LP3936 Datasheet, PDF (1/30 Pages) National Semiconductor (TI) – Lighting Management System for Six White LEDs and One RGB or FLASH LED

LP3936
www.ti.com
SNVS259D – NOVEMBER 2003 – REVISED MAY 2013
LP3936 Lighting Management System for Six White LEDs and One RGB or FLASH LED
Check for Samples: LP3936
FEATURES
1
•2 High Efficiency 250 mA Magnetic Boost DC-DC
Converter with Programmable Output Voltage
• PWM controlled RGB LED drivers with
programmable color, brightness, turn on/off
slopes and blinking
• FLASH function with 3 drivers, each up to 120
mA current
• 4 constant current White LED drivers with
programmable 8-bit adjustment
(0 … 25 mA/LED)
• 2 constant current White LED drivers with
programmable 8-bit adjustment
(0 … 25 mA/LED)
• 8-bit ADC for ambient light sensor with
averaging
• Combined MicroWire/SPI and I²C compatible
serial interface
• Low current Standby mode (software
controlled)
• Low voltage digital interface down to 1.8V
• Space efficient 32-pin TLGA laminate package
APPLICATIONS
• Cellular Phones
• PDAs
DESCRIPTION
LP3936 is a complete lighting management system
designed for portable wireless applications. It
contains a boost DC/DC converter, 4 white LED
drivers to drive the main LCD panel backlight, 2 white
LED drivers for sub-LCD panel and 1 set of RGB
LED drivers.
Both WLED groups have 8-bit programmable
constant current drivers that are separately adjustable
and matched to 1% (typ.). For efficient backlighting
the backlight intensity can be adjusted using the 8-bit
ADC with ambient light detection circuit.
The RGB LED drivers are PWM-driven with
programmable color, intensity and blinking patterns.
In addition, they feature a FLASH function to support
picture taking with camera-enabled cellular phones.
Typical Application
Li-Ion Battery
or Charger
V_IN
+
C_IN
10 PF
4
Baseband
Processor
or
Microcontroller
Optical
sensor
V_DD
L1
10 PH
OUT
I2C or
MicroWire/
SPI Interface
MW_SEL
RGB_EN
NRST
V_{DD_IO}
LP3936
AIN
AREF
GND
D1
FB
WLED1
WLED2
WLED3
WLED4
WLED5
WLED6
I_MAX = 250 mA
V_OUT =
4.1 - 5.3V
C_OUT
10 PF
Main Display
Backlight
0 - 25 mA
per LED
Sub Display
Backlight
0 - 25 mA
per LED
ROUT
GOUT
BOUT
RGB
120 mA
max. per
LED
1
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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 © 2003–2013, Texas Instruments Incorporated