LED Driver. LT3517 Datasheet

LT3517 Driver. Datasheet pdf. Equivalent

Part LT3517
Description Full-Featured LED Driver
Feature www.DataSheet4U.com LT3517 Full-Featured LED Driver with 1.5A Switch Current DESCRIPTION The LT®351.
Manufacture Linear Technology
Total Page 20 Pages
Datasheet
Download LT3517 Datasheet



LT3517
www.DataSheet4U.com
LT3517
Full-Featured LED Driver
with 1.5A Switch Current
FEATURES
DESCRIPTION
5000:1 True Color PWMTM Dimming Ratio
1.5A, 45V Internal Switch
100mV High Side Current Sense
Open LED Protection
Adjustable Frequency: 250kHz to 2.5MHz
Wide Input Voltage Range:
Operation from 3V to 30V
Transient Protection to 40V
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
APPLICATIONS
Display Backlighting
Automotive and Avionic Lighting
Illumination
Scanners
The LT®3517 is a current mode DC/DC converter with an
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 the16-Pin TSSOP packages. The LT3517
provides a complete solution for both constant-voltage
and constant-current applications.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
True Color PWM is a trademark of Linear Technology Corporation. Patent Pending.
All other trademarks are the property of their respective owners.
*Patents Pending.
TYPICAL APPLICATION
1A Buck Mode LED Driver
PVIN
24V
VIN
3.3V
2.2μF
VREF
PWM
2.2μF
100mΩ
ISP
VIN
SHDN
ISN TG
SW
LT3517
CTRL
FB
PWM
SS
SYNC
RT
TGEN VREF VC GND
0.1μF
1A
16.9k
1MHz
10μF
15μH
0.1μF
3517 TA01a
Efficiency
100
CTRL = VREF
90
80
70
60
50
40
0
20 40 60 80
PWM DUTY CYCLE (%)
100
3517 TA01b
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LT3517
LT3517www.DataSheet4U.com
ABSOLUTE MAXIMUM RATINGS
(Note 1)
VIN, SHDN, PWM, TGEN (Note 3)..............................40V
SW, ISP, ISN, TG........................................................45V
TG Pin Below ISP Pin................................................10V
FB, SYNC, SS, CTRL ...................................................6V
VC, RT, VREF .................................................................3V
Operating Junction Temperature Range (Notes 2,4)
LT3517E..............................................–40ºC to 125ºC
LT3517I...............................................–40ºC to 125ºC
LT3517H .............................................–40ºC to 150ºC
Storage Temperature Range
QFN.....................................................–65ºC to 125ºC
TSSOP ................................................–65ºC to 150ºC
Lead Temperature (Soldering, 10 sec)
TSSOP ..............................................................300ºC
PIN CONFIGURATION
TOP VIEW
VIN 1
SHDN 2
VREF
RT
SYNC
3
4
5
SS 6
PWM 7
CTRL 8
16 SW
15 SW
14 TG
13 ISP
17
GND 12 ISN
11 TGEN
10 FB
9 VC
FE PACKAGE
16-LEAD PLASTIC TSSOP
TJMAX = 150°C, QJA = 40°C/W, QJC(PAD) = 10°C/W
TOP VIEW
16 15 14 13
SW 1
12 FB
SW 2
VIN 3
SHDN 4
17 11 VC
10 CTRL
9 PWM
5678
UF PACKAGE
16-LEAD (4mm × 4mm) PLASTIC QFN
TJMAX = 125°C, θJA = 36°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LT3517EUF#PBF
LT3517IUF#PBF
LT3517EFE#PBF
LT3517IFE#PBF
LT3517HFE#PBF
TAPE AND REEL
LT3517EUF#TRPBF
LT3517IUF#TRPBF
LT3517EFE#TRPBF
LT3517IFE#TRPBF
LT3517HFE#TRPBF
PART MARKING*
3517
3517
3517FE
3517FE
3517HFE
PACKAGE DESCRIPTION
16-Lead (4mm × 4mm) Plastic QFN
16-Lead (4mm × 4mm) Plastic QFN
16-Lead Plastic TSSOP
16-Lead Plastic TSSOP
16-Lead Plastic TSSOP
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 150°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container
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/
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