PGND, GNDK to GND .............................................±0.5V
Operating Ambient Temperature Range
(Notes 3, 4) ............................................ –40°C to 125°C
Maximum Junction Temperature .......................... 125°C
Storage Temperature Range .................. –65°C to 150°C
(Note 1)
pin conFiguraTion
TOP VIEW
DIM/SS
VMODE
CTRL
PWM
V
REF
RT
36 35 34 33 32 31 30
SYNC 1
EN/UVLO 2
INTV
CC
3
GND 4
V
IN
6
SW 8
SW 9
NC 10
12 13 14 15 16 17
PGND
PGND
PGND
PGND
PGND
GNDK
38
SW
37
GND
28 ISP
27 ISN
25 FB
24 GND
23 PWMOUT
21 SW
20 SW
UHE PACKAGE
36-LEAD (5mm
×
6mm) PLASTIC QFN
T
JMAX
= 125°C,
θ
JA
= 34°C/W,
θ
JC
= 3°C/W
EXPOSED PAD (PIN 37) IS GND, MUST BE SOLDERED TO GND PLANE
EXPOSED PAD (PIN 38) IS SW, MUST BE SOLDERED TO SW PLANE
orDer inFormaTion
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LT3955EUHE#PBF
LT3955EUHE#TRPBF
3955
36-Lead (5mm
×
6mm) Plastic QFN
–40°C to 125°C
LT3955IUHE#PBF
LT3955IUHE#TRPBF
3955
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.
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/
V
C
2
3955fb
For more information
www.linear.com/LT3955
LT3955
elecTrical characTerisTics
PARAMETER
V
IN
Minimum Operating Voltage
V
IN
Shutdown I
Q
V
IN
Operating I
Q
(Not Switching)
V
REF
Voltage
V
REF
Line Regulation
V
REF
Pull-Up Current
SW Pin Current Limit
SW Pin Leakage
SW Pin Voltage Drop
DIM/SS Pull-Up Current
DIM/SS Voltage Clamp
Error Amplifier
Full-Scale ISP/ISN Current Sense Threshold
(V
ISP–ISN
)
1/10th Scale ISP/ISN Current Sense Threshold
(V
ISP–ISN
)
Mid-Scale ISP/ISN Current Sense Threshold
(V
ISP–ISN
)
ISP/ISN Overcurrent Threshold
ISP/ISN Current Sense Amplifier Input Common Mode
Range (V
ISN
)
ISP/ISN Input Bias Current High Side Sensing (Combined) PWM = 5V (Active), ISP = ISN = 48V
PWM = 0V (Standby), ISP = ISN = 48V
ISP/ISN Input Bias Current Low Side Sensing (Combined) PWM = 5V, ISP = ISN = 0V
ISP/ISN Current Sense Amplifier g
m
(High Side Sensing)
ISP/ISN Current Sense Amplifier g
m
(Low Side Sensing)
CTRL Pin Range for Linear Current Sense Threshold
Adjustment
CTRL Input Bias Current
V
C
Output Impedance
V
C
Standby Input Bias Current
FB Regulation Voltage (V
FB
)
FB Amplifier g
m
FB Pin Input Bias Current
FB Open LED Threshold
C/10 Inhibit for
VMODE
Assertion (V
ISP–ISN
)
FB Overvoltage Threshold
Oscillator
Switching Frequency
SW Minimum Off-Time
SW Minimum On-Time
SYNC Input Low
R
T
= 95.3kΩ
R
T
= 8.87kΩ
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
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