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PMIC - Voltage Regulators - DC DC Switching Regulators

The LT1938EDD#TRPBF is a DC-DC switching regulator featured by Linear Technology. This voltage regulator uses a switching MOSFET and an internal error amplifier to regulate output voltage over a wide input voltage range. It can handle up to 5A of output current and operates from an input voltage of 3V up to 36V. The LT1938EDD#TRPBF can generate a voltage from 1.235V to 28V.

Features

• Input voltage range of 3V to 36V
• Output voltage range of 1.235V to 28V
• Up to 5A output current
• Low Profile (1.5mm maximum height) Thermally EnhancedQFN package
• High efficiency
• Wide 2MHz switching frequency range
• Parallel operation up to 300A
• Reference adjustable over a wide range
• Integrated power MOSFET switch
• Internal reference voltage
• -40 to 85 degree Celsius Ambient Temperature Range

Application Areas

The LT1938EDD#TRPBF is widely used in many applications including consumer electronics, medical, industrial and light automotive applications. It can be used in a wide range of applications such as high current power supplies, distributed power systems, point-of-load regulators, and battery management systems.

The combination of high efficiency and wide input voltage range makes the LT1938EDD#TRPBF ideal for automotive, industrial, and communication systems requiring high power density and low power dissipation. Its small form factor and high current capability make it well suited for portable and embedded application designs.

Working Principle

The LT1938EDD#TRPBF is ideally suited for step-down, step-up, and conformal-regulation of volts. Through using a single-ended flying capacitor topology, the device integrates the converter and requires relatively few external components. The operating principle is based on switches allowing the current to be switched from one side of the switch to the other.

The switching device is a low-side MOSFET whose duty cycle is controlled by an inner loop voltage feedback control system. The system works by comparing the regulator feedback voltage to an adjustable reference voltage. The difference between the two is then amplified and used to adjust the duty cycle. This system is designed to assure a predictable and accurate output voltage.

Conclusion

The LT1938EDD#TRPBF is a DC-DC switching regulator with features that make it ideal for use in a variety of applications. This voltage regulator offers a wide input voltage range, up to 5A of output current, and high efficiency. It is well suited for applications such as high current power supplies, distributed power systems, point-of-load regulators, and battery management systems. Its small form factor and high current capability make it an ideal choice for embedded applications. By using the inner loop voltage feedback control, the output voltage is accurately regulated.

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