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AAT1281IWO-T1

更新时间： 2024-02-27 11:22:46
品牌 Logo 应用领域
思佳讯 - SKYWORKS 驱动接口集成电路
页数 文件大小 规格书
18页 543K
描述
LED Driver

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AAT1281IWO-T1 技术参数

是否Rohs认证： 符合生命周期：Active
Reach Compliance Code：compliantECCN代码：EAR99
HTS代码：8542.39.00.01风险等级：5.76
接口集成电路类型：LED DISPLAY DRIVER峰值回流温度（摄氏度）：NOT SPECIFIED
处于峰值回流温度下的最长时间：NOT SPECIFIEDBase Number Matches：1

AAT1281IWO-T1 数据手册

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PRODUCT DATASHEET  
AAT1281  
TM  
SwitchReg  
2A Driver IC for High Intensity LED Camera Flash  
Typical Application  
L1  
1µH  
SW  
OUT  
High Intensity White Flash LEDs  
VIN  
CIN  
2.2µF  
VBAT  
COUT  
2.2µF  
AAT1281  
Flash  
FLEN  
EN/SET  
POK  
Enable  
FLOUTA  
FLOUTB  
Enable  
POK  
CB  
CT  
RSET  
CT  
47nF  
AGND PGND FLGND  
Super Capacitor  
RSET  
80.6kΩ  
Pin Descriptions  
Pin # Symbol Function Description  
Flash timer control input. Connect a capacitor between CT and AGND to set default ON time for  
the flash output. A 47nF ceramic capacitor defaults the flash timer to 600ms. Alternative timeout  
periods can be programmed through AS2Cwire. To disable the flash timer, connect CT to AGND.  
1
CT  
I
Movie mode enable pin. Can also interface with AS2Cwire to adjust movie mode current level, CT  
timing, A/B Output select and Flash/Movie mode current ratio. See programming tables for details.  
2
3
4
EN/SET  
FLEN  
I
I
Flash enable pin. A low-to-high transition on the FLEN pin initiates a flash pulse and starts the  
flash timer.  
Analog ground pin. Connect AGND to PGND and FLGND at a single point as close to the AAT1281  
as possible.  
AGND  
P
Power input. Connect IN to the input power supply voltage. Connect a 2.2ꢀF or larger ceramic  
capacitor from IN to PGND as close as possible to the AAT1281.  
5
6
7
VIN  
SW  
PI  
O
P
Step-up converter switching node. Connect a 1ꢀH inductor between SW and IN.  
Power ground pin. Connect PGND to AGND and FLGND at a single point as close to the AAT1281  
as possible.  
PGND  
Power output of the step-up converter. Connect a 2.2ꢀF or larger ceramic capacitor from OUT to  
PGND as close as possible to the AAT1281. Connect OUT to the super capacitor and the anode(s)  
of the Flash LED(s).  
8
OUT  
O
9
CB  
I
Super Capacitor balancing pin. Connect the center tap of Super Capacitor here.  
POK output. Open drain, active low output. Connect pull-up resistor to VIN to indicate when the  
Super Capacitor is charged and “Ready to Flash”.  
10  
POK  
O
Flash Output B. Connect cathode of Flash LED B to FLOUTB. For a single flash LED, connect  
FLOUTB and FLOUTA together. For two flash LEDs, each output will conduct 50% of the total  
flash output current. Can be turned on or off using AS2Cwire in Movie mode.  
11  
12  
13  
FLOUTB  
FLGND  
FLOUTA  
O
P
Flash ground pin. Connect FLGND to PGND and AGND at a single point as close to the AAT1281  
as possible.  
Flash Output A. Connect cathode of Flash LED A to FLOUTA. For a single flash LED, connect  
FLOUTA and FLOUTB together. For two flash LEDs, each output will conduct 50% of the total  
flash output current. Can be turned on or off using AS2Cwire in Movie mode.  
O
Flash current setting input. A 80.6kꢂ resistor from RSET to AGND sets the maximum flash cur-  
rent available at FLOUTA and FLOUTB to 2000mA. Each FLOUTA and FLOUTB channel will conduct  
50% of the maximum programmed current (1000mA). This resistor also sets the maximum set-  
ting of the 16 programmable movie mode levels via AS2Cwire at EN/SET pin divided by 7.3.  
14  
RSET  
EP  
I
Exposed paddle (bottom); Connect EP to PGND as close as possible to the AAT1281.  
w w w . a n a l o g i c t e c h . c o m  
2
1281.2008.11.1.1  
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