DataSheetWiki


AAT1236 fiches techniques PDF

Skyworks Solutions - High Efficiency White LED Drivers

Numéro de référence AAT1236
Description High Efficiency White LED Drivers
Fabricant Skyworks Solutions 
Logo Skyworks Solutions 





1 Page

No Preview Available !





AAT1236 fiche technique
DATA SHEET
AAT1236
High Efficiency White LED Drivers for Backlight and Keypad
General Description
The AAT1236 is a highly integrated, high efficiency power
solution for white LED and keypad backlights in mobile/
portable devices. It is based on a switching boost con-
verter which steps up the single cell lithium-ion/polymer
battery voltage to drive 5 strings of series-connected
white LEDs with precision current regulation. The AAT1236
is capable of driving a total of four LEDs per channel.
The boost converter can produce an output drive of up
to 24V at 100mA. The high switching frequency (up to
2MHz) provides fast response to load transients and
allows the use of small external components. A fully
integrated control circuit simplifies the design and reduc-
es total solution size.
A two-wire I2C serial digital interface is used to individu-
ally turn each output sink on/off and adjust the LED cur-
rent by group. Unlike conventional pulse width modula-
tion (PWM) control of LED brightness, the AAT1236 drives
the LEDs with constant, non-pulsating current. The inter-
face is fully compliant to the Fast/Standard mode I2C
specification, allowing a transfer rate of up to 400kHz.
A similar device is also available with a proprietary
Advanced Simple Serial Control™ (AS2Cwire™) single
wire interface; please see the AAT1235 datasheet.
The AAT1236 is available in a Pb-free, thermally-enhanced
16-pin 3x4mm TDFN package and is specified for opera-
tion over the -40°C to +85°C temperature range.
Typical Application
L=2.2µH
D1
Features
Input Supply Voltage Range: 2.7V to 5.5V
Maximum Boost Output Drive: Up to 24V at 100mA
Up to 85% Efficient Operation
Up to 2MHz Switching Frequency with Small Inductor
User-Programmable Full-Scale LED Current, Up to
30mA
Two-Wire, I2C Compliant Serial Interface
Two Addressable Registers
• Independent LED Current Control by Group
Backlight Group B1-B2, 16 Settings
Auxiliary Group A1-A3, 16 Settings
• Independent LED ON/OFF Control
Fast, 400kHz Serial Transfer Rate
Non-Pulsating, High-Performance LED Current Drive
for Uniform Illumination
10% Absolute Accuracy
2% Channel-to-Channel Matching
Over-Voltage and Over-Temperature Protection
Automatic Soft-Start Minimizes Large Inrush Current
at Startup
Available in 3x4mm TDFN34-16 Package
Applications
Digital Still Cameras (DSCs)
Keypad Backlight
Large Panel Displays
Mobile Handsets
PDAs and Notebook PCs
Personal Media Players
White LED Backlight
Up to 24V max
Keypad or
RGB LEDs
COUT
2.2µF
Input :
2.7V~5.5V
CIN
2.2µF
LIN
VIN
IN
Enable
I2C
Interface
SDA
SCL
Backlight
LEDs
SW B 1 B 2 A 1 A 2 A 3
AAT1236
OV
EN SDA SCL
RSET GND AGND
R1
22.6k
R2
187k
R3
12.1k
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202111A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 27, 2012
1

PagesPages 22
Télécharger [ AAT1236 ]


Fiche technique recommandé

No Description détaillée Fabricant
AAT1230 Step-Up Converter AAT
AAT
AAT1230-1 18V 100mA Step-Up Converter Advanced Analogic Technologies
Advanced Analogic Technologies
AAT1231 Step-Up DC/DC Converter AAT
AAT
AAT1231-1 Step-Up DC/DC Converter AAT
AAT

US18650VTC5A

Lithium-Ion Battery

Sony
Sony
TSPC106

PCI Bus Bridge Memory Controller

ATMEL
ATMEL
TP9380

NPN SILICON RF POWER TRANSISTOR

Advanced Semiconductor
Advanced Semiconductor


www.DataSheetWiki.com    |   2020   |   Contactez-nous  |   Recherche