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LT3494

更新时间： 2024-09-12 04:19:35
品牌 Logo 应用领域
凌特 - Linear 驱动器肖特基二极管
页数 文件大小 规格书
24页 450K
描述
20mA LED Driver and OLED Driver with Integrated Schottky in 3mm x 2mm DFN

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中文翻译

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LT3494 数据手册

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LT3498  
20mA LED Driver and  
OLED Driver with Integrated  
Schottky in 3mm x 2mm DFN  
DESCRIPTION  
FEATURES  
The LT®3498 is a dual output boost converter featuring a  
2.3MHzPWMLEDDriverandPFMOLEDDriver.Itincludes  
an internal power switch and Schottky diode for each  
driver. Both converters can be independently shut down  
and modulated. This highly integrated power solution is  
ideal for dual display electronic devices.  
■
Dual Output Boost for Dual Display Devices  
■
Drives Up to Six White LEDs and OLED/LCD Bias  
■
Internal Power Switches and Schottky Diodes  
■
Independent Dimming and Shutdown  
■
200mV High Side Sense on LED Driver Allows  
“One-Wire Current Source”  
■
Wide Input Voltage Range: 2.5V to 12V  
The2.3MHzstep-upconverterisdesignedtodriveuptosix  
white LEDs in series from a Li-Ion cell. The device features  
a unique high side LED current sense that enables the part  
tofunctionasa“one-wire”currentsource—onesideofthe  
LEDstringcanbereturnedtogroundanywhere.Traditional  
LED drivers use a grounded resistor to sense LED current,  
requiring a 2-wire connection to the LED string.  
■
Wide Output Voltage Range: Up to 32V  
■
2.3MHz PWM Frequency for LED Driver  
■
PFM for OLED Driver is Non-Audible Over Entire  
Load Range  
■
Open LED Protection (27V Maximum on CAP1 Pin)  
■
OLED Output Disconnect  
■
Available in 12-Pin DFN Package  
■
The PFM OLED driver is a low noise boost converter that  
featuresanovelcontroltechnique.*Theconvertercontrols  
power delivery by varying both the peak inductor current  
and switch off time. This technique results in low output  
voltage ripple, as well as, high efficiency over a wide load  
range. The off time of the switch is not allowed to exceed a  
fixed level, guaranteeing a switching frequency that stays  
above the audio band.  
1mm Tall Solution Height  
APPLICATIONS  
■
Cellular Phones  
■
PDAs, Handheld Computers  
■
Digital Cameras  
■
MP3 Players  
■
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
All other trademarks are the property of their respective owners.  
GPS Receivers  
*Patent Pending  
TYPICAL APPLICATION  
Li-Ion to Six White LEDs and OLED/LCD Bias  
OLED Efficiency  
80  
75  
70  
65  
60  
55  
50  
45  
40  
400  
350  
300  
250  
200  
150  
100  
50  
V
= 3V TO 5V  
V
V
= 3.6V  
IN  
IN  
OUT2  
4.7µF  
0.47µF  
= 16V  
LOAD FROM V  
OUT2  
15µH  
15µH  
16V  
24mA  
1µF  
CAP1 SW1  
V
SW2 CAP2 V  
OUT2  
IN  
LT3498  
LED1 CTRL1 GND1 GND2 CTRL2 FB2  
OFF OFF  
10Ω  
10µF  
2.21MΩ  
20mA  
ON  
ON  
POWER LOSS  
FROM V  
SHUTDOWN  
AND  
DIMMING  
CONTROL  
SHUTDOWN  
AND  
OUT2  
CONTROL  
0
100  
0.1  
1
10  
3498 TA01  
LED CURRENT (mA)  
3498 TA01b  
3498f  
1
1234567...24

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