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LT3517IFE#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
LT3517
1
3517fh
For more information www.linear.com/LT3517
Features
applications
Description
Full-Featured LED Driver
with 1.5A Switch Current
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 sour
ce.
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.
n
5000:1 True Color PWM™ Dimming Ratio
n
1.5A, 45V Internal Switch
n
100mV High Side Current Sense
n
Open LED Protection
n
Adjustable Frequency: 250kHz to 2.5MHz
n
Wide Input Voltage Range:
n
Operation from 3V to 30V
n
Transient Protection to 40V
n
Operates in Boost, Buck Mode and Buck-Boost Mode
n
Gate Driver for PMOS LED Disconnect
n
Constant-Current and Constant-Voltage Regulation
n
CTRL Pin Provides 10:1 Analog Dimming
n
Low Shutdown Current: <1µA
n
Available in (4mm × 4mm) 16-Lead QFN and 16-Pin
TSSOP Packages
n
Display Backlighting
n
Automotive and Avionic Lighting
n
Illumination
n
Scanners
1A
10µF
15µH
2.2µF
0.1µF
100mΩ
2.2µF
V
REF
ISP
TGEN GNDV
REF
VC
16.9k
1MHz
3517 TA01a
0.1µF
V
IN
SHDN
CTRL
PWM
SYNC
FB
SS
RT
SW
PV
IN
24V
V
IN
3.3V
ISN
LT3517
TG
PWM
1A Buck Mode LED Driver
Efficiency
PWM DUTY CYCLE (%)
0
40
EFFICIENCY (%)
50
60
70
80
90
100
20 40 60 80
3517 TA01b
100
CTRL = V
REF
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks
and True Color PWM is a trademark of Analog Devices, Inc. All other trademarks are the
property of their respective owners. Protected by U.S. Patents, including 7199560, 7321203,
7746300.
typical application
LT3517
2
3517fh
For more information www.linear.com/LT3517
absolute MaxiMuM ratings
V
IN
, SHDN, PWM, TGEN (Note 3) .............................40V
SW, ISP, ISN, TG .......................................................45V
TG Pin Below ISP Pin ................................................ 10V
FB, SYNC, SS, CTRL ...................................................6V
VC, RT, V
REF
................................................................3V
Operating Junction Temperature Range (Notes 2,4)
LT3517E .............................................–40°C to 125°C
LT3517I .............................................. –40°C to 125°C
LT3517H ............................................–40°C to 150°C
(Note 1)
pin conFiguration
orDer inForMation
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3517EUF#PBF LT3517EUF#TRPBF 3517 16-Lead (4mm × 4mm) Plastic QFN –40°C to 125°C
LT3517IUF#PBF LT3517IUF#TRPBF 3517 16-Lead (4mm × 4mm) Plastic QFN –40°C to 125°C
LT3517HUF#PBF LT3517HUF#TRPBF 3517 16-Lead (4mm × 4mm) Plastic QFN –40°C to 150°C
LT3517EFE#PBF LT3517EFE#TRPBF 3517FE 16-Lead Plastic TSSOP –40°C to 125°C
LT3517IFE#PBF LT3517IFE#TRPBF 3517FE 16-Lead Plastic TSSOP –40°C to 125°C
LT3517HFE#PBF LT3517HFE#TRPBF 3517FE 16-Lead Plastic TSSOP –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/. Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
Storage Temperature Range
QFN .................................................... –65°C to 150°C
TSSOP ...............................................–65°C to 150°C
Lead Temperature (Soldering, 10 sec)
TSSOP ............................................................. 300°C
FE PACKAGE
16-LEAD PLASTIC TSSOP
1
2
3
4
5
6
7
8
TOP VIEW
16
15
14
13
12
11
10
9
V
IN
SHDN
V
REF
RT
SYNC
SS
PWM
CTRL
SW
SW
TG
ISP
ISN
TGEN
FB
VC
17
T
JMAX
= 150°C, θ
JA
= 40°C/W, θ
JC
(PAD) = 10°C/W
16 15 14 13
5 6 7 8
TOP VIEW
17
GND
UF PACKAGE
16-LEAD (4mm × 4mm) PLASTIC QFN
9
10
11
12
4
3
2
1SW
SW
V
IN
SHDN
FB
VC
CTRL
PWM
TG
ISP
ISN
TGEN
V
REF
RT
SYNC
SS
T
JMAX
= 150°C, θ
JA
= 36°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
http://www.linear.com/product/LT3517#orderinfo
LT3517
3
3517fh
For more information www.linear.com/LT3517
electrical characteristics
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum V
IN
Operating Voltage 3 V
Maximum V
IN
Operating Voltage Continuous Operation (Note 3) 30 V
Current Sense Voltage (V
ISP
– V
ISN
) V
CTRL
= 2V, V
ISP
= 24V, VC = 1V
V
CTRL
= 2V, V
ISP
= 0V, VC = 1V
●
96 100
100
103 mV
mV
10% Scale Current Sense Voltage (V
ISP
– V
ISN
) V
CTRL
= 100mV, V
ISP
= 24V, VC = 1V 9 mV
Current Sense Voltage Line Regulation 2V < V
ISP
< 45V 0.03 %/V
V
IN
Supply Current PWM > 1.5V, VC = 0V
PWM = 0V
SHDN = 0V
6
4.5
0.1
10
1
mA
mA
µA
Switching Frequency R
T
= 16.7k
R
T
= 4.03k
R
T
= 91.5k
l
0.85
2.25
220
1
2.5
250
1.15
2.7
270
MHz
MHz
kHz
RT V
oltage 1 V
Soft-Start Pin Current SS = 0.5V, Out of Pin 6 9 12 µA
SYNC Pull-Down Current (Into the Pin) V
SYNC
= 2V 60 µA
SYNC Input Low 0.4 V
SYNC Input High 1.5 V
Maximum Duty Cycle R
T
= 91.5k (250kHz)
SYNC = 300kHz Clock Signal, R
T
= 91.5k
R
T
= 16.7k (1MHz)
R
T
= 4.03k (2.5MHz)
l
95
94
85
97
96
90
74
%
%
%
%
Switch Current Limit 1.5 1.9 2.3 A
Switch V
CESAT
I
SW
= 1A 300 mV
Switch Leakage Current V
SW
= 45V, PWM = 0V 2 µA
CTRL Input Bias Current Current Out of Pin, V
CTRL
= 0.1V 20 100 nA
Error Amplifier Transconductance 550 µS
VC Output Impedance 1000 kΩ
VC Idle Input Bias Current PWM = 0V, VC = 1V –20 0 20 nA
FB Pin Input Bias Current Current Out of Pin, V
FB
= 0.5V 20 100 nA
FB Pin Threshold
l
0.98 1.01 1.04 V
ISP
, ISN Idle Input Bias Current PWM = 0V, ISP = ISN = 24V 300 nA
ISP
, ISN Full-Scale Input Bias Current ISP Tied to ISN, V
ISP
= 24V, V
CTRL
= 2V 20 µA
SHDN Voltage High
l
1.2 V
SHDN Voltage Low –40°C ≤ T
J
≤ 125°C
125°C < T
J
≤ 150°C
0.45
0.40
V
V
SHDN Pin Bias Current 60 100 µA
PWM Input High Voltage
l
1.2 V
PWM Input Low Voltage –40°C ≤ T
J
≤ 125°C
125°C < T
J
≤ 150°C
0.45
0.40
V
V
PWM Pin Bias Current 60 120 µA
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Note 2) V
IN
= 5V, SHDN = 5V, PWM = 5V unless otherwise noted.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20

LT3517IFE#TRPBF

Mfr. #:
Buy LT3517IFE#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
LED Lighting Drivers 2.3A/1.3A, 45V, 2.5MHz Full Featured LED Driver w/ True Color PWM Dimming
Lifecycle:
New from this manufacturer.
Delivery:
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