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
GNDK
PGND
PGND
PGND
PGND
PGND
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
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
LT3954EUHE#PBF
LT3954IUHE#PBF
TAPE AND REEL
LT3954EUHE#TRPBF
LT3954IUHE#TRPBF
PART MARKING*
3954
3954
PACKAGE DESCRIPTION
36-Lead (5mm
×
6mm) Plastic QFN
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
36-Lead (5mm
×
6mm) Plastic QFN
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
3954f
2
For more information
www.linear.com/3954
LT3954
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)
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
SYNC Input High
1.5
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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Embedded System
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