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參數(shù)資料
| 型號(hào)： | AAT2845A |
| 廠商： | Advanced Analogic Technologies, Inc. |
| 英文描述： | Four-Channel Backlight Driver with Dual LDOs |
| 中文描述： | 四通道雙LDO的背光驅(qū)動(dòng)器 |
| 文件頁數(shù)： | 1/19頁 |
| 文件大小： | 451K |
| 代理商： | AAT2845A |
AAT2845A
Four-Channel Backlight Driver with Dual LDOs
2845A.2007.05.1.0
1
ChargePump
General Description
The AAT2845A is a highly integrated power solu-
tion for single-cell lithium-ion-based LCD display
applications. It includes a four-channel LED back-
light driver and two integrated 200mA LDOs as
additional power supplies for display and camera-
related chipsets.
The backlight driver is a low noise, constant fre-
quency charge pump DC/DC converter that uses a
tri-mode load switch (1X), fractional (1.5X), and
doubling (2X) conversion to maximize efficiency.
Each of the four channels is capable of driving up
to 20mA per channel.
AnalogicTech's S
2
Cwire (Simple Serial Control)
serial digital input is used to enable, disable, and
set current for each LED with 16 available settings
down to 50μA. The low current mode supply current
can be as low as 50μA to save power and maintain
high efficiency.
Each LED output is equipped with built-in protec-
tion for short-circuit and auto-disable functions.
Built-in soft-start circuitry prevents excessive
inrush current during start-up. A low current shut-
down feature disconnects the load from V
IN
and
reduces quiescent current to less than 1μA.
The AAT2845A is available in a Pb-free, thermally-
enhanced 20-pin 3x4mm TQFN package.
Features
Input Voltage Range: 2.7V to 5.5V
Four-Channel LED Driver:
— Tri-Mode Charge Pump
— Up to 20mA/Channel
— Easy Control with Single Wire Interface
— 16 Current Levels
— Four Low Current Settings Down to 50μA
— Low I
Q
(50μA) for Low Current Mode
— >90% Peak Efficiency
Dual 200mA LDOs
Automatic Soft-Start
Over-Temperature Protection
Available in 3x4mm TQFN34-20 Package
-40°C to +85°C Temperature Range
Applications
Camera Function Power Supplies
Camera Phone Displays
LCD Modules
White LED Backlighting
Typical Application
C1
1μF
C2
1μF
C1-
IN
C1+ C2-
C2+
OUT
D1
D2
D3
D4
200mA
LDOA
AAT2845A
GND
EN/SET
S
2
Cwire Backlight Control
Co
1
C
OUT
1μF
C
IN
2.2μF
V
3.6V
200mA
LDOB
Co
2
ENLDO
LDO Enable
CBP
IN
FBA
FBB
C
0.1μF
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AAT2845AIML-EE-T1 | Four-Channel Backlight Driver with Dual LDOs |
| AAT2845 | Four-Channel Backlight Driver with Dual LDOs |
| AAT2845IML-EE-T1 | Four-Channel Backlight Driver with Dual LDOs |
| AAT2846 | High Current Charge Pump with Dual LDO for Backlight and Flash Applications |
| AAT2846INJ-EE-T1 | High Current Charge Pump with Dual LDO for Backlight and Flash Applications |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AAT2845AIML-EE-T1 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:Four-Channel Backlight Driver with Dual LDOs |
| AAT2845IML-EE-T1 | 制造商:Skyworks Solutions Inc 功能描述:WLED CHPUMP + 2XLDO 20TQFN TR 制造商:Skyworks Solutions Inc 功能描述:Voltage Regulators - Switching Regulators 4-Channel Backlight Driver w/Dual LDOs 制造商:Skyworks Solutions Inc 功能描述:LED DRIVER IC |
| AAT2845IML-QG-T1 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:Four-Channel Backlight Driver with Dual LDOs |
| AAT2845IML-QI-T1 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:Four-Channel Backlight Driver with Dual LDOs |
| AAT2846 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:High Current Charge Pump with Dual LDO for Backlight and Flash Applications |
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