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Linear Technology Electronic Components Datasheet

LT3593 Datasheet

1MHz White LED Driver

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LT3593
1MHz White LED Driver with
Output Disconnect and One
Pin Current Programming
FEATURES
n Drives Up to Ten White LEDs from a 3V Supply
n One Pin Shutdown and Current Programming
n LEDs Disconnected in Shutdown
n 32:1 Linear Brightness Control Range
n VIN Range: 2.7V to 5.5V
n ±5% Output Current Accuracy at Full Scale
n Low Shutdown Current: 3μA
n 1MHz Switching Frequency
n Requires Only 1μF Output Capacitor
n Low Profile 6-Lead DFN (2mm × 2mm × 0.75mm)
and 6-Lead SOT-23 Packages
APPLICATIONS
n Cell Phones
n Digital Cameras
n PDAs, Handheld Computers
n MP3 Players
n GPS Receivers
DESCRIPTION
The LT®3593 is a step-up DC/DC converter designed to
drive up to ten white LEDs in series from a Li-Ion cell.
Series connection of the LEDs provides identical LED
currents and eliminates 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”
where the low side of the LED string can be returned to
ground anywhere.
Additional features include output disconnect in shutdown,
open LED protection and 1-pin shutdown/LED current
control. The CTRL pin is toggled to adjust the LED current
via an internal counter and a 5-bit DAC.
The LT3593 switches at 1MHz, allowing the use of tiny
external components. Constant frequency switching re-
sults in low input noise and a small output capacitor. The
LT3593 is available in the 6-lead DFN (2mm × 2mm) as
well as the 6-lead SOT-23 packages.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
Li-Ion Driver for Ten White LEDs
VIN
3V TO 5V
10μH
1μF
VIN
SW
CAP
SHUTDOWN AND
CURRENT CONTROL
LT3593
CTRL
LED
GND
1μF
3593 TA01a
Conversion Efficiency
90
VIN = 3.6V
10 LEDs
80
70
60
50
40
30
0
5 10 15
LED CURRENT (mA)
20
3593 TA01b
3593f
1


Linear Technology Electronic Components Datasheet

LT3593 Datasheet

1MHz White LED Driver

No Preview Available !

LT3593www.DataSheet4U.com
ABSOLUTE MAXIMUM RATINGS (Note 1)
Input Voltage...............................................................6V
CTRL Voltage ..............................................................6V
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
Lead Temperature (Soldering, 10 sec)
TSOT Package................................................... 300°C
PIN CONFIGURATION
TOP VIEW
VIN 1
6 SW
GND 2
7 5 CAP
CTRL 3
4 LED
DC PACKAGE
6-LEAD (2mm × 2mm) PLASTIC DFN
TJMAX = 125°C, θJA = 106°C/W
EXPOSED PAD (PIN 7) IS GND, MUST BE SOLDERED TO PCB
TOP VIEW
CTRL 1
GND 2
VIN 3
6 LED
5 CAP
4 SW
S6 PACKAGE
6-LEAD PLASTIC TSOT-23
TJMAX = 125°C, θJA = 192°C/W
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LT3593EDC#PBF
LT3593EDC#TRPBF
LDBR
6-Lead (2mm × 2mm) Plastic DFN
LT3593ES6#PBF
LT3593ES6#TRPBF
LTDBS
6-Lead Plastic TSOT-23
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 85°C
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 3.6V, VCTRL = 3.6V, unless otherwise specified.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Operating Voltage Range
2.7 5.5 V
Supply Current
Not Switching; During Current Programming
300 μA
CTRL = 0
3 10
μA
Switching Frequency
0.85 1 1.15 MHz
Maximum Duty Cycle
92 94
%
Switch Current Limit
550 700
mA
Switch VCESAT
ISW = 250mA
250 mV
3593f
2


Part Number LT3593
Description 1MHz White LED Driver
Maker Linear Technology
PDF Download

LT3593 Datasheet PDF






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