Austriamicrosystems AG has introduced the power management IC "AS3676" for LED lighting on portable products. The power supply voltage range is +3.0 to 5.5V, and is mainly for portable products driven by a single unit of lithium ion and lithium polymer rechargeable batteries or three units of nickel-metal hydride rechargeable batteries.
As a power supply circuit for LED driving, a step-up DC-DC converter, a charge pump circuit, and a sink current source are integrated. The step-up DC-DC converter is mainly used to drive white LEDs used in liquid crystal panel backlights. The output voltage is up to +25V and the output current is up to 50mA. The conversion efficiency is about 85%. The role of the charge pump circuit is to power the inrush current source. The boost ratio is switched according to the magnitude of the input voltage. It can be selected from 1x, 1.5x and 2x. The output current is up to 500mA.
Austrian Microelectronics has prepared 13 intrusive current sources. In addition to being used for driving red, green, and blue LEDs, these current sources can also be used to drive white LEDs for backlights, alarms, and oscillators. Among them, there are three current sources with an output voltage of at most +26V and an output current of up to 38.25A. There are 10 current sources with an output voltage of up to 5.5V and an output current of up to 38.25A. The output current of each current source can be set by a digital signal with an 8-bit resolution.
Power management IC for LED lighting for portable products
AS3676 has a "DLS (dynamic luminance scaling)" function that uses the illuminance sensor to detect the surrounding brightness and adjust the brightness of the LED to synchronize the circuit that generates the LED illumination pattern, the PWM signal generator for dimming, and the audio signal to drive red and green. And the function of the blue LED. In addition, a 10-bit AD converter that converts input signals from illuminance sensors and temperature sensors into numerical values, and an LDO regulator with an output voltage range of +1.8 to 3.35V and an output current of up to 150mA are integrated.
The AS3676 is equipped with a two-wire serial interface. Use this interface to set various parameters. The operating temperature range is -30 to +85 °C. The package uses a 30-terminal WLCSP with a mounting area of ​​3.0mm x 2.5mm. The unit price for 1000 batch purchases is $2.40.
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