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Flash LED Drivers from Diodes Incorporated Deliver High-Current Stability in Portable Devices for Dual- and Quad-Channel Applications
The AL3644 employs a constant-frequency, synchronous-boost, current-mode PWM converter to deliver up to 1.5A for each of the two constant current sources across its 2.5V to 5V input voltage range. The I2C-compatible interface, operating at up to 400kHz, is used to configure the device to deliver a constant current at one of 128 levels between 1.4mA and 1.5A. The ratio between the two outputs is also adjustable through the I2C-compatible interface.
With the increasing trend towards portable and wearable devices that offer sophisticated camera functionality, including video, along with the convenience of a torch, the demand for highly flexible LED drivers is increasing. The AL3644 meets this need by offering dual, parallel current sources at efficiencies over 85% in both torch mode and flash mode.
Two switching-frequency options, 2MHz and 4MHz, are provided, giving engineers greater flexibility while simplifying the overall design. The higher switching frequency also allows smaller passive components to be used, such as low-profile inductors and small 10μF ceramic capacitors, reducing the overall bill of materials.
As well as being the first LED driver from
The AL3644 and AL3644TT (signifying different device identification addresses) are available in low torch current and high torch current variants in a U-WLB1713-12 package measuring 1.75mm × 1.35mm.
Further information is available at www.diodes.com.
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