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LT3755IMSE-2#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P26
LT3755/LT3755-1/LT3755-2
1
37551fd
Typical applicaTion
FeaTures
applicaTions
DescripTion
40V
IN
, 75V
OUT
LED Controllers
The LT
®
3755, LT3755-1 and LT3755-2 are DC/DC control-
lers designed to operate as a constant-current source for
driving high current LEDs. They drive a low side external
N-channel power MOSFET from an internal regulated 7.15V
supply. The fixed frequency, current mode architecture
results in stable operation over a wide range of supply
and output voltages. A ground referenced voltage FB pin
serves as the input for several LED protection features,
and also makes it possible for the converter to operate
as a constant-voltage source. A frequency adjust pin
allows the user to program the frequency from 100kHz
to 1MHz to optimize efficiency, performance or external
component size.
The LT3755/LT3755-1/LT3755-2 sense output current at
the high side of the LED string. High side current sensing
is the most flexible scheme for driving LEDs, allowing
boost, buck mode or buck-boost mode configuration.
The PWM input provides LED dimming ratios of up to
3000:1, and the CTRL input provides additional analog
dimming capability.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. 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.
50W White Automotive LED Headlamp Driver
n
3000:1 True Color PWM™ Dimming
n
Wide Input Voltage Range: 4.5V to 40V
n
Output Voltage Up to 75V
n
Constant-Current and Constant-Voltage Regulation
n
100mV High Side Current Sense
n
Drives LEDs in Boost, Buck Mode, Buck-Boost Mode,
SEPIC or Flyback Topology
n
Adjustable Frequency: 100kHz to 1MHz
n
Open LED Protection
n
Programmable Undervoltage Lockout with Hysteresis
n
Improved Open LED Status Pin (LT3755-2)
n
Frequency Synchronization (LT3755-1)
n
PWM Disconnect Switch Driver
n
CTRL Pin Provides Analog Dimming
n
Low Shutdown Current: <1µA
n
Programmable Soft-Start
n
Thermally Enhanced 16-Lead QFN (3mm × 3mm)
and MSOP Packages
n
High Power LED
n
Battery Chargers
n
Accurate Current Limited Voltage Regulators
V
IN
LT3755-2
22µH
GNDV
C
INTV
CC
SHDN/UVLO FB
V
REF
ISP
332k
100k
INTV
CC
1M
4.7µF
0.001µF
0.01µF
V
IN
8V TO
40V
185k
10k
28.7k
375kHz
4.7µF
40.2k
CTRL
0.015Ω
0.1Ω
1M
23.7k
1A
4.7µF
50W
LED
STRING
37551 TA01a
OPENLED
PWM
SS
RT
ISN
GATE
SENSE
PWMOUT
Efficiency vs V
IN
V
IN
(V)
0 10
80
EFFICIENCY (%)
84
88
92
96
100
20
30 40
37551 TA01b
LT3755/LT3755-1/LT3755-2
2
37551fd
absoluTe MaxiMuM raTings
V
IN
............................................................................40V
SHDN/UVLO (Note 3) ................................................40V
ISP, ISN .....................................................................75V
INTV
CC
......................................................V
IN
+ 0.3V, 8V
GATE, PWMOUT (Note 4) ......................... INTV
CC
+ 0.3V
CTRL, PWM, OPENLED .............................................12V
V
C
, V
REF
, SS, FB ..........................................................3V
SYNC ..........................................................................8V
(Note 1)
orDer inForMaTion
16 15 14 13
5 6 7 8
TOP VIEW
17
GND
UD PACKAGE
16-LEAD (3mm s 3mm) PLASTIC QFN
9
10
11
12
4
3
2
1V
REF
PWM
SYNC OR OPENLED
SS
FB
PWMOUT
GATE
SENSE
CTRL
VC
ISP
ISN
RT
SHDN/UVLO
INTV
CC
V
IN
T
JMAX
= 125°C, θ
JA
= 68°C/W, θ
JC
= 4.2°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
1
2
3
4
5
6
7
8
PWMOUT
FB
ISN
ISP
VC
CTRL
V
REF
PWM
16
15
14
13
12
11
10
9
GATE
SENSE
V
IN
INTV
CC
SHDN/UVLO
RT
SS
SYNC OR OPENLED
TOP VIEW
MSE PACKAGE
16-LEAD PLASTIC MSOP
17
GND
T
JMAX
= 125°C (E, I GRADES), T
JMAX
= 150°C (H GRADE), θ
JA
= 43°C/W, θ
JC
= 4°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
pin conFiguraTion
RT ............................................................................1.5V
SENSE ......................................................................0.5V
Operating Junction Temperature Range (Notes 2, 5)
L
T3755E/L
T3755I ...............................–40°C to 125°C
LT3755H
...........................................–40°C TO 150°C
Storage Temperature Range ...................–65°C to 150°C
Lead Temperature (Soldering, 10 sec)
MSOP ............................................................... 300°C
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3755EUD#PBF LT3755EUD#TRPBF LDGC
16-Lead (3mm × 3mm) Plastic QFN
–40°C to 125°C
LT3755IUD#PBF LT3755IUD#TRPBF LDGC
16-Lead (3mm × 3mm) Plastic QFN
–40°C to 125°C
LT3755EUD-1#PBF LT3755EUD-1#TRPBF LDMS
16-Lead (3mm × 3mm) Plastic QFN
–40°C to 125°C
LT3755IUD-1#PBF LT3755IUD-1#TRPBF LDMS
16-Lead (3mm × 3mm) Plastic QFN
–40°C to 125°C
LT3755EUD-2#PBF LT3755EUD-2#TRPBF LFJZ
16-Lead (3mm × 3mm) Plastic QFN
–40°C to 125°C
LT3755IUD-2#PBF LT3755IUD-2#TRPBF LFJZ
16-Lead (3mm × 3mm) Plastic QFN
–40°C to 125°C
LT3755EMSE#PBF LT3755EMSE#TRPBF 3755 16-Lead Plastic MSOP –40°C to 125°C
LT3755IMSE#PBF LT3755IMSE#TRPBF 3755 16-Lead Plastic MSOP –40°C to 125°C
LT3755EMSE-1#PBF LT3755EMSE-1#TRPBF 37551 16-Lead Plastic MSOP –40°C to 125°C
LT3755IMSE-1#PBF LT3755IMSE-1#TRPBF 37551 16-Lead Plastic MSOP –40°C to 125°C
LT3755EMSE-2#PBF LT3755EMSE-2#TRPBF 37552 16-Lead Plastic MSOP –40°C to 125°C
LT3755IMSE-2#PBF LT3755IMSE-2#TRPBF 37552 16-Lead Plastic MSOP –40°C to 125°C
LT3755HMSE-2#PBF LT3755HMSE-2#TRPBF 37552 16-Lead Plastic MSOP –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/
LT3755/LT3755-1/LT3755-2
3
37551fd
elecTrical characTerisTics
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 24V, SHDN/UVLO = 24V, CTRL = 2V, PWM = 5V, unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Minimum Operating Voltage V
IN
Tied to INTV
CC
l
4.5 V
V
IN
Shutdown I
Q
SHDN/UVLO = 0V, PWM = 0V
SHDN/UVLO = 1.15V, PWM = 0V
0.1 1
5
µA
µA
V
IN
Operating I
Q
(Not Switching) PWM = 0V 1.4 1.7 mA
V
REF
Voltage 100µA ≤ I
VREF
≤ 0µA
l
1.965 2.00 2.045 V
V
REF
Line Regulation 4.5V ≤ V
IN
≤ 40V 0.006 %/V
SENSE Current Limit Threshold
l
98 108 118 mV
SENSE Input Bias Current Current Out of Pin 40 µA
SS Pull-Up Current Current Out of Pin 8 10 13 µA
Error Amplifier
ISP/ISN Full-Scale Current Sense Threshold FB = 0V, ISP = 48V
l
96 100 103 mV
ISP/ISN Full-Scale Current Sense Threshold at CTRL = 0V CTRL = 0V, FB = 0V, ISP = 48V –12 –9.5 –7 mV
CTRL Pin Range for Current Sense Threshold Adjustment
l
0 1.1 V
CTRL Input Bias Current Current Out of Pin 50 100 nA
LED Current Sense Amplifier Input Common Mode Range (V
ISN
)
l
2.9 75 V
ISP/ISN Short-Circuit Threshold ISN = 0V 115 150 200 mV
ISP/ISN Short-Circuit Fault Sensing Common Mode Range (V
ISN
)
l
0 3 V
ISP/ISN Input Bias Current (Combined) PWM = 5V (Active), ISP = ISN = 48V
PWM = 0V (Standby), ISP = ISN = 48V
55
0
0.1
µA
µA
LED Current Sense Amplifier g
m
V
(ISP – ISN)
= 100mV 120 µS
VC Output Impedance 1V < VC < 2V 15000 kΩ
VC Standby Input Bias Current PWM = 0V –20 20 nA
FB Regulation Voltage (V
FB
)
ISP = ISN
l
1.232
1.220
1.250
1.250
1.265
1.270
V
V
FB Amplifier g
m
FB = V
FB
, ISP = ISN 480 µS
FB Pin Input Bias Current Current Out of Pin 40 100 nA
FB Open LED Threshold OPENLED Falling (LT3755 and LT3755-2) V
FB
–
65mV
V
FB
–
50mV
V
FB
–
40mV
V
FB Overvoltage Threshold PWMOUT Falling V
FB
+
50mV
V
FB
+
60mV
V
FB
+
75mV
V
VC Current Mode Gain – (∆V
VC
/∆V
SENSE
)
4 V/V
Oscillator
Switching Frequency R
T
= 100k
R
T
= 10k
l
90
925
100
1000
125
1050
kHz
kHz
Minimum Off-Time 170 ns
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P26

LT3755IMSE-2#TRPBF

Mfr. #:
Buy LT3755IMSE-2#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
LED Lighting Drivers 75V Full-Featured LED Controller
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
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