LED Driver. LT3593 Datasheet

LT3593 Driver. Datasheet pdf. Equivalent

Part LT3593
Description 1MHz White LED Driver
Feature www.DataSheet4U.com LT3593 1MHz White LED Driver with Output Disconnect and One Pin Current Program.
Manufacture Linear Technology
Datasheet
Download LT3593 Datasheet



LT3593
www.DataSheet4U.com
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
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LT3593
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
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