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LT3466
Dual Full Function White LED
Step-Up Converter with
Built-In Schottky Diodes
FEATURES
DESCRIPTIO
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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 (39.5V Max V OUT )
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
Available in 10-Pin DFN and 16-Pin Thermally
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.
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
Enhanced TSSOP Packages
APPLICATIO S
200mV feedback voltage minimizes power loss in the
current setting resistor for better efficiency. Additional
features include output voltage limiting when LEDs are
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Main/Sub Displays
Digital Cameras, Sub-Notebook PCs
PDAs, Handheld Computers
Automotive
disconnected and internal soft-start.
The LT3466 is available in the 10-pin (3mm × 3mm ×
0.75mm) DFN and 16-pin thermally enhanced TSSOP
packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
3V TO 5V
Conversion Efficiency
1 μ F
85
V IN = 3.6V
L1
47 μ H
L2
47 μ H
80
75
8/8 LEDs
LED1
2.2 μ F
SW1
V OUT1
V IN
LT3466
SW2
V OUT2
2.2 μ F
LED2
70
65
FB1
CTRL1
FB2
R T GND CTRL2
60
55
10 ?
OFF ON
SHUTDOWN
63.4k
OFF ON
SHUTDOWN
10 ?
50
0
5
10
15
20
AND DIMMING
CONTROL 1
AND DIMMING
CONTROL 2
3466 F01a
LED CURRENT (mA)
3466 F01b
Figure 1. Li-Ion Powered Driver for 8/8 White LEDs
3466fa
1
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