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LT3466 Fiches technique(PDF) 1 Page - Linear Technology

No de pièce LT3466
Description  Dual Full Function White LED Step-Up Converter with Built-In Schottky Diodes
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Fabricant  LINER [Linear Technology]
Site Internet  http://www.linear.com
Logo LINER - Linear Technology

LT3466 Fiches technique(HTML) 1 Page - Linear Technology

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1
LT3466
3466f
Dual Full Function White LED
Step-Up Converter with
Built-In Schottky Diodes
Figure 1. Li-Ion Powered Driver for 8/8 White LEDs
s
Drives Up to 20 White LEDs (10 in Series
per Converter) from a 3.6V Supply
s
Two Independent Step-Up Converters Capable of
Driving Asymmetric LED Strings
s
Independent Dimming and Shutdown Control
of the Two LED Strings
s
Internal Schottky Diodes
s
Internal Soft-Start Eliminates Inrush Current
s
Open LED Protection (42V Max VOUT)
s
Fixed Frequency Operation Up to 2MHz
s
81% Efficiency Driving 16 White LEDs at 15mA
(Eight per Driver) from a 3.6V Supply
s
Wide Input Voltage Range: 2.7V to 24V
s
Tiny (3mm
× 3mm) 10-Lead DFN Package
, LTC and LT are registered trademarks of Linear Technology Corporation.
s
Main/Sub Displays
s
Digital Cameras, Sub-Notebook PCs
s
PDAs, Handheld Computers
s
Automotive
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
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.
The LT3466 is available in a low profile, small footprint
(3mm
× 3mm × 0.75mm) DFN package.
CTRL1
GND CTRL2
RT
SW1
SW2
VIN
3V TO 5V
47
µH
1
µF
2.2
µF
2.2
µF
LED1
LED2
47
µH
LT3466
SHUTDOWN
AND DIMMING
CONTROL 2
SHUTDOWN
AND DIMMING
CONTROL 1
VOUT1
FB1
10
10
3466 F01a
VOUT2
FB2
63.4k
Conversion Efficiency
LED CURRENT (mA)
0
70
75
20
3466 F01b
60
50
65
55
5
10
15
85
VIN = 3.6V
8/8 LEDs
80
DESCRIPTIO
FEATURES
APPLICATIO S
TYPICAL APPLICATIO


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Numéro de composants électroniques

No de pièceDescriptionHtml ViewFabricant
LT3465AES6 1.2MHz/2.4MHz White LED Step-Up Converters with Built-In Schottky in ThinSOT 1  2  3  4  5  More Linear Technology
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