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LT3466 PDF预览

LT3466

更新时间: 2024-11-05 22:46:55
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20页 325K
描述
Dual Full Function White LED Step-Up Converter with Built-In Schottky Diodes

LT3466 数据手册

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LT3466  
Dual Full Function White LED  
Step-Up Converter with  
Built-In Schottky Diodes  
U
FEATURES  
DESCRIPTIO  
LT®3466 is a dual full function step-up DC/DC converter  
specifically designed to drive up to 20 White LEDs (10 in  
series per converter) with a constant current. Series  
connection of the LEDs provides identical LED currents  
resulting in uniform brightness and eliminating the need  
for ballast resistors and expensive factory calibration.  
Drives Up to 20 White LEDs (10 in Series  
per Converter) from a 3.6V Supply  
Two Independent Step-Up Converters Capable of  
Driving Asymmetric LED Strings  
Independent Dimming and Shutdown Control  
of the Two LED Strings  
Internal Schottky Diodes  
Internal Soft-Start Eliminates Inrush Current  
Open LED Protection (42V Max VOUT  
Fixed Frequency Operation Up to 2MHz  
81% Efficiency Driving 16 White LEDs at 15mA  
(Eight per Driver) from a 3.6V Supply  
Wide Input Voltage Range: 2.7V to 24V  
Tiny (3mm × 3mm) 10-Lead DFN Package  
The two independent converters are capable of driving  
asymmetric LED strings. The dimming of the two LED  
strings can also be controlled independently. The LT3466  
is ideal for providing backlight for main and sub-displays  
in cell phones and other handheld devices.  
)
The LT3466 operating frequency can be set with an  
external resistor over a 200kHz to 2MHz range. A low  
200mV feedback voltage minimizes power loss in the  
current setting resistor for better efficiency. Additional  
features include output voltage limiting when LEDs are  
disconnected and internal soft-start.  
U
APPLICATIO S  
Main/Sub Displays  
Digital Cameras, Sub-Notebook PCs  
The LT3466 is available in a low profile, small footprint  
(3mm × 3mm × 0.75mm) DFN package.  
PDAs, Handheld Computers  
Automotive  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
U
TYPICAL APPLICATIO  
3V TO 5V  
Conversion Efficiency  
85  
1µF  
V
= 3.6V  
IN  
8/8 LEDs  
80  
75  
70  
65  
60  
55  
50  
47µH  
SW2  
47µH  
SW1  
V
IN  
LED1  
LED2  
V
V
OUT2  
OUT1  
2.2µF  
2.2µF  
LT3466  
FB1  
FB2  
R
T
CTRL1  
GND CTRL2  
63.4k  
SHUTDOWN  
SHUTDOWN  
AND DIMMING  
CONTROL 2  
10Ω  
10Ω  
AND DIMMING  
CONTROL 1  
0
5
10  
15  
20  
LED CURRENT (mA)  
3466 F01a  
3466 F01b  
Figure 1. Li-Ion Powered Driver for 8/8 White LEDs  
3466f  
1

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