SENSE ......................................................................0.4V
Operating Junction Temperature Range (Note 2)
LT3748E/LT3748I ............................... –40°C to 125°C
LT3748H ............................................ –40°C to 150°C
LT3748MP ......................................... –55°C to 150°C
Storage Temperature Range .................. –65°C to 150°C
MS PACKAGE
16 (12)-LEAD PLASTIC MSOP
T
JMAX
= 150°C,
θ
JA
= 90°C/W
orDer inForMation
LEAD FREE FINISH
LT3748EMS#PBF
LT3748IMS#PBF
LT3748HMS#PBF
LT3748MPMS#PBF
TAPE AND REEL
LT3748EMS#TRPBF
LT3748IMS#TRPBF
LT3748HMS#TRPBF
LT3748MPMS#TRPBF
PART MARKING*
3748
3748
3748
3748
PACKAGE DESCRIPTION
16-Lead Plastic MSOP
16-Lead Plastic MSOP
16-Lead Plastic MSOP
16-Lead Plastic MSOP
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–40°C to 150°C
–55°C to 150°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/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
electrical characteristics
PARAMETER
Input Voltage Range
Quiescent Current
V
IN
Quiescent Current, INTV
CC
Overdriven
INTV
CC
Voltage Range
INTV
CC
Pin Regulation Voltage
INTV
CC
Dropout
INTV
CC
Undervoltage Lockout
EN/UVLO Pin Threshold
EN/UVLO Pin Hysteresis Current
Soft-Start Current
Soft-Start Threshold
Soft-Start Reset Current
Not Switching
V
EN/UVLO
= 0.2V
V
INTVCC
= 10V
CONDITIONS
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 10V, unless otherwise noted.
MIN
l
TYP
1.3
0
300
MAX
100
1.75
1
450
20
7.2
3.75
1.25
2.9
UNITS
V
mA
µA
µA
V
V
V
V
V
µA
µA
V
mA
5
l
4.5
6.8
7
0.7
3.6
1.223
2.4
5
0.65
3
(V
IN
– V
INTVCC
), I
INTVCC
= 10mA, V
IN
= 5V
Falling Threshold
EN/UVLO Pin Voltage Rising
EN/UVLO = 1V
V
SS
= 0.4V (Note 3)
l
l
3.45
1.19
1.9
2
3748fb
For more information
www.linear.com/LT3748
LT3748
electrical characteristics
PARAMETER
Maximum SENSE Current Limit Threshold
Minimum SENSE Current Limit Threshold
Maximum to Minimum SENSE Threshold
Ratio
SENSE Overcurrent Threshold
SENSE Input Bias Current
R
REF
Voltage
R
REF
Voltage Line Regulation
R
REF
Pin Bias Current
TC Current into R
REF
Error Amplifier Voltage Gain
Error Amplifier Transconductance
V
C
Source Current
V
C
Sink Current
Flyback Comparator Trip Current
Minimum GATE Off-Time
Minimum GATE On-Time
Maximum Discontinuous Off-Time
Maximum GATE Off-Time
Maximum GATE On-Time
GATE Output Rise Time
GATE Output Fall Time
GATE Output Low (V
OL
)
GATE Output High (V
OH
)
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
The LT3748E is guaranteed to meet performance specifications
from 0°C to 125°C junction temperature. Specifications over the –40°C
to 125°C operating junction temperature range are assured by design
characterization and correlation with statistical process controls. The
V
INTVCC
– 0.05
V
C
= 0V
V
RREF
= 0.5V
V
SENSE
= 0V
C
L
= 3300pF, 10% to 90%
C
L
= 3300pF, 10% to 90%
∆I
= 10µA
V
C
= 1.1V, V
RREF
= 0.5V
V
C
= 1.1V, V
RREF
= 2V
Current into R
FB
Pin, R
REF
= 6.04k
V
C
= 2.2V
V
SENSE
= 10mV (Note 3)
V
C
= 1.1V
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 10V, unless otherwise noted.
CONDITIONS
V
C
= 2.2V
l
MIN
95
90
5.2
115
10
1.20
1.195
TYP
100
100
15
6.6
130
15
1.223
0.005
MAX
105
110
8.2
145
20
1.24
1.245
0.025
500
UNITS
mV
mV
mV
mV/mV
mV
µA
V
V
%/V
nA
µA
V/V
µmhos
µA
µA
µA
ns
ns
µs
µs
µs
ns
ns
V
C
= 0V
l
5V < V
IN
< 100V
(Note 3)
R
TC
= 20k
l
35
27.5
115
155
–45
48
10
700
250
24
55
55
16
16
0.05
V
V
LT3748I is guaranteed over the full –40°C to 125°C operating junction
temperature range. The LT3748H is guaranteed over the full –40°C to
150°C operating junction temperature range. The LT3748MP is guaranteed
over the full –55°C to 150°C operating junction temperature range. High
junction temperatures degrade operating lifetimes. Operating lifetime is
derated at junction temperatures greater than 125°C.
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