LT3496EFE

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The LT3496EFE, released by Linear Technology, is an integrated power management IC (PMIC) specifically designed to drive LEDs in applications such as backlighting, display control, and lighting instrumentation. With its high operating frequency, though it can also be used for general purposes, such as power conversion for post-regulation, active current limiting and loop compensation. The LT3496EFE guarantees exceptional efficiency with the ability to dynamically adjust the switching frequency to the LED string\'s reduced output, resulting in lower noise and minimized switching losses. It also provides fully integrated power conversion, allowing for the design of cost-effective, thermally robust, and efficient LED drivers.

LT3496EFE is a 1.2MHz Constant-Frequency, Constant-Switching-Frequency, Inductor-Based LED Driver with low operating current of under 10µA in BOOST Mode, and under 2µA in PFM Mode. Its wide input voltage range of 3.7V to 30V makes it suitable for a variety of applications. It also supports a wide variety of LED loads, from one to ten LEDs in series with a range of forward voltages from 3V to 40V. This flexibility allows for the LED current to be adjusted from 1mA up to 500mA.

The LT3496EFE has an array of features that facilitate improved performance and robustness of LED-driven systems. It includes overvoltage protection circuitry in order to prevent overcurrent and short-circuit conditions, as well as built-in programmable thermal protection to ensure system safety. It supports a wide range of output voltages, up to 30V, and includes a dedicated MODE pin that can be used to enable constant current or constant voltage mode. It also supports COMBINE and GRADATION Voltage Level shift, which allows for the dimming and color-temperature control of white LEDs.

The LT3496EFE\'s advanced converter and protection circuits enable improved system performance and robustness in applications including industrial lighting, automotive lighting, and consumer electronics. With its wide input voltage range, high efficiency, and excellent performance, the LT3496EFE is an ideal choice for LED driver applications.

The LT3496EFE is based on the boost topology. An external N-channel MOSFET is used for power switch with the input voltage, output voltage, & inductor determining the respective duty cycle. The dedicated MODE pin can be set in either continuous or pulse frequency modulation mode depending on the application. In continuous mode, an external resistor can also be used to program the regulation current.

The internal operational transconductance amplifier (OTA) acts as the pulse-width-modulation (PWM) controller. For voltage mode control, the output voltage is sensed and compared to an internal 0.8V reference. Efficiency is improved by changing the oscillator\'s operating frequency based on the current LED output level. This reduces switching losses and the need to control LED current via LED series resistors.

The LT3496EFE also includes an internal temperature-sensing circuit to protect the device from high internal temperatures. The thermal protection disables the output voltage and keeps it disabled until the die temperature cools down to a safe operating level. Additionally, it also has an over-current protection with a threshold of about 700mA and a foldback current limit to minimize the output current under fault conditions.

In summary, the LT3496EFE PMIC-LED Driver is an efficient and powerful IC that provides robust performance, reliability, and energy efficiency in a wide variety of LED driver applications. Its low operating current, wide input voltage range, and excellent thermal characteristics make it a great option for cost-effective, thermally robust, and efficient LED drivers. Its COMBINE and GRADATION Voltage Level shift allow for dimming and color-temperature control, making it a reliable and versatile solution for efficient LED driver design.

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