LT3988E ............................................ –40°C to 125°C
LT3988I ............................................. –40°C to 125°C
LT3988H ............................................ –40°C to 150°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................... 300°C
17
GND
MSE PACKAGE
16-LEAD PLASTIC MSOP
θ
JA
= 40°C/W,
θ
JC
= 10°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
orDer inForMaTion
LEAD FREE FINISH
LT3988EMSE#PBF
LT3988IMSE#PBF
LT3988HMSE#PBF
TAPE AND REEL
LT3988EMSE#TRPBF
LT3988IMSE#TRPBF
LT3988HMSE#TRPBF
PART MARKING
3988
3988
3988
PACKAGE DESCRIPTION
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
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/
elecTrical characTerisTics
PARAMETER
V
IN1
Undervoltage Lockout (Note 3)
V
IN1
Undervoltage Lockout Hysteresis
V
IN1
Overvoltage Lockout (Note 3)
V
IN1
Overvoltage Lockout Hysteresis
V
IN2
Undervoltage Lockout (Note 3)
V
IN2
Undervoltage Lockout Hysteresis
EN/UVLO Input Current
EN/UVLO Enable Threshold
EN/UVLO Undervoltage Threshold
EN/UVLO Undervoltage Threshold Hysteresis
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN1/2
= 12V, unless otherwise noted. (Notes 2, 5, 6)
CONDITIONS
V
IN1
Rising
V
IN1
Rising
V
IN2
Rising, V
IN1
= 4.1V
V
EN/UVLO
= 1.2V
V
EN/UVLO
= Rising
l
l
MIN
TYP
3.9
260
MAX
4.1
66
3.1
0.5
UNITS
V
mV
V
V
V
mV
µA
mV
V
mV
l
60
2
–0.5
300
1.1
64
2.1
2.6
135
500
1.2
120
l
1.3
3988f
2
LT3988
elecTrical characTerisTics
PARAMETER
V
IN1
Quiescent Current
V
IN1
Quiescent Current
V
IN2
Quiescent Current
BD Pin Current
BD Pin Quiescent Current
Shutdown Current (I
VIN1
+I
VIN2
)
FB Voltage
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN1
/V
IN2
= 12V, unless otherwise noted. (Notes 2, 5, 6)
CONDITIONS
V
FB1
= 0.9V, V
BD
= 0V
V
FB1
= 0.9V, V
BD
= 5V
V
FB2
= 0.9V, V
BD
= 5V
V
BD
= 0V
V
BD
= 5V
V
EN/UVLO
≤ 0.3V
0.74
0.735
MIN
TYP
2.7
1.6
250
–8
1.1
0.1
0.75
0.75
–5
0.01
l
MAX
4.5
3
1000
–30
2.2
1
0.76
0.765
–100
1.1
UNITS
mA
mA
µA
µA
mA
µA
V
V
nA
%/V
MHz
kHz
MHz
FB Pin Bias Current
FB Line Voltage Regulation
Switching Frequency
Switching Frequency
Switching Frequency
Switching Phase, SW1 to SW2
DA Comparator Current Threshold
Switch V
SAT
Switch Current Limit (Note 4)
Switch Leakage Current
Minimum Boost Voltage
Boost Pin Current
Boost Diode Forward Voltage
Boost Diode Leakage Current
TRACK/SS Pin Current
SYNC Input High Voltage
SYNC Input Low Voltage
SYNC Input Frequency
SYNC Pin Input Current
V
FB
= 0.75V
5V < V
IN
< 60V
R
T
= 40.2k
R
T
= 200k
R
T
= 14.7k
R
T
= 40.2k
l
0.9
1
250
2.15
150
l
180
1.32
850
1.87
0.01
2
210
1.58
2.25
1
2.5
50
0.9
5
–2.2
0.4
Deg
A
mV
A
µA
V
mA
V
µA
µA
V
V
MHz
µA
1.1
1.4
I
SW
= 1A
Duty Cycle = 35%
I
SW
= 1A
I
BD
= 50mA
V
R
= 5V
V
TRACK/SS
= 1V
V
IH
V
IL
V
SYNC
= 1.5V
l
l
20
0.7
0.1
–0.8
1.5
0.25
0.3
–1.3
2.5
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 LT3988E 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
LT3988I is guaranteed over the full –40°C to 125°C operating junction
temperature range. The LT3988H is 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.
Note 3:
Undervoltage lockout occurs when V
IN
is lower than the
undervoltage threshold. Overvoltage lockout occurs when V
IN
exceeds the
threshold voltage. See Applications Information.
Note 4:
Current limit is guaranteed by design and/or correlation to static
test. Slope compensation reduces current at higher duty cycles.
Note 5:
Polarity specification for all currents into pins is positive. All
voltages are referenced to GND unless otherwise specified.
Note 6:
This IC 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 maximum operating junction temperature may impair device
reliability.
Note 7:
Absolute Maximum Voltage at V
IN
and EN/UVLO is 80V for
nonrepetitive 1 second transients, and 60V for continuous operation.
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