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LT3755IUD-2#PBF

Description
IC LED DRIVER CTRLR DIM 16QFN
CategoryAnalog mixed-signal IC    Drivers and interfaces   
File Size340KB,26 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Environmental Compliance
Download Datasheet Parametric View All

LT3755IUD-2#PBF Overview

IC LED DRIVER CTRLR DIM 16QFN

LT3755IUD-2#PBF Parametric

Parameter NameAttribute value
Brand NameLinear Technology
Is it Rohs certified?conform to
Parts packaging codeQFN
package instructionHVQCCN, LCC16,.12SQ,20
Contacts16
Manufacturer packaging codeUD
Reach Compliance Codecompliant
ECCN codeEAR99
Is SamacsysN
Interface integrated circuit typeLED DISPLAY DRIVER
JESD-30 codeS-PQCC-N16
JESD-609 codee3
length3 mm
Humidity sensitivity level1
Multiplex display functionNO
Number of functions1
Number of segments14
Number of terminals16
Maximum operating temperature125 °C
Minimum operating temperature-40 °C
Package body materialPLASTIC/EPOXY
encapsulated codeHVQCCN
Encapsulate equivalent codeLCC16,.12SQ,20
Package shapeSQUARE
Package formCHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE
Peak Reflow Temperature (Celsius)260
power supply24 V
Certification statusNot Qualified
Maximum seat height0.8 mm
Maximum supply voltage40 V
Minimum supply voltage4.5 V
Nominal supply voltage24 V
surface mountYES
technologyBIPOLAR
Temperature levelAUTOMOTIVE
Terminal surfaceMatte Tin (Sn)
Terminal formNO LEAD
Terminal pitch0.5 mm
Terminal locationQUAD
Maximum time at peak reflow temperature30
width3 mm
Base Number Matches1
LT3755/LT3755-1/LT3755-2
40V
IN
, 75V
OUT
LED Controllers
FeaTures
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
DescripTion
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.
applicaTions
n
n
n
High Power LED
Battery Chargers
Accurate Current Limited Voltage Regulators
Typical applicaTion
50W White Automotive LED Headlamp Driver
V
IN
8V TO
40V
22µH
4.7µF
1M
185k
V
IN
SHDN/UVLO
V
REF
332k
CTRL
INTV
CC
100k
40.2k
LT3755-2
ISN
GATE
OPENLED
PWM
SS
PWMOUT
RT
V
C
GND INTV
CC
10k
0.001µF
37551 TA01a
Efficiency vs V
IN
100
1M
4.7µF
FB
ISP
0.1
1A
23.7k
96
EFFICIENCY (%)
50W
LED
STRING
92
SENSE
88
0.015
84
80
0.01µF
28.7k
375kHz
4.7µF
0
10
20
V
IN
(V)
30
40
37551 TA01b
37551fd

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