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LT3474IFE#PBF

Description
IC led drvr HP cons curr 16tssop
CategoryAnalog mixed-signal IC    Drivers and interfaces   
File Size212KB,20 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Environmental Compliance
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LT3474IFE#PBF Overview

IC led drvr HP cons curr 16tssop

LT3474IFE#PBF Parametric

Parameter NameAttribute value
Brand NameLinear Technology
Is it Rohs certified?conform to
MakerLinear ( ADI )
Parts packaging codeTSSOP
package instructionHTSSOP,
Contacts16
Manufacturer packaging codeFE
Reach Compliance Codecompliant
ECCN codeEAR99
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 segments1
Number of terminals16
Maximum operating temperature125 °C
Minimum operating temperature-40 °C
Package body materialPLASTIC/EPOXY
encapsulated codeHTSSOP
Package shapeRECTANGULAR
Package formSMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH
Peak Reflow Temperature (Celsius)260
Certification statusNot Qualified
Maximum seat height1.1 mm
Maximum supply voltage36 V
Minimum supply voltage4 V
Nominal supply voltage12 V
surface mountYES
Temperature levelAUTOMOTIVE
Terminal surfaceMatte Tin (Sn)
Terminal formGULL WING
Terminal pitch0.65 mm
Terminal locationDUAL
Maximum time at peak reflow temperature30
width4.4 mm
LT3474/LT3474-1
Step-Down
1A LED Driver
FEATURES
n
n
n
n
n
n
n
n
n
n
n
n
DESCRIPTION
The LT
®
3474/LT3474-1 are fixed frequency step-down
DC/DC converters designed to operate as constant-current
sources. An internal sense resistor monitors the output
current allowing accurate current regulation, ideal for
driving high current LEDs. High output current accuracy
is maintained over a wide current range, from 35mA to
1A, allowing a wide dimming range.
Unique PWM circuitry allows a dimming range of 400:1,
avoiding the color shift normally associated with LED
current dimming.
The high switching frequency offers several advantages,
permitting the use of small inductors and ceramic capaci-
tors. Small inductors combined with the 16-lead TSSOP
surface mount package save space and cost versus
alternative solutions. The constant switching frequency
combined with low-impedance ceramic capacitors result
in low, predictable output ripple.
With their wide input range of 4V to 36V, the LT3474/
LT3474-1 regulate a broad array of power sources, from
5V logic rails to unregulated wall transformers, lead acid
batteries and distributed power supplies. A current mode
PWM architecture provides fast transient response and
cycle-by-cycle current limiting. Frequency foldback and
thermal shutdown provide additional protection.
True Color PWM™ Delivers Constant Color with
400:1 Dimming Range
Wide Input Range: 4V to 36V
Up to 1A LED Current
Adjustable 200kHz–2MHz Switching Frequency
Adjustable Control of LED Current
Integrated Boost Diode
High Output Current Accuracy is Maintained
Over a Wide Range from 35mA to 1A
Open LED (LT3474) and Short-Circuit Protection
High Side Sense Allows Grounded
Cathode Connection
Uses Small Inductors and Ceramic Capacitors
LT3474-1 Drives LED Strings Up to 26V
Compact 16-Lead TSSOP Thermally Enhanced
Surface Mount Package
APPLICATIONS
Automotive and Avionic Lighting
Architectural Detail Lighting
Display Backlighting
Constant Current Sources
L,
LT, LTC and LTM 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. Patent Pending
TYPICAL APPLICATION
Step-Down 1A LED Driver
V
IN
5V TO 36V
2.2μF
V
IN
SHDN
LT3474
R
T
REF
80.6k
0.1μF
V
ADJ
V
C
GND
LED1
55
*SEE APPLICATIONS SECTION FOR DETAILS
3474 TA01a
Efficiency
95
0.22μF
EFFICIENCY (%)
10μH
90
85
80
ONE WHITE 1A LED
75
70
65
60
0
200
800
600
LED CURRENT (mA)
400
1000
3474 G02
V
IN
= 12V
TWO SERIES CONNECTED
WHITE 1A LEDS
BOOST
SW
BIAS
OUT
PWM
LED
DIMMING*
CONTROL
2.2μF
3474fd
1

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Description IC led drvr HP cons curr 16tssop IC led drvr HP cons curr 16tssop IC LED DRVR RGLTR DIM 1A 16TSSOP IC LED DRVR RGLTR DIM 1A 16TSSOP IC LED DRVR RGLTR DIM 1A 16TSSOP IC LED DRVR RGLTR DIM 1A 16TSSOP IC LED DRVR RGLTR DIM 1A 16TSSOP IC LED DRVR RGLTR DIM 1A 16TSSOP
Brand Name Linear Technology Linear Technology Linear Technology Linear Technology Linear Technology Linear Technology Linear Technology Linear Technology
Is it Rohs certified? conform to conform to conform to conform to conform to conform to conform to conform to
Maker Linear ( ADI ) Linear ( ADI ) Linear ( ADI ) Linear ( ADI ) Linear ( ADI ) Linear ( ADI ) Linear ( ADI ) Linear ( ADI )
Parts packaging code TSSOP TSSOP TSSOP TSSOP TSSOP TSSOP TSSOP TSSOP
package instruction HTSSOP, HTSSOP, HTSSOP, HTSSOP, HTSSOP, HTSSOP, HTSSOP, HTSSOP,
Contacts 16 16 16 16 16 16 16 16
Manufacturer packaging code FE FE FE FE FE FE FE FE
Reach Compliance Code compliant compliant compliant compliant compliant compliant compliant compliant
ECCN code EAR99 EAR99 EAR99 EAR99 EAR99 EAR99 EAR99 EAR99
Interface integrated circuit type LED DISPLAY DRIVER LED DISPLAY DRIVER LED DISPLAY DRIVER LED DISPLAY DRIVER LED DISPLAY DRIVER LED DISPLAY DRIVER LED DISPLAY DRIVER LED DISPLAY DRIVER
JESD-30 code R-PDSO-G16 R-PDSO-G16 R-PDSO-G16 R-PDSO-G16 R-PDSO-G16 R-PDSO-G16 R-PDSO-G16 R-PDSO-G16
JESD-609 code e3 e3 e3 e3 e3 e3 e3 e3
length 5 mm 5 mm 5 mm 5 mm 5 mm 5 mm 5 mm 5 mm
Humidity sensitivity level 1 1 1 1 1 1 1 1
Multiplex display function NO NO NO NO NO NO NO NO
Number of functions 1 1 1 1 1 1 1 1
Number of segments 1 1 1 1 1 1 1 1
Number of terminals 16 16 16 16 16 16 16 16
Maximum operating temperature 125 °C 85 °C 85 °C 85 °C 85 °C 125 °C 125 °C 125 °C
Minimum operating temperature -40 °C -40 °C -40 °C -40 °C -40 °C -40 °C -40 °C -40 °C
Package body material PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY
encapsulated code HTSSOP HTSSOP HTSSOP HTSSOP HTSSOP HTSSOP HTSSOP HTSSOP
Package shape RECTANGULAR RECTANGULAR RECTANGULAR RECTANGULAR RECTANGULAR RECTANGULAR RECTANGULAR RECTANGULAR
Package form SMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH SMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH SMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH SMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH SMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH SMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH SMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH SMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH
Peak Reflow Temperature (Celsius) 260 260 260 260 260 260 260 260
Certification status Not Qualified Not Qualified Not Qualified Not Qualified Not Qualified Not Qualified Not Qualified Not Qualified
Maximum seat height 1.1 mm 1.1 mm 1.1 mm 1.1 mm 1.1 mm 1.1 mm 1.1 mm 1.1 mm
Maximum supply voltage 36 V 36 V 36 V 36 V 36 V 36 V 36 V 36 V
Minimum supply voltage 4 V 4 V 4 V 4 V 4 V 4 V 4 V 4 V
Nominal supply voltage 12 V 12 V 12 V 12 V 12 V 12 V 12 V 12 V
surface mount YES YES YES YES YES YES YES YES
Temperature level AUTOMOTIVE INDUSTRIAL INDUSTRIAL INDUSTRIAL INDUSTRIAL AUTOMOTIVE AUTOMOTIVE AUTOMOTIVE
Terminal surface Matte Tin (Sn) Matte Tin (Sn) Matte Tin (Sn) Matte Tin (Sn) Matte Tin (Sn) Matte Tin (Sn) Matte Tin (Sn) Matte Tin (Sn)
Terminal form GULL WING GULL WING GULL WING GULL WING GULL WING GULL WING GULL WING GULL WING
Terminal pitch 0.65 mm 0.65 mm 0.65 mm 0.65 mm 0.65 mm 0.65 mm 0.65 mm 0.65 mm
Terminal location DUAL DUAL DUAL DUAL DUAL DUAL DUAL DUAL
Maximum time at peak reflow temperature 30 30 30 30 30 30 30 30
width 4.4 mm 4.4 mm 4.4 mm 4.4 mm 4.4 mm 4.4 mm 4.4 mm 4.4 mm
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