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LT3956
GND 4
25 FB
SW 8
21 SW
ABSOLUTEMAXIMUMRATINGS
(Note 1)
V IN , ISP, ISN ..............................................................80V
SW ............................................................................84V
EN/UVLO (Note 3) .....................................................80V
INTV CC ...................................................... V IN + 0.3V, 8V
PWMOUT ..................................................INTV CC + 0.3V
CTRL, PWM, VMODE ................................................12V
FB ...............................................................................8V
V C , V REF , 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 28 ISP
EN/UVLO 2 27 ISN
INTV CC 3 37
GND
V IN 6 23 PWMOUT
38
SW
SW 9 20 SW
NC 10
12 13 14 15 16 17
UHE PACKAGE
36-LEAD (5mm 6mm) PLASTIC QFN
24 GND
T JMAX = 125°C, θ JA = 43°C/W, θ JC = 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
LT3956EUHE#PBF
LT3956IUHE#PBF
TAPE AND REEL
LT3956EUHE#TRPBF
LT3956IUHE#TRPBF
PART MARKING*
3956
3956
PACKAGE DESCRIPTION
36-Lead (5mm × 6mm) Plastic QFN
36-Lead (5mm × 6mm) Plastic QFN
TEMPERATURE RANGE
–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.
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 T A = 25°C. V IN = 24V, EN/UVLO = 24V, CTRL = 2V, PWM = 5V, unless otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V IN Minimum Operating Voltage
V IN Shutdown I Q
V IN Operating I Q (Not Switching)
V IN Tied to INTV CC
EN/UVLO = 0V
EN/UVLO = 1.15V
PWM = 0V
l
0.1
1.4
4.5
1
5
1.7
V
μA
μA
mA
V REF Voltage
–100μA ≤ I VREF ≤ 0μA
l
1.965
2.00
2.045
V
V REF Line Regulation
4.5V ≤ V IN ≤ 80V
0.006
%/V
3956f
 
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