LT3956 View Datasheet(PDF) - Linear Technology
Part Name
Description
Manufacturer
LT3956 Datasheet PDF : 20 Pages
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LT3956
Absolute Maximum Ratings
(Note 1)
VIN, ISP, ISN...............................................................80V
SW.............................................................................84V
EN/UVLO (Note 3).....................................................80V
INTVCC....................................................... VIN + 0.3V, 8V
PWMOUT...................................................INTVCC + 0.3V
CTRL, PWM, VMODE.................................................12V
FB ................................................................................8V
VC, VREF , SS................................................................3V
RT.............................................................................1.5V
PGND to GND.........................................................±0.5V
Operating Junction Temperature Range
(Note 2).............................................. –40°C to 125°C
Maximum Junction Temperature........................... 125°C
Storage Temperature Range................... –65°C to 125°C
Lead Temperature (Soldering, 10 sec)................... 300°C
Pin Configuration
TOP VIEW
36 35 34 33 32 31 30
NC 1
EN/UVLO 2
INTVCC 3
37
GND 4
GND
VIN 6
SW 8
SW 9
NC 10
38
SW
12 13 14 15 16 17
28 ISP
27 ISN
25 FB
24 GND
23 PWMOUT
21 SW
20 SW
UHE PACKAGE
36-LEAD (5mm s 6mm) PLASTIC QFN
TJMAX = 125°C, θJA = 43°C/W, θJC = 5°C/W
EXPOSED PAD (PIN 37) IS GND, MUST BE SOLDERED TO PCB
EXPOSED PAD (PIN 38) IS SW, MUST BE SOLDERED TO PCB
order information
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LT3956EUHE#PBF
LT3956EUHE#TRPBF
3956
36-Lead (5mm × 6mm) Plastic QFN –40°C to 125°C
LT3956IUHE#PBF
LT3956IUHE#TRPBF
3956
36-Lead (5mm × 6mm) Plastic QFN –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.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
This product is only offered in trays. For more information go to: http://www.linear.com/packaging/
Electrical Characteristics The l denotes the specifications which apply over the full operating temp-
erature range, otherwise specifications are at TA = 25°C. VIN = 24V, EN/UVLO = 24V, CTRL = 2V, PWM = 5V, unless otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP MAX UNITS
VIN Minimum Operating Voltage
VIN Tied to INTVCC
l
4.5
V
VIN Shutdown IQ
EN/UVLO = 0V
EN/UVLO = 1.15V
0.1
1
µA
5
µA
VIN Operating IQ (Not Switching)
PWM = 0V
1.4
1.7
mA
VREF Voltage
VREF Line Regulation
–100µA ≤ IVREF ≤ 0µA
4.5V ≤ VIN ≤ 80V
l 1.965
2.00 2.045
V
0.006
%/V
3956f
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