LED driver flashes for cameras

Rohm has an integrated LED driver combining the ability to drive red, green, blue and white LED outputs with a mode that provides a high brightness ‘flash’ LED output.

The BH6048KN rainbow LED driver is a single-chip for managing multiple LEDs in mobile phone applications. In addition, the built-in flash mode allows designers to use LEDs to provide flash illumination for pictures taken with the mobile phone camera.

The IC incorporates a high-efficiency, high current output PWM DC/DC converter and a three-channel current driver that supports red, green, blue and white LEDs. Current settings for LED illumination functions can be configured to between 1.25mA and 23.0mA in increments of approximately 1.4mA. For flash driver output, current settings can be set between 75mA and 150mA in 25mA steps.

Typical supply voltage for the device is specified as 3.0 to 4.5V. A two-wire serial I²C interface supports FAST mode and facilitates connection to a host controller.

Supplied in a QFN 28-pin package, the BH6048KN has dimensions of 5.2×5.2×0.8mm. For applications where saving board space is the overriding design criteria, a BGA version of the device (known as the BH6048GU) with a footprint of only 3.0mm² requires 30 per cent of the board space of the QFN.

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