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Linear Technology Electronic Components Datasheet

LT3591 Datasheet

White LED Driver

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FEATURES
Drives Up to Ten White LEDs from a 3V Supply
High Side Sense Allows “One Wire Current Source”
Internal Schottky Diode
One Pin Dimming and Shutdown
80:1 True Color PWMTM Dimming Range
42V Open LED Protection
1MHz Switching Frequency
±5% Reference Accuracy
VIN Range: 2.5V to 12V
Requires Only 2.2µF Output Capacitor
Low Profile 8-Lead DFN Package
(3mm × 2mm × 0.75mm)
APPLICATIONS
Cellular Phones
PDAs, Handheld Computers
Digital Cameras
MP3 Players
GPS Receivers
LT3591
White LED Driver with
Integrated Schottky in
3mm × 2mm DFN
DESCRIPTION
The LT®3591 is a fixed frequency step-up DC/DC converter
specifically designed to drive up to ten white LEDs in series
from a Li-Ion cell. Series connection of the LEDs provides
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 high switching frequency allows the use of tiny induc-
tors and capacitors. A single pin performs both shutdown
and accurate LED dimming control. Few external compo-
nents are needed: open-LED protection and the Schottky
diode are all contained inside a low profile 3mm × 2mm
DFN package.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
True Color PWM is a trademark of Linear Technology Corporation. All other trademarks are
the property of their respective owners.
TYPICAL APPLICATION
VIN
3V TO 5V
Li-Ion Driver for Ten White LEDs
SHUTDOWN AND
DIMMING CONTROL
22µH
1µF
CTRL
VIN CAP
LT3591
SW LED
GND
RSENSE
10
2.2µF
3591 TA01a
Conversion Efficiency
80
VIN = 3.6V
10 LEDs
75
70
65
60
55
0
5 10 15
LED CURRENT (mA)
20
3591 TA01b
3591f
1


Linear Technology Electronic Components Datasheet

LT3591 Datasheet

White LED Driver

No Preview Available !

LT3591www.DataSheet4U.com
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Input Voltage (VIN)................................................... 12V
CTRL Voltage ........................................................... 12V
SW Voltage .............................................................. 45V
CAP Voltage ............................................................. 45V
LED Voltage ............................................................. 45V
Operating Junction Temperature Range
(Note 2) ...............................................–40°C to 85°C
Maximum Junction Temperature ........................ 125°C
Storage Temperature Range...................–65°C to 150°C
PACKAGE/ORDER INFORMATION
TOP VIEW
VIN 1
8 CTRL
GND 2
7 LED
9
NC 3
6 NC
SW 4
5 CAP
DDB PACKAGE
8-LEAD (3mm × 2mm) PLASTIC DFN
TJMAX = 125°C, θJA = 76°C/W
EXPOSED PAD (PIN 9) SHOULD BE CONNECTED TO PCB GROUND
ORDER PART NUMBER DDB PART MARKING
LT3591EDDB
LCPG
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 3V, VCTRL = 3V, unless otherwise specified.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Minimum Operating Voltage
2.5 V
LED Current Sense Voltage (VCAP – VLED)
CAP Pin Bias Current
LED Pin Bias Current
Supply Current
VCAP = 24V, ISW = 300mA
VCAP = 36V, VLED = 35.8V
VCAP = 36V, VLED = 35.8V
VCAP = 24V, VLED = 23V
CTRL = 0V
190 200 210
40 80
20 40
45
9 11
mV
µA
µA
mA
µA
Switching Frequency
0.75 1 1.2 MHz
Maximum Duty Cycle
92 94
%
Switch Current Limit
500
800
mA
Switch VCESAT
Switch Leakage Current
VCTRL for Full LED Current
VCTRL to Shut Down IC
VCTRL to Turn On IC
CTRL Pin Bias Current
ISW = 300mA
VSW = 24V
VCAP = 44V
1.5
200
0.1
100
100
5
50
mV
µA
V
mV
mV
nA
CAP Pin Overvoltage Protection
40 42 44
V
Schottky Forward Drop
Schottky Leakage Current
ISCHOTTKY = 200mA
VR = 30V
0.8
4
V
µA
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LT3591E is guaranteed to meet performance specifications
from 0°C to 85°C operating junction temperature range. Specifications
over the –40°C to 85°C operating junction temperature range are assured
by design, characterization and correlation with statistical process controls.
3591f
2


Part Number LT3591
Description White LED Driver
Maker Linear Technology
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LT3591 Datasheet PDF






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