AS1109-BQFR

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Power management integrated circuits (PMIC) are technology that plays an increasingly important role in the design and operation of modern mobile devices. One type of PMIC, LED drivers, is capable of providing precise current, either static or pulsed, to light-emitting diodes (LEDs). The AS1109-BQFR is a LED driver used for driving LEDs in mobile devices with a recommended power supply voltage from 2.7V to 5.5V.

Overview

The AS1109-BQFR is used for driving LEDs in mobile devices. This device has low voltage operation, wide input voltage range, and adjustable current to supply power to the LED. It provides high accuracy current regulation while the transistor-transistor logic (TTL) increases communication speed. Moreover, the chip employs a current mode control system to increase reliability and provides a low dropout voltage operation at steady state.

Application Field

The AS1109-BQFR is mainly used in mobile applications such as digital cameras, mobile phones, tablets and embedded systems.

Advantages

The advantages of using the AS1109-BQFR for mobile device LED applications are as follows:

• Low voltage operation.
• Wide input voltage range.
• High accuracy current regulation.
• TTL increases communication speed.
• Current mode control system increases reliability.
• Low dropout voltage operation at steady state.

Working Principle

The AS1109-BQFR operates using current mode control. This kind of power management control technique enables the device to provide a level of precision when dealing with current input and output. Furthermore, it maintains a stable output voltage even with varying input voltage conditions. Due to its stable operating ability, the device will not enter saturation and this ensures its optimal performance when driving LEDs.

In addition, the driver is equipped with several protections. Under-voltage lockout (UVLO) is used to protect the device from voltage input that is below the recommended operating voltage. Overload protection (OLP) is installed to ensure that the device is not over-loaded during operation. Short-circuit protection (SCP) prevents the driver from damaging if a short-circuit situation occurs. Thermal shutdown (TSD) will be activated when the output power reaches a certain temperature.

Moreover, the device can be easily programed with a few clicks. A clock phase is provided for the programming state. Formatting data and a reset signal can be used to either freeze or reset the values of the register. Furthermore, the device contains a supply voltage pins (V_DD) for powering other components of the circuit.

Conclusion

The AS1109-BQFR is a PMIC demonstrative of how technology is advancing towards comprehensive solutions for mobile device LED applications. Starting from the low voltage operation, wide input voltage range, high accuracy current regulation, and adjusting speed information with the TTL interface, the device shows a level of sophistication and efficiency never seen before for LED drivers. The AS1109-BQFR is there to provide a stable, reliable, and efficient power delivery to all mobile device LED applications.

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