FB Voltage ...................................................................6V
SHDN
Voltage ...........................................................40V
BD Voltage ..................................................................7V
Operating Junction Temperature Range (Note 2)
LT3502AE, LT3502E .......................... –40°C to 125°C
LT3502AI, LT3502I ............................ –40°C to 125°C
Storage Temperature Range .................. –65°C to 150°C
pin conFiguration
TOP VIEW
V
IN
1
BD 2
FB 3
SHDN
4
9
8 SW
7 BOOST
6 DA
5 GND
SW
BOOST
NC
DA
GND
1
2
3
4
5
TOP VIEW
10
9
8
7
6
V
IN
NC
BD
FB
SHDN
DC PACKAGE
8-LEAD (2mm
×
2mm) PLASTIC DFN
θ
JA
= 102°C/W
EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB
MS PACKAGE
10-LEAD PLASTIC MSOP
θ
JA
= 110°C/W
orDer inForMation
LEAD FREE FINISH
LT3502EDC#PBF
LT3502IDC#PBF
LT3502AEDC#PBF
LT3502AIDC#PBF
LT3502EMS#PBF
LT3502IMS#PBF
LT3502AEMS#PBF
LT3502AIMS#PBF
TAPE AND REEL
LT3502EDC#TRPBF
LT3502IDC#TRPBF
LT3502AEDC#TRPBF
LT3502AIDC#TRPBF
LT3502EMS#TRPBF
LT3502IMS#TRPBF
LT3502AEMS#TRPBF
LT3502AIMS#TRPBF
PART MARKING*
LCLV
LCLV
LCLT
LCLT
LTDTR
LTDTR
LTDTS
LTDTS
PACKAGE DESCRIPTION
8-Lead 2mm
×
2mm Plastic DFN
8-Lead 2mm
×
2mm Plastic DFN
8-Lead 2mm
×
2mm Plastic DFN
8-Lead 2mm
×
2mm Plastic DFN
10-Lead Plastic MSOP
10-Lead Plastic MSOP
10-Lead Plastic MSOP
10-Lead Plastic MSOP
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
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/
2
3502fd
LT3502/LT3502A
electrical characteristics
PARAMETER
Undervoltage Lockout
Quiescent Current at Shutdown
Quiescent Current
Feedback Voltage
V
SHDN
= 0V
Not Switching
2mm
×
2mm DFN
2mm
×
2mm DFN
MS10
MS10
(Note 5)
I
DA
< 500mA (LT3502A)
I
DA
< 500mA (LT3502A)
I
DA
< 500mA (LT3502)
I
DA
< 500mA (LT3502)
100mA Load (LT3502A)
100mA Load (LT3502)
I
SW
= 500mA
(Note 3)
SW = 10V (Note 4)
SW = 0V (Note 5)
I
SW
= 500mA
I
SW
= 500mA
I
OUT
= 100mA
500
V
SHDN
= 5V
V
SHDN
= 0V
2
0.3
0.75
l
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 10V, V
SHDN
= 5V, V
BOOST
= 15V.
CONDITIONS
MIN
2.6
TYP
2.8
0.5
1.5
0.785
0.79
0.780
0.786
0.8
0.8
0.8
0.8
0.005
l
l
l
MAX
3
2
2
0.813
0.81
0.816
0.813
50
2.7
2.8
1.3
1.4
UNITS
V
µA
mA
V
V
V
V
%/V
nA
MHz
MHz
MHz
MHz
%
%
mV
Reference Voltage Line Regulation
FB Pin Bias Current
Switching Frequency
1.9
1.8
0.9
0.8
70
80
15
2.25
2.25
1.1
1.1
80
90
450
0.9
95
8
10
1.9
0.8
650
55
Maximum Duty Cycle
Switch V
CESAT
Switch Current Limit
Switch Active Current
BOOST Pin Current
Minimum BOOST Voltage Above Switch
BOOST Schottky Forward Drop
DA Pin Current to Stop OSC
SHDN
Bias Current
SHDN
Input Voltage High
SHDN
Input Voltage Low
1.1
130
30
13
2.2
1
80
1
A
µA
µA
mA
V
V
mA
µA
µA
V
V
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 LT3502EDC and LT3502AEDC are guaranteed to meet
performance specifications from 0°C to 125°C junction temperature
range. Specifications over the –40°C to 125°C operating junction
temperature range are assured by design, characterization and correlation
with statistical process controls. The LT3502IDC and LT3502AIDC are
guaranteed over the – 40°C to 125°C operating junction temperature
range.
Note 3:
Current limit guaranteed by design and/or correlation to static test.
Slope compensation reduces current limit at higher duty cycle.
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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