LTC3783 LINER [Linear Technology], LTC3783 Datasheet
LTC3783
Manufacturer Part Number
LTC3783
Description
Full-Featured LED Driver with 1.5A Switch Current
Manufacturer
LINER [Linear Technology]
Datasheet
1.LTC3783.pdf
(20 pages)
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FEATURES
APPLICATIONS
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TYPICAL APPLICATION
5000:1 True Color PWM
1.5A, 45V Internal Switch
100mV High Side Current Sense
Open LED Protection
Adjustable Frequency: 250kHz to 2.5MHz
Wide Input Voltage Range:
Operates in Boost, Buck Mode and Buck-Boost Mode
Gate Driver for PMOS LED Disconnect
Constant-Current and Constant-Voltage Regulation
CTRL Pin Provides 10:1 Analog Dimming
Low Shutdown Current: <1μA
Available in (4mm × 4mm) 16-Lead QFN and 16-Pin
TSSOP Packages
Display Backlighting
Automotive and Avionic Lighting
Illumination
Scanners
PV
3.3V
24V
V
2.2μF
IN
IN
PWM
Operation from 3V to 30V
Transient Protection to 40V
V
REF
2.2μF
V
SHDN
CTRL
PWM
SYNC
1A Buck Mode LED Driver
TGEN
IN
ISP
100mΩ
0.1μF
V
LT3517
REF
ISN
VC
™
Dimming Ratio
TG
GND
SW
SS
RT
FB
1A
16.9k
1MHz
0.1μF
15μH
10μF
3517 TA01a
DESCRIPTION
The LT
internal 1.5A, 45V switch specifically designed to drive
LEDs. The LT3517 operates as a LED driver in boost,
buck mode and buck-boost mode. It combines a tradi-
tional voltage loop and a unique current loop to operate
as a constant-current source or constant-voltage source.
Programmable switching frequency allows optimization of
the external components for efficiency or component size.
The switching frequency of LT3517 can be synchronized
to an external clock signal. The LED current is externally
programmable with a 100mV sense resistor. The external
PWM input provides up to 5000:1 LED dimming. The CTRL
pin provides further 10:1 dimming ratio.
The LT3517 is available in the tiny footprint 16-lead QFN
(4mm × 4mm) and the 16-pin TSSOP packages. The
LT3517 provides a complete solution for both constant-
voltage and constant-current applications.
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered
trademarks and True Color PWM is a trademark of Linear Technology Corporation. All other
trademarks are the property of their respective owners. Protected by U.S. Patents, including
7199560, 7321203, 7746300.
with 1.5A Switch Current
Full-Featured LED Driver
®
3517 is a current mode DC/DC converter with an
100
90
80
70
60
50
40
0
CTRL = V
20
REF
PWM DUTY CYCLE (%)
Efficiency
40
60
80
3517 TA01b
100
LT3517
3517ff
1
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