LP5527

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.

More Application Notes

Title	Size in Kbytes	Date	640){this.height=this.height*640/this.width;this.width=640;}' border="0" alt=" Connection Diagram">
AN-1502: AN-1502 LP5526 Evaluation Kit	2362 Kbytes	12-Mar-07	Download
AN-1632: AN-1632 LP5521TM Evaluation Kit	2062 Kbytes	16-Jan-09	Download
AN-1636: AN-1636 LP5522 Evaluation Kit	1568 Kbytes	13-Jun-07	Download
AN-1636 (Chinese): AN-1636 LP5522 Evaluation Kit	435 Kbytes
AN-1702: AN-1702 LP5524 Evaluation Kit	491 Kbytes	17-Mar-08	Download
AN-1523: AN-1523 LP5521 Power Efficiency Considerations	5526 Kbytes	17-Apr-08	Download
AN-1523 (Chinese): AN-1523 LP5521 Power Efficiency Considerations	334 Kbytes
AN-1562: AN-1562 LP5521 Programming Considerations	761 Kbytes	17-Apr-08	Download
AN-1442: Application Note 1442 Design and Programming Examples for Lighting Management Unit LP5526	749 Kbytes	26-Jan-07	Download
AN-1442 (Chinese): Application Note 1442 Design and Programming Examples for Lighting Management Unit LP5526	638 Kbytes