SENSE ....................................................................±0.3V
FBX ................................................................. –6V to 6V
Operating Junction Temperature Range (Notes 2, 8)
LT3758E/LT3758AE ........................... –40°C to 125°C
LT3758I/LT3758AI ............................. –40°C to 125°C
LT3758H/LT3758AH .......................... –40°C to 150°C
LT3758MP/LT3758AMP ..................... –55°C to 150°C
Storage Temperature Range
DFN.................................................... –65°C to 125°C
MSOP ................................................ –65°C to 150°C
Lead Temperature (Soldering, 10 sec) MSOP........ 300°C
PIN CONFIGURATION
TOP VIEW
V
C
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
V
C
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
= 150°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
LT3758HMSE#PBF
LT3758MPMSE #PBF
LT3758AEDD#PBF
LT3758AIDD#PBF
LT3758AEMSE#PBF
LT3758AIMSE#PBF
LT3758AHMSE#PBF
LT3758AMPMSE#PBF
TAPE AND REEL
LT3758EDD#TRPBF
LT3758IDD#TRPBF
LT3758EMSE#TRPBF
LT3758IMSE#TRPBF
LT3758HMSE#TRPBF
LT3758MPMSE#TRPBF
LT3758AEDD#TRPBF
LT3758AIDD#TRPBF
LT3758AEMSE#TRPBF
LT3758AIMSE#TRPBF
LT3758AHMSE#TRPBF
LT3758AMPMSE#TRPBF
PART MARKING*
LDNK
LDNK
LTDNM
LTDNM
LTDNM
LTDNM
LGGS
LGGS
LTGGK
LTGGK
LTGGK
LTGGK
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
10-Lead (3mm
×
3mm) Plastic MSOP
10-Lead (3mm
×
3mm) Plastic MSOP
10-Lead (3mm
×
3mm) Plastic DFN
10-Lead (3mm
×
3mm) Plastic DFN
10-Lead (3mm
×
3mm) Plastic MSOP
10-Lead (3mm
×
3mm) Plastic MSOP
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
–40°C to 150°C
–55°C to 150°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 150°C
–55°C to 150°C
Contact the factory for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Tape and reel specifications.
Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix.
Rev F
2
For more information
www.analog.com
LT3758/LT3758A
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
(∆I
VC
/∆FBX)
V
C
Output Impedance
V
FBX
Line Regulation (∆V
FBX
/[∆V
IN
• V
FBX(REG)
])
V
C
Current Mode Gain (∆V
VC
/∆V
SENSE
)
V
C
Source Current
V
C
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
temperature 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
V
C
= 0.3V, R
T
= 41.2k
V
C
= 0.3V, R
T
= 41.2k, INTV
CC
= 7.5V
l
MIN
5.5
TYP
0.1
1.75
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)
V
C
= 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 (∆V
INTVCC
/ V
INTVCC
)
INTV
CC
Line Regulation (∆V
INTVCC
/ [∆V
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
Rev F
For more information
www.analog.com
3
LT3758/LT3758A
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/LT3758AE are 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 LT3758I/LT3758AI are guaranteed over the full –40°C to
125°C operating junction temperature range. The LT3758H/LT3758AH are
guaranteed over the full –40°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. The
LT3758MP/LT3758AMP are 100% tested and guaranteed over the full
–55°C to 150°C operating junction temperature range.
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
temperature 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
Note 3:
The LT3758/LT3758A are tested in a feedback loop which servos
V
FBX
to the reference voltages (1.6V and –0.8V) with the V
C
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.
Note 6:
SHDN/UVLO
= 1.33V when V
IN
= 5.5V.
Note 7:
For V
IN
below 6V, the
SHDN/UVLO
pin must not exceed V
IN
.
Note 8:
The LT3758/LT3758A include overtemperature protection that
is intended to protect the device during momentary overload conditions.
Junction temperature will exceed the maximum operating junction
temperature when overtemperature protection is active. Continuous
operation above the specified maximum operating junction temperature
