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LT3477EFE#PBF

Description
LED Driver 4 Segment 7500uA Supply Current 20-Pin TSSOP EP Tube
CategoryPower/power management    The power supply circuit   
File Size541KB,22 Pages
ManufacturerADI
Websitehttps://www.analog.com
Environmental Compliance
Download Datasheet Parametric View All

LT3477EFE#PBF Overview

LED Driver 4 Segment 7500uA Supply Current 20-Pin TSSOP EP Tube

LT3477EFE#PBF Parametric

Parameter NameAttribute value
Brand NameAnalog Devices Inc
Is it lead-free?Contains lead
Is it Rohs certified?conform to
MakerADI
package instructionTSSOP-20
Contacts20
Manufacturer packaging code05-08-1663 (CB)
Reach Compliance Codecompliant
Analog Integrated Circuits - Other TypesSWITCHING REGULATOR
control modeCURRENT-MODE
Control TechnologyPULSE WIDTH MODULATION
Maximum input voltage25 V
Minimum input voltage2.5 V
Nominal input voltage2.5 V
JESD-30 codeR-PDSO-G20
JESD-609 codee3
length6.5 mm
Humidity sensitivity level1
Number of functions1
Number of terminals20
Maximum operating temperature70 °C
Minimum operating temperature
Maximum output current5 A
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 height1.2 mm
surface mountYES
Switch configurationBUCK-BOOST
Maximum switching frequency4300 kHz
Temperature levelCOMMERCIAL
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
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LT3477
3A, DC/DC Converter
with Dual Rail-to-Rail
Current Sense
DescripTion
The
LT
®
3477
is a current mode, 3A DC/DC step-up converter
with dual rail-to-rail current sense amplifiers and an internal
3A, 42V switch. It combines a traditional voltage feedback
loop and two unique current feedback loops to operate
as a constant-current, constant-voltage source. Both cur-
rent sense voltages are set at 100mV and can be adjusted
independently using the I
ADJ1
and I
ADJ2
pins. Efficiency
of up to 93% can be achieved in typical applications. The
LT3477 features a programmable soft-start function to
limit inductor current during start-up. Both inputs of the
error amplifier are available externally allowing positive
and negative output voltages (boost, inverting, SEPIC,
Flyback). The switching frequency is programmable from
200kHz to 3.5MHz through an external resistor.
Available in thermally enhanced 20-pin (4mm
×
4mm)
QFN and 20-pin TSSOP packages, the LT3477 provides a
complete solution for both constant-voltage and constant-
current applications.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
n
Dual 100mV Rail-to-Rail Current Sense Amplifiers
Wide Input Voltage Range: 2.5V to 25V
3A, 42V Internal Switch
High Efficiency Power Conversion: Up to 93%
Drives LEDs in Boost, Buck-Boost or Buck Mode
Frequency Set by External Resistor: 200kHz to 3.5MHz
Programmable Soft-Start
Low V
CESAT
Switch: 0.3V at 2.5A
Capable of Positive and Negative Output Voltages
(Boost, Inverting, SEPIC, Flyback)
Available in Thermally Enhanced 20-Lead
(4mm
×
4mm) QFN and 20-Lead TSSOP Packages
applicaTions
n
n
n
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High Power LED Driver
DSL Modems
Distributed Power
Input/Output Current Limited Boost, SEPIC,
Inverting, Flyback Converters
Constant-Voltage, Constant-Current Source
Typical applicaTion
330mA LED Driver With Open LED Protection
V
IN
5V
10µH
3.3µF
200k
FBN
10k
LT3477
I
SP2
0.3
V
C
V
REF
1k
FBP
GND
SS
33nF
22k
I
SN2
R
T
330mA
3.3µF
Efficiency
90
I
SP1
V
IN
I
ADJ1
I
ADJ2
I
SN1
SW
85
80
EFFICIENCY (%)
75
70
65
60
55
50
0
0.1
0.2
I
OUT
(A)
3477 TA01b
SHDN
SHDN
0.3
0.4
4.7nF
3477 TA01a
3477fd
For more information
www.linear.com/LT3477
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