LT3481E............................................... –40°C to 85°C
LT3481I.............................................. –40°C to 125°C
LT3481H ............................................ –40°C to 150°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
MSE Only .......................................................... 300°C
PIN CONFIGURATION
TOP VIEW
TOP VIEW
BD
BOOST
SW
V
IN
RUN/SS
1
2
3
4
5
11
10 RT
9 V
C
8 FB
7 BIAS
6 PG
BD
BOOST
SW
V
IN
RUN/SS
1
2
3
4
5
10
9
8
7
6
RT
V
C
FB
BIAS
PG
11
DD PACKAGE
10-LEAD (3mm 3mm) PLASTIC DFN
EXPOSED PAD (PIN 11) IS GND
MUST BE CONNECTED TO GND
θ
JA
= 43°C/W
MSE PACKAGE
10-LEAD PLASTIC MSOP
EXPOSED PAD (PIN 11) IS GND
MUST BE CONNECTED TO GND
θ
JA
= 40°C/W
ORDER INFORMATION
LEAD FREE FINISH
LT3481EDD#PBF
LT3481IDD#PBF
LT3481HDD#PBF
LT3481EMSE#PBF
LT3481IMSE#PBF
LT3481HMSE#PBF
LEAD BASED FINISH
LT3481EDD
LT3481IDD
LT3481HDD
LT3481EMSE
LT3481IMSE
LT3481HMSE
TAPE AND REEL
LT3481EDD#TRPBF
LT3481IDD#TRPBF
LT3481HDD#TRPBF
LT3481EMSE#TRPBF
LT3481IMSE#TRPBF
LT3481HMSE#TRPBF
TAPE AND REEL
LT3481EDD#TR
LT3481IDD#TR
LT3481HDD#TR
LT3481EMSE#TR
LT3481IMSE#TR
LT3481HMSE#TR
PART MARKING*
LBVS
LBVV
LBVS
LTBVT
LTBVW
LTBVT
PART MARKING*
LBVS
LBVV
LBVS
LTBVT
LTBVW
LTBVT
PACKAGE DESCRIPTION
10-Lead (3mm
×
3mm) Plastic DFN
10-Lead (3mm
×
3mm) Plastic DFN
10-Lead (3mm
×
3mm) Plastic DFN
10-Lead Plastic MSOP
10-Lead Plastic MSOP
10-Lead Plastic MSOP
PACKAGE DESCRIPTION
10-Lead (3mm
×
3mm) Plastic DFN
10-Lead (3mm
×
3mm) Plastic DFN
10-Lead (3mm
×
3mm) Plastic DFN
10-Lead Plastic MSOP
10-Lead Plastic MSOP
10-Lead Plastic MSOP
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 125°C
–40°C to 150°C
–40°C to 85°C
–40°C to 125°C
–40°C to 150°C
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 125°C
–40°C to 150°C
–40°C to 85°C
–40°C to 125°C
–40°C to 150°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
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/
3481fc
2
LT3481
ELECTRICAL CHARACTERISTICS
PARAMETER
Minimum Input Voltage
Quiescent Current from V
IN
V
RUN/SS
= 0.2V
V
BIAS
= 3V, Not Switching
V
BIAS
= 0, Not Switching
Quiescent Current from BIAS
V
RUN/SS
= 0.2V
V
BIAS
= 3V, Not Switching
V
BIAS
= 0, Not Switching
Minimum Bias Voltage
Feedback Voltage
●
●
●
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 10V, V
RUNS/SS
= 10V V
BOOST
= 15V, V
BIAS
= 3.3V unless otherwise
noted. (Note 2)
CONDITIONS
●
MIN
TYP
3
0.01
22
75
0.01
50
0
2.7
MAX
3.6
0.5
60
120
0.5
120
5
3
1.29
1.3
100
0.02
UNITS
V
μA
μA
μA
μA
μA
μA
V
V
V
nA
%/V
μMho
μA
μA
A/V
V
1.25
1.24
1.265
1.265
30
0.002
330
800
65
85
3.5
2
FB Pin Bias Current (Note 3)
FB Voltage Line Regulation
Error Amp g
m
Error Amp Gain
V
C
Source Current
V
C
Sink Current
V
C
Pin to Switch Current Gain
V
C
Clamp Voltage
Switching Frequency
V
FB
= 1.25V, V
C
= 0.4V
4V < V
IN
< 34V
●
R
T
= 8.66k
R
T
= 29.4k
R
T
= 187k
●
2.5
1.25
250
3.2
2.8
1.4
300
130
3.8
360
0.02
3.1
1.55
350
200
4.4
2
2.1
35
10
0.2
MHz
MHz
kHz
nS
A
mV
μA
V
mA
μA
V
V
mV
mV
Minimum Switch Off-Time
Switch Current Limit
Switch V
CESAT
Boost Schottky Reverse Leakage
Minimum Boost Voltage (Note 4)
BOOST Pin Current
RUN/SS Pin Current
RUN/SS Input Voltage High
RUN/SS Input Voltage Low
PG Threshold Offset from Feedback Voltage
PG Hysteresis
PG Leakage
PG Sink Current
V
PG
= 5V
V
PG
= 3V
V
FB
Rising
I
SW
= 1A
V
RUN/SS
= 2.5V
Duty Cycle = 5%
I
SW
= 2A
V
SW
= 10V, V
BIAS
= 0V
●
1.5
18
5
2.5
122
5
0.1
1
μA
μA
●
100
600
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
The LT3481E is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls. The LT3481I specifications are
guaranteed over the –40°C to 125°C temperature range. The LT3481H
specifications are guaranteed over the –40°C to 150°C operating
temperature range. High junction temperatures degrade operating
lifetimes. Operating lifetime is derated at junction temperatures greater
than 125°C.
Note 3:
Bias current flows into the FB pin.
Note 4:
This is the minimum voltage across the boost capacitor needed
白光LED光衰原因之荧光粉性能的衰退 到目前，白光 LED、尤其是小功率白光 LED 的发光性能快速衰退已越来越为人们所认识。其实，盲目地夸大宣传，只能将 LED 行业引向歧途，不正视白光 LED 存在的问题，只能延缓白光 LED 应用的发展。只有正视问题、研究问题、尽早解决问题，白光 LED 才能健康、快速发展。 白光 LED 当前面临的一个主要问题就寿命问题。由于白光 LED 的价格尚很...[详细]
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