AS3729B-BWLM

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AS3729B-BWLM is a special power management integrated circuit (PMIC). It is available in small SOT-23-6 package. The PMIC includes a DC/DC Converter, two charge pumps, one LDO and a WLED driver. It is designed to support battery powered LED flash applications in mobile phones and portable devices. This PMIC provides the user with full control and flexibility over the LED illumination time and intensity.

The AS3729B-BWLM integrates a single 1.2V to 1.8V step-down DC/DC converter. The converter features an adjustable output voltage and can provide up to 500mA of output current. The device also incorporates two charge pumps optimized to provide a voltage up to 3V (2.2V nominal) to power the flash LED with improved efficiency. The device also includes an adjustable, low-noise LDO for the power management and a monitor for the cell voltage.

The WLED driver of the AS3729B-BWLM is specifically designed to drive the high-current White Light Emitting Diodes (WLEDs). It provides support for up to 8 series-connected WLEDs and provides a short-circuit and over-temperature protection. The device integrates programmable digital drivers for WLED with adjustable brightness and fast switching capabilities and can find applications in portable mobile devices requiring accurate and intense illumination for camera flashes and display backlights.

The AS3729B-BWLM provides the user with full control and flexibility over the LED illumination time and intensity. The WLED current and duration can be designed to achieve desired illumination levels with adjustable duty cycle adjustments and programmable over-temperature protection. The control of the LED current is also achievable through external control signals. This PMIC also provides continuous monitoring of the cell voltage, as well as under voltage, over voltage and over temperature protection. The PMIC also integrates a hardware power on reset output signal, allowing the user to perform very precise off/on LED flash timing.

In conclusion, the AS3729B-BWLM is a highly integrated PMIC with a DC/DC converter, two charge pumps, one LDO, and a WLED driver, designed to provide a cost-effective solution for LED flash applications in mobile phones and portable devices. It offers full control and flexibility over the LED illumination, with adjustable brightness, digital control, and integrated over-temperature protection.

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