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LT3478IFE-1#PBF

Description
IC LED DRIVER RGLTR DIM 16TSSOP
CategoryAnalog mixed-signal IC    Drivers and interfaces   
File Size268KB,24 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Environmental Compliance
Download Datasheet Parametric View All

LT3478IFE-1#PBF Overview

IC LED DRIVER RGLTR DIM 16TSSOP

LT3478IFE-1#PBF Parametric

Parameter NameAttribute value
Brand NameLinear Technology
Is it Rohs certified?conform to
MakerLinear ( ADI )
Parts packaging codeTSSOP
package instructionHTSSOP, TSSOP16,.25
Contacts16
Manufacturer packaging codeFE
Reach Compliance Codecompliant
ECCN codeEAR99
Samacsys DescriptionLED Lighting Drivers 4.5A 42V, 2.25MHz Boost LED Driver w/ True Color PWM Dimming
Interface integrated circuit typeLED DISPLAY DRIVER
JESD-30 codeR-PDSO-G16
JESD-609 codee3
length5 mm
Humidity sensitivity level1
Multiplex display functionNO
Number of functions1
Number of segments6
Number of terminals16
Maximum operating temperature125 °C
Minimum operating temperature-40 °C
Package body materialPLASTIC/EPOXY
encapsulated codeHTSSOP
Encapsulate equivalent codeTSSOP16,.25
Package shapeRECTANGULAR
Package formSMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH
Peak Reflow Temperature (Celsius)260
power supply3/36 V
Certification statusNot Qualified
Maximum seat height1.1 mm
Maximum supply voltage36 V
Minimum supply voltage2.8 V
Nominal supply voltage2.7 V
surface mountYES
technologyBIPOLAR
Temperature levelAUTOMOTIVE
Terminal surfaceMatte Tin (Sn)
Terminal formGULL WING
Terminal pitch0.65 mm
Terminal locationDUAL
Maximum time at peak reflow temperature30
width4.4 mm
Base Number Matches1
FEATURES
LT3478/LT3478-1
4.5A Monolithic LED
Drivers with True Color
PWM Dimming
DESCRIPTIO
The LT
®
3478/LT3478-1 are 4.5A step-up DC/DC convert-
ers designed to drive LEDs with a constant current over
a wide programmable range. Series connection of the
LEDs provides identical LED currents for uniform bright-
ness without the need for ballast resistors and expensive
factory calibration.
The LT3478-1 reduces external component count and cost
by integrating the LED current sense resistor. The LT3478
uses an external sense resistor to extend the maximum
programmable LED current beyond 1A and also to achieve
greater accuracy when programming low LED currents.
Operating frequency can be set with an external resistor
from 200kHz up to 2.25MHz. Unique circuitry allows a
PWM dimming range up to 3000:1 while maintaining
constant LED color. The LT3478/LT3478-1 are ideal for
high power LED driver applications such as automotive TFT
LCD backlights, courtesy lighting and heads-up displays.
One of two CTRL pins can be used to program maximum
LED current. The other CTRL pin can be used to program
a reduction in maximum LED current vs temperature to
maximize LED usage and improve reliability.
Additional features include inrush current protection,
programmable open LED protection and programmable
soft-start. Each part is available in a 16-pin thermally
enhanced TSSOP Package.
True Color PWM™ Dimming Delivers Constant LED
Color with Up to 3000:1 Range
Wide Input Voltage Range: 2.8V to 36V
4.5A, 60mΩ, 42V Internal Switch
Drives LEDs in Boost, Buck-Boost or Buck Modes
Integrated Resistors for Inductor and LED Current
Sensing
Program LED Current:
100mA to 1050mA (LT3478-1)
(10mV to 105mV)/R
SENSE
(LT3478)
Program LED Current De-Rating vs Temperature
Separate Inductor Supply Input
Inrush Current Protection
Programmable Soft-Start
Fixed Frequency Operation from 200kHz to 2.25MHz
Open LED Protection (Programmable OVP)
Accurate Shutdown/UVLO Threshold with
Programmable Hysteresis
16-Pin Thermally Enhanced TSSOP Package
APPLICATIO S
High Power LED Driver
Automotive Lighting
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners. Patents Pending.
TYPICAL APPLICATIO
V
IN
8V TO 16V
4.7µF
V
IN
SHDN
V
REF
45.3k
CTRL2
OVPSET
54.9k
CTRL1
130k
PWM
1µF
PWM DIMMING
CONTROL
SS
V
S
Automotive TFT LCD Backlight
10µH
L
SW
OUT
0.1Ω
R
SENSE
(LT3478)
10µF
95
EFFICIENCY (%)
100
Efficiency vs V
IN
I
LED
= 700mA
f
OSC
= 500kHz
PWM DUTY CYCLE = 100%
LT3478-1
LED
90
85
700mA
15W
6 LEDs
(WHITE)
69.8k
V
C
0.1µF
R
T
80
8
10
3478 TA01
U
U
U
6 LEDs LUXEON III (WHITE)
12
V
IN
(V)
14
16
3478 TA01b
34781f
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