LTC1503IS8-1.8#TRPBF

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PMIC - Voltage Regulators - DC DC Switching Regulators

Linear Technology Corporation’s LTC1503IS8-1.8#TRPBF is a synchronous low-EMI DC/DC buck regulator. It features a gate drive pin which is used to control the internal MOSFET, allowing the user to determine the switching frequency. This component is often employed in situations such as LVDS applications, forward converter designs, or in any application that requires a higher frequency of operation. This component is ideally suited for applications with audio frequency of up to 1MHz and beyond.

The device is available in an 8-pin metric SSOP package, which allows for a very low profile. It also comes with a built-in temperature monitor which provides an early warning against thermal runaway conditions. The component is also specified over a temperature range of -40°C to 85°C.

The device features several different types of protection features which include under-voltage lockout, current limit, programmable soft-start, and thermal shutdown. This makes the component suitable for applications that require both over-current and under-voltage protection. The component also comes with an integrated control loop which ensures that the voltage output is regulated to the predetermined values.

Working Principle

The working of this buck regulator can be easily understood by examining the simplified block diagram given below.

This buck regulator employs a synchronous switch mode control technique. It utilizes an internal control loop which adjusts the duty cycle of the internal MOSFET to regulate the output voltage. The control loop consist of the voltage reference and error amplifier which proportionally adjusts the duty cycle of the internal MOSFET to obtain the desired output voltage.

The output voltage of the device is adjusted by varying the frequency of the gate drive pin. At higher frequencies, the internal MOSFET switching losses are reduced which leads to improved power efficiency. However, the device cannot be operated beyond a certain frequency beyond which the switching losses become excessive.

The device also includes protection module which safeguards the device from various conditions. These include under-voltage lockout, current limit, programmable soft-start, and thermal shutdown. This safeguards the device from various operating conditions.

Application Field

The LTC1503IS8-1.8#TRPBF is much suited for applications involving audio frequencies up to 1MHz and beyond. It is also ideal for LVDS applications and forward converter designs.

The device is also well suited for industrial applications such as in data acquisition and control systems, machine vision, robotics, automated test systems, and process control equipment. It can also be used in automotive systems, GPS navigation systems and other consumer electronics.

Conclusion

In conclusion, the LTC1503IS8-1.8#TRPBF is an efficient synchronous low-EMI DC/DC buck regulator. It is ideally suited for applications with audio frequencies of up to 1 MHz and beyond and is also well-suited for industrial and consumer applications. The device comes with several protection features which make it suitable for applications requiring over-current and under-voltage protection.

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