Features High current boost DC-DC converter (up to 1A output current) Programmable boost output voltage 370 mA flash LED constant current driver with low tolerance and a safety circuit Synchronization pin for the flash timing Two single-ended audio inputs with gain control Four constant current 15 mA LED drivers with 8-bit programmable brightness control Audio synchronization feature I2C compatible control interface Built-in LED connectivity test to maximize manufacturing yield Small microSMD-30 package (2.5 mm x 3.0 mm x 0.6 mm) Description The LP55271 is a lighting management unit for handheld devices with I2C compatible control interface. The LP55271 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 LP55271 has an integrated 370 mA flash driver with a safety stop feature and 46 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. Applications Camera FLASH, funlight and backlight driving in battery powered devices

Typical Application click for larger image	Block Diagram click for larger image

Datasheets

Title		Size	Date	Other Language
	LP55271 Tiny LED Driver for Camera Flash and 4 LEDs with I2C Programmability, Connectivity Test and Audio Synchronization	828 Kbytes	6-Sep-06

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LP55271TL/NOPB RoHS Status	MICRO SMD	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0 FARNELL Europe and Asia 250 MOUSER Worldwide 500 NEWARK Americas 250	$1.10 each at 1K+ pcs	reel of 250
LP55271TLX/NOPB RoHS Status	MICRO SMD	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$1.10 each at 1K+ pcs	reel of 3000

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LP55271.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LP55271 is located at RoHS Status.

Part Number(s) (NSID)	Weight (milligrams)	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LP55271TL/NOPB	9.069	MICRO SMD	30	1	260	Detail	N/A	N/A	XYTT I D55B
LP55271TLX/NOPB	9.069	MICRO SMD	30	1	260	Detail	N/A	N/A	XYTT I D55B

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LP55271.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LP55271 is located at RoHS Status.

CAD Symbols and Models N/A

Models N/A