http://www.datasheet4u.com

900,000+ Datasheet PDF Search and Download

Datasheet4U offers most rated semiconductors datasheets pdf




Linear Technology Electronic Components Datasheet

LT3477 Datasheet

DC/DC Converter

No Preview Available !

LT3477 pdf
FEATURES
n Dual 100mV Rail-to-Rail Current Sense Amplifiers
n Wide Input Voltage Range: 2.5V to 25V
n 3A, 42V Internal Switch
n High Efficiency Power Conversion: Up to 93%
n Drives LEDs in Boost, Buck-Boost or Buck Mode
n Frequency Set by External Resistor: 200kHz to 3.5MHz
n Programmable Soft-Start
n Low VCESAT Switch: 0.3V at 2.5A
n Capable of Positive and Negative Output Voltages
(Boost, Inverting, SEPIC, Flyback)
n Available in Thermally Enhanced 20-Lead
(4mm × 4mm) QFN and 20-Lead TSSOP Packages
APPLICATIONS
n High Power LED Driver
n DSL Modems
n Distributed Power
n Input/Output Current Limited Boost, SEPIC,
Inverting, Flyback Converters
n Constant-Voltage, Constant-Current Source
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 con-
verter 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 current sense voltages are set at 100mV and can be
adjusted independently using the IADJ1 and IADJ2 pins. Ef-
ficiency of up to 91% 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 posi-
tive 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.
TYPICAL APPLICATION
330mA LED Driver With Open LED Protection
10μH
VIN
5V
3.3μF
ISP1 ISN1
SW
200k
3.3μF
VIN
IADJ1
IADJ2
FBN
10k
SHDN SHDN LT3477
ISP2
1k
4.7nF
VC
VREF
FBP
GND
ISN2
RT
SS
33nF 22k
0.3Ω
330mA
3477 TA01a
Efficiency
90
85
80
75
70
65
60
55
50
0
0.1 0.2
0.3 0.4
IOUT (A)
3477 TA01b
3477fc
1


Linear Technology Electronic Components Datasheet

LT3477 Datasheet

DC/DC Converter

No Preview Available !

LT3477 pdf
LT3477
ABSOLUTE MAXIMUM RATINGS (Note 1)
SW Pin Voltage ........................................................ 42V
VIN, SHDN Pin Voltage ............................................. 25V
FBP, FBN Pin Voltage ................................................. 6V
VREF Pin Voltage......................................................... 6V
RT, VC, SS Pin Voltage ............................................... 6V
IADJ1, IADJ2 Pin Voltage ............................................ 25V
ISP1, ISP2, ISN1, ISN2 Pin Voltage ...............................42V
Junction Temperature .......................................... 125°C
Operating Temperature Range (Note 2)
LT3477E...............................................– 40°C to 85°C
LT3477I.............................................. –40°C to 125°C
Storage Temperature Range...................– 65°C to 125°C
Lead Temperature (Soldering, 10 sec)
TSSOP .............................................................. 300°C
PIN CONFIGURATION
TOP VIEW
VIN
RT
SHDN
1
2
3
20 NC
19 NC
18 NC
SS 4
17 SW
VC 5
FBN 6
16 SW
21
15 GND
FBP 7
VREF 8
IADJ2 9
IADJ1 10
14 ISN1
13 ISP1
12 ISN2
11 ISP2
FE PACKAGE
20-LEAD PLASTIC TSSOP
TJMAX = 125°C, θJA = 40°C/W
EXPOSED PAD (PIN 21) IS PGND (MUST BE SOLDERED TO PCB)
TOP VIEW
20 19 18 17 16
NC 1
NC 2
VIN 3
RT 4
SHDN 5
15 ISP1
14 ISN2
21 13 ISP2
12 IADJ1
11 IADJ2
6 7 8 9 10
UF PACKAGE
20-LEAD (4mm × 4mm) PLASTIC QFN
TJMAX = 125°C, θJA = 37°C/W
EXPOSED PAD (PIN 21) IS PGND (MUST BE SOLDERED TO PCB)
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LT3477EFE#PBF
LT3477EFE#TRPBF
20-Lead Plastic TSSOP
LT3477IFE#PBF
LT3477IFE#TRPBF
20-Lead Plastic TSSOP
LT3477EUF#PBF
LT3477EUF#TRPBF
3477
20-Lead (4mm × 4mm) Plastic QFN
LT3477IUF#PBF
LT3477IUF#TRPBF
3477
20-Lead (4mm × 4mm) Plastic QFN
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 125°C
–40°C to 85°C
–40°C to 125°C
ELECTRICAL CHARACTERISTICS The indicates specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 2.5V, VSHDN = 2.5V.
PARAMETER
CONDITIONS
MIN TYP MAX
Minimum Input Voltage
l 2.3 2.5
Quiescent Current
Reference Voltage
VSHDN = 0V
VSHDN = 2.5V, VC = 0.3V (Not Switching)
E Grade
I Grade
l 1.216
l 1.210
0.1
5.0
1.235
1.235
1.0
7.5
1.250
1.260
Reference Voltage Line Regulation
2.5V < VIN < 25V, VC = 0.3V
0.01 0.03
2
UNITS
V
μA
mA
V
V
%/V
3477fc


Part Number LT3477
Description DC/DC Converter
Maker Linear Technology
Total Page 20 Pages
PDF Download
LT3477 pdf
Download PDF File
[partsNo] view html
View PDF for Mobile






Related Datasheet

1 LT3470 Micropower Buck Regulator Linear Integrated Systems
Linear Integrated Systems
LT3470 pdf
2 LT3470 Micropower Buck Regulator with Integrated Boost and Catch Diodes Linear Technology
Linear Technology
LT3470 pdf
3 LT3470A Micropower Buck Regulator Linear Technology
Linear Technology
LT3470A pdf
4 LT3470A Micropower Buck Regulator with Integrated Boost and Catch Diodes Linear Technology
Linear Technology
LT3470A pdf
5 LT3471 Boost/Inverter Linear Technology
Linear Technology
LT3471 pdf
6 LT3472 Boost And Inverting DC/DC Converter Linear Technology
Linear Technology
LT3472 pdf
7 LT3473 Micropower 1A Boost Converter Linear Technology
Linear Technology
LT3473 pdf
8 LT3473A Micropower 1A Boost Converter Linear Technology
Linear Technology
LT3473A pdf
9 LT3474 Step-Down 1A LED Driver Linear Technology
Linear Technology
LT3474 pdf






Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z

site map

webmaste! click here

contact us

Buy Components