LP5526 Datasheet, PDF (1/39 Pages) National Semiconductor (TI) – Lighting Management Unit with High Voltage Boost Converter with up to 150mA Serial FLASH LED Driver

LP5526
www.ti.com
SNVS431C – FEBRUARY 2006 – REVISED JULY 2009
LP5526 Lighting Management Unit with High Voltage Boost Converter with up to 150mA
Serial FLASH LED Driver
Check for Samples: LP5526
FEATURES
1
•2 High efficiency boost converter with
programmable output voltage up to 20V
• 2 individual drivers for serial display backlight
LEDs
• Automatic dimming controller
• Stand alone RGB controller
• Dedicated flash function
• Safety function to avoid prolonged flash
• 3 general purpose IO pins
• 25-bump micro SMD Package: (2.54mm x
2.54mm x 0.6mm)
APPLICATIONS
• Cellular Phones and PDAs
• MP3 Players
• Digital Cameras
DESCRIPTION
LP5526 is a Lighting Management Unit for portable applications. It is used to drive display backlights, keypad
LEDs, RGB LEDs and camera flash LEDs. LP5526 can drive 2 separately connected strings of LEDs with high
voltage boost converter. The RGB driver allows driving either individual color LEDs or RGB LED from separate
supply power, or it can be used to drive series connecter flash LEDs from high voltage boost converter.
The backlight drivers (MAIN and SUB pins) are both high resolution constant current mode drivers. The flash
outputs can drive series connected flash LED with up to 150mA of current. External PWM control can be used for
dimming any selected LED outputs or it can be used to trigger the flash. The flash has also 1-second safety
timer.
The device is controlled through 2-wire low voltage I²C compatible interface that reduces the number of required
connections.
Typical Application
Li-Ion Battery
or Charger
CIN
CVDD
10 PF 100 nF
CVDDA
CVREF
1 PF
100 nF
L1
10 PH
VDD1
VDD2
VDDA
VREF
RRGB
RRT
IRGB
IRT
82 kÖ
VDDIO
MCU
RSDA
CVDDIO
100 nF
SDA
SCL
NRST
VDDIO
D1
SW
FB
IMAX = 150 mA
VOUT = 8V...20 V
COUT
2 x 4.7 uF
MAIN
MAIN BACKLIGHT
0...25 mA/LED
SUB
LP5526
RLED
GLED
GND 1-5
BLED
GPIO[2]
GPIO[1]
GPIO[0]/PWM
SUB BACKLIGHT
0...25 mA/LED
FLASH
0...150 mA
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2006–2009, Texas Instruments Incorporated