AS3645A-ZWLT

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AS3645A-ZWLT is an LED driver that falls under the Power Management IC (PMIC) category, designed for driving display backlight and flash applications. It is an ideal solution for Microsoft mobile platforms, including tablets, smart phones, and laptops. It offers a range of regulation options and improved system performance to ensure maximum energy efficiency.

The AS3645A-ZWLT is a power efficient LED driver based on triple output Buck Boost architecture in a compact SC-70, 7-bump micro SMD package. It features up to 5x current matching across LEDs, up to 5x minimum On-Time control, and up to 9-stationary modes. Additionally, it offers a power saving mode, a high precision internal reference, overcurrent protection, and over temperature protection. It is also compliant with the latest GreenPower standards and features high efficiency charging features such as intelligent adaptive charging.

The AS3645A-ZWLT can drive up to 3 flashes or a single display backlight. It is designed for high performance, low power operation and noise minimization, and can achieve up to 90% efficiency when driving a single LED. It offers tight current matching to ensure uniform LED illumination and improved brightness adjustment accuracy. The current matching is enabled by a proprietary current matching algorithm, where output current of each LED is managed to be as close as possible to each other.

The AS3645A-ZWLT has adjustable output current allowing for fine tuning of LED brightness. It supports up to three configurable fixed current levels, up to five minimum On-Time control with up to six brightness levels, and up to nine standby modes. Additionally, it includes built-in support for both PWM and Analog dimming.

The AS3645A-ZWLT is designed for easy system integration, supporting multiple operating conditions and a wide range of electrical performance. It can operate from a wide range input voltage of 2.3V to 14V and can provide up to 8V output voltage. It has a programmable soft-start feature for smooth and efficient turn-on/off of the LEDs, to minimize peak currents. It can operate in combination with external voltage regulators, and it is compliant with Low Voltage Assisted Switching (LVAS) standards.

The AS3645A-ZWLT works with a versatile integrated regulator to ensure maximum power efficiency and longer battery life. It supports an adjustable output voltage of up to 6.5V, and voltage foldback to prevent current overshoots. The built-in adaptive charging controls enable to extend the charge cycles of Ni-MH and Li-Ion batteries. It also features an Integrated battery stack reverse voltage protection, to protect against accidental battery mis-connection or battery failure.

In addition, the AS3645A-ZWLT supports dynamic brightness control and variable color temperature selection. Its integrated digital feedback loop guarantees exceptional accuracy in the LED current regulation and eliminates the need for external current mirrors or sense resisters. The LED driver also features soft shutdown, which safely dims down the LED current before removing power to support smooth LED turn-off.

The AS3645A-ZWLT is an ideal LED driver solution for portable devices such as tablets, smart phones and laptops. It provides energy efficiency and excellent display performance while providing compliance with the latest GreenPower standards. Its precise integrated current regulation eliminates external circuitry, simplifying integration and guaranteeing maximum lifetime of the LED. The AS3645A-ZWLT also offers a wide range of features and system controls that allow for simple and efficient tuning, making it a perfect solution for any application requiring precise and reliable power management.

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