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Numéro de référence | AAT1236 | ||
Description | High Efficiency White LED Drivers | ||
Fabricant | Skyworks Solutions | ||
Logo | |||
1 Page
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
22.6kΩ
R2
187kΩ
R3
12.1kΩ
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
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Pages | Pages 22 | ||
Télécharger | [ AAT1236 ] |
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