Tiny LED Driver For Camera Flash And 4 LEDs With I2C Programmability, Connectivity Test And Audio Synchronization
The LP5527 is a lighting management unit for handheld devices with I2C compatible control Interface The LP5527 has a Step-up DC/DC converter with high current output and it drives Display and keypad backlights and powers the camera Flash LED In addition the DC/DC converter has the output current to power for example an Audio Amplifier simultaneously. The chip has four 8-bit programmable high efficiency constant current LED Drivers and a Flash LED Driver Built-in Audio synchronization feature allows the user to synchronize one of the LEDs to Audio input.
The LP5527 has an integrated 400 mA Flash driver with a safety stop feature and 50 mA torch mode. An external enable pin is provided for the synchronizing the Flash with the camera action. An external software independent test Interface provides a fast way to find a broken path or short on LED circuits. Very small microSMD package together with minimum number of external components is a best fit for handheld devices.
By National Semiconductor Corporation
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