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LT3466-1
White LED Driver and Boost
Converter in 3mm × 3mm
DFN Package
FEATURES
DESCRIPTIO
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Drives Up to 10 White LEDs from a 3.6V Supply
Two Independent Step-Up DC/DC Converters
Independent Dimming and Shutdown Control
of the Outputs
± 1.5% Output Voltage Accuracy (Boost Converter)
± 4% LED Current Programming Accuracy
Internal Schottky Diodes
Internal Soft-Start Eliminates Inrush Current
Output Overvoltage Protection (39.5V Max V OUT )
Fixed Frequency Operation Up to 2MHz
83% Efficiency Driving 8 White LEDs at 15mA
from a 3.6V Supply
Wide Input Voltage Range: 2.7V to 24V
Tiny (3mm × 3mm) 10-Lead DFN Package
LT ? 3466-1 is a dual switching regulator that combines a
white LED driver and a boost converter in a low profile,
small footprint (3mm × 3mm × 0.75mm) DFN package.
The LED driver can be configured to drive up to 10 White
LEDs in series and the boost converter can be used for
generating the LCD bias voltages or driving a secondary
OLED display. Series connection of the LEDs provides
identical LED currents resulting in uniform brightness and
eliminating the need for ballast resistors and expensive
factory calibration.
The LT3466-1 provides independent dimming and shut-
down control of the two converters. The operating fre-
quency can be set with an external resistor over a 200kHz
to 2MHz range. The white LED driver features a low 200mV
reference, thereby minimizing power loss in the current
APPLICATIO S
■ White LED and OLED Displays
■ Digital Cameras, Sub-Notebook PCs
■ PDAs, Handheld Computers
■ TFT - LCD Bias Supply
■ Automotive
setting resistor for better efficiency. The boost converter
achieves ± 1.5% output voltage accuracy by the use of a
precision 0.8V reference. Protection features include out-
put overvoltage protection and internal soft-start. Wide
input supply range allows operation from 2.7V to 24V.
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATIO
3V TO 5V
Conversion Efficiency
33 μ H
33 μ H
1 μ F
90
V IN = 3.6V
85
SW1
V IN
SW2
80
LED DRIVER
BOOST CONVERTER
75
6 LEDs
1 μ F
V OUT1
LT3466-1
V OUT2
1 μ F
16V
30mA
70
65
FB1
FB2
475k
60
CTRL1
R T GND
CTRL2
55
10 ?
SHUTDOWN
AND DIMMING
63.4k
SHUTDOWN
AND DIMMING
24.9k
50
0
5
10
15
20
25
30
CONTROL 1
CONTROL 2
34661 F01a
OUTPUT CURRENT (mA)
34661 F01b
Figure 1. Li-Ion Powered Driver for 6 White LEDs and OLED Display
34661f
1
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