Features High efficiency boost converter with programmable output voltage 2 individual drivers for serial display backlight LEDs 3 drivers for serial keypad LEDs Automatic dimming controller Stand alone serial keypad LEDs controller 3 general purpose IO pins 25-bump micro SMD Package: (2.54mm x 2.54mm x 0.6mm) Description LP3958 is a Lighting Management Unit for portable applications. It is used to drive display backlight and keypad LEDs. The device can drive 5 separately connected strings of LEDs with high voltage boost converter. The keypad LED driver allows driving LEDs from high voltage boost converter or separate supply voltage.The MAIN and SUB outputs are high resolution current mode drivers. Keypad LED outputs can be used in switch mode and current mode. External PWM control can be used for any selected outputs. The device is controlled through 2-wire low voltage I2C compatible interface that reduces the number of required connections. LP3958 is offered in a tiny 25-bump micro-SMD package. Applications Cellular Phones and PDAs MP3 Players Digital Cameras

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

Datasheets

Title		Size	Date	Other Language
	LP3958 Lighting Management Unit with High Voltage Boost Converter	1095 Kbytes	16-Feb-06

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LP3958TL/NOPB RoHS Status	MICRO SMD	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 468 FARNELL Europe and Asia 250 MOUSER Worldwide 250 NEWARK Americas 250	$1.60 each at 1K+ pcs	reel of 250
LP3958TLX/NOPB RoHS Status	MICRO SMD	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$1.60 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 LP3958.

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 LP3958 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
LP3958TL/NOPB	7.844	MICRO SMD	25	1	260	Detail	N/A	N/A	XYTT I SJHB
LP3958TLX/NOPB	7.844	MICRO SMD	25	1	260	Detail	N/A	N/A	XYTT I SJHB

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 LP3958.

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 LP3958 is located at RoHS Status.

CAD Symbols and Models N/A

Models N/A