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LT3593
1MHz White LED Driver with
Output Disconnect and One
Pin Current Programming
FEATURES
DESCRIPTION
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Drives Up to Ten White LEDs from a 3V Supply
One Pin Shutdown and Current Programming
LEDs Disconnected in Shutdown
32:1 Linear Brightness Control Range
V IN Range: 2.7V to 5.5V
±5% Output Current Accuracy at Full Scale
Low Shutdown Current: 3μA
1MHz Switching Frequency
Requires Only 1μF Output Capacitor
Low Pro?le 6-Lead DFN (2mm × 2mm × 0.75mm)
and 6-Lead SOT-23 Packages
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.
APPLICATIONS
The LT3593 switches at 1MHz, allowing the use of tiny
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Cell Phones
Digital Cameras
PDAs, Handheld Computers
MP3 Players
GPS Receivers
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
Conversion Ef?ciency
V IN
3V TO 5V
1μF
10μH
1μF
90
80
V IN = 3.6V
10 LEDs
V IN
SW
LT3593
CAP
70
SHUTDOWN AND
CURRENT CONTROL
CTRL
GND
LED
60
50
40
30
0
5
10
15
20
LED CURRENT (mA)
3593 TA01b
3593 TA01a
3593f
1
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