EXPOSED PAD (PIN 15) IS GND, MUST BE SOLDERED TO PCB
MSE PACKAGE
16-LEAD PLASTIC MSOP
θ
JA
= 43°C/W,
θ
JC
= 4.3°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
orDer inForMaTion
LEAD FREE FINISH
LT3509EDE#PBF
LT3509IDE#PBF
LT3509EMSE#PBF
LT3509IMSE#PBF
LT3509HMSE#PBF
TAPE AND REEL
LT3509EDE#TRPBF
LT3509IDE#TRPBF
LT3509EMSE#TRPBF
LT3509IMSE#TRPBF
LT3509HMSE#TRPBF
PART MARKING*
3509
3509
3509
3509
3509
PACKAGE DESCRIPTION
14-Lead (4mm
×
3mm) Plastic DFN
14-Lead (4mm
×
3mm) Plastic DFN
16-Lead Plastic MSOP with Exposed Pad
16-Lead Plastic MSOP with Exposed Pad
16-Lead Plastic MSOP with Exposed Pad
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 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/.
Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
2
3509fd
For more information
www.linear.com/LT3509
LT3509
elecTrical characTerisTics
PARAMETER
V
IN
Undervoltage Lockout
V
IN
Overvoltage Lockout
Input Quiescent Current
Input Shutdown Current
Feedback Pin Voltage
Reference Voltage Line Regulation
RUN/SS Shutdown Threshold
RUN/SS Voltage for Full I
OUT
RUN/SS Pin Pull-up Current
Feedback Pin Bias Current (Note 4)
Switch Current Limit
DA Comparator Current Threshold
Boost Pin Current
Switch Leakage Current
Switch Saturation Voltage
Minumum Boost Voltage above Switch
Boost Diode Forward Voltage
Boost Diode Leakage
Switching Frequency
I
SW
= 0.9A (Note 5)
I
SW
= 0.9A
I
BD
= 20mA
V
R
= 30V
R
T
= 40.2kΩ
R
T
= 180kΩ
R
T
= 14.1kΩ
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C, V
IN
= 12V. (Note 3)
CONDITIONS
MIN
37
Not Switching V
FB
> 0.8V
V(RUN/SS[1,2]) < 0.3V
l
TYP
3.3
38.5
1.9
9
MAX
3.6
40
2.2
15
0.816
0.8
2
1.3
500
1.9
1.2
36
1.0
2.2
0.9
5
1.08
290
2.5
150
UNITS
V
V
mA
µA
V
%/V
V
V
µA
nA
A
A
mA
µA
V
V
V
µA
MHz
kHz
MHz
V
ns
0.784
0.4
0.7
0.8
0.01
0.6
1
90
1.4
0.95
22
0.01
0.32
1.5
0.7
0.1
3.6V < V
IN
< 36V
V
FB
= 0.8V
l
l
1.05
0.7
I
SW
= 0.9A
0.92
237
2.0
1.0
260
2.15
1.0
80
Sync Pin Input Threshold
Switch Minimum Off-Time
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.
Absolute Maximum Voltage at the V
IN
pin is 60V for non-repetitive
1 second transients and 36V for continuous operation.
Note 3.
The LT3509E is guaranteed to meet performance specifications from
0°C to 125°C junction temperature. Specifications over the –40°C to 125°C
operating junction temperature range are assured by design, characterization
and correlation with statistical process controls. The LT3509I is guaranteed
over the full –40°C to 125°C temperature range. The LT3509H is guaranteed
l
over the full –40°C to 150°C operating junction temperature range. High
junction temperatures degrade operating lifetimes. Operating lifetime is
derated at junction temperatures greater than 125°C.
Note 4.
Current flows out of pin.
Note 5.
Switch Saturation Voltage is guaranteed by design.
Note 6.
This IC includes overtemperature protection that is intended to protect
the device during momentary overload conditions. Junction temperature will
exceed the maximum operating temperature when overtemperature protection
is active. Continuous operation above the specified maximum operating
junction temperature may impair device reliability.
嵌入式系统
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