AAT3192IJQ-1-T1 Integrated Circuits (ICs)

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PMIC - LED Drivers are used to convert power signals into controlled, precise output signals for the purpose of powering LED lights. The PMIC - LED Driver AAT3192IJQ-1-T1 is an advanced environment-friendly LED backlighting driver, designed to provide a high efficiency and low noise solution for LED backlighting. It features 2A of maximum constant current regulation and can be operated from 2.7V to 5.25V. The typical LED backlight application circuit is presented in Figure 1.

The AAT3192IJQ-1-T1 LED driver operates in a self-oscillating pulse frequency modulation (PFM) mode. This mode requires a minimum number of external components, making it easy and cost effective to implement. The constant current regulation is accomplished through the current sense comparator with an internal reference voltage of 0.6V which compares VOUT voltage to an external current-sense resistor connected to the VREF pin.

The AAT3192IJQ-1-T1 is designed to drive up to two strings of LEDs with maximum constant current of 1000mA providing a high level of system design flexibility. The AAT3192IJQ-1-T1 is an excellent choice for a wide variety of low power LED applications such as smartphone, tablet, notebook and TV backlighting.

The AAT3192IJQ-1-T1 includes several features that make it suitable for LED applications, such as EN pull-up and a high-power output stage offering up to 2A of output current. A low off-mode power consumption of 0.8mW allows the LED backlight to be used in handheld applications where battery life is critical. The device also supports an adjustable shutdown current of 0-100uA with an external resistor.

The AAT3192IJQ-1-T1 LED driver can also detect a short on one of the LED strings and turn off the device without the need for a resistor-divider network. This feature allows the LED string connected to the VOUT pin to remain kept powered during the overrun cycle. On-time monitoring and thermal shut-down are also included, providing protection against accidental prolonged overload.

To improve overall efficiency, the device includes a self-oscillating PFM control scheme, which only keeps the output voltage when required and switches to PWM (pulse width modulation) mode during high output currents to reduce switching losses. This can lead to improved efficiency at light and medium load current levels.

The AAT3192IJQ-1-T1 LED driver is a highly integrated, end-to-end system solution designed to address low power LED applications such as smartphone, tablet, notebook and TV back lighting. With its advanced integration, low power consumption and high efficiency, the AAT3192IJQ-1-T1 is the ideal choice for cost effective, low power, and space saving LED products.

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