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參數(shù)資料
| 型號： | AAT1236 |
| 廠商： | Advanced Analog Technology,lnc. |
| 元件分類： | LED驅(qū)動器 |
| 英文描述： | High Efficiency White LED Drivers for Backlight and Keypad |
| 中文描述： | 高效率白光LED的背光和鍵盤驅(qū)動程序 |
| 文件頁數(shù)： | 1/24頁 |
| 文件大?。?/td> | 1009K |
| 代理商： | AAT1236 |
AAT1236
High Efficiency White LED Drivers
for Backlight and Keypad
1236.2007.02.1.1
1
SwitchReg
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 converter which steps up the single cell lithi-
um-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 tran-
sients and allows the use of small external compo-
nents. A fully integrated control circuit simplifies the
design and reduces total solution size.
A two-wire I
2
C serial digital interface is used to indi-
vidually turn each output sink on/off and adjust the
LED current by group. Unlike conventional pulse
width modulation (PWM) control of LED brightness,
the AAT1236 drives the LEDs with constant, non-
pulsating current. The interface is fully compliant to
the Fast/Standard mode I
2
C specification, allowing a
transfer rate of up to 400kHz.
A similar device is also available with a proprietary
Advanced Simple Serial Control (AS
2
Cwire) sin-
gle 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 operation over the -40°C to +85°C tem-
perature range.
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, I
2
C 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
Typical Application
EN
AGND
VIN
L=2.2μH
D1
C
2.2μF
IN
C
2.2μF
R2
187k
Ω
R3
12.1k
Ω
R1
22.6k
Ω
OUT
Input :
2.7V~5.5V
AAT1236
SW
B1
Up to 24V max
GND
RSET
B2
A1
A2
A3
Enable
OV
Backlight
LEDs
Keypad or
RGB LEDs
LIN
IN
SDA
SCL
SDA SCL
I
2
C
Interface
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AAT1236IRN-T1 | 制造商:Skyworks Solutions Inc 功能描述:24V 100MASTEPUP CONVERTER TDFN34 TR 制造商:Skyworks Solutions Inc 功能描述:DC TO DC CONVERTER |
| AAT1239-1 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:40V Step-Up Converter for 4 to 10 White LEDs |
| AAT1239-1_08 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:40V Step-Up Converter for 4 to 10 White LEDs |
| AAT1239-1_0810 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:40V Step-Up Converter for 4 to 10 White LEDs |
| AAT1239ITP-1 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:40V Step-Up Converter for 4 to 10 White LEDs |
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