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LP5527TL Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LP5527TL Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 21 page  LP5527 Tiny LED Driver for Camera Flash and 4 LEDs with I 2C Programmability, Connectivity Test and Audio Synchronization General Description The LP5527 is a lighting management unit for handheld devices with I 2C 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 cam- era flash LED. In addition the DC/DC converter has the output current to power for example an audio amplifier si- multaneously. 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 inter- face 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. Features n High current boost DC-DC converter (up to 1A output current) n Programmable boost output voltage n 400 mA flash LED constant current driver with low tolerance and a safety circuit n Synchronization pin for the flash timing n Two single-ended audio inputs with gain control n Four constant current 15 mA LED drivers with 8-bit programmable brightness control n Audio synchronization feature n I 2C compatible control interface n Built-in LED connectivity test to maximize manufacturing yield n Small microSMD-30 package (2.5 mm x 3.0 mm x 0.6 mm) Applications n Camera FLASH, funlight and backlight driving in battery powered devices Typical Application 20184001 May 2006 © 2006 National Semiconductor Corporation DS201840 www.national.com |
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