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LT3956

3956f

absoluTe MaxiMuM raTings

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

(Note 1)

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/

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VIN Minimum Operating Voltage

VIN Tied to INTVCC

4.5

VIN Shutdown IQ

EN/UVLO = 0V

EN/UVLO = 1.15V

0.1

µA

VIN Operating IQ (Not Switching)

PWM = 0V

1.4

1.7

VREF Voltage

–100µA ≤ IVREF ≤ 0µA

1.965

2.00

2.045

VREF Line Regulation

4.5V ≤ VIN ≤ 80V

0.006

%/V

pin conFiguraTion

12 13 14

TOP VIEW

GND

UHE PACKAGE

36-LEAD (5mm 6mm) PLASTIC QFN

15 16 17

36 35 34 33 32 31 30

EN/UVLO

INTVCC

GND

VIN

ISP

ISN

GND

PWMOUT

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

elecTrical characTerisTics The

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.

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