RUN Pin (Note 2) ......................................................60V
Operating Junction Temperature Range (Note 3)
LT3663E ............................................. –40°C to 125°C
LT3663I .............................................. –40°C to 125°C
LT3663H ............................................ –40°C to 150°C
Storage Temperature.............................. –65°C to 150°C
pin conFiguraTion
LT3663
V
IN
1
RUN 2
FB 3
I
LIM
4
9
GND
TOP VIEW
8 SW
7 BOOST
6 I
SENSE
5 V
OUT
LT3663-X
V
IN
1
RUN 2
V
OUTS
3
I
LIM
4
9
GND
TOP VIEW
8 SW
7 BOOST
6 I
SENSE
5 V
OUT
DCB PACKAGE
8-LEAD (2mm
×
3mm) PLASTIC DFN
θ
JA
= 64°C/W
EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB
LT3663
V
IN
RUN
FB
I
LIM
1
2
3
4
TOP VIEW
9
GND
8
7
6
5
SW
BOOST
I
SENSE
V
OUT
LT3663-X
DCB PACKAGE
8-LEAD (2mm
×
3mm) PLASTIC DFN
θ
JA
= 64°C/W
EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB
TOP VIEW
V
IN
1
RUN 2
V
OUTS
3
I
LIM
4
9
GND
8
7
6
5
SW
BOOST
I
SENSE
V
OUT
MSE PACKAGE
8-LEAD PLASTIC MSOP
θ
JA
= 35°C/W
EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB
MSE PACKAGE
8-LEAD PLASTIC MSOP
θ
JA
= 35°C/W
EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB
orDer inForMaTion
LEAD FREE FINISH
LT3663EDCB#PBF
LT3663IDCB#PBF
LT3663EDCB-3.3#PBF
LT3663IDCB-3.3#PBF
LT3663EDCB-5#PBF
LT3663IDCB-5#PBF
LT3663EMS8E#PBF
LT3663IMS8E#PBF
LT3663HMS8E#PBF
LT3663EMS8E-3.3#PBF
LT3663IMS8E-3.3#PBF
LT3663HMS8E-3.3#PBF
LT3663EMS8E-5#PBF
TAPE AND REEL
LT3663EDCB#TRPBF
LT3663IDCB#TRPBF
LT3663EDCB-3.3#TRPBF
LT3663IDCB-3.3#TRPBF
LT3663EDCB-5#TRPBF
LT3663IDCB-5#TRPBF
LT3663EMS8E#TRPBF
LT3663IMS8E#TRPBF
LT3663HMS8E#TRPBF
PART MARKING*
LDVK
LDVK
LFMW
LFMW
LFMY
LFMY
LTDWT
LTDWT
LTDWT
PACKAGE DESCRIPTION
8-Lead (2mm
×
3mm) Plastic DFN
8-Lead (2mm
×
3mm) Plastic DFN
8-Lead (2mm
×
3mm) Plastic DFN
8-Lead (2mm
×
3mm) Plastic DFN
8-Lead (2mm
×
3mm) Plastic DFN
8-Lead (2mm
×
3mm) Plastic DFN
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead 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 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 150°C
–40°C to 125°C
–40°C to 125°C
–40°C to 150°C
–40°C to 125°C
3663fc
LT3663EMS8E-3.3#TRPBF LTFMX
LT3663IMS8E-3.3#TRPBF LTFMX
LT3663HMS8E-3.3#TRPBF LTFMX
LT3663EMS8E-5#TRPBF
LTFMZ
2
For more information
www.linear.com/LT3663
LT3663
orDer inForMaTion
LEAD FREE FINISH
LT3663IMS8E-5#PBF
LT3663HMS8E-5#PBF
TAPE AND REEL
LT3663IMS8E-5#TRPBF
LT3663HMS8E-5#TRPBF
PART MARKING*
LTFMZ
LTFMZ
PACKAGE DESCRIPTION
8-Lead Plastic MSOP
8-Lead Plastic MSOP
TEMPERATURE RANGE
–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
IN
Undervoltage Lockout
V
IN
Undervoltage Lockout Hysteresis
V
IN
Overvoltage Lockout
V
IN
Overvoltage Lockout Hysteresis
V
IN
Supply Current
V
IN
Supply Current in Shutdown
Run Input Voltage High
Run Input Voltage Low
Run Pin Bias Current
V
OUT
Current Limit Range
V
OUT
Current Limit
Operating Frequency
Maximum Duty Cycle
Feedback Voltage
FB Bias Current
Regulated Output Voltage
V
OUTS
Bias Current
Switch Peak Current Limit
Switch V
CESAT
Minimum BOOST Voltage
Boost Diode Drop
Boost Pin Current
LT3663
Rising
Rising
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 12V, R
ILIM
= 36.5k unless otherwise noted.
CONDITIONS
l
MIN
TYP
7
500
MAX
7.5
41
3.2
2
0.3
UNITS
V
mV
V
V
mA
µA
V
V
µA
µA
A
A
kHz
kHz
%
mV
nA
V
V
µA
A
mV
V
V
mA
l
36
39
1
2.4
0.01
Not Switching
V
RUN
= 0V
2.5
V
RUN
= 2.3V (Note4)
V
RUN
= 0V
l
l
6
0.01
0.4
0.8
1350
900
l
l
15
0.1
1.2
1.2
1650
1100
816
150
3.366
5.100
120
2.5
2.2
1.2
1
1500
1000
92
800
50
3.3
5
90
2
275
1.85
0.9
28
LT3663
LT3663-X
80
784
3.234
4.900
1.6
V
FB
= 0.8V, LT3663
LT3663-3.3
LT3663-5
LT3663-X
(Note 5)
I
SW
= 1A
I
SW
= 1A (Note 6)
I
DIODE
= 60mA
I
SW
= 1A
l
l
l
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:
Absolute Maximum Voltage at V
IN
and RUN pins is 60V for
nonrepetitive 1 second transients.
Note 3:
The LT3663E is guaranteed to meet performance specifications
from 0°C to 125°C. Specifications over the –40°C to 125°C operating
temperature range are assured by design, characterization, and
correlation with statistical process controls. The LT3663I specifications
are guaranteed over the full –40°C to 125°C temperature range. The
LT3663H specifications are guaranteed over the –40°C to 150°C operating
temperature range. High junction temperatures degrade operating
lifetimes. Operating lifetime is derated at junction temperatures greater
than 125°C.
Note 4:
Current flows into pin.
Note 5:
Switch Peak Current Limit guaranteed by design and/or correlation
to static test.
Note 6:
This is the minimum voltage across the boost capacitor needed to
guarantee full saturation of the switch.
3663fc
For more information For more information
www.linear.com/LT3663
3
LT3663
Typical perForMance characTerisTics
V
IN
Undervoltage Lockout
8.0
7.5
7.0
INPUT VOLTAGE (V)
6.5
6.0
5.5
5.0
4.5
4.0
–50 –25
0
25 50 75 100 125 150
TEMPERATURE (°C)
3663 G03
T
A
= 25°C, unless otherwise noted.
V
IN
Overvoltage Lockout
42
41
800
700
V
IN
Shutdown Current
V
RUN
= 0V
RISING
INPUT VOLTAGE (V)
40
39
38
37
36
35
34
33
32
–50 –25
0
RISING
V
IN
CURRENT (µA)
600
500
400
300
200
100
FALLING
FALLING
25 50 75 100 125 150
TEMPERATURE (°C)
3663 G06
0
0
10
20
30
40
V
IN
VOLTAGE (V)
50
60
3663 G08
RUN Pin Current
45
40
OUTPUT CURRENT LIMIT (A)
RUN PIN CURRENT (µA)
35
30
25
20
15
10
5
0
0
10
20
30
40
RUN PIN VOLTAGE (V)
50
60
3663 G11
Output Current Limit
1.20
1.15
OUTPUT VOLTAGE (V)
1.10
1.05
1.00
0.95
0.90
0.85
0.80
–50 –25
0
25 50 75 100 125 150
TEMPERATURE (°C)
3663 G04
Output Current Limit
6
R
ILIM
= 28.7k
5
4
3
2
1
0
R
ILIM
= 36.5k
0
0.2
0.4 0.6 0.8
1
OUTPUT CURRENT (A)
1.2
1.4
3663 G12
Switching Frequency
1.6
MINIMUM SWITCH-ON TIME (ns)
SWITCHING FREQUENCY (MHz)
1.5
LT3663
1.4
1.3
1.2
1.1
1.0
0.9
–50 –25
0
LT3663-X
140
120
100
80
60
40
20
Minimum Switch On-Time
0.84
Feedback Voltage
FEEDBACK VOLTAGE (V)
0
25 50 75 100 125 150
TEMPERATURE (°C)
3663 G10
0.82
0.80
0.78
25 50 75 100 125 150
TEMPERATURE (°C)
3663 G02
0
–50 –25
0.76
–50 –25
0
25 50 75 100 125 150
TEMPERATURE (°C)
3663 G05
4
3663fc
For more information
www.linear.com/LT3663
LT3663
Typical perForMance characTerisTics
Switch Voltage Drop
400
350
SWITCH VOLTAGE DROP (mV)
BOOST DIODE V
F
(V)
300
250
200
150
100
50
0
0
0.2
0.4
0.6
0.8
SWITCH CURRENT (A)
1
1.2
3663 G01
T
A
= 25°C, unless otherwise noted.
125°C
25°C
1.4
1.2
1
0.8
0.6
0.4
0.2
0
Boost Diode V
f
BOOST Pin Current
35
30
BOOST PIN CURRENT (mA)
25
20
15
10
5
–45°C
0
50
100
150
200
250
DIODE CURRENT (mA)
300
3653 G09
0
0
0.2
0.4
0.5
0.8
SWITCH CURRENT (A)
1.0
1.2
3653 G07
pin FuncTions
BOOST:
The BOOST pin is used to provide a drive voltage,
higher than the input voltage, to the internal power switch.
The BOOST pin is also internally connected to the cathode
of the BOOST diode.
GND (Exposed Pad Pin 9) :
Ground. The exposed pad
must be soldered to the PCB and electrically connected
to ground. Use a large ground plane and thermal vias to
optimize thermal performance.
FB (LT3663):
The LT3663 regulates the FB pin to 0.8V.
Connect the feedback resistor divider tap to this pin.
I
LIM
:
Output Current Limit Program Pin. Connect a resistor
to ground to program the regulator output current limit.
I
SENSE
:
The I
SENSE
pin is the positive input to the internal
output current limit sense resistor. The I
SENSE
pin is also
the anode to the internal BOOST diode.
RUN:
The Run pin is used to put the LT3663 into shutdown
mode. Tie to ground to shut down the LT3663. Tie to 2.5V
or more for normal operation. If the shutdown feature is
not used, connect this pin to V
IN
.
SW:
The SW pin is the output of the internal power switch.
Connect this pin to the inductor, catch diode and boost
capacitor.
V
IN
:
The V
IN
pin supplies current to the LT3663’s internal
regulator and internal power switch. Capacitively bypass
the pin to ground.
V
OUT
:
The V
OUT
pin is connected to the negative terminal
of the internal output current limit sense resistor.
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