LT3598IFE

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LT3598IFE is an integrated high current step up converter intended for generating high current drive currents required by high power LEDs operating in a single cell Li-ion battery powered environment. It offers an array of features that makes it an ideal choice for applications such as flash illumination or illumination in harsh or changing lighting environments. This article describes the application field and working principle of the LT3598IFE.

Application Field and Possibilities

The LT3598IFE is well-suited for high power LED applications that require high current drive currents, such as automotive and commercial lighting. The integrated current sense and integrated LED current adjustment enables precision brightness control and fault protection. The low quiescent current of the LT3598IFE makes it an ideal solution for battery powered systems. The device also features a wide operating voltage input range, up to 36V, which allows it to provide power from a single cell Li-ion battery. Additionally, the low dropout voltage feature of the LT3598IFE provides improved efficiency and extended battery life.

Moreover, the LT3598IFE features pulse-frequency modulation (PFM) mode and constant frequency mode (CFM) that enables efficient operation. In PFM mode, the duty cycle is adjusted to keep the output voltage constant while minimizing the average current consumed. CFM mode is a fixed frequency/fixed duty cycle modulator that keeps the output voltage constant while providing accurate mean input current regulation over the entire operating range.

Internal Structure and Working Principle

The LT3598IFE consists of an N-channel MOSFET, a voltage feedback loop, an external current sense, and an internal voltage comparator. A voltage divider network is used to measure the output voltage. The voltage divider network then compares the output voltage to the internal voltage reference to control the converter’s output voltage. When the output voltage is higher than the reference voltage, the converter’s internal circuits will reduce the output voltage to the reference level.

The LT3598IFE also contains a current-sense circuit that monitors the output current. The current sense circuit, which is connected in series with the output, measures the current flowing through the converter and is used to modulate the duty cycle, depending on the load current. In PFM mode, the duty cycle increases when the load current decreases, and decreases when the load current increases. This allows the LT3598IFE to maintain the output voltage while minimizing the average current consumed.

The LT3598IFE also features a constant voltage/constant current (CV/CC) output current adjustment feature. The output current is adjusted with an external variable resistor, which is used to control the voltage on the current sense pin of the device. A hysteretic PFM/CFM mode selection circuit allows the user to select the operating mode of the device. A wide operating temperature range allows the LT3598IFE to be used in harsh and changing lighting environments.

Conclusion

The LT3598IFE is a high power step-up converter and ideal for high current LED applications that require precise brightness control, fault protection, and extended battery life. It features PFM and CFM modes that enable efficient operation, a wide operating voltage range, a low dropout voltage for improved efficiency, and variable current adjustment. The device is well-suited for a variety of applications, including automotive and commercial lighting, flash illumination, and harsh or changing lighting environments. With its array of features and possibilities, the LT3598IFE is an excellent choice for LED applications.

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