FBX ................................................................. –6V to 6V
Operating Temperature Range
(Note 2) ............................................. –40°C to 125°C
Maximum Junction Temperature........................... 125°C
Storage Temperature Range................... –65°C to 125°C
PIN CONFIGURATION
TOP VIEW
VC
FBX
SS
RT
SYNC
1
2
3
4
5
11
10 V
IN
9
SHDN/UVLO
8 INTV
CC
7 GATE
6 SENSE
TOP VIEW
VC
FBX
SS
RT
SYNC
1
2
3
4
5
10
9
8
7
6
V
IN
SHDN/UVLO
INTV
CC
GATE
SENSE
11
DD PACKAGE
10-LEAD (3mm 3mm) PLASTIC DFN
T
JMAX
= 125°C,
θ
JA
= 43°C/W
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
MSE PACKAGE
10-LEAD PLASTIC MSOP
T
JMAX
= 125°C,
θ
JA
= 40°C/W
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LT3758EDD#PBF
LT3758IDD#PBF
LT3758EMSE#PBF
LT3758IMSE #PBF
TAPE AND REEL
LT3758EDD#TRPBF
LT3758IDD#TRPBF
LT3758EMSE#TRPBF
LT3758IMSE#TRPBF
PART MARKING*
LDNK
LDNK
LTDNM
LTDNM
PACKAGE DESCRIPTION
10-Lead (3mm
×
3mm) Plastic DFN
10-Lead (3mm
×
3mm) Plastic DFN
10-Lead (3mm
×
3mm) Plastic MSOP
10-Lead (3mm
×
3mm) Plastic MSOP
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–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/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
3758f
2
LT3758
ELECTRICAL CHARACTERISTICS
PARAMETER
V
IN
Operating Range
V
IN
Shutdown I
Q
V
IN
Operating I
Q
V
IN
Operating I
Q
with Internal LDO Disabled
SENSE Current Limit Threshold
SENSE Input Bias Current
Error Amplifier
FBX Regulation Voltage (V
FBX(REG)
)
FBX Overvoltage Lockout
FBX Pin Input Current
Transconductance g
m
(ΔI
VC
/ΔFBX)
VC Output Impedance
V
FBX
Line Regulation (ΔV
FBX
/[ΔV
IN
• V
FBX(REG)
])
VC Current Mode Gain (ΔV
VC
/ΔV
SENSE
)
VC Source Current
VC Sink Current
Oscillator
Switching Frequency
R
T
= 41.2k to GND, FBX = 1.6V
R
T
= 140k to GND, FBX = 1.6V
R
T
= 10.5k to GND, FBX = 1.6V
FBX = 1.6V
270
300
100
1000
1.2
220
220
0.4
1.5
SS = 0V, Current Out of Pin
l
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,
SHDN/UVLO
= 24V, SENSE = 0V, unless otherwise noted.
CONDITIONS
SHDN/UVLO
= 0V
SHDN/UVLO
= 1.15V
VC = 0.3V, R
T
= 41.2k
VC = 0.3V, R
T
= 41.2k, INTV
CC
= 7.5V
l
MIN
5.5
TYP
0.1
1.6
350
MAX
100
1
6
2.2
400
120
UNITS
V
μA
μA
mA
μA
mV
μA
100
110
–65
Current Out of Pin
FBX > 0V (Note 3)
FBX < 0V (Note 3)
FBX > 0V (Note 4)
FBX < 0V (Note 4)
FBX = 1.6V (Note 3)
FBX = –0.8V (Note 3)
(Note 3)
(Note 3)
FBX > 0V, 5.5V < V
IN
< 100V (Notes 3, 6)
FBX < 0V, 5.5V < V
IN
< 100V (Notes 3, 6)
VC = 1.5V
FBX = 1.7V
FBX = –0.85V
l
l
1.569
–0.816
6
7
–10
1.6
–0.800
8
11
70
230
5
0.006
0.005
5.5
–15
12
11
1.631
–0.784
10
14
100
10
V
V
%
%
nA
nA
μS
MΩ
0.025
0.03
%/V
%/V
V/V
μA
μA
μA
330
kHz
kHz
kHz
V
ns
ns
RT Voltage
Minimum Off-Time
Minimum On-Time
SYNC Input Low
SYNC Input High
SS Pull-Up Current
Low Dropout Regulator
INTV
CC
Regulation Voltage
INTV
CC
Undervoltage Lockout Threshold
INTV
CC
Overvoltage Lockout Threshold
INTV
CC
Current Limit
INTV
CC
Load Regulation (ΔV
INTVCC
/ V
INTVCC
)
INTV
CC
Line Regulation (ΔV
INTVCC
/ [ΔV
IN
• V
INTVCC
])
Dropout Voltage (V
IN
– V
INTVCC
)
–10
7
4.3
7.2
4.5
0.5
17.5
16
50
–0.4
0.005
500
0.02
7.4
4.7
μA
V
V
V
V
22
mA
mA
%
%/V
mV
Falling INTV
CC
UVLO Hysteresis
V
IN
= 100V
V
IN
= 20V
0 < I
INTVCC
< 10mA, V
IN
= 8V
8V < V
IN
< 100V
V
IN
= 6V, I
INTVCC
= 10mA
11
–1
3758f
3
LT3758
ELECTRICAL CHARACTERISTICS
PARAMETER
INTV
CC
Current in Shutdown
INTV
CC
Voltage to Bypass Internal LDO
Logic Inputs
SHDN/UVLO
Threshold Voltage Falling
SHDN/UVLO
Input Low Voltage
SHDN/UVLO
Pin Bias Current Low
SHDN/UVLO
Pin Bias Current High
Gate Driver
t
r
Gate Driver Output Rise Time
t
f
Gate Driver 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 LT3758E is guaranteed to meet performance specifications
from the 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
INTV
CC
–0.05
C
L
= 3300pF (Note 5), INTV
CC
= 7.5V
C
L
= 3300pF (Note 5), INTV
CC
= 7.5V
22
20
0.05
ns
ns
V
V
V
IN
= INTV
CC
= 8V
I
VIN
Drops Below 1μA
SHDN/UVLO
= 1.15V
SHDN/UVLO
= 1.33V
1.7
2
10
l
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,
SHDN/UVLO
= 24V, SENSE = 0V, unless otherwise noted.
CONDITIONS
SHDN/UVLO
= 0V, INTV
CC
= 8V
MIN
TYP
16
7.5
1.17
1.22
1.27
0.4
2.5
100
MAX
UNITS
μA
V
V
V
μA
nA
LT3758I is guaranteed over the full –40°C to 125°C operating junction
temperature range.
Note 3:
The LT3758 is tested in a feedback loop which servos V
FBX
to the
reference voltages (1.6V and –0.8V) with the VC pin forced to 1.3V.
Note 4:
FBX overvoltage lockout is measured at V
FBX(OVERVOLTAGE)
relative
to regulated V
FBX(REG)
.
Note 5:
Rise and fall times are measured at 10% and 90% levels.
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