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LT3491
White LED Driver with
Integrated Schottky in SC70
and 2mm × 2mm DFN
FEATURES
DESCRIPTIO
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Drives Up to Six White LEDs from a 3V Supply
High Side Sense Allows “One Wire Current Source”
Internal Schottky Diode
One Pin Dimming and Shutdown
27V Open LED Protection
2.3MHz Switching Frequency
± 5% Reference Accuracy
V IN Range: 2.5V to 12V
Requires Only 1 μ F Output Capacitor
Wide 300:1 True Color PWM TM Dimming Range
8-Lead SC70 Package
Low Profile 6-Lead DFN Package
(2mm × 2mm × 0.75mm)
The LT ? 3491 is a fixed frequency step-up DC/DC converter
specifically designed to drive up to six white LEDs in series
fromaLi-Ioncell.SeriesconnectionoftheLEDsprovides
identical LED currents resulting in uniform brightness and
eliminating the need for ballast resistors. The device
features a unique high side LED current sense that enables
the part to function as a “one wire current source;” one
side of the LED string can be returned to ground anywhere,
allowing a simpler one wire LED connection. Traditional
LED drivers use a grounded resistor to sense LED current,
requiring a 2-wire connection to the LED string.
The 2.3MHz switching frequency allows the use of tiny
inductors and capacitors. A single pin performs both
APPLICATIO S
shutdown and accurate LED dimming control. Few exter-
nal components are needed: open-LED protection and the
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Cellular Phones
PDAs, Handheld Computers
Digital Cameras
MP3 Players
GPS Receivers
Schottky diode are all contained inside the tiny SC70 and
2mm × 2mm DFN packages. With such a high level of
integration, the LT3491 provides a high efficiency LED
driver solution in the smallest of spaces.
, LTC, LT and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATIO
Li-Ion Driver for Four White LEDs
Efficiency
SHUTDOWN AND
DIMMING CONTROL
80
75
V IN = 3.6V
4 LEDs
V IN
3V TO 5V
L1
10 μ H
V IN
CTRL
LT3491
CAP
R SENSE
10 ?
70
65
60
SW
LED
C1
1 μ F
GND
C2
1 μ F
55
50
45
40
C1: TAIYO YUDEN LMK212BJ105MD
3491 TA01a
0
5
10
LED CURRENT (mA)
15
20
C2: TAIYO YUDEN GMK316BJ105ML
3491 TA01b
L1: MURATA LQH32CN100
3491fa
1
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