LT8391AHFE#PBF

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LT8391AHFE#PBF is a PMIC, or power management integrated circuit, designed by Linear Technology. The #PBF notation implies the device is an automotive grade circuit and is an AEC-Q100 qualified, high-efficiency LED driver. The LT8391AHFE#PBF is an easy to use and efficient LED driver solution containing two independent high-brightness LED (HBLED) drivers. It uses spread spectrum switching to reduce electromagnetic interference (EMI) and offers linear dimming from 0 to 99%. It also provides active in-rush current limiting and adjustable frequency to reduce audible noise. The device is designed for automotive interior lighting, including footwell illumination, climate control illumination, theater lighting, and ambient lighting. The LT8391AHFE#PBF is also suitable for both indoor and outdoor applications.

The LT8391AHFE#PBF is designed to drive two independent HB LEDs from a single source, including single-string series, parallel dual-string and single-cell LED arrays. The device’s main features include 3V to 4.8V input supply voltage, adjustable LED dimming current up to 100mA per channel, and short circuit protection. Its input supply current is just 13µA and it features a maximum junction temperature of 175°C. The device also includes in-rush current limiting, optional spread spectrum clock switch, and logic compatible I2C interface.

The device operates in a buck mode which implies it operates in a continuous conduction mode. The input voltage is transferred to the HBLEDs using two separate inductors and power stages. When the LED dimming is commanded through the I2C interface, the switching frequency is changed and the LED current will decrease linearly relative to the duty cycle. The device also provides efficient and reliable operation over a wide temperature range. Furthermore, the IC has a maximum efficiency of 93%.

The LT8391AHFE#PBF is also designed to provide a simple and easy implementation of in-rush current limiting. The device offers an adjustable current limit which limits the peak current during startup. Furthermore, the device passes the AEC-Q100 EMI testing, assuring superior electromagnetic interference (EMI) levels in tandem with automated spread spectrum clocking to minimize EMI on audio and RF receiver applications. Finally, the device is RoHS-compliant, with its lead-free packaging ensuring 100% solder joint fatigue tests at 2x reflow cycles.

In conclusion, the LT8391AHFE#PBF has been designed as a convenient and efficient LED driver solution from Linear Technology. It provides in-rush current limitation, adjustable frequency spread spectrum switching, and operates in a continuous conduction mode, ensuring an unrivalled efficiency of up to 93%. The device is automotive grade, AEC-Q100 qualified and suitable for a number of lighting applications. It is easy to use and reliable, providing flexibility and reliability with its wide input voltage range and overload protection.

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