LT1109ACS8-5#TRPBF

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Introduction

LT1109ACS8-5#TRPBF is a monolithic DC-DC converter switch regulator from Linear Technology and is specially designed for backlighting, display illumination and other power applications from a single source. As part of the PMIC -- Voltage Regulator – DC DC Switching Regulator category, it provides excellent regulation performance and meets all the power needs of LCD displays.

Application Field and Working Principle

The LT1109ACS8-5#TRPBF DC-DC converter switch comes with a boost topology that allows it to produce output voltages higher than the battery. This allows it to dynamically adjust the LED backlight brightness level while still operating efficiently. It can also be used to power a 9 to 30V LED array directly from the 3.3V battery.

The LT1109ACS8-5#TRPBF also features a three-pin voltage preset terminal and two selectable frequency modes which together allows the user to easily adjust the output voltage as per the desired brightness. Moreover, the internal low-side ceramic capacitor eliminates the need for an external ceramic output capacitor. This feature allows for a more efficient design and eliminates the risk from capacitive discharge.

LT1109ACS8-5#TRPBF features a current limited PCIe-synchronous buck topology which provides a low minimum output voltage, excellent load and line regulation, wide input voltage range and low-dropout performance. It operates over a wide range of input voltages from 3.3V to 30V. It can offer up to 500mV of regulation at room temperature and over the -40°C to +85°C temperature range. Additionally, the LT1109ACS8-5#TRPBF also features an over-temperature protection, current limit protection and over-voltage protection.

Conclusion

In conclusion, LT1109ACS8-5#TRPBF is an ideal choice for LCD displays looking for a reliable, efficient and easy-to-use DC-DC converter switch regulator. It provides excellent regulation performance, wide input voltage range and low-dropout performance. With its three-pin voltage pre-set terminal and two selectable frequency modes, it is also very easy to adjust the output voltage as desired.

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