable current limit make this regulator suitable for many different application fields, including automotive power systems, point-of-loads in communication and storage devices, multiple-channel battery chargers, and high-current bus converters.

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