LT3756/LT3756-1/LT3756-2
100V , 100V
IN OUT
LED Controller
Fae Tseru Dpircse Tnoi
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3000:1 True Color PWM Dimming The LT 3756, LT3756-1 and LT3756-2 are DC/DC control-
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Wide Input Voltage Range: 6V to 100V lers designed to operate as a constant-current source for
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Output Voltage Up to 100V driving high current LEDs. They drive a low side external
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Constant-Current and Constant-Voltage Regulation N-channel power MOSFET from an internal regulated 7.15V
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100mV High Side Current Sense supply. The fixed frequency, current-mode architecture
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Drives LEDs in Boost, Buck Mode, Buck-Boost Mode, results in stable operation over a wide range of supply
SEPIC or Flyback Topology and output voltages. A ground referenced voltage FB pin
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Adjustable Frequency: 100kHz to 1MHz serves as the input for several LED protection features,
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Open LED Protection and also makes it possible for the converter to operate
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Programmable Undervoltage Lockout with Hysteresis as a constant-voltage source. A frequency adjust pin
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Improved Open LED Status Pin (LT3756-2) allows the user to program the frequency from 100kHz
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Frequency Synchronization (LT3756-1) to 1MHz to optimize efficiency, performance or external
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PWM Disconnect Switch Driver component size.
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CTRL Pin Provides Analog Dimming
The LT3756/LT3756-1/LT3756-2 sense output current at
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Low Shutdown Current: <1A
the high side of the LED string. High side current sensing
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Programmable Soft-Start
is the most flexible scheme for driving LEDs, allowing
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Thermally Enhanced 16-Lead QFN (3mm 3mm)
boost, buck mode or buck-boost mode configuration.
and MSOP Packages
The PWM input provides LED dimming ratios of up to
3000:1, and the CTRL input provides additional analog
a acilpp Tsnoi
dimming capability.
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High Power LED Applications
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.
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Current Limited Constant Voltage Applications
All other trademarks are the property of their respective owners.
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Protected by U.S. Patents, including 7199560 and 7321203.
Battery Charging
T lacipy a acilpp Tnoi
94% Efficient 30W White LED Headlamp Driver
Efficiency vs V
IN
V
IN
8V TO 60V
100
22H
(100V TRANSIENT)
4.7F
4.7F 1M
1M
V
IN
96
SHDN/UVLO FB
V ISP
185k REF
14k
332k
LT3756-2 92
0.27
370mA
CTRL
ISN
INTV
CC
40.2k
88
GATE
100k
SENSE
OPENLED
30W
0.018
84
PWM
LED
SS STRING
RT PWMOUT
0.01F V GND INTV 80
C CC
28.7k
0 20 40 60 80
375kHz
INTV V (V)
10k IN
CC
1%
375612 TA01b
0.001F 4.7F
375612 TA01a
375612fb
EFFICIENCY (%)LT3756/LT3756-1/LT3756-2
a ulosb T e Mixa Mu M r a Tsgni (Note 1)
V ..........................................................................100V RT ............................................................................1.5V
IN
SHDN/UVLO ............................................................100V SENSE ......................................................................0.5V
ISP, ISN ...................................................................100V Operating Junction Temperature Range (Notes 2, 3)
INTV ...................................................... V + 0.3V, 8V LT3756E, LT3756I ..............................40C to 125C
CC IN
GATE, PWMOUT (Note 4) ..........................INTV + 0.3V LT3756H ............................................ 40C to 150C
CC
CTRL, PWM, OPENLED .............................................12V Storage Temperature Range ...................65C to 150C
VC, V , SS, FB .........................................................3V Lead Temperature (Soldering, 10 sec)
REF
SYNC ..........................................................................8V MSE .................................................................. 300C
p ni c no Farugi Tnoi
TOP VIEW
16 15 14 13
TOP VIEW
V 1 12 FB
PWMOUT 1 16 GATE REF
FB 2 15 SENSE
PWM 2 11 PWMOUT
17
ISN 3 14 V
IN
GND
ISP 4 13 INTV SYNC OR OPENLED GATE
17 3 10
CC
VC 5 12 SHDN/UVLO
GND
SS 4 9 SENSE
CTRL 6 11 RT
V 7 10 SS
REF
5 6 7 8
PWM 8 9 SYNC OR OPENLED
MSE PACKAGE
16-LEAD PLASTIC MSOP
T = 125C (E-,I-GRADES), T = 150C (H-GRADE), = 43C/W, = 4C/W
JMAX JMAX JA JC
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
UD PACKAGE
16-LEAD (3mm 3mm) PLASTIC QFNs
T = 125C, = 68C/W, = 4.2C/W
JMAX JA JC
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
o r D re i n Fro Ma Tnoi
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3756EMSE#PBF LT3756EMSE#TRPBF 3756 16-Lead Plastic MSOP 40C to 125C
LT3756IMSE#PBF LT3756IMSE#TRPBF 3756 16-Lead Plastic MSOP 40C to 125C
LT3756EMSE-1#PBF LT3756EMSE-1#TRPBF 37561 16-Lead Plastic MSOP 40C to 125C
LT3756IMSE-1#PBF LT3756IMSE-1#TRPBF 37561 16-Lead Plastic MSOP 40C to 125C
LT3756EMSE-2#PBF LT3756EMSE-2#TRPBF 37562 16-Lead Plastic MSOP 40C to 125C
LT3756IMSE-2#PBF LT3756IMSE-2#TRPBF 37562 16-Lead Plastic MSOP 40C to 125C
LT3756HMSE-2#PBF LT3756HMSE-2#TRPBF 37562 16-Lead Plastic MSOP 40C to 150C
LT3756EUD#PBF LT3756EUD#TRPBF LDMQ 40C to 125C
16-Lead (3mm 3mm) Plastic QFN
LT3756IUD#PBF LT3756IUD#TRPBF LDMQ 16-Lead (3mm 3mm) Plastic QFN 40C to 125C
LT3756EUD-1#PBF LT3756EUD-1#TRPBF LDMR 16-Lead (3mm 3mm) Plastic QFN 40C to 125C
LT3756IUD-1#PBF LT3756IUD-1#TRPBF LDMR 16-Lead (3mm 3mm) Plastic QFN 40C to 125C
LT3756EUD-2#PBF LT3756EUD-2#TRPBF LFKB 16-Lead (3mm 3mm) Plastic QFN 40C to 125C
LT3756IUD-2#PBF LT3756IUD-2#TRPBF LFKB 16-Lead (3mm 3mm) Plastic QFN 40C to 125C
Consult LTC Marketing for parts speciefi d with wider operating temperature ranges. *The temperature grade is identiefi d by a label on the shipping container.
For more information on lead free part marking, go to: