LT3790E/LT3790I .............................. –40°C to 125°C
LT3790H ............................................ –40°C to 150°C
LT3790MP ......................................... –55°C to 150°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................... 300°C
IVINP 10
IVINN 11
V
IN
12
INTV
CC
13
TG1 14
BST1 15
SW1 16
PGND 17
BG1 18
BG2 19
FE PACKAGE
38-LEAD PLASTIC TSSOP
θ
JA
= 28°C/W
EXPOSED PAD (PIN 39) IS SGND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LT3790EFE#PBF
LT3790IFE#PBF
LT3790HFE#PBF
LT3790MPFE#PBF
TAPE AND REEL
LT3790EFE#TRPBF
LT3790IFE#TRPBF
LT3790HFE#TRPBF
LT3790MPFE#TRPBF
PART MARKING*
LT3790FE
LT3790FE
LT3790FE
LT3790FE
PACKAGE DESCRIPTION
38-Lead Plastic TSSOP
38-Lead Plastic TSSOP
38-Lead Plastic TSSOP
38-Lead Plastic TSSOP
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/.
Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
ELECTRICAL CHARACTERISTICS
PARAMETER
Input
V
IN
Operating Voltage
V
IN
Shutdown I
Q
V
IN
Operating I
Q
(Not Switching)
The
l
denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at T
A
= 25°C (Note 2). V
IN
= 12V, V
EN/UVLO
= 12V unless otherwise noted.
CONDITIONS
MIN
4.7
V
EN/UVLO
= 0V
FB = 1.3V, R
T
= 59.0k
0.1
3.0
TYP
MAX
60
1
4
UNITS
V
µA
mA
3790fa
2
For more information
www.linear.com/LT3790
LT3790
ELECTRICAL CHARACTERISTICS
PARAMETER
Logic Inputs
EN/UVLO Falling Threshold
EN/UVLO Rising Hysteresis
EN/UVLO Input Low Voltage
EN/UVLO Pin Bias Current Low
EN/UVLO Pin Bias Current High
CCM Threshold Voltage
CTRL Input Bias Current
CTRL Latch-Off Threshold
CTRL Latch-Off Hysteresis
OVLO Rising Shutdown Voltage
OVLO Falling Hysteresis
Regulation
V
REF
Voltage
V
REF
Line Regulation
V
(ISP-ISN)
Threshold
4.7V < V
IN
< 60V
V
CTRL
= 2V, V
ISP
= 12V/0.1V
l
l
l
l
The
l
denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at T
A
= 25°C (Note 2). V
IN
= 12V, V
EN/UVLO
= 12V unless otherwise noted.
CONDITIONS
MIN
1.16
TYP
1.2
15
I
VIN
Drops Below 1µA
V
EN/UVLO
= 1V
V
EN/UVLO
= 1.6V
0.3
V
CTRL
= 1V
Rising
45
2.85
20
50
13
3
75
1.96
58
56
48
46
28
26
1
0.2
2.00
0.002
60
60
50
50
30
30
4.2
4.2
110
20
0
1650
V
(ISP-ISN)
= 60mV
3V ≤ V
IVINP
≤ 60V
V
IVINP
= V
IVINN
= 12V
V
IVINP
= V
IVINN
= 12V
3
2.12
V
(IVINP-IVINN)
= 50mV
l
l
l
l
MAX
1.24
0.3
UNITS
V
mV
V
µA
nA
V
nA
mV
mV
V
mV
2
3
10
4
100
1.5
50
55
3.15
2.04
0.04
62
64
52
54
32
34
7.4
8.2
V
%/V
mV
mV
mV
mV
mV
mV
mV
mV
µA
µA
V
CTRL
= 1V, V
ISP
= 12V/0.1V
l
V
CTRL
= 600mV, V
ISP
= 12V/0.1V
l
V
CTRL
= 100mV, V
ISP
= 12V/0.1V
l
ISP Bias Current
ISN Bias Current
Output Current Sense Common Mode Range
Output Current Sense Amplifier g
m
ISMON Monitor Voltage
Input Current Sense Threshold V
(IVINP-IVINN)
IVINP Bias Current
IVINN Bias Current
Input Current Sense Common Mode Range
Input Current Sense Amplifier g
m
IVINMON Monitor Voltage
FB Regulation Voltage
FB Line Regulation
FB Amplifier g
m
FB Pin Input Bias Current
V
C
Standby Input Bias Current
V
SENSE(MAX)
(V
SNSP-SNSN
)
Fault
SS Pull-Up Current
SS Discharge Current
V
ISP
= 12V, V
ISN
= 11.9V
V
ISP
= 12V, V
ISN
= 11.9V
60
1.2
50
90
20
60
1
1.2
1.2
0.002
565
100
1.04
1.206
1.220
0.025
200
20
51
–47.5
14
1.4
60
–39
1.26
54
V
µS
V
mV
µA
µA
V
mS
V
V
V
%/V
µS
nA
nA
mV
mV
µA
µA
3790fa
1.14
46.5
0.96
1.194
1.176
4.7V < V
IN
< 60V
FB in Regulation
PWM = 0V
Boost
Buck
V
SS
= 0V
l
l
–20
42
–56
For more information
www.linear.com/LT3790
3
LT3790
ELECTRICAL CHARACTERISTICS
PARAMETER
C/10
Falling Threshold (V
(ISP-ISN)
)
SHORT
Falling Threshold (V
FB
)
C/10
Pin Output Impedance
SHORT
Pin Output Impedance
SS Latch-Off Threshold
SS Reset Threshold
Oscillator
Switching Frequency
R
T
= 147k
R
T
= 59.0k
R
T
= 29.1k
190
380
665
200
90
0.3
4.8
I
INTVCC
= –10mA, V
IN
= 5V
3.1
V
INTVCC
= 4V
0.3
90
10
5
V
BST
– V
SW
= 5V
V
INTVCC
= 5V
C
L
= 3300pF
C
L
= 3300pF
R
T
= 59.0k
20
10
5
240
3.5
67
1.5
1.5
5.2
350
3.9
200
400
700
210
420
735
700
kHz
kHz
kHz
kHz
kΩ
V
V
mV
V
mA
V
kΩ
Ω
Ω
V
FB
= 1.2V
The
l
denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at T
A
= 25°C (Note 2). V
IN
= 12V, V
EN/UVLO
= 12V unless otherwise noted.
CONDITIONS
MIN
1
380
TYP
5
400
1.1
1.1
1.75
0.2
MAX
9
450
2.0
2.0
UNITS
mV
mV
kΩ
kΩ
V
V
SYNC Frequency
SYNC Pin Resistance to GND
SYNC Threshold Voltage
Internal V
CC
Regulator
INTV
CC
Regulation Voltage
Dropout (V
IN
– INTV
CC
)
INTV
CC
Undervoltage Lockout
INTV
CC
Current Limit
PWM
PWM Threshold Voltage
PWM Pin Resistance to GND
PWMOUT Pull-Up Resistance
PWMOUT Pull-Down Resistance
NMOS Drivers
TG1, TG2 Gate Driver On-Resistance
Gate Pull-Up
Gate Pull-Down
BG1, BG2 Gate Driver On-Resistance
Gate Pull-Up
Gate Pull-Down
TG Off to BG On Delay
BG Off to TG On Delay
TG1, TG2, t
OFF(MIN)
2.6
1.7
3
1.2
60
60
240
320
Ω
Ω
Ω
Ω
ns
ns
ns
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 LT3790E is guaranteed to meet performance from 0°C
to 125°C junction temperature. Specification over the -40°C to
125°C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls.
The LT3790I is guaranteed to meet performance specifications over the
–40°C to 125°C operating junction temperature range. The LT3790H is
guaranteed to meet performance specifications over the –40°C to 150°C
operating junction temperature range. The LT3790MP is guaranteed to
meet performance specifications over the –55°C to 150°C operating
junction temperature range. High junction temperatures degrade operating
lifetimes. Operating lifetime is derated for junction temperatures greater
than 125°C.
Note 3:
The LT3790 includes 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 absolute maximum operating junction temperature may
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