LT3501IFE#PBF

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LT3501IFE#PBF Application Field and Working Principle

Introduction

LT3501IFE#PBF is a monolithic, 4A unidirectional synchronous buck switching regulator from Linear Technology. It combines two internal MOSFETs and all the control circuitry necessary to regulate an input voltage as low as 3V down to 0.8V at up to 4A load. This integrated regulator can be operated in either pulse-width-modulated (PWM) or phase shifted mode for low noise operation and is capable of achieving high efficiency. It offers separate control for adjustment of the switching frequency and voltage regulation. Its built in OVP is useful in fault conditions. LT3501IFE#PBF is part of the linear’s monolithic switching regulator family which provides an extensive range of products with various core voltage, output voltage ranges, and feature sets designed to address a wide array of design needs.

Application Field

LT3501IFE#PBF is ideally suited to battery powered applications as well as automotive, avionics system and where long life safety is of paramount importance. This DC/DC converter can be used in a variety of systems such as notebook computers, portable electronic devices, automotive audio systems, medical instrumentation and more. It is especially useful for applications with input voltages that are too low for Linear’s standard linear regulators. The device features an on-board low-side output current sensing for high precision voltage regulation and power control.

Working Principle

LT3501IFE#PBF is a unidirectional synchronous buck switching regulator. It consists of two high-speed MOSFETs and a control circuitry integrated into a single package. The internal MOSFETs are used to convert the input voltage to the output voltage. When the MOSFETs are turned on, current will flow from the input voltage to the output. The MOSFETs are controlled by an internal feedback circuit, which senses the output voltage and controls the duty cycle of the MOSFETs so that the output voltage is regulated. To protect the device from short-circuiting, a short circuit protection circuit is also included to limit the maximum current in the load. The device also includes an Output Voltage Adjust (OVP) circuit to prevent over-voltage conditions and over-temperature protection to provide system safety in case of fault conditions.

Benefits

LT3501IFE#PBF provides many benefits over standard linear regulators, such as higher efficiency, smaller size, as well as higher power handling capability. Its high-efficiency operation eliminates the need of bulky and costly output inductors or transformers. The device can also be run at a wide variety of frequencies and at faster switching speeds than traditional linear regulators, allowing increased design flexibility. In addition, its low-side current sensing allows very precise output voltage regulation, making it an ideal choice for applications with restrictive power budgets. Finally, its built-in protection features ensure system safety and reliability in the face of extreme conditions.

Conclusion

The LT3501IFE#PBF synchronous buck switching regulator from Linear Technology combines the efficiency and power handling capabilities of a DC/DC regulator with the flexibility and safety features of a linear regulator. It is suitable for a variety of power supply applications, including notebook and portable electronics, automotive audio, medical instrumentation and more. Its high-efficiency operation eliminates the need of bulky output inductors and its low-side current sensing allows precise output voltage regulation.

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