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AAT2805IXN-4.5-T1 PDF预览

AAT2805IXN-4.5-T1

更新时间: 2024-01-17 12:14:36
品牌 Logo 应用领域
ANALOGICTECH 驱动程序和接口接口集成电路
页数 文件大小 规格书
17页 558K
描述
Dual High Efficiency Charge Pump for White LED and Flash Applications

AAT2805IXN-4.5-T1 技术参数

生命周期:Obsolete包装说明:,
Reach Compliance Code:unknown风险等级:5.84
Is Samacsys:NBase Number Matches:1

AAT2805IXN-4.5-T1 数据手册

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AAT2805  
Dual High Efficiency Charge Pump  
for White LED and Flash Applications  
ChargePump  
General Description  
Features  
The AAT2805 is a dual charge pump designed to  
support both the white LED backlight and flash appli-  
cations for systems operating with lithium-ion/poly-  
mer batteries. The backlight charge pump is capable  
of driving up to four LEDs at a total of 120mA. The  
current sinks may be operated individually or in par-  
allel for driving higher current LEDs. To maximize  
power efficiency, the charge pump operates in 1X,  
1.5X, or 2X mode, where the mode of operation is  
automatically selected by comparing the forward  
voltage of each LED with the input voltage.  
AnalogicTech's AS2Cwire™ (Advanced Simple Serial  
Control™) serial digital input is used to enable, dis-  
able, and set current for each LED with a 16-level  
logarithmic scale plus four low-current settings down  
to 50µA for optimized efficiency, with a typical oper-  
ating quiescent current of less than 50µA.  
VIN Range: 2.7V to 5.5V  
Dual Charge Pump to Support Backlight and  
Flash LEDs  
Backlight Charge Pump:  
— Regulated Current  
— Four Current Sink Inputs  
— AS2Cwire Brightness Control  
— Tri-Mode Charge Pump  
— Maximum 30mA of Current Per Input  
— Low IQ (50µA) in Light Load Mode  
Flash Charge Pump:  
— Regulated Output Voltage  
— Up to 250mA of Pulsed Current  
Independent Backlight/Flash Control  
Low Noise 1MHz Constant Frequency  
Operation  
Automatic Soft-Start  
No Inductors  
Available in TDFN44-16 Package  
The flash charge pump is a charge pump doubler  
with a regulated output voltage. It is designed to  
deliver 120mA of continuous current and up to  
250mA of pulsed current. It has an independent  
enable pin for improved power savings.  
Applications  
The AAT2805 has thermal protection and built-in  
soft-start circuitry. A low-current shutdown feature  
disconnects the load from VIN and reduces quiescent  
current to less than 1µA.  
Color (RGB) Lighting  
White LED Backlighting  
White LED Photo Flash  
The AAT2805 is available in a space-saving, ther-  
mally-enhanced TDFN44-16 package and is rated  
over the -40°C to +85°C temperature range.  
Typical Application  
C1  
1µF  
C2  
1µF  
C3  
1µF  
C1+ C1- C2+ C2- C3+ C3-  
VOUT_FL  
VOUT_FLASH  
COUT  
1µF  
Flash  
VIN  
AAT2805  
V
CIN  
1µF  
IN  
Backlight  
D4  
VOUT_BL  
D2  
D3  
D1  
EN/SET  
EN/SET  
D1  
D2  
D3  
EN_FLSH  
EN_FLSH  
COUT  
1µF  
D4  
GND  
2805.2005.05.1.2  
1

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